Equipment. Spot Network Equipment Contents

Transcription

1 September Sheet 00 Spot.0- Equpment Contents Dscusson Spot Decson Tree General Descrpton Commercal Spot Desgn Consderatons Protector Equpment Lqud-Type Transformers Dry-Type Transformers CM Protectors Protector NPL Fuses MPCV Relay Communcatons Capabltes MPCV Relay Communcatons Communcatons Confguratons CM Protector Schematc Dsconnect Cabnet Transton Box to Busway Ratng Selecton Selector Gude Protector Applcaton Informaton Layout Dmensons Lqud-Type Unt Dmensons Dry-Type Unt Dmensons Dry-Type Unt Swtchgear Mounted Protector Dmensons Specfcatons See Eaton s Product Specfcaton Gude, avalable on CD or on the Web. CSI Format: Secton Secton CM Protector 0 CA0000E

2 .0- Dscusson Spot Decson Tree September Sheet 00 Contnuty of Servce Crtcal Consderng Spot s for Electrcal Dstrbuton n a Faclty? Contnuty of Servce NOT Crtcal 0 Does the local utlty offer multple crcuts for the metered utlty servce? YES NO Are the multple ncomng crcuts from the utlty n synchronzaton? YES NO Are the multple crcuts from the utlty the same voltage and frequency under most operatng condtons? YES NO Use Radal desgn at one or more servce voltages. Use separate Radal or Double-ended Substatons wth Open Transton Swtchng. Spot s may be possble, but wthout the redundancy of multple prmary crcuts. How many crcuts are avalable or routed to each major load areas of the faclty? One () Two () Three () Four () Spot s may be possble, but wthout the redundancy of multple prmary crcuts. Three Transformer Spot s are practcal. See Pages.0- through.0- for Applcaton nformaton. If antcpated load = Y kva, use three network transformers each rated Y/ kva. Two Transformer Spot s are practcal. See Pages.0- through.0- for Applcaton nformaton. If antcpated load = X kva, use two network transformers each rated X kva. Four Transformer Spot s are practcal. See Pages.0- through.0- for Applcaton nformaton. If antcpated load = Z kva, use four network transformers each rated Z/ kva. Fgure.0-. Spot Decson Tree CA0000E

3 September Sheet 00 Dscusson General Descrpton.0- Descrpton Eaton s Spot Systems are desgned to ensure servce contnuty n /V and 0/V wye connected secondary network systems. These systems, n ether grd or spot network form, are commonly used n areas of hgh load densty such as metropoltan and suburban busness dstrcts or facltes. Suburban loads were formerly almost entrely resdental and power outages caused lttle more than personal nconvenence. Now, the suburban load ncludes not only shoppng plazas, ndustres and resdences, but such vtal facltes as hosptals and arports. For these and other crtcal loads, power nterruptons can have serous consequences to publc and personal safety. Spot networks provde superor relablty at these mportant loads. The need to supply ncreasng amounts of power effcently, wthout ncreasng equpment sze, has resulted n a shft from V to 0V wye systems. The change to a hgher utlzaton voltage requres a commensurate change n operatng procedures because of the dfference n arcng characterstcs at 0V compared to V. For example, whle an arc n a volt system s normally self-extngushng, an arc n a 0V system wll usually burn untl t s nterrupted by an overcurrent devce or untl t totally consumes the arcng materal. Secondary network systems usng Eaton Protectors are among the most dependable n use today. In the event of a fault on a prmary system cable or transformer, the protector opens due to reverse power flow, thus solatng the fault from the network bus and avodng load power dsturbances. Loss of the prmary feeder wll not result n servce outage at the load on the secondary network. The other prmary feeders wll contnue carryng the load untl the faulted cable s repared and returned to servce. The network protector bascally conssts of a specal ar power breaker, a breaker operatng mechansm, network relay(s) and control equpment. Unts are avalable n both weatherproof and submersble enclosures for ether separate or transformer throat mountng. Swtchgear mountng s also possble. Prmary Crcut Transformer Protector Optonal Man, 0/ Relayng and/or Dsconnect LV Feeder Fgure.0-. Typcal Confguraton for Three Transformer Spot Better Contnuty of Servce The largest user of network systems n the Unted States s Consoldated Edson of New York. Hstorcal data developed by ths utlty llustrates that outages are very rare (approxmately zero) on grd systems and that spot network systems are fve tmes more relable than secondary selectve double-ended substaton servces. Improved Regulaton Less Voltage Saggng Each load s suppled from at least two drectons. Servces suppled from a transformer locaton have a mnmum of two paths of supply on utlty grds and spot networks, and can be desgned to have more. Abrupt changes n loads, such as motor startng, cause much less voltage dsturbance due to the multple paths for load current compared to smple radal servces. The voltage dp resultng from a gven startng current may be 0% less n a network system than n a radal system. Less Transformer Capacty Requred Customer Loads Fuses Te NC In normal operaton, the loads along the network servce are dvded among the varous network transformers n such a way that the best possble voltage condtons and lowest losses are realzed. Snce all the servces are ted together, many more loads are suppled from the same secondary network source than n a smple radal system. The peak loads on the transformers are correspondngly lower n the network system compared Customer Loads Te NC Customer Loads to a radal system supplyng the same loads, because of the dversty n the demand among the larger number of crcuts. Therefore, less transformer capacty may be requred n a network system than n a radal system n the same area, partcularly f three or more prmary feeders supply the network system. System Operaton Typcal Feeder To Other s Low Voltage Swtchgear Drawout A short crcut on any one prmary feeder wll cause all the network protectors on that feeder to open on reverse energy, provded the total power on the three-phase feeder s n the reverse drecton. When the feeder cable s repared properly, the network protectors on that feeder wll automatcally reclose when the feeder crcut breaker at the upstream swtchgear s closed, f correct voltage condtons exst at the network transformer. If the phases are reversed durng the cable repars, the protectors wll not reclose automatcally as long as the network remans energzed. Lkewse, f a voltage less than network voltage s restored to the feeder, the network protector on that feeder wll not reclose automatcally. The unt could be closed manually f the network relay trp contact s not closed. If a feeder from a networkable source s to be connected to an energzed network, the ncomng voltage must be slghtly hgher than the network voltage and n proper phase relaton wth t. If a feeder s beng connected to a dead network, t s suffcent to have the ncomng voltage hgh enough to operate the closng mechansm. 0 CA0000E

4 .0- Dscusson General Descrpton September Sheet 00 0 Mantenance of prmary feeder crcuts can be accomplshed by openng upstream swtchgear prmary devces one at a tme, thereby openng every protector connected to a gven prmary due to reverse magnetzng currents flowng through each protector served. By openng the prmary crcuts one at a tme, the network loads are not dsturbed. Also, at tmes of lght load, the system can be economcally loaded by dsconnectng some of the prmary crcuts and operatng the transformers at more effcent levels. Although the protectors are capable of openng under reverse magnetzng currents, the openng may be delayed dependng upon the tme delay settng of the network relay. When the load ncreases on the network, other prmares can be brought nto servce by closng the feeder breakers. The assocated protectors on the reactvated feeders wll reclose servng the network f the transformer voltage s hgher than the network voltage by a certan mnmum amount and n the proper phase relaton. The network protector fuses provde backup protecton for clearng faults on the prmary feeder n the unlkely event the protector fals to operate. These meltng alloy or partal range current lmtng fuses are located on the load sde of the protector, and when removed, serve to solate the protector from the network. Numerous protector models are avalable from Eaton and the best product for the applcaton s a functon of the type of system beng desgned: utlty grd (see Fgure.0-) or spot network. Spot network systems (see Fgure.0-) usually use the CM type of protector, whch has mportant safety features not found on earler Eaton or compettor models. Typcal Protector Grd LOADS LOADS LOADS Fgure.0-. Typcal Confguraton for Utlty Grd CM Protector Advantages CM Protector Exclusve Drawout Desgn: Wth postve safety nterlocks, provdes maxmum protecton aganst contact wth energzed components whle dsconnectng the unt for test or mantenance; ensures maxmum safety for operatng personnel. All man current carryng and mechancal operatng components are located behnd a deadfront panel whch mnmzes the possblty of tools or hands beng nserted nto an energzed protector. The drawout unt s operated by a hand-cranked leverng system, whch cannot be engaged unless the crcut breaker s open and cannot be dsengaged unless the drawout unt s ether fully dsconnected or fully connected. Modular Constructon: Smplfes feld mantenance and/or replacement of components. Protectors can be quckly LOADS LOADS LOADS Prmary Feeder Breaker LOADS LOADS LOADS Typcal Transformer Grd put back nto servce reducng mantenance tme. Sprng Close Operatng Mechansm: Avods partal closures. The CM sprng close mechansms wll not permt closng moton of the contacts untl the closng sprngs are fully charged. Also provdes close and latch ratngs on protectors. Externally Mounted Slver-Sand Fuses: Operate wth no contamnaton of the protector, and wll postvely nterrupt fault current to dsconnect the protector from the network bus n abnormal fault stuatons. Low Energy, Trp Actuator: Provdes relable trppng effort, even when system voltage s not avalable, up to four operatons va remote trppng before rechargng s needed. Close and Latch Ratngs: Ratngs comparable to ar power breakers are readly avalable snce the mechansm s sprng charged, unlke motor operated protectors whch have no close and latch ratngs. Increased Delectrc Strength: CM unts have passed a more strngent delectrc test voltage of 000 Vac compared to the lower value of 0V requred by ANSI standards. Stored Energy Opton: The CM can be provded wred for stored energy. Ths opton charges the closng sprngs after a closure, resultng n a -cycle close after a trp event. Ths s the preferred confguraton for -unt spot networks. CA0000E

5 September Sheet 00 Dscusson Commercal Spot Desgn Consderatons.0- Commercal Spot Desgn Consderatons Ths secton deals wth the varous components whch make up the commercal spot network, ether as a double-ended substaton or multple transformer substaton. The ntent of the dscusson s to gve some basc gudelnes for the selecton of Eaton transformers and network protectors. The major components that wll be dscussed are:. Prmary swtches. transformer types. protectors. Spot network dsconnects. Low voltage drawout swtchgear confguratons. Typcal spot network layouts. Use of current lmtng fuses. devce coordnaton. Medum Voltage Prmary Swtches The ncomng medum voltage feeder may range from 0V to. kv. Any feeder whch has a voltage hgher than. kv should not be consdered for spot network servce because the cable chargng capactance begns to affect the operaton of the network relay response. The prmary feeder enters nto a swtch compartment, whch can be lqud or ar type. The lqud type transformers usually use a specal three-poston, lqud-flled, non-loadbreak prmary swtch, whch has a specal thrd poston for groundng the ncomng feeder cable durng mantenance work on a prmary crcut. Dry-type transformers usually use a two-poston ar swtch, whch omts the thrd poston. Groundng the crcut becomes a manual procedure, f needed, on dry-type transformers. The three postons of the lqud type non-loadbreak swtch on lqud network transformers are:. Close. Open. Ground These lqud swtch desgns use electrcal nterlocks that prevent the unntentonal movement of the swtch, wth ether the network protector n the Closed poston or the medum voltage feeder beng energzed. Fgure.0- shows the typcal Prmary Mag- Break Swtch Col # Interlock Open Closed Ground Poston Col # Interlock Transformer Fgure.0-. Three-Poston Prmary Swtch Interlock for Lqud Transformers electrcal connectons for the nterlockng between the prmary swtch, transformer and network protector. Col # and # are electrcal nterlocks whch prevent unsafe operaton of the prmary mag-break swtch. Col # ensures that the protector must be used to break load current before operatng the swtch from closed to open. Col # ensures that the prmary cable must be deenergzed before operatng the swtch from closed to ground. These nterlocks are not necessary on a two-poston ar swtch f t has loadbreak ratngs. Due to ther common use, lqud type network transformers are manufactured wth the three-poston mag-break only swtch ntegral to the transformer. Drytype transformers use the commonly avalable two-poston ar swtch wth specal flcker blades whch gve the ar swtch a loadbreak ratng. The capablty of nterruptng load currents can save tme by not havng to deenergze the feeder. The choce of swtch type s thus dctated by the type of transformer selected for the spot network system. Another consderaton s the necessty to provde prmary overcurrent protecton for each transformer, such as n the form of power fuses. Upstream breakers usually serve two, three or four transformers on ther crcut and thus have the protectve relays set at hgher levels dctated by the entre crcut load, whch sacrfces ndvdual transformer protecton. See Fgure.0- later n ths secton for a specfc example of ths type of stuaton. When dry-type unts are used, one soluton s to add power fuses to the loadbreak swtches. However, ths opton s not easy when lqud types are used unless ar b Protector Interlock logc can vary thus both an A and B auxlary contact s suppled. a Fuses To swtches are added ahead of the ntegral type lqud swtches. Eaton recommends that no more than two transformers be served by a sngle upstream breaker and relay, unless separate fused ar swtches are located ahead of the transformers. If fuses are used anywhere n the prmary crcut, the network protector relays must be capable of trppng under WATT-VAR condtons. New dgtal type network relays have the ablty to confgure ther trppng characterstcs from WATT to WATT-VAR n the feld. Older type protectors havng electromechancal relays should be updated by retrofttng wth the newer relays. If fuses are not present, the standard WATT trp characterstc, whch s standard n the ndustry, s approprate. Each type of prmary swtch uses unque termnatons of the prmary cable. Lqud swtches use a termnal chamber whch s flled n the feld wth a sutable compound to mprove the nsulaton strength of the cables. Ar swtches use mechancal or compresson termnatons wth stress cones. Ar swtches requre more floor space than the ntegral lqud type of swtch, especally snce the depth of the ar swtch s made to match the depth of the transformer. Transton sectons add to requred floor space f hard bus connectons, not cable, are requred. Whereas the three-poston lqud swtch dmensons are no greater than.00 nches (0.0 mm) deep off the end of the transformer and 0.00 nches (.0 mm) n wdth centered at the end of the unt. 0 CA0000E

6 .0- Dscusson Commercal Spot Desgn Consderatons September Sheet 00 0 It s possble to use both types of swtches for lqud nstallatons. Groups of ar swtches can be mounted along a wall to receve and dstrbute prmary crcut power to each transformer. Indvdual power fuses can be mounted wthn the ar swtches. Dry-well mountng of current lmtng fuses n ar cansters accessble from the top or sde walls of the transformer s not recommended. The avalable space wll dctate much of the desgn f suffcent space s not allocated for electrcal system equpment. Prmary swtches accommodate the three-phase conductors and never use a neutral conductor. Most spot networks use delta wound transformers, so there s no need to delver the neutral through the prmary swtch. Any type cable can be used, however the more modern types are easer to handle than paper lead nsulated types whch requre potheads for termnatons wthn the prmary swtch.. Transformer Characterstcs After the prmary swtch, the power s delvered to the prmary wndngs of a network type transformer. The desgn may be lqud- or dry-type, wth lqud types beng more popular from a hstorcal perspectve, due to ther applcaton n utlty systems. However, dry-type desgns are now avalable meetng the ANSI network standards. Most applcatons wthn commercal buldngs desre dry-type desgns due to the desre to avod the fre hazard assocated wth lqud delectrcs. It s mportant to use proper dry-type ratngs whch mmc the overload characterstcs of lqud unts, therefore dry types should be rated for 0 C rse and use Class H ºC total temperature nsulaton materals n VPI desgns or C n cast col desgns. Fans are normally employed to ad the ar coolng durng perods of overloadng, and whch occur durng a sngle prmary outage. Secondary voltages are always 0V wye or V wye. Also, V wye s a common ratng. Prmares are always delta, such as 0V,. kv,. kv, etc. Transformer mpedances should fall wthn the standard ranges ndcated n Table.0-, or else the usual protector nterruptng ratngs may become nadequate. If mpedances drop below these values, the maxmum through-fault may exceed the nterruptng ratng of the protector. Also, the mpedance values among transformers n a spot network should be as close n value to each other that manufacturng tolerances wll allow; ths helps reduce crculatng currents between transformers. Table.0-. Transformer Impedance kva Sze Recommended Z % or greater % or greater Notce that 000 kva s typcally the largest transformer that can be used for network servces, although Eaton can go hgher. As an example, let s assume a twount spot network usng dry-type transformers havng 0 C temperature ratngs. In ths example we calculate that the buldng load wll not exceed kva. Snce we are desgnng the servce as a double-ended network substaton, ether transformer must be capable of carryng the full buldng load of 00A. One choce s to select a 00 kva transformer sze whch has a full load ratng of 0 amperes. However, n specfyng transformers for network servces, the unts can be underszed, realzng that under most condtons both unts are avalable to supply power to the network. When only one s handlng the entre load, t should be consdered an abnormal event that should not contnue ndefntely. For our load of kva, a 000 kva transformer wll supply amperes at % of nameplate ratng, therefore we would select a 0 C rse 000 kva dry-type unt operated at ºC wth fans (% overload capablty) and a protector wth a contnuous ratng of A. In all spot network desgns, the equpment must be szed to handle the load even though one prmary, and thus one transformer, s out of servce (known as a sngle contngency condton) for some perod of tme. The basc desgn constrant s that the load not exceed the maxmum thermal ratng of the remanng unt(s) durng the tme of the sngle contngency. Protector ratngs recommended by vendors, as well as protector crcutry, antcpate the loads and are szed to handle the hgher currents, so the lmtng factor s the transformer. One advantage of lqud desgns s ther large thermal mass whch enables them to handle hgher currents for a longer perod of tme wthout the need for an FA fan ratng when compared to conventonal dry-type desgns. When both transformers are avalable, the 000 kva unts n our example wll only be loaded to % of ther AA base ratng. The transformer wndng confguraton wll depend upon the prmary servce avalable and the type of servce needed by utlzaton equpment comprsng the loads. For the most part, transformers are DELTA-WYE, whch permts the lowest ground relay pckup value for the prmary feeder breaker. Ths type of wndng confguraton also elmnates any zero sequence current n the prmary feeder for load unbalances n the secondary. At hgher prmary voltages, kv through. kv, some use has been made of GROUNDED WYE-GROUNDED WYE wndngs. The advantage ganed s the reducton of overvoltages whch can result f one leg of the unt s de-energzed. The dsadvantage s that the prmary breaker ground relay must be set much hgher because load unbalances and ground faults n the secondary are reflected by zero sequence currents n the prmary crcut. See Pages.0- and.0- for network transformer features.. Protector The network protector can be provded n a weather-proof NEMA housng, submersble or sutable for mountng wthn a low voltage swtchgear assembly. Both the transformer sde (lne) and network (load) connectons of the protector are bus bar whch can accommodate transformer flange connectons and loadsde connectons to cable, busway or swtchgear buswork. protectors are specal selfcontaned ar power breaker unts havng a full complement of current, potental and control transformers, as well as relay functons to protect the ntegrty of the low voltage network bus. Normally, protectors do not have any overcurrent protecton n the forward drecton; f necessary, the 0/ functon can be acheved through the use of remote mounted protectve devces. Fgure.0- llustrates a smplfed dagram of the varous components of the network protector. Note: The symbol for a protector s the ar breaker symbol wth a dot n the mddle. CA0000E

7 September Sheet 00 Dscusson Commercal Spot Desgn Consderatons.0- Protectors have ether rollout or drawout mechansms for easy mantenance. Protectors havng the drawout mechansms, such as the CM type, are comparable to ar power breakers n terms of mantenance and stored energy functons. The older rollout unts use manually dsconnected fuses and lnks whch must be removed from the energzed network bus pror to rollng the unt out of the cubcle for nspecton, testng and mantenance. Detals on protectors are revewed later n ths secton and the recommended spot network equpment ratngs for two, three and four unt confguratons are shown n Tables.0- through.0- that appear on Pages.0- and.0- n ths product secton. The protector load sde contans a network fuse, usually a partal range current lmtng type. The fuses are present as back-up protecton f the protector fals to open properly. These fuses are separately removable, but do not drawout wth the protector mechansm. Commonly, the fuses are located at the top of each protector. The fact that the fuses are located on the network sde means that fuse mantenance requres operators to come nto contact wth lve parts and conductors whch can delver hgh fault currents. A method of easly dsconnectng the secondary of the protector from the network bus, smlar to the confguraton of the prmary, s needed to solate the fuse and protector, thus the need for a network dsconnect.. Spot Dsconnects The multple sources of power to the network bus can create a safety concern on the load sde of each protector. Obvously, each protector loadsde s energzed from the network so long as at least one transformer remans connected. The use of a network dsconnect can provde a degree of operator safety by requrng that the dsconnect be used to dsconnect the protector loadsde from the network before allowng access to network fuses or protector mechansm. Such a dsconnect reduces the lkelhood of contactng lve bus and forces operators to follow a safe procedure pror to any protector mantenance. Accdents nvolvng protectors can be traced to the absence of such devces n customer s facltes and dstrbuton system desgns. Eaton encourages the use of network dsconnect devces, especally n facltes not havng dedcated mantenance staff. Many forms of dsconnect devces are avalable; the specfc choce depends upon several related factors such as protector mountng, use of man breakers, protector type, etc. Three key choces for network dsconnect devces are outlned below. Types of Dsconnects Prncpally, the two types are man ar power crcut breakers wthn swtchgear assembles and non-loadbreak hookstck operated swtches mounted above the protectors n a NEMA cabnet. Regardless of the type used, each dsconnect s nterlocked wth the protector to ensure that the loadbreak protector s used to break and make the load currents. The protector mechansm s rated for at least 0,000 operatons before mantenance and s the best devce to nterrupt normal load currents. Protectors nclude an operatons counter to keep track of the number of operatons. The nterlocks may be keyed type or electrcal control wrng. Refer to Fgure.0- for a typcal one-lne. Man Breakers Man ar power breakers are the safest opton to use as a network dsconnect, however ther nterruptng ratng guarantees proper operaton under all condtons ncludng fault currents. Swtchgear mountng of the man breakers means that the dsconnect devce s the same type of devce as all other overcurrent devces mounted n the assembly, thereby requrng common mantenance and operaton procedures. The mans can be key nterlocked wth ther respectve protectors to ensure that the protectors are opened frst, then the mans are opened and racked to a dsconnect poston pror to mantenance of the protector or crcut devces. Man breakers nclude overcurrent trp unts to provde ndvdual overload protecton for each protector and conductors. Ths protecton s not a normal functon of the network relays and augments protecton generally so long as the trp unt settngs are properly coordnated wth the te and feeder devces. The trp unt protecton does not protect the ncomng cable aganst fault currents such as ground faults or short crcut currents; the sensors are not located at the lnesde of the protector crcut, rather they are at the swtchgear (load) sde thus gvng only overload protecton. The key nterlockng between man ar power breakers and network protectors may be elmnated snce the man s a true nterruptng devce usually rated at or above,000a nterruptng at 0V. When mans are used as loadbreak devces on network servces, the openng of a man may result n the openng of the respectve protector, however mantenance procedures should always verfy protector operaton. Non-Loadbreak Dsconnect The network dsconnect devce for mountng above the protector s the non-loadbreak bolted pressure swtch. The devce s hookstck operated from the floor and provdes a relable means of vsbly dsconnectng the protector crcut from the loadsde of the protector. The swtch s NEMA cabnet mounted wth double doors and electrcal nterlocks to assure that the protector s used to break the load current. The door nterlocks have a defeatable procedure f qualfed personnel need to gan access under load flow condtons. Key nterlockng wth the protector s not necessary. 0 CA0000E

8 .0- Dscusson Commercal Spot Desgn Consderatons September Sheet 00 0 Protector Fuses Protector Loadsde () MPCV = Protector Relay Transformer Fgure.0-. Typcal Protector Schematc Cont. Lnesde (Transformer) LV SWGR kv or kv Prmary o 0 Wye 0/ Fgure.0-. Partal Spot One-Lne Dagram Recommended when no separate man breaker s used. Ths product has become a standard for Eaton and s manufactured n the same plant as the protector for mproved assembly and product coordnaton. Recent desgns move the NPL fuses on the protector nto the dsconnect cabnet to ensure that fuses have controlled access. Space exsts wthn the cabnet to mount separate current transformers to provde nputs for separate nstantaneous and tme delay overcurrent relays whch protect the protector crcutry from pont of supply to the swtchgear buswork. The General Servces Admnstraton uses ths type of product on hundreds of network unts throughout the Natonal Captal Regon and n other areas of the country where networks are used. Potental Transformer (PTs) 0V Control Txs. Cts MPCV Phasng Voltage PTs V V Ground MPCV Trp b a MPCV Voltage Motor Transformer Protector Fuses Dsconnect Swtch (Optonal) Man Breaker NC MPCV Close Trp Te MPCV Trp Cont. The non-loadbreak desgn has been chosen over the loadbreak for several reasons. Frst, the loadbreak mechansms need regular mantenance and should not be allowed to st n a closed poston for years, then be called upon to operate wthout falure. Ths type of duty s exactly what s requred of a network dsconnect. Addtonally, the operatng mechansm of a loadbreak desgn requres a lot of force, more than an operator can safely delver from a ladder or step. Hookstck operaton from the floor s a safer procedure. Refer to Fgure.0- for typcal secton vew of network unts usng a network dsconnect atop the protector. transformer neutrals are brought to the loadsde area of the dsconnect for transtonng to the protector crcut neutral for delvery nto the swtchgear. The loadsde of the dsconnect can accommodate outgong busway or cables as needed. See Page.0- for network dsconnect features. 0/ Relayng for Protectors Users who specfy the non-loadbreak dsconnect can easly add the current transformers for relayng at the load sde of the protector crcuts and provde superor fault and overload protecton for the ncomng conductors between the protector and the swtchgear buswork. The relays are usually mounted wthn the swtchgear and use a lockout feature to trp and lockout the protector. Modern mcroprocessor relays such as the Eaton Dgtrp 000 can also be used for the 0/ protecton to save costs and mountng space. The use of forward relayng on the protector crcut needs to be coordnated wth the te breakers to ensure that the protector auxlary 0/ protectve settngs are not faster than the te settngs. Coordnaton s acheved when the tes are faster actng than the 0/ protector forward overcurrent relays, and they usually trp open frst due to the presence of multple transformer faults passng through the tes. See Fgures.0- and.0- for more detals. Also refer to tables on Pages.0- and.0- for detals on the recommended te devce ratngs and settngs. The use of forward relayng current transformers s recommended even when the non-loadbreak dsconnect s not used, such as occurs when only transton boxes are used at the top of the protectors. System Neutral Groundng Regardless of the devce selected as the network dsconnect, the XO transformer neutrals are not grounded at the transformers. Rather they are brought nto the swtchgear and grounded at one and only one locaton. Ths confguraton allows the use of the ground return method of ground fault protecton whose zone of protecton extends from the secondary transformer wndngs to the outgong ar power breakers n the swtchgear. Other ground fault detecton methods are possble, but are consderably more complcated to wre and mantan and are wthout sgnfcant advantage or greater relablty. CA0000E

9 September Sheet 00 Dscusson Commercal Spot Desgn Consderatons.0-. Low Voltage Drawout Swtchgear Confguratons The most relable and safe network bus equpment s n the form of low voltage drawout swtchgear bult per ANSI C standards. Unlke the UL swtchboard assembles, low voltage swtchgear uses true 0,000A braced buswork, 0 cycle short tme ratngs, drawout stored energy ar power crcut breakers rated for 00% applcaton, for easer mantenance all of whch provdes superor performance compared to fxed mounted molded case breakers n swtchboard constructon. Ths s true regardless of where the protector s mounted. A typcal swtchgear nstallaton of a protector uses a low voltage swtchgear compartment whch s.00 nches (. mm) hgh x.00 nches (. mm) wde x nches (.. mm) deep. The use of transton sectons between the protector and swtchgear ensures that suffcent space exsts to route buswork between the two compartments. Refer to Fgures.0- through.0- whch llustrate typcal plan vews and front elevatons for double-ended network substatons and three transformer spot network desgns. Fgure.0- shows the bus confguraton of the two-unt spot network substaton. Note that there must be a separate ground return neutral bus whch has only one pont of connecton to the groundng conductor. Ths type arrangement permts selectve trppng of the Te, then the protector. For a lne-to-ground fault on Bus #, the T lockout relay controllng the Te breaker wll be operated frst when GFR-T detects.0 per unt ground current. After the Te breaker s open, the lne-to-ground fault current s sensed only by GFR-, whch wll actuate the - lockout to trp the network protector NP #. For prmary faults, the network relay must be set such that t can respond to both reverse magnetzng levels of current as well as to any prmary crcut fault current. Snce most systems employ DELTA-WYE wndngs, prmary faults wll not be detected by ether GFR-T or the GFR devces assocated wth the protectors, snce no zero sequence current wll flow. However, f GROUNDED WYE- GROUNDED WYE transformers are used, the relay coordnaton must be such that the network relay responds frst to prmary feeder faults. Ths permts the correct operaton of the protector under such condtons, CA0000E Prmary Swtch Neutral Bus Neutral (XO Bushng on Back) Transformer Fgure.0-. Typcal Non-Loadbreak Dsconnect Mountng Arrangement because the GFR-T should not attempt to trp the Te open. Therefore, power wll be mantaned on the low voltage bus wth the Te breaker remanng closed. See Fgures.0- and.0- for layout arrangements for dry-type and lqud-type spot networks respectvely. Fgure.0-0 shows the bus confguraton for a three-unt commercal spot network. Agan, the ground return neutral bus s requred whch has only one pont of connecton to the groundng conductor. Selectve trppng s acheved n the same fashon as the double-ended network substaton wth GFR-T sensng ground current and operatng the T devce whch then opens both Te breakers. The ground relays GFR-, GFR- and GFR- wll only sense ground current after the Te lockout s energzed and the Te breakers are open. Interlockng auxlary contacts on the -T wth the GFR crcuts guarantees ths selectve trppng and ensures the user that ground currents are accurately measured. The ampacty of the ground return neutral bus must meet the mnmum requrements of the neutral bus. It s prudent to sze the ground return neutral bus the same sze as the phase bus, snce the ground and neutral carry fault currents durng abnormal events. The space requred by the ground sensors and connectng buswork can be accommodated easly n two-unt spot networks. However, on threeand four-unt systems, the extensve structure-to-structure nsulated ground bus plus the normal phase, neutral and ground buses can reduce the usage of four breaker cells n the Load Transton Non-loadbreak Dsconnect NEMA Cabnet Fuse Locaton (Insde) Protector (CM Type) Secton Vew swtchgear to three. Vendor desgns vary on ths ssue. All four breaker cells are avalable on two-unt, threeunt, and four-unt systems from Eaton, when Magnum DS swtchgear s used. The ampacty of the phase and neutral buswork must meet the gross demand plus spare capacty for growth as stpulated by the Natonal Electrcal Code for the loads served. If each transformer on a two-unt spot network has been szed wth 00% redundancy, then each protector and load buswork should be rated to carry the entre load from one prmary feeder and one transformer. Threeunt spot networks can reduce the redundancy to 0% for the same loads snce two unts reman n servce. Four-unt spot networks may reduce the redundancy to %, unless the loads need to be served from two remanng servces n whch case 00% redundancy s stll requred.. Typcal Spot Layouts The amount of space avalable for the electrc servce wll dctate the sze and quantty of the network unts chosen for a project. Double-ended substatons, especally dry-type desgns, tend to be arranged n a sngle lneup wth the prmary feeders located at opposte ends of the room. Refer to Fgure.0- for an example of ths type of arrangement. The sngle lneup can be used f space permts. One alternatve s to locate the transformers behnd, or n front of the swtchgear, wth nterconnectng busway or cables. 0

10 .0-0 Dscusson Commercal Spot Desgn Consderatons September Sheet 00 0 Loads Fgure.0-. One-Lne for Two-Unt Spot Protectors not fused. -Poston PRI SW. (Fuse) PH. A,B,C N Feeder Breakers Transformer Fgure.0-. Front Vew of Double-Ended Substaton Three or more transformer unt spot networks cannot be arranged n one lneup, therefore they use the remote mountng of the transformers. Refer to Fgure.0- for an example of ths type of equpment layout. It s mportant to remember whch sde or end of equpment s used for normal operatons when desgnng a network layout. The prmary swtches are operated from the end as are the protectors. Swtchgear needs both NEC clearances at the front and the rear, due to the drawout breakers and the rear accessble cable compartments. Desgners are encouraged to pay attenton to the dfferent voltage levels present, both medum and low voltage, and the requred workng clearances gven n the NEC or local codes. N.P. # N.P. # - - 0/ 0/ GFR- Protector FDR FDR FDR FDR FDR FDR FDR FDR NC Te -T Te GFR-T FDR FDR FDR FDR FDR FDR FDR FDR GFR- GRN (Ground Return Neutral) Protector PH. A,B,C Feeder Breakers Equpment weghts should also be nvestgated to ensure that the structure can support the network assembles. Means of egress and routes to remove materal f replacement becomes necessary should be dentfed. Avod placng any network equpment aganst any wall; the NEC clearances requred probably double f two means of egress are not avalable. Structural columns pose challenges, however they rarely defeat network arrangements; avod swtchgear door openngs bumpng aganst columns before they are fully opened. The hghest pece of equpment may be the low voltage swtchgear, whch s usually.00 nches (. mm) n heght, plus the nches N Loads Ground Bus Transformer -Poston PRI SW. (Fuse) (..0 mm) requred by a ral mounted top of gear breaker lfter devce, or the network dsconnect, and must be accommodated. Lqud transformer unts have very hgh core and col untankng heghts, whch precludes any chance of untankng the core and cols n a normal buldng. See Fgures.0- through.0-. Regardng conductors, t s prudent to remember that busway can enter or ext a swtchgear structure at only one locaton. Room does not exst to accommodate more than the frst run of busway n a sngle secton, unless the frst connects at the top and the second connects at the bottom. A typcal plan vew for a three-unt spot network s shown n Fgure.0-; four-unt spot networks are smlarly desgned. If t becomes necessary to splt the swtchgear assembly, poston the splts at one sde or the other of the Te devces. Ths approach smplfes the power connectons of the neutral and ground buses. The number of network transformers used n a typcal spot network s drectly correlated wth the number of ndependent, yet networkable prmary feeders avalable. At least, that s a general rule to follow, however the secondary equpment can take many confguratons. Eaton recommends usng at least one normally closed te breaker n the low voltage metal-enclosed swtchgear for the purpose of solatng ground faults, and for mantenance of the assembly (cleanng, torqung and testng). Usually the number of normally closed Te breakers equals N-, where N equals the number of transformers used n the spot network. However, for some projects t may be desrable to have a rng low voltage assembly where the number of Te breakers equals N. In such a rng spot network, a Te busway or cable connects the extreme left sde bus of the assembly to the extreme rght sde bus, thus keepng the N- network confguraton even when one prmary or network transformer s down, or the low voltage assembly bus s down for mantenance or fault solaton. Man breakers, when used, may be postoned n swtchgear that s one ntegral lneup, or mounted n swtchgear close-coupled to dry-type transformer/protector pars whch feed power crcuts to remote assembles havng all Te and Feeder breakers. CA0000E

11 September Sheet 0 Dscusson Commercal Spot Desgn Consderatons.0- Hstorcally, some users and desgners have recommended usng low voltage busway as the spot collector bus, then feedng loads radally from the collector bus. Eaton does not recommend low voltage busway as the network collector bus, snce t has lmted short-tme ratngs and has hgher falure rates than the more robust low voltage metal-enclosed swtchgear. It s certanly acceptable to use multple segments of busway to feed protector crcuts nto the swtchgear, where the redundancy of busway crcuts prevents loss of power to loads for a sngle busway fault or falure, and the avalable fault currents are lmted to levels that can be delvered by one transformer, not N transformers. Control voltages for network protectors are usually Vac and derved nternally from the transformer secondary or wthn the protector tself, thus protectors are self-contaned regardng control power. The low voltage swtchgear assembly may be ac or DC wth AC control power beng more popular. The ac current control systems use a control power transformer on the ncomng of each protector crcut wth a control power transfer system on the secondares of all control power transformers to pck the frst lve source. The control power crcuts are always energzed so long as at least one protector s closed. The addton of man meters for power montorng, overcurrent relays and communcaton trp unts generally take very lttle space and can be accommodated wthout addng space f the swtchgear layout rules and standards are followed. It s possble to montor other non-swtchgear equpment by addng space for the requred number of communcatng addressable relays whch montor remote contacts wred to the swtchgear for status and alarmng at a remote power montorng and control system, such as transformer temperature and pressure alarms.. Use of Current Lmtng Fuses Generally, ths ssue needs to be addressed n the desgn stage of a project, pror to specfcaton wrtng. Protectors are usually appled wth fuse lmters on the load sde of each protector, but there can be exceptons to usng the lmters. The expected fault currents need to be calculated for several locatons, ncludng secondary wndngs of transformers, network swtchgear bus (both sdes of PH. A,B,C Loads N N.P. # N.P. # - - 0/ 0/ NC NC PH. A,B,C Te Te GFR- Feeder Breakers -T GFR-T Fgure.0-0. One-Lne for Three-Unt Spot Protectors are fused for three- and four-unt spot networks. Fuse locaton. Fgure.0-. Floor Plan for Three-Unt Spot System Te breakers), and at the load sde of feeder breakers. systems that use ar power breakers and delver more than,000a of fault current should use feeder breakers such as Eaton s Magnum DS breakers rated up to 00,000A. protectors are normally equpped wth load sde fuses (usually partal range current lmtng) and serve as backup protecton should the protector fal to open on reverse fault current condtons. Ar power breakers are now avalable wth kaic ratngs of,, 00 and 0 kaic, wthout fuses. GFR- Feeder Breakers Loads Ground Bus FDRS Aux. Aux. Aux. Sectons Te FDRS Sectons Te FDRS Sectons N N 0/ PH. A,B,C GFR- N.P. # - Loads GRN (Ground Return Neutral) Prmary Swtch Transformer Protector Busway or Cable Low Voltage Drawout Swtchgear In two transformer spot networks, one can argue that the protectors do not need to be fused for any applcaton up to and ncludng 000 kva transformers. The prncpal logc s that the Te can experence only the fault current from one transformer and that the Te protectve trp settngs provde faster actng backup protecton than the protector fuses for reverse power condtons. When protector fuses are used, the system needs to be desgned wth nterlockng to ensure that the fuses are not accessble unless the protector and dsconnect are opened. N Feeder Breakers 0 CA0000E

12 .0- Dscusson Commercal Spot Desgn Consderatons September Sheet 0 0 Transformer Fgure.0-. Floor Plan for Double-Ended Substaton # Protector Fgure.0-. Example of Two-Unt Spot Coordnaton Issues. Devce Coordnaton By way of example, we shall llustrate the level of coordnaton possble n a typcal two-unt network system as shown n Fgure.0-. In ths example, two networkable prmary sources are avalable and several transformers are presumed to be fed from each of the two prmary crcuts. The upstream prmary devce s a. kv vacuum crcut breaker wth a complement of relayng. Protector Aux. Aux. Sectons FDRS Te FDRS Sectons 0/ Prmary Medum Voltage Devces Two Poston Fusble Prmary Swtch 000/00 kva Dry Transformer AA/FA A CMD Non-Fused Protector 00A Te NC Typcal DS or DSL Feeders # Transformer Busway or Cable Tray Low Voltage Drawout Swtchgear E CLE Fuse 0/ To Other Spot s The medum voltage swtches are fused ar type. The swtches have two postons, open and closed, not three postons. We recommend that the prmary swtches use key nterlocks wth protectors to ensure that the protectors are used to break and make load currents, although ths nterlockng s not absolutely necessary snce the swtches are loadbreak rated. The lack of a ground poston n the prmary swtches does not mpede the normal operaton of the network system; rather t makes groundng the prmary cable a manual procedure. In ths example, a two-unt network wth 000/00 kva dry transformers AA/FA, 0 C rse are used. The transformers are confgured delta-wye wth. kv prmary, a 0V wye secondary, and the mpedance of each s wthn the range of..00%. Eaton Type CM Protectors are rated A and are mounted wthn low voltage swtchgear structures. The CM s a deadfront, drawout protector whose operaton s very smlar to the ar power crcut breaker used throughout the swtchgear to dstrbute power to the outgong crcuts. The network relay used wthn the CM s the MPCV type, a mcroprocessor-ntegrated sold-state relay that allows for feld programmng the network characterstcs. All CM protectors are factory wred for applcaton of remote trp and lockout functons, whch wll be used n our example va the lockout relay and separate 0/ protectve relay. The 0/ relay wll use 00/ rato current transformer nputs from current transformers mounted on the load sde of each protector wthn a transton box. The 0/ devce may be a sold-state relay, Dgtrp 000, due to ts broad range of feld programmable settngs. Thus, the protectors are used as man overcurrent protectve devces as well as protectors. When transformers are remote from the swtchgear, the current transformers must be located wthn a transton box atop the protectors. The current transformers may be used for meterng also, or f more accurate meterng at lower current levels s desred then a second set may be necessary n the swtchgear wth mult-ratos to match the average load demands. The low voltage assembly uses Eaton Magnum DS breakers for both Te and Feeder devces. The Te breaker wll be an MDS-, 00A frame, 00A trp, electrcally operated, drawout desgn, ncorporatng the Dgtrp trp unt. The feeder breakers are a mx of 00A frame and 00A frame to serve the outgong feeder crcuts. The swtchgear wll panel mount the two 0/ relays, whch provde overcurrent protecton for the protectors. In ths example, the fault currents are less than ka; however, systems havng hgher fault currents can be accommodated usng hgher-rated Magnum DS breakers. CA0000E

13 September Sheet 0 General Dscusson Coordnaton Curves The protectve devce settngs for a two-unt spot network are smlar to those used for a standard doubleended substaton. The goal s to serve both contnuty of servce and protecton equally. Settngs should not favor ether one or the other, but rather should keep loads served f at all possble and mnmze nusance outages even under serve fault condtons, ncludng ground fault events. Bascally, settngs should be mplemented whch allow the closest upstream devce near a fault to clear before other upstream devces trp. Faults n a network have more than one source, whch s a major dfference compared to double-ended substatons wth a normally open Te breaker. In Fgure.0-, we plot the tmecurrent curves of the medum voltage power fuses, whose man functon s to provde short crcut protecton to each transformer, the ANSI damage curve typcal for the transformers, the 0/ relayng upstream from each spot network, the Te and Feeder devce trp curves, and the 0/ relayng used by each protector. We have shown the prmary 0/ protectve relayng curves by postulatng ther relatve poston as beng to the rght of each damage curve and to the left of prmary cable damage curves, snce several transformers are served by each prmary servce. In other words, several vault locatons exst n the faclty. Obvously, these prmary relays cannot protect each transformer ndvdually, nor s t desrable to do so snce t s better to solate a smple faulted transformer wth a power fuse than to open the entre prmary crcut. The followng paragraphs detal the protectve devce settngs, dscuss the curves, and revew the mportant ssues. ANSI Transformer Damage Curves Two curves are plotted: both the 00% and the % damage curves are shown for the dry types n our example. These curves are defned n ANSI Standard. The % curve reflects the fact that a one per unt secondary fault on a grounded wye transformer creates a 0. per unt fault n the prmary conductors when the prmary wndngs have a delta confguraton. Dscusson Commercal Spot Desgn Consderatons TIME 00 Legend: Fgure.0-. Two-Transformer Spot Phase Overcurrent Eaton CLE E Power Fuses The selected current lmtng fuse, E, provdes lttle f any overload protecton for the transformer, however, t does an acceptable job of supplyng NEC code mandated short crcut protecton for the 00% damage curve. The fuse cannot provde protecton for the % curve and downszng the selected ratng lower than E s lkely to result n nusance fuse operaton. Each power fuse vendor has applcaton tables and charts to properly select fuses for any applcaton. The fuse meets the NEC stpulated protecton, but lacks the flexblty of a relay wth nearly contnuous adjustments. If superor protecton s desred, then a vacuum breaker wth 0/ relayng should be used n leu of the fused prmary swtch. Do not use 0/ relayng on a load nterrupter swtch B CURRENT (Amperes) R Prmary 0/ Relayng Typcal for These Transformers T 00% ANSI Damage/Wthstand Curve for Transformer T % ANSI Damage/Wthstand Curve F Power Fuse E Ratng P Protector Relay 0/ (Both LTD = 0 Seconds and Seconds Shown) T Te Breaker 00AT MAG = TX INRUSH B Feeder Breaker 00AT MAG = TX INRUSH T MAG R P T T F MAG CA0000E

14 .0- Dscusson Commercal Spot Desgn Consderatons September Sheet 0 0 Protector Relayng Eaton Dgtrp 000 Plus Ground Fault Relay (GFR) relays do not have any form of forward 0/ (nstantaneous and tme overcurrent) protecton, therefore f t s desred t must be added separately. An lockout relay s recommended for postve lockout ndcaton and reset operatons. The curve for the Dgtrp 000 s shown n Fgure.0- and depcts the settngs for ths mcroprocessor-based soldstate mult-phase relay. Usng the 00/ rato current transformers, the settngs are as follows: Long Tme Pckup (LTPU) =.0 (00A) Long Tme Delay I t (LTD) = 0 seconds Short Tme Pckup (STPU) = X (000A) Short Tme Delay (STD) = 0. seconds Instantaneous (INST) = X (00A) Ground Fault Relay (GFR) Ground Fault Relay (GFR) = 00A pckup = 0. seconds ( cycles) It s very mportant that the protector 0/ settngs be slower than the Te breaker. The faster actng Te s desred for solaton of swtchgear faults between one sde of the Te and the loadsde of a protector wthout takng the whole network down. The Te clears one transformer s fault contrbuton, whle the unfaulted sde remans energzed. The protector experencng the remanng fault current wll subsequently trp open, thereby solatng one-half of the network bus for repar. Faults located n the transformer secondary wndngs may open both the Te and the protector, dependng upon the magntude of the event. The protector should open frst upon reverse power, snce protectors respond to reverse power n cycles. If the Te also trps open, the Te can be reclosed to serve the entre load agan after lockng out the protector on the faulted transformer. Note: The transformer s gven superor overload protecton by the Dgtrp 000 compared to the level of protecton gven by the power fuse. Ths s especally true even n the overload regon of the ANSI damage curve. Te Breaker Eaton MDS 00A wth Dgtrp LS Plus Ground Fault Relay The settngs shown n Fgure.0- were developed usng 00/ sensors on the Te breaker. The settngs recommended are: Long Tme Pckup (LTPU) = 0. (00A) Long Tme Delay I t (LTD) = seconds Short Tme Pckup (STPU) = X (00A) Short Tme Delay (STD) = 0. seconds Instantaneous (INST) = Not used Ground Fault Relay (GFR) Ground Fault Relay (GFR) = 00A pckup = 0. seconds ( cycles) See Fgure.0- These settngs allow the Te to act quckly for abnormal current condtons, yet also provde enough delay to allow protectors to trp on reverse current when protector operaton s the prudent frst course of acton. Also, larger feeder devces, such as 0A breakers (not shown n Fgure.0-) wll easly ft to the left and beneath the Te curve. It s mportant to set the Te to operate qucker than the protector 0/ relayng. The faster Te settngs assure that swtchgear bus faults do not take the entre servce down (only half). In our example, the Te wll only be called upon to nterrupt the fault current from one transformer. Typcal Feeder Eaton MDS 00A wth Dgtrp LSIG The settngs n Fgure.0- were generated usng 00/ sensors appled on the feeder breakers. The Dgtrp trp unt settngs are: Long Tme Pckup (LTPU) =.0 (00A) Long Tme Delay (LTD) = seconds Short Tme Pckup (STPU) = Not used Short Tme Delay (STD) = Not used Instantaneous (INST) = X (00A) Ground Fault Pckup (GFPU) Ground Fault Delay (GFD) = F (00A) = 0. seconds ( cycles) See Fgure.0- These settngs provde for fast acton of feeder devces experencng the maxmum fault duty of the swtchgear (fault current from two transformers). Ground fault protecton s recommended for the feeder trp unts; these settngs can be coordnated wth the two-stage ground fault detecton system (sngle pont ground return method) mentoned earler n Fgure.0-. Suggested ground fault protectve devce settngs are llustrated n Fgure.0-, and the settngs are lsted under the protector, Te breaker, and feeder devce dscusson n ths secton. CA0000E

15 September Sheet 0 Ground fault settngs are establshed essentally the same as a double-ended substaton usng a sngle tee ground pont and ground return methodology. Eaton s MDS feeder breakers are set to coordnate wth downstream devces so that downstream breakers experencng a fault trp frst. The GFR relays for the Te and protectors are set slghtly hgher n pckup and have a longer delay than the ground fault for the feeder devces. Protector and Te ground fault settngs are usually set at the same levels; coordnaton s acheved by nterlockng the two stages so that the Te stage operates frst followed by the protector stage. Ground current orgnatng from faults n the swtchgear buswork or ncomng conductors s drectly measured by the GFR on the Te, then by one of the protectors after the Te opens. Subsequently, the GFR on the faulted zone causes the protector experencng the fault to trp open thereby solatng the fault completely. Downstream ground faults are cleared by downstream crcut breakers or the DS feeder breaker servng the faulted crcut. Dscusson Commercal Spot Desgn Consderatons Fgure.0-. Spot Ground Fault Protecton.0-0 CA0000E

16 .0- Protector Equpment Lqud-Type Transformers September Sheet 0 0 Lqud-Type Transformers Typcal Lqud Transformer transformers are avalable wth lqud mmersed core and col assembles, and use the lqud as the prncpal nsulaton means for prmary and secondary wndngs. The flud can be mneral ol, slcon or a bodegradable form of vegetable ol. Indoor applcatons beneft from usng slcon or the bodegradable vegetable ol lqud delectrc. See the dscusson below for ABB s BoTemp flud. The transformers are bult to ANSI C..0 standards and have an ntegral prmary non-loadbreak threeposton swtch havng connected, open and grounded postons. The grounded poston grounds the ncomng medum voltage feeder that serves the transformer, and does not ground the prmary wndngs. The prmary swtch s nterlocked wth the assocated network protector and secondary transformer wndngs to ensure that the swtch s only used to break or make magnetzng current. Lqud network transformers have a specal low voltage flange for feld mountng a network protector on the secondary flange. The protector s best mounted close to the secondary wndngs of the assocated transformer to mnmze dstance between the wndngs and the protector contacts. There are only two standard ANSI flange confguratons, smaller and larger, and the user generally gets one based upon the transformer kva sze. It s possble to chose one over the other, but the specfer must be careful n the selecton and make certan adequate load growth and redundancy are bult nto the system when choosng a small flange sze for a transformer that normally s suppled wth a large flange for a hgher ampacty protector. If the specfer stays wth the Eaton recommendatons for szng protectors, the flange sze s properly chosen for every unt. Lqud transformers are avalable wth an array of accessores, most of whch are lsted on the next page wth the outlne drawngs of a typcal lqud network transformer. Alarm contacts are usually wred to termnal boxes for use on alarm schemes or montorng. Certan accessores allow for the samplng of fluds at regular mantenance ntervals for testng and analyss. Table.0-. Typcal Propertes of Insulatng Fluds Descrpton BIOTEMP Mneral Ol H.T.H. Slcone Electrcal Delectrc strength, kv (ASTM D) 0 0 Physcal Vscosty, cst. 00 C 0. (ASTM D) 0 C 0 C Flash pt. C (ASTM D) 0 00 Fre pt. C (ASTM D) Specfc heat (cal/gr/ C) (ASTM D) Coeffcent of expanson, / C (ASTM D0). x 0. x 0.0 x 0.0 x 0 Pour pt. C (ASTM D) to 0 Sp. gravty (ASTM D) Color (ASTM D00) < <0. Envronmental Bodegradaton Rate (%) day CEC L BoTemp Advantages BIOTEMP s a natural ester flud made from renewable and bodegradable vegetable-based ol. Below are some of the envronmental, fre safety and operatonal advantages of usng BIOTEMP. Envronmental Advantages Even though secondary contanment s stll requred, BIOTEMP splls can be dsposed through normal means and not treated as hazardous or toxc waste BIOTEMP mnmzes ar polluton by producng only carbon doxde and water durng combuston BIOTEMP also offers the potental for relef from government regulatory penaltes, resultng n less costly spll cleanups Fre Safety Advantages BIOTEMP offers greater rsk mtgaton on collateral damage from transformer exploson and fre, potentally lowerng nsurance premums Actve fre suppresson and barrer walls can essentally be elmnated wth BIOTEMP when mnmal spacng s mantaned BIOTEMP can alternatvely be used safely ndoors and n tghter spaces outdoors typcally wthout addtonal fre safety requrements BIOTEMP s lsted as a less flammable delectrc flud by Factory Mutual (FM Global) and s classfed as a less hazardous delectrc medum n respect to fre hazard by Underwrters Laboratores (UL) Operatonal Advantages BIOTEMP mpregnated paper experences a much lower agng rate compared to mneral ol mpregnated paper, leadng to an ncrease n the nsulaton system lfetme (grd relablty) BIOTEMP mpregnated paper can alternatvely operate at a hgher hotspot temperature and attan the same lfe expectancy as mneral ol mpregnated paper, ncreasng the transformer peak load or overload capacty (energy effcency) CA0000E

17 September Sheet 0 Protector Equpment Lqud-Type Transformers.0- Sealed Tank Braced for PSI (0 KPA) Color Black. Base-Bar Type 0. (.0) x.0 (.0). Jackng Areas Total. Lftng Hook for Lftng Complete Transformer. Welded Cover wth Gasket and Lftng Loops for Lftng Cover Only..00 (.) Fllng and Upper Flter Connecton. Bolted Manhole.0 (.0) x.0 (.0) Openng wth Cortte Gasket. Relef Devce Over a.00 (.0) Handhole. Cap wth.00 (.0) Square Head for Access to De-energzed Tap Changer (wth Key Interlock, Coordnated wth HV Swtch). Item. LV Throat Per ANSI C..0 Fgure. LV Bushng Total. XO Bushng Style DG0 Spade. (.0) NEMA Drlled.. (.0) Wde x 0. (.0) Thck Spade..00 (.) Dran Valve wth Bronze Ppe Plug. Ground Pads -Hole NEMA Drllng 0 Total. Magnetc Lqud Level Gauge wth Alarm Contacts. Vacuum Pressure Gauge wth Alarm Contact and Ar Test Valve. Lqud Temperature Gauge wth Alarm Contacts. Rapd Pressure Rse Relay. Control Cabnet wth Undrlled Entrance Plate. Bolted Manhole.0 (.0) x.0 (.0) Openng wth Cortte Gasket. H.V. -Poston Magnetc Break Dsconnect and Groundng Swtch Operatng Mechansm wth Provsons for Padlockng, wth Key Interlock. Locked n Open or Ground Postons, Coordnated wth Tap Changer. Item and Second Key Interlock. Locked n Closed Poston and Coordnated wth Low Voltage Protector..00 (.) Fllng Couplng. Magnetc Lqud Level Gauge. Swtch Postons Top to Bottom, Ground, Closed, Open. Swtch Cover wth 0.0 (.) Taps for Jack Screws (Bolted on). Termnal Chamber Cover wth 0.0 (.) Taps for Jack Screws (Bolted on). Nameplate and Warnng Plate. H.V. Termnal Chamber..00 (.) Dran Couplng. Termnal for # to /0 Cable Range Total..00 (0.) Over Tank.00 (.) To XO.0 (.) To Cab XO.0 (.).0 (0.).0 (.).0 (.0) Over Swtch Entrance.00 (.) Entrance G & W Stuffng Boxes. Catalog Number RS-G,.0 (.0) CL to CL. 0.0 (.) Ar Test Fttng wth Bronze Ppe Plug. 0.0 (.) Top Lqud Sampler wth Bronze Ppe Plug. 0. (.0) Flud Level Plug. Interlock Bushng. 0.0 (.) Overall & Shppng Length.0 (0.).0 (.) CL Tank.0 (.0) To Swtch Entrance) Plan Vew X0.0 (.) X X X.0 (0.).00 (0.) Centerlne LV Throat.0 (.) Overall & Shppng Length. (.) Shppng Heght 0.0 (.).0 (.).0 (.).0 (.).0 (0.0).0 (.) Base Length.0 (0.0) Sde Vew Fgure.0-. Outlne Drawng 0 kva, / C Rse,,0 Delta to 0Y/ Volts Front Vew CA0000E

18 .0- Protector Equpment Dry-Type Transformers September Sheet 0 0 Dry-Type Transformers transformers are avalable wth dry-type core and col assembles, and use specal polyester resn or cast epoxy as the prncpal nsulaton means for prmary and secondary wndngs. The choce depends upon the economcs of the project. Indoor applcatons beneft from usng drytype networks snce no contanment or samplng of lqud delectrc s needed. Eaton strongly recommends 0 C rse cast col transformers for use n spot network systems. Typcal Dry-Type Transformer The transformers are bult to ANSI C.. standards and do not have an ntegral prmary swtch, unless a two-poston swtch s added n the feld. The process of groundng the ncomng medum voltage feeder that serves the transformer becomes a manual process of addng groundng cables. The two-poston prmary swtch s usually loadbreak rated and s not nterlocked wth the assocated network protector and secondary transformer wndngs. Eaton can also supply close-coupled prmary swtchgear wth a two-breaker (VCPW) transfer capablty on the prmary of cast col dry-type network unts. The proxmty of vacuum breakers wll mandate usng RC snubbers wthn the transformer. Dry-type network transformers have a specal low voltage flange for feld mountng a network protector on the secondary flange. The protector s best mounted close to the secondary wndngs of the assocated transformer to mnmze dstance between the wndngs and the protector contacts. There are only two standard ANSI flange confguratons, smaller and larger, and the user generally gets one based upon the transformer kva sze. It s possble to chose one over the other, but the specfer must be careful n the selecton and make certan adequate load growth and redundancy are bult nto the system when choosng a small flange sze for a transformer that normally s suppled wth a large flange for a hgher ampacty protector. If the specfer stays wth the Eaton recommendatons for szng protectors, the flange sze s properly chosen for every unt. Dry-type transformers can be closecoupled to LV drawout swtchgear wth protectors, te and feeder devces all swtchgear mounted. Dry-type network transformers are avalable wth an array of features, most of whch are lsted on the next page wth the outlne drawngs of a typcal dry network transformer. A transformer montorng package s usually ncluded wth temperature readngs, RTDs and Alarm contacts. Most desgns have knock-down enclosures for ease n rggng a unt nto poston through hallways and doorways. CA0000E

19 September Sheet 0 Protector Equpment Dry-Type Transformers.0- Total of Two Jack Screws 0.0 UN.00 (.) C L 0.00 (.0). (.). (.). (.0). (.0).0 (.).00 (.).00 (.).00 (.). (.).00 (.).00 (.0). (.).00 (.).00 (.).0 (.).00 (.) X X X. (.) TEMPERATURE MONITOR OR CUTOUT PROVIDED NAMEPLATE.00 (.) LV End Vew 0. x.0 (. x.0) Rects. (.) H H H.00 (.) Ventlated Surface Front and Back 0.00 (.) Front Vew X0.00 (.0) 0. x.0 (. x.) Slots. (.).00 (.) HV End Vew.00 (.).00 (0.).0 (.) 0.00 (.0). (.0). (.) 0.00 (.0).00 (.). (.0). (.) Characterstcs Enclosure: NEMA (ndoor ventlated wth drp-proof roof) Fnsh: ANSI Product type: Cast/Cast kva: 000/00 HV:,0 HV kv BIL: LV: 0Y/ LV kv BIL: 0 Taps:,0/,0/,0/,0/,0 Impedance: % Temperature rse: 0 C Coolng class: AA/FA Hertz: 0 Phases: LV wndngs: Cu HV wndngs: Cu Sound level: db Approxmate weght: 0,0/ lbs/kg Provsons for mountng network protector on the left end Prmary s cable connected to closed coupled prmary swtchgear, such as MVS Accessores Braced for sesmc ANSI LV end sheets Standard ventlaton Alumnum screens Copper ground bus (0. x.00) Neutral dsconnect lnk UL lstng Control panel Control power suppled by ABB Forced coolng 0 Fgure.0-. Outlne Drawng 000/00 kva Cast Col Transformer, 0 C/00 C Rse,,00 Delta to 0Y/ Vac Wye CA0000E

20 .0- Protector Equpment Type CM Protectors September Sheet 0 Type CM Protectors 0 Typcal Enclosed CM Protector Qualty Desgned to be Smarter, Safer and Streamlned The CM Protector provdes the hghest level of relablty and servce contnuty avalable today. An ntellgent protectve devce, the CM Protector s desgned to handle ratngs from 00 to 00A, to 00V. Ths new network protector features an electrcally operated, composte case, sprng closed ar network crcut breaker controlled by the MPCV network relay. The CM meets or exceeds the standards n IEEE C... Ths ensures a product wth the hghest performance standard applcable to a network protector. A frst for network protectors, the CM s settng a new standard by beng UL-qualfed. Ths thrd party approval certfes the delvery of a qualty product. A UL-qualfed network protector means easer code approval for qucker system start-up and less approval tme and costs n a non-utlty envronment. UL lsted and labeled CM protectors are presently avalable through 00A. Contact Eaton and the protector product lne for more detals on UL lsted and labeled CM network protectors. Protector Ratngs CM Drawout Several network protector models currently exst to satsfy all locaton requrements. The new CM desgn covers all of these ratngs, gvng you one type of protector to handle all nstallaton needs. The styles avalable nclude nternal or external fuse mountngs and submersble or NEMA enclosures throughout the current and voltage ratngs. Havng parts and accessores common through all protector ratngs means lower mantenance and nventory costs. The CM was also desgned wth hgher nterruptng and fault close ratngs than older protector models. Ths hgher ratng allows for safer nstallatons and better protecton on a network system. Table.0-. CM Ratngs Table Ratngs through 0 Volts Wye Contnuous Current Ratng / 00 00/ Interruptng Ratng Close and Latch Ratng Suggested Transformer Ratng (kva) V 0V CA0000E

21 September Sheet 0 Protector Equpment Type CM Protectors.0- Type CM Protectors CM Secondary Contacts Protector downtme s both frustratng and costly. No mechansm adjustments, few replacement parts, colorcoded wrng, dagnostcs, and a protected motor are key contrbutors to the hgh-level servce relablty and reduced downtme of the CM Protector. CM IDM The CM s a low mantenance network protector. It requres no mechansm adjustments, s easer to troubleshoot and has bult-n dagnostcs. Mantenance tme s no longer needed for the adjustment of protector contacts. Troubleshootng s much easer wth the CM through color-coded wrng and a front accessble test block. Dagnostcs are bult nto the Indcatng Dagnostc Module. The IDM replaces the tradtonal manual adjustment of the mn. motor pck-up adjustable resstor and offers dagnostc ndcators for avalable control voltage for the motor, sprng release and trp crcut. Wth the new CM, mantenance becomes easer and protector downtme decreases, savng money and ncreasng relablty. Much more manageable at less than half the weght of older network protectors, the protector s easer to handle, resultng n less tme n vaults, and lower labor costs. A four-poston, drawout, deadfront crcut breaker makes testng quck and safe, curbng mantenance tme and costs. The deadfront provdes worker safety, drastcally reducng the possblty of lve electrcty accdents durng nspecton. A front accessble -pont test block provdes safe and easy connecton of test equpment durng testng, phasng and troubleshootng. Qualty was the focus through the desgn to the manufacturng of the new CM Protector. The crcut breaker n the CM goes through a 00-pont testng procedure n an ISO 000 breaker specalty plant. The qualty desgn and testng of the CM vrtually elmnates the need for later adjustments and nsures a relable product. The Intellgence of the Protector MPCV Relay Wthn the CM les ts ntellgence, the MPCV Relay. The programmable MPCV Relay brngs the proven performance of mcroprocessor-based technology to the CM Protector. Ths programmable relay offers multple selectons to meet the requrements of each network protector nstallaton. Wth the MPCV, you can select between the tradtonal straght-lne master close curve and modfed crcular close curve. Our enhanced sequence-based algorthm provdes exceptonal performance and stablty over a wde range of temperatures and voltages n comparson wth a power-based algorthm. Addtonally, the antpumpng feature on the MPCV relay protects the motor under damagng system condtons. Communcatons The MPCV relay has bult n communcaton capabltes for montorng and control of the network protector. Ths allows users to access and dsplay nformaton from the relay ncludng voltage, current, energy usage, power qualty, and last trp detals. Control of the protector s possble from a remote locaton, provdng safer condtons and qucker response tme. The relay can also communcate other nformaton about the network protector s envronment through standard auxlary nputs. Informaton such as water or pressure loss nsde the network housng, or erratc nternal enclosure temperature wll send an alert notfyng of problems n the vault. The relay has the capablty of communcatng nformaton to a Data Concentrator/Translator (DC/T) over a shelded twsted par of communcatons wres. Informaton s obtaned through a utlty s SCADA protocol and/or Eaton s PowerNet software program. 0 CA0000E

22 .0- Protector Equpment Type CM Features, Functons and Benefts September Sheet 0 0 Features, Functons and Benefts. Standardzed Breaker Frames: Only three basc breaker frames of mnmal physcal sze are used throughout the CM to provde dfferent electrcal ratngs. Table.0-. CM Szes Ampere Breaker Sze Inches (mm) Ratng Wdth Heght Depth (.).00 (.).00 (.0).00 (.).00 (.). Lght Weght Breaker Element: A reduced breaker physcal sze also results n a substantal weght reducton compared to exstng Protector desgns. Table.0-. CM Weghts Ampere Weght n Lbs (kg) Ratng CM Breaker Element Comparable Breaker () 00 () () 0 0 (0 ) () ( 0). 0 kv BIL (Basc Impulse Level): Impulse testng s the applcaton of a hgh surge voltage on equpment to smulate possble surges caused by lghtnng. Although not defned or requred by IEEE/ANSI C.., ths test provdes an addtonal measure of safety and performance to the desgn. (The test was performed at.us x 0 us wave shape on a x grd.). Deadfront Drawout Breaker: Protects the user from accessng lve crcuts. Eaton offers the only deadfront drawout breaker desgns n the Protector ndustry.. Improved Interruptng and Fault Close (Close & Latch) Ratngs: Improved nterruptng and fault close ratngs ensure that the network protector wll wthstand fault condtons and contnue to protect ther assocated transformer. Table.0-. CM Ratngs Comparson Table Ratng Tested at 00 Volts Contnuous Breaker CM IEEE/ANSI Current Ratng Element Interruptng Close & Latch Interruptng (Amperes) Wdth Ratng (ka) Ratng (ka) Inches (mm) Ratng (ka) / 00 00/ (.).00 (.).00 (.).00 (.).00 (.).00 (.).00 (.0).00 (.0) Close & Latch ratngs apply only to sprng close and stored energy mechansms.. Four Breaker Element Drawout Postons: a. Connected Fully connected to prmary and secondary connectons. The door may be open or closed n ths poston. b. Test Prmary clusters are dsconnected, secondary wrng dsconnects are made. Testng can be performed on the unt at ths pont wthout dsturbng the power connectons. The door may also be opened or closed n ths poston. c. Dsconnected Prmary clusters are dsconnected, secondary dsconnects are open. The door must be open n ths poston. d. Removable poston Breaker element can be removed from ts rals. The door must be open wth the breaker element n ths poston.. Standardzed Modular Components: The motor, shunt trp, sprng release col, arc chutes, IDM, auxlary swtches and mult-rato CTs are easly removable, and man components are standard across dfferent ratngs. Ths allows reduced part nventores and reduced tranng for shop and feld crews. Convenent Accessores Low Mantenance: The breaker has no adjustments requred over the lfe of the unt and fewer replacement parts than tradtonal unts. A bult-n wear gauge shows the acceptable lmt of contact wear, makng the breaker condton easer to dentfy for servce perods. Easy Inspecton Close & Latch Ratng (ka) Sealed Motor Gear Box: Charges closng sprng n less than -/ seconds. 0. Indcatng Dagnostc Module (IDM): Replaces the tradtonal Motor Close Relay and adjustable resstor, and offers dagnostc ndcators on avalable control voltage for the motor, sprng release and trp actuator.. Front-Mounted Test Ponts: Easy access test ponts located on the front of the unt make for quck test cable connectons and avod requrng the operator to reach nto lve voltage area. CA0000E

23 September Sheet 0 Protector Equpment Type CM Optons and Standards and Certfcatons.0-. Improved Submersble Enclosure Desgn: Customer-Specfed Internal or External Fuse Mountng and revsed Hngng and Openng hardware for easer door openng and closng. The door has greater than 0 openng capablty. Optons Arc Flash Remote Rackng System The CM network protector s also avalable wth an ntegral remote rackng system. The system remotely racks the breaker off the energzed bus work whle the door s stll closed to the test poston ether through an external pendant or through communcatons. Test Block Access Cover Test Block wth Cover Removed. Unversal Wred Breaker: Breakers are wred all the same regardless of system voltage. Breakers can be nterchanged between V grds and 0V spots wthout modfcatons. Mult-Tap settngs for current transformers make changng amperes easy for maxmum flexblty and nventory reducton.. Retroft Adapter Frames and Bus Adapters: Allows replacng of most older GE and Westnghouse breakers n exstng enclosures.. Color Coded Teflon Wre: Red = Close Crcut Green = Open Crcut Whte = All Other Yellow = Normally Open Blue = Normally Closed Black = Common. Sxty (0) Pont Secondary Contact: Allows quck wrng for addtonal contacts, relays and other devces n the breaker element. Connectons are automatc for breaker rackng n and out. VaultGard Arcflash Reducton Mantenance System Indcatng Dagnostc Module The CM network protector s avalable wth the NPARMs module (Arcflash Reducton Mantenance System). Ths devce s nternal to the network protector and can be remotely actvated usually through a swtch mounted at the vault entrance or through communcatons. Ths wll enable the Arcflash Reducton Mantenance System devce on all CMs n a spot network. Once actvated, the NPARMs places the protectors n a senstve mode, sensng both forward and reverse current drectons. Ths devce wll actuate n ms and call for all CM breakers to trp f a fault s sensed on an adjacent network protector or collector bus. It has been shown that ths devce lmts the total ncdent energy to less than cal/cm. Remote Rackng System Standards and Certfcatons Meets or exceeds the standards n IEEE C.. The CM network protector s UL labeled and approved n the NEMA housng at all ratngs Sesmc Qualfcaton Refer to Tab for nformaton on sesmc qualfcaton for ths and other Eaton products. 0 CA0000E

24 .0- Protector Equpment NPL Fuse September Sheet 0 NPL Fuse , NPL Fuse Eaton s NPL fuse has been desgned as a nonexpulson, slver-sand type fuse. It s exclusvely for use on the CM network protector. Each end termnal s fabrcated from hgh conductvty, mpact extruded copper. Hgh qualty NEMA Grade G convolutely wound glass melamne tubng s permanently sealed to the termnal wth RTV Slastc to elmnate possble sand leakage or mosture entry. The termnals and tube are secured together wth stanless steel, hgh strength, sprally wound pns. All fuses are tested on an ultra-low resstance measurng nstrument capable of resolvng onehundredth of a mcro-ohm and evaluated on the bass of statstcal probablty technques to ensure unformty. Characterstcs of the NPL fuse have been especally talored for coordnaton wth the transformer safe-heatng curve and n consderaton of the protector nterruptng ratng. Ths specally desgned characterstc curve s less nverse than the ordnary meltng characterstc of a slver-sand fuse. The curve s a functon of the desgn of the unque, slver element used n ts make-up. The NPL fuse does not become currentlmtng wthn the nterruptng ratng of the protector. The fuses have been successfully tested n ts epoxy enclosure at a three-phase fault condton of 0,000A at 00V. The NPL fuse s not ampacty rated, and does not provde overcurrent protecton per NEC Artcle 0. Fusng a protector s necessary for three- and four-spot network transformer spot networks. Scale x 0 = Seconds Fgure.0-. Average Meltng Curve of NPL Fuse Table.0-. CM Protector Lmter Selecton Protector Current Ratng (A) Lmter/Fuse Style Number 0DG0 0DG0 0DG0 0DG0 0DG0 0DG0 0DG0 0C0G0 KRPC Curve Number These are the recommended lmters for use on three and four transformer spot network systems. The lmters are optonal on two transformer systems. Consult Eaton for DSL fuse curve and Bussmann for KRPC fuse curved Scale x 000 = Current n Amperes , CA0000E

25 September Sheet 0 Protector Equpment Type MPCV Protector Relay.0- Descrpton The mcroprocessor controlled network relays were desgned to replace the Type CN- electromechancal master relay, the Type CNJ electromechancal phasng relay and the Type BN electromechancal desenstzng relay. The MPCV seres relays use the same voltage and current nputs as do the electromechancal equvalent. They also contnually montor voltage across an open breaker and current through a closed breaker, and perform the followng functons. The trp contact wll close upon balanced fault condtons f the postve sequence power flow s out of the network The close contact wll close f the ensung postve sequence power wll be nto the network The trp contact wll close upon the flow of reverse magnetzng current of ts assocated transformer Warnng The MPCV relays are desgned to be used on network protectors whch have been wred for Y/V or 0Y/V servce usng relay potental transformers. Ths relay s desgned to operate at V (lne to ground). Do not attempt to apply ths relay on any other system voltage or confguraton. Trp Functon Fgure.0- dagrams the currentnduced trp characterstcs. The postve sequence current I s multpled by the cosne of the angle of ts phasor related to VN. If the resultng sgn s negatve, then reverse powerflow s ndcated. The trp level (COSØ) for ths can be adjusted from 0.0 to percent of rated current. The cosne multplcaton operaton results n the straght lne whch s perpendcular to the phasor. The MPCV seres relay wll mount on standard CM and exstng CMD and CM- network protectors utlzng the present system of low voltage relay mountng studs. MPCV Relay Exclusve Features The MPCV relay s the only sequencedbased network relay n the market. The MPCV relay calculates the fundamental frequency postve sequence voltage and current phasors to account mathematcally for any power system voltage unbalances. Essentally, the MPCV relay extracts the fundamental components of the sampled voltage and current sgnals usng dscrete Fourer Transform, then the postve sequence components are then calculated. The postve sequence current phasors for each phase are compared wth the reverse trp settng (RT n the settng menu) and a determnaton to trp s made wthn the relay. The samplng rate s samples per power lne cycle, and the algorthm requres two successve lne cycles of data to ntate a trp where the postve sequence currents experenced by the MPCV relay exceed the RT settngs. The MPCV has the followng exclusve features: Gull-Wng Trp to address hgh X/R Transformers Ant-pump algorthm Protectve remote close MPCV Relay (Front Vew) for CM Protectors Falure to follow these nstructons could result n severe personal njury, death, and/or product or property damage. Functonal Characterstcs All measurements n the relay are made as net voltages and currents, computed as the postve sequence voltage and current (represented as VX or I) and the negatve sequence voltage and current (represented as VX or I). The network postve and negatve voltages sequence are denoted VN and VN respectvely. The other mportant voltage s the phasng voltage, whch s the dfference between the transformer and network voltages, whose sequence components are denoted VP and VP. The VN s defned as the reference phasor for all phase measurements, and the nomnal phase-to-neutral voltage ( P.U.) s defned as Vac rms. From ths, the basc functonal characterstcs are graphcally depcted n Fgures.0- through.0-. Fgure.0-. Trp Characterstcs In a dfferent fault condton, the negatve sequence network voltage VN wll exceed 0.0 P.U., n whch case the trp curve s rotated 0º clockwse drecton to the alternate trp curve shown, wth the same trp level as set before (0.0 to percent). In ether case, the trp s called for after 0 ms, or three lne cycles, n a 0 Hz system, of a fault condton. The BN functon can be ntalzed to modfy the characterstcs and tmng of the reverse-current trp condtons. Ths adds to the basc detecton requrements that the true rms value of the reverse current exceeds some settable threshold between 0% and 0% of the protector CT ratng. When the magntude of the reverse current s less than the settable threshold, a trp wll occur f the condton exsts for an adjustable tme perod of 0 to mnutes. The BN functon s standard on all MPCV relays. 0 CA0000E

26 .0- Protector Equpment Type MPCV Protector Relay September Sheet 0 0 Specal Trp Characterstc Gull-Wng Trp For some applcatons, the straghtlne trp curve s not the optmum performance settng to use. If the transformers have hgh X/R ratos, then the straght-lne trp does not perform as well as the enhanced Gull-Wng trp characterstc, a feature that has been n the MPCV relay snce 0. Techncally, the followng crcumstances beneft from havng the enhanced Gull-Wng trp feature: Under a three-phase fault wth the X/R rato hgher than., the voltage to current angle s less than degrees Double lne-ground faults on the prmary of a delta-wye transformer wth blown protector fuse on one phase Sngle lne-ground fault on the prmary of grounded wye-grounded wye transformer wth blown protector fuse on one phase Close Characterstcs Fgure.0- also dagrams the voltage regons for close, float and trp operaton when the protector s open. Under extreme condtons when the protector s open, a trp s called for to prevent a dangerous manual close operaton. Wth the protector open and the network and transformer voltages normal and balanced, postve sequence phasng voltage (VP) s measured. If VP s n the close regon, the relay makes ts close contact. If VP s not n the close regon, but s less than 0.0 P.U., then the float s called for, as ths voltage dfference s not deemed dangerous regardless of the phase relatonshps, and manual close of the protector would not exceed the breaker capacty. If VP s greater than 0.0 P.U. and does not le n the close regon, then trp s called for to prevent manual closng. The relay also calls for trp under all rolled and crossed phase condtons, even when ether the transformer sde or the network sde of the protector s de-energzed. The close contact wll close only n the quadrant defned by the two lnes, termed master and phasng. The phasng lne, emanatng from 0, defnes a mnmum phase angle of the phasng voltage ahead of the network voltage for closng, whch s selectable at +,, or. The master lne sets a mnmum dfference between the transformer and network voltage, settable from to 0.0 P.U. at 0 (n phase). Ths lne exhbts a slope of.. 0º Fgure.0-. Tradtonal Relay Trp Characterstc 0º I Hgh_Lag I Hgh_Lag I Backfeed Expanded º Gull-Wng Trp Regon I Backfeed Fgure.0-. Enhanced Gull-Wng Trp Characterstc Protectve Remote Close (PRC) Feature Ths feature helps address problems wth very lghtly loaded network protectors. If a protector s opened and the system s very lghtly loaded, the users had to manually close the protector that had opened. The MPCV can be sent a PRC communcatons close command va any Eaton communcaton 0º 0º 0º V N V N 0º RT RT I TYP. Forward I TYP. Forward Non-Trp Regon RT/Tan (º) Trp Regon Non-Trp Regon RT/Tan (º) Trp Regon º Tlt º Tlt 0º 0º opton avalable. The PRC command s not an unqualfed close, rather the MPCV relay relaxes ts master lne settng to mv and the command closes the protector provded the phase voltage angle s n the wden close wndow. After closure, the MPCV relay automatcally readjusts the master lne settng back to the orgnal master lne settng confgured n the relay. CA0000E

27 September Sheet 0 Protector Equpment Communcatons Capabltes.0- Protectve Remote Close (PRC) Straght Lne Close Characterstc 0º PL PRC º Normal ML, PL Re-close Settngs Close Regon Temporary (0 sec) PRC Boundary V P ML 0º PRC V PX ~ mv 0º V N Fgure.0-. Crcular Closng Curve 0º Note: If the phases are crossed on both the transformer and the network sde, VP could be very close to or equal to zero, but the trp contact wll close as VN s less than 0. P.U. and VP s less than 0. P.U. The other closng curve characterstc opton avalable s the crcular lne closng curve whch mantans the same value of phasng volts from the to +0 quadrants (refer to Fgure.0-). The crcular closng curve permts the network protector to close at lower loads whle ensurng the watt flow s nto the network. Any close condtons must exst for 00 ms before the close contact wll close. Fgure.0-. PRC Straght Lne Close PL 0º Protectve Remote Close (PRC) Crcle Close Characterstc PRC Close Regon V P ML V PX 0º V N PL PRC ~ mv º Nornal ML, PL, PL Re-close Settngs Temporary (0 sec) PRC Boundary 0º 0 Fgure.0-. PRC Crcle Close 0º Fgure.0-. Closng Characterstcs Straght Closng If the network sde s de-energzed, and the transformer sde s energzed, the close contact wll close, f VN s less than 0. P.U., and VN s less than 0.0 P.U., and VP exceeds 0. P.U. Note that, as stated before, f VP exceeds 0. P.U., then the trp contact wll close, ndcatng crossed phases on ether the transformer sde or the network sde. Settngs All settngs can be altered through a dgtal programmng pendant whch plugs nto the unt whle mounted on the network protector breaker. When not n use, the pendant may be stored separate from any network protector locaton, most convenently wth the network protector test kt. Whle the pendant s plugged n, actual trp and close operatons wll be nhbted and the amber float lght wll flash. The pendant has a dsplay for the readout of the set ponts and a keyboard to set them. Factory default settngs are programmed nto each MPCV network relay, however, each project and protector applcaton represents dfferent voltage and loadng condtons, whch can requre adjustment of the default settngs to other approprate values. Experenced servce techncans must be used when commssonng protectors, and proper tools such as protector test sets and programmng pendants must be used to start up protectors and mantan the unts. Relay settngs can also be mplemented va PowerNet software, whch allows for the full use of the communcaton features of the MPCV network relay as descrbed on the followng pages. Non-Eaton communcaton protocols may be able to nterface wth a subnetwork of MPCV relays through a data concentrator and an ndependently wrtten and suppled drver. CA0000E

28 .0- Protector Equpment MPCV Relay Communcatons September Sheet 0 0 Control and Montorng Capabltes from MPCV Relays Proven PowerNet and Power Xpert software, developed by Eaton, provdes an operator wth the capablty to control network protectors from a personal computer whle smultaneously montorng power qualty and operatng condtons, provdng ths nformaton n real tme. PowerNet software s a user-frendly, Mcrosoft Wndows -based program that allows the operator to pont and clck through the screens. Standard software screens are approprate for most applcatons but can be customzed to meet your ndvdual requrements. Power Xpert s a Web-based nformaton gatherng system that uses only Ethernet browsers and IP addresses to dsplay data. No custom or propretary vendor software s requred. Sample Set Pont Screen Montorng PowerNet and Power Xpert provdes energy management, operatons and equpment status nformaton, and offers the operator these capabltes: Real-tme nformaton. The operator commands an nqury to each MPCV Relay on the system whch logs current, voltage, power (watts, vars and VA), energy, frequency, demand, power factor, and total harmonc dstorton (THD). Ths nformaton s dsplayed on a sngle screen Also dsplayed on ths screen s network protector nsde ar temperature. Addtonally, from the same screen, the operator can select to vew the last trp waveform or revew the MPCV Relay set ponts Data prntout. Real-tme nformaton from all MPCV Relays on any one feeder can be prnted out to provde a near nstantaneous load flow of the entre feeder Internal envronment of the network protector enclosure. Water nsde the network housng and upper copper bus temperatures. Breaker status (open/closed) Vault envronment. Transformer top ol temperature, water n the network vault, fre alarm, and network enclosure pressure Sample Montorng Screen Control PowerNet provdes multple network protectors controlled from a remote locaton and allows the followng capabltes: Close or trp the breaker relay contacts. If the operator chooses to have the breaker s relay trp contact make, the breaker openng can be vewed on-screen and lsted currents wll go to zero. A desgnedn safety feature prevents the network protector from beng closed whle the MPCV Relay trp contact s made untl the relay trp response s removed Relay set ponts. The operator can revew or change the operatonal set ponts wthout usng the hand-held controllng pendant. Password protected securty helps prevent accdental or mproper usage Alarmng Eaton software provdes the operator wth these capabltes: Receve an alarm n real tme. When an establshed parameter of a montorng functon s reached or exceeded, an alarm condton s dsplayed mmedately on the PC screen, enablng the operator to: Identfy the vault or feeder n queston Determne what alarm has been trggered and at what locaton Power Xpert s a Web-based approach to communcatons wthout propretary vendor software For more nformaton, vst the URLs below: CA0000E

29 September Sheet 0 Protector Equpment MPCV Relay Communcatons.0- Other Communcaton Protocols Eaton has ntroduced two new communcatons optons for the MPCV relay, those beng the VaultGard, and the DNP MINT. VaultGard The server s smple to connect and requres no software, only Internet Explorer. The system dsplays real tme voltage and current readngs, PF, watts, temperature, open/close status, relay set ponts and MPCV relay control-remote open and block open, protectve remote close (PRC). The devce can log up to MPCV relay data and provde MPCV reason code outputs. DNP MINT Translator VaultGard Ths devce server can dsplay up to MPCV relays on one screen. The protocol s Ethernet and/or DNP.0. Devces can be connected n varous communcaton confguratons, such as hardwred LAN or wreless, ncludng short-range wreless from module (00m), cellular modem and hot spot zone connect ablty. No software needed! wreless W-F or hardware Ethernet connecton Object trendng Operatons counter Wreless control and calbraton color coded alarms E-mal notfcaton (wth cellular, hot spot or ethernet connecton confguraton) Automatcally dscovers connected MPCVs Reason code dsplay No new relay to purchase bt securty Data loggng DNP.0, up and down lnk DNP.0 RS- DNP.0 over Ethernet DNP MINT Translator The DNP MINT allows connecton of up to devces, ncludng MPCV relays, DT0 and DT0 trp unts, DT OPTIM, DT MC, DT0, DT000, DTMV, DT0, DP-000, DIM dgtal nput module, and addressable relays. The output s DNP.0 n RS-. The DNP MINT can be confgured ether hardwred, fber optc, 00 MHz rado, or cellular. Up to MPCVs or other devces can be connected to one module RS- uplnk allows networkng multple DNP MINTs Toggle swtch controlled confguraton mode Class 0 pollng and Class,, events supported Drect operate or select and operate remote control Can be hardwred or wrelessly vewed Smple twsted par to MPCVs can be run up to 0,000 feet 0 CA0000E

30 .0-0 Protector Equpment Communcatons Confguratons September Sheet 00 Antenna Cellular DNP-RTM Seral DNP Multple MPCVs! 0 Vac Fgure.0-. Confguraton # Cellular wth DNP Power Supply Vac / Vdc Communcatons Enclosure Laptop or Pocket PC PC Twsted Par INCOM Cable Fber or Wreless RF or Ethernet or Cellular VaultGard MPCV MPCV MPCV MPCV Protector Protector Protector Protector Fgure.0-. Confguraton # Wreless Stes/Dgtal Communcaton Lnks CA0000E

31 September Sheet 0 Protector Equpment CM Protector Schematc.0-0 TB- A-0 0 TB- A- AUX b TS N 0A Connector on Relay N b AUXb øa øb øc A- N 0A N A S M P N C V TB- B- B- -CT N A- N N -ø DO Power C C C 0C A- A- N TS C M P C C V 0A S N A T CLF T TC S A N X L X CPT X L X Vac G N B- A- Trp Input B- A- J- Common TR a TR A- J- J- Close Motor Enabled OK Motor Montor IDM B- B- J- J- Col TA OK OK J- CL Close Output EL J- TA (-) TA T B- T B- T B- Transformer Customer Auxlary Breaker Contacts a b a AUX a AUX b Da Db Dc Da B- B- B- b AUX b Dc T T T a Da 0A 0A 0A b AUX b A-0 T A Dc T A S S S G T A T M P T C V T TB- MPCV Remote Trp Trp TB- L BF A- BF A- G Vac BF Close CL LS CL LS LS M CL TB- TB- TB- TB- Legend: BF- = Ant-Close/Lockout Relay CL = Close Col/Sprng Release TS = Test Swtch LS MOT = Motor Vac = Relay IDM = Indcatng Dagnostc Module TB- TB- TB- TB- TB- TA = Trp Actuator = Ext. handle Swtch a = BKR Aux(Open When Breaker Is Open) BF- = Close Relay EL = Electrcal Interlock Notes:. Trp and Lockout Provsons: for remote trp, wre external N.O. contact to poston block and poston block. must not exceed Vac/dc 0 MA. Electrcal nterlock manufactured after September of 0. See Note N.C. Dry Contacts for Montorng. 0 Fgure.0-. Typcal Schematc Dagram CM Protector 0Y/V CA0000E

32 .0- Protector Equpment Dsconnect Cabnet September Sheet 0 0 Dsconnect Cabnet Typcal Dsconnect Neutral Connecton Vsble Typcal Dsconnect wth Doors Open dsconnects are an mportant safety tem for spot network systems. Many forms of dsconnect are avalable, ncludng downstream man breakers and non-loadbreak dsconnects at the top of the network protector. Ths page descrbes the non-loadbreak product. dsconnect means on the load sde of each protector s necessary to allow safe access to the protector and protector fuses n the crcut. These fuses are on the load sde of the protector and are stll energzed from the downstream network when a gven protector s opened. Safe access to the fuses requres some form of network dsconnect means, as outlned above. Eaton recommends the use of a network dsconnect means for each protector on all spot network systems. The choce s up to the owner or desgner based upon costs and avalable space. The non-loadbreak product from Eaton s a hook-stck, gang operated mechansm. The non-loadbreak desgn allows for easer Open-Close operatons from the floor at the front of the unt compared to loadbreak desgns. The protector, not the dsconnect, s always used to break and make load current. The mechansm s behnd electrcally nterlocked cabnet doors, whch when opened, trps open the protector. Common ratngs are A, 00 Vac and below. The cabnet desgns are NEMA ndoor only. The protector has a flange at the top whch allows for the mountng of the dsconnect at the top of each respectve protector. In many cases, t s possble to locate current transformers wthn the network dsconnect cabnet to provde for forward 0/ protecton (relays mounted remotely) on the network crcuts. These relays serve to montor the crcut and trp the network protector when faults occur wthn the power crcut feedng the downstream spot network swtchgear. In some cases, t s possble to locate the protector fuses wthn the cabnet. CL Trans. Throat In. Ppe Plug () Sde Vew Pow-R-Way Busway (Flange Gasket Suppled by Busway) See Busway Drawng Four Lftng/ Drop Brackets Welded to Each Corner of Man Module Hnged Exteror Doors Cover Latch Padlock Provson on Hnged Exteror Covers Removable Cover on Fuse Housng. (.) D Lft Hole Roll Out Unt Extenson Ral Stored Locaton of Track Ext. Inspecton Wndow Eaton desgns, manufactures and tests the non-loadbreak dsconnects at the same factory that makes the network protectors, and the plant s ISO 000 certfed. Product electrcal and dmensonal coordnaton s ensured between the protectors and network dsconnects wth Eaton. Due to the mountng locaton, the network dsconnects are seated at hgh dstances from the floor and suffcent vertcal space must exst n the electrcal room to accommodate the non-loadbreak product. The load conductor cables or busway are connected at the top of each network dsconnect. The drawngs detaled on ths page depct a busway flange and connecton. When busway s used, only two flange orentatons are preferred and those algn the busway phase conductors wth the A, B, C left to rght orentaton of the protector phase conductors. Fgure.0-. Typcal 000A Non-Loadbreak Dsconnect Mounted on a Protector 0.0 All-thread rod must be used for hangng as permanent support from overhead. Dsconnect enclosure cabnet: nteror and exteror surfaces receve ANSI- Catonc Epoxy Electrocoat grey fnsh over phosphatzed gauge steel. The nteror of man module s then fnshed gloss whte. Three-pont cover latchng mechansm between the two hnged front covers. Dmensons for the neutral connecton from dsconnect cabnet to X/O on transformer must be suppled by contractor. Current transformers mounted nsde cubcle. CT rato and class per customer s specfcatons. CL CL Front Vew Protector CA0000E

33 September Sheet 0 Protector Equpment Transton Box.0- Transton Box transton boxes are used at the top of protectors when the network dsconnect takes a form other than the non-loadbreak dsconnect explaned on the prevous page. Two other forms of dsconnect are avalable, ncludng downstream man breakers and downstream fused drawout fuse trucks. Ths page descrbes the transton box product. dsconnect means on the load sde of each protector s necessary to allow safe access to the protector and protector fuses n the crcut. These fuses are on the load sde of the protector and are stll energzed from the downstream network when a gven protector s opened. Safe access to the fuses requres some form of network dsconnect means, as outlned above. Eaton recommends the use of a network dsconnect means for each protector on all spot network systems. The decson to use a man breaker or drawout fuse truck mples that the protector crcut does not use the non-loadbreak dsconnect, perhaps due to the lack of space at the top of the protector. The downstream dsconnect s usually key nterlocked wth the network protector, especally when the dsconnect s the drawout fuse truck. The area at the top of the protector becomes a transton area to connect to cables or busway. Common ratngs for transton boxes are A, 00 Vac and below. The transton box desgns are NEMA ndoor and NEMA R outdoor only. The protector has a flange at the top whch allows for the mountng of the transton box at the top of each respectve protector. In many cases t s possble to locate current transformers wthn the network transton to provde for forward 0/ protecton (relays mounted remotely) on the network crcuts. These relays serve to montor the crcut and trp the network protector when faults occur wthn the power crcut feedng the downstream spot network swtchgear. NPL Type Slver Sand Fuses CL Trans. Throat.00 (.) In. Ppe Plug () Bolt-on Front Cover Removable Fuse Housng Cover Removable Front Cover. (.) D Lft Hole Roll Out Unt Extenson Ral Stored Locaton of Track Ext. Eaton desgns, manufactures and tests transton boxes the same factory that makes the network protectors, and the plant s ISO 000 certfed. Product electrcal and dmensonal coordnaton s ensured between the protectors and transton boxes wth Eaton. The load conductor cables or busway are connected at the top of each transton box. The drawngs detaled on ths page depct a busway flange and connecton. When busway s used, several flange orentatons are preferred and those algn the busway phase conductors wth the A, B, C left to rght orentaton of the protector phase conductors. Inspecton Wndow CL Protector Eaton Bus Flange Current Transformer 0 Sde Vew Front Vew Fgure.0-0. Typcal A Transton Box Mounted on a Protector CA0000E

34 .0- Ratng Selecton Selector Gude September Sheet 0 0 Selector Gude Fgure.0- llustrates the general confguraton of the network equpment for Tables.0- through.0- equpment values. For three-unt spot networks, the fourth transformer/protector par and load L bus and load do not exst. For -unt spot networks, the thrd and fourth transformer/protector pars and load L and L buses and loads do not exst. Tables.0- through.0- are developed for systems antcpatng only one prmary feeder outage, and secondary voltage s 0 wye or wye respectvely. Table.0-. CM Protector Features Features CM Contnuous current 00 00A ratngs n amperes Operatng mechansm Sprng close Close and latch Yes ratng avalable Mechansm wthdrawal Drawout Mechancal lfe (no. ops) 0,000 Wthdrawn constructon Deadfront Protector fuse type Slver- sand NPL type Fuse locaton External Protector trp devce Shunt trp Delectrc test passed 0V UL label Yes Strongly recommended for spot network applcatons. Used optonal pre-charge energy mechansm on two transformer spot networks. NPL fuses can be mounted n epoxy enclosures or network dsconnect cabnets. Fgure.0-. Spot Confguratons Table.0-. Ratngs for Lqud Transformers 0V Secondares Lqud Transformers (Includng Ol and Slcone) OA C Rse wth % Short Tme Capacty (Up to Hours for Probable Sacrfce of % Lfe) Total TX kva Nomnal TL = Load kva (Maxmum for One PRI Outage) TX = TX kva ( C Lqud) NP = Protector Ampacty at 0V Two-Unt Spot TL = L+L and L = L = 0 TX and TX are Absent Three-Unt Spot TL = L+L+L and L = 0 TX s Absent Four-Unt Spot TL = L+L+L+L All TXs are Present LV Swtchgear Te Breaker Frame/ Trp Amperes 00/00AT 00/0AT 00/00AT 0/0AT 000/0AT 000/000AT 00/00AT 00/0AT 00/00AT 0/0AT 000/0AT 000/000AT 00/00AT 00/0AT 00/00AT 0/0AT 000/0AT 000/000AT Table.0-0. Ratngs for Dry Transformers 0V Secondares Dry-Type Transformers (Includng VPI, VPE and Cast Col) AA/FA 0 C Rse wth 0% Overload Capacty (Contnuous when Fan Coolng s Actve and Ambent s 0 C) Total TX kva Nomnal TL = Load kva (Maxmum for One PRI Outage) TX = TX kva (0 C Dry) NP = Protector Ampacty at 0V Two-Unt Spot TL = L+L and L = L = 0 TX and TX are Absent Three-Unt Spot TL = L+L+L and L = 0 TX s Absent Four-Unt Spot TL = L+L+L+L All TXs are Present LOADS L TX NP Te LOADS L TX NP Te LOADS L TX NP TL = L + L + L + L = Total Load kva Te LOADS L TX NP LV Swtchgear Te Breaker Frame/ Trp Amperes 00/000AT 00/00AT 00/00AT 0/00AT 000/0AT 000/000AT 00/000AT 00/00AT 00/00AT 0/00AT 000/0AT 000/000AT 00/000AT 00/00AT 00/00AT 0/00AT 000/0AT 000/000AT CA0000E

35 September Sheet 0 Ratng Selecton Selector Gude.0- Table.0-. Ratngs for Lqud Transformers Y or Y Secondares Lqud Transformers (Includng Ol and Slcone) OA C Rse wth % Short Tme Capacty (Up to Hours for Probable Sacrfce of % Lfe) Total TX kva Nomnal TL = Load kva (Maxmum for One PRI Outage) Two-Unt Spot TL = L+L and L = L = 0 TX and TX are Absent Three-Unt Spot TL = L+L+L and L = 0 TX s Absent Four-Unt Spot TL = L+L+L+L All TXs are Present TX = TX kva ( C Lqud) NP = Protector Ampacty at or V LV Swtchgear Te Breaker Frame/Trp Amperes For the lsted table Total Load values (TL) protector ratngs are not avalable. However, protector ratngs are avalable through 000A, whch wll support reduced TL (Total Load) values of kva, kva and kva for -, -, and -unt spot networks, respectvely at Y volt secondary (% less load values are supported f Y s the system voltage). Note: NA ndcates that spot networks are not avalable. Table.0-. Ratngs for Dry Transformers Y or Y Secondares Dry Transformers (Includng VPI, VPE and Cast Col) AA/FA 0 C Rse wth 0% Overload Capacty (Contnuous when Fan Coolng s Actve and Ambent s 0 C) Total TX kva Nomnal TL = Load kva (Maxmum for One PRI Outage) Two-Unt Spot TL = L+L and L = L = 0 TX and TX are Absent Three-Unt Spot TL = L+L+L and L = 0 TX s Absent Four-Unt Spot TL = L+L+L+L All TXs are Present TX = TX kva (0 C Dry) For the lsted table Total Load values (TL) protector ratngs are not avalable. However, protector ratngs are avalable through 000A, whch wll support reduced TL (Total Load) values of kva, kva and kva for -, -, and -unt spot networks, respectvely at Y volt secondary (% less load values are supported f Y s the system voltage). Note: NA ndcates that spot networks are not avalable NP = Protector Ampacty at or V /00AT 0/00AT 000/000AT 000/000AT 00/00AT 0/00AT 000/000AT 000/000AT 00/00AT 0/00AT 000/000AT 000/000AT LV Swtchgear Te Breaker Frame/Trp Amperes 00/00AT 0/00AT 000/000AT 000/000AT 00/00AT 0/00AT 000/000AT 000/000AT 00/00AT 0/00AT 000/000AT 000/000AT 0 CA0000E

36 .0- Ratng Selecton Protector Applcaton Informaton September Sheet 0 0 Protector Applcaton Informaton Table.0-. Transformer and Protector Combnatons and Protector Ratngs CM Protectors Transformer Protectors Transformer Nameplate kva Ratng Full Load Current rms Amperes System Voltage = Y/ or Y/ System Voltage = 0Y/ Contnuous Current Ratng rms Amperes Protector Ratng as % of Transformer Full Load Current Interruptng Ratng n rms Symmetrcal Amperes Close and Latch Ratng n rms Symmetrcal Amperes The nterruptng ratng exceeds the avalable fault current from the transformer. The short tme ratng of protectors wthout fuses equals the nterruptng ratng. Note: Use ths table and ts equpment ratngs when desgnng network systems where the protectors are rated lower or hgher, as a percentage of the full load amperes of the transformers, than those selected n the Tables.0- through.0-. Ths table s also useful when selectng equpment ratngs for systems that antcpate more than one sngle prmary outage, e.g., when two outages are expected on a four-transformer spot network ,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000 CA0000E

37 September Sheet 0 Dmensons Layout Dmensons Lqud-Type Unt Dmensons.0- Legend: SW = Prmary TX = Transformer (Slcone flled) NP = Protector ND = Dsconnect (Non-loadbreak) W All dmensons are shown n Tables.0- and.0-. (.) WT WP SW (.0) D TX ND NP DN DD Neutral ND HT SW Lqud Transformer HP HL NP TX (0.) Front HN H Fgure.0-. Lqud Unt Dmensons and Weghts, Indoor Desgn Note: Dmensons are approxmate for slcone flled network transformers and are typcal for the ratngs ndcated. Desgns can be customzed to ft nto exstng spaces n many nstances, although at hgher cost. Specfers are encouraged to consult Eaton to facltate specal exstng condtons. Table.0-. Lqud Dmensons n Inches (mm) Dmensons Refer to Plan and Front Vew Fgures Above Equpment TX NP HT HP HL HN H WT WP W DN DD D kva Amps (.) (0.) (.) (0.) 0 (.0) (.) (.) 0 (0.0) (.) (.) (.) (00.) 0 (0.0) (0.) (.) (.0) (.0) (0.) Protector selected at 0V per Table.0- recommendatons. Consult Eaton for network dsconnect nformaton. If dsconnect s remote from ths locaton, then the transton box at top of protector s nches (.0. mm) above protector flange. Table.0-. Lqud Weghts n Lb (kg) Equpment TX kva NP Amps Weghts n Lbs (kg) (.) (.0) (.) (.) (.) 0 (.0) 0 (.) 0 (.) (0.0) (.) 0 (0.0) (.) (.) (.) (.) (.) (.) (.) (.) (.) (.) (0.) 0 (0.) 0 (.0) 0 (.) (.) (0.) (.) (.) (.) (.) (.) (.) (.) Lqud Gallons (Lters) TX Protector NP Dsconnect TX 00 () 0,00 (),00 (),00 (0),000 (),000 (0,) Plan Vew 0 () 0 () 0 () 0 () 0 () 00 () 0 () 00 () 0 () 00 () Front Vew () 0 () () 00 () 00 () 00 (0) (.) (.) (.) (.) Weghts for transformers nclude the flud weght. The number of gallons of lqud ncludes the flud nsde the prmary swtch. Consult Eaton for network dsconnect nformaton. If dsconnect s remote from ths locaton, then the transton box at top of protector s nches (.0. mm) above protector flange. (0.) (.0) (.) (.0) (00.) (.) 0 CA0000E

38 .0- Layout Dmensons Dry-Type Unt Dmensons September Sheet 0 D (.) SW (0.0) W WT Dry Type Transformer TX WP ND NP Front DN DD Legend: SW = Prmary TX = Transformer (Slcone flled) NP = Protector ND = Dsconnect (Non-loadbreak) HP SW HT Dry Type Transformer TX Neutral HL ND NP (0.) Front HN H Front Plan Vew Front Vew (.) 0 Fgure.0-. Dry-Type Unt Dmensons and Weghts, Indoor Desgn Note: Dmensons and weghts are for standard VPI or VPE Dry-Type desgns, 0 C rse wth fans wth 0% contnuous overload capacty and alumnum wndngs. Copper wndngs add more weght. Prmary voltage s kv, kv BIL nsulaton. Table.0-. Dry-Type Dmensons n Inches (mm) Dmensons Refer to Plan and Front Vew Fgures Above Equpment TX NP HT HP HL HN H WT WP W DN DD D kva Amps (.0) 0 (.0) 0 (0.) 0 (.0) 0 (.0) 0 (.0) (.) (.) (.) Protector selected at 0V per Table.0-0 recommendatons. Dmensons for overall wdth nclude a bussed transton.00 nches (0.0 mm) on the prmary. Ths.00-nch (0.0 mm) secton may be elmnated by usng cable connectons to prmary bushng n leu of buswork. Consult Eaton for network dsconnect nformaton. If dsconnect s remote from ths locaton, then the transton box at top of protector s nches (.0. mm) above protector flange. Table.0-. Dry-Type Weghts n Lbs (kg) Equpment TX kva NP Amps (0.) (.) (0.0) Weghts n Lbs (kg) 0 (.0) 0 (.0) 0 (.0) 0 (.0) (.) (.) (.) (.) (.) (0.0) (.) 0 (.0) (.) (.) (.) (.) 0 (.0) 0 (0.) 0 (0.) 0 (0.) (.) 0 (0.0) (.) (.) (.) (.) (.) (0.) 0 (.0) (.0) (.0) (.) (.) (0.) (.) (.) (.) (.) (.) (.) (.) (.) (.) (.) Prmary SW + Fuses TX Protector NP + Stand ND Dsconnect 00 (0) 00 (0) 00 (0) 00 (0) 00 (0) 00 (0) 00 () 00 (0) 0 () 0,0 (0),0 (0),000 () 0 () 0 () 0 () 0 (0) 0 (0) 00 () 0 () 00 () 0 () 00 () (.) (.) (.) (.) (.) (.) Dmensons and weghts are for standard VPI or VPE Dry-Type desgns, 0 C rse wth fans wth 0% contnuous overload capacty and alumnum wndngs. Copper wndngs add more weght. Prmary voltage s kv, kv BIL nsulaton. Protector stand carres the weght of the protector, snce the dry-type end sheets do not have the strength to support the weght of the protector. Consult Eaton for network dsconnect nformaton. If dsconnect s remote from ths locaton then the transton box at top of protector s nches (.0. mm) above protector flange. CA0000E

39 September Sheet 0 Layout Dmensons Dry-Type Unt Swtchgear Mounted Protector Dmensons.0- DP (.) SW (0.0) () Dry Type Transformer TX WT W Plan Vew Front (.) - Voltage Swtchgear NP () Fgure.0-. Dry-Type Unt Dmensons and Weghts, Indoor Desgn wth Swtchgear Mounted Protector Note: Dmensons and weghts are for standard VPI or VPE Dry-Type desgns, 0 C rse wth fans wth 0% contnuous overload capacty and alumnum wndngs. Copper wndngs add more weght. Prmary voltage s kv, kv BIL nsulaton. Protector selected at 0V per Table.0-0 recommendatons. Prmary transton secton.00 nches (0.0 mm) n wdth may be elmnated by usng cable nterconnectons. Elmnaton of transton reduces wdth by.00 nches (0.0 mm). Dmensons are approxmate for low voltage swtchgear constructon. Close-couplng to swtchgear structures wth man and feeders wll requre nch (.. mm) depth dependng upon the type of feeders used, fused or nonfused. When swtchgear s remote, usng cable or busway connectons, the depth of the protector secton can be reduced to.00 nches (. mm). Table.0-. Dry-Type wth Swtchgear Mounted Protector Weghts n Lbs (kg) D Legend: = Prmary TX Dmensons and weghts are for standard VPI or VPE Dry-Type desgns, 0 C rse wth fans wth 0% contnuous overload capacty and alumnum wndngs. Copper wndngs add more weght. Prmary voltage s kv, kv BIL nsulaton. HP etwork Transformer (Slcone flled) r ND () Tr s () = Protector Structure May Be Close-Coupled To Swtchgear Wthout Transton SW HT () Dry Type Transformer TX Front Vew Swtchgear Mounted HN NP () To Swtchgear Table.0-. Dry-Type wth Swtchgear Mounted Protector Dmensons n Inches (mm) Dmensons Refer to Plan and Front Vew Fgures Above Equpment TX NP HT HP HN H WT W DP D kva Amps Equpment TX kva NP Amps (.0) 0 (.0) 0 (0.) 0 (0.) (.) (.) 0 (.0) 0 (.0) 0 (.0) 0 (.0) 0 (.0) 0 (.0) Weght n Lbs (kg) Prmary SW Includng Power Fuses 00 (0) 00 (0) 00 (0) 00 (0) 00 (0) 00 (0) (.) (.) (.) (.) (.) (.) 0 (.0) 0 (.0) 0 (0.) 0 (0.) (.) (.) Transformer TX 00 () 00 (0) 0 () 0,0 (0),0 (0),00 (0) 0 (0.) 0 (0.) 0 (0.) (.) (.) (.) (.) (.) (.) (0.) (0.) (0.) (.) (.) (.) (.) (.) (.) Low Voltage Swtchgear and Protector NP 000 () 000 () 000 () 00 () 00 () 00 () H (.) (.) (.) (.) (.) (.) 0 CA0000E

40 .0-0 September Sheet 00 Ths page ntentonally left blank. 0 CA0000E