Relay Selection Guide

Transcription

1 g MULTILIN GE Power Management GET-8048A Relay Selection Guide

2 INTRODUCTION Table of Content Page Introduction Baic Concept Type of Ditre Detection Mode Protection Characteritic PROTECTIVE ZONE PACKAGES Generator Motor Feeder Tranformer Bue Incoming Line GE Relay Index Reference

3 INTRODUCTION Power ditribution ytem erving indutrial or commercial facilitie repreent a variety of cot to the owner. Obviouly, the capital cot of the equipment i a concern, a i the cot of the energy which that power ytem deliver to the load which convert electrical energy to a aleable product or ervice. There are ome le obviou cot - the cot or reliability, meaured in product or ervice which cannot be old becaue power i unavailable, or an even more illuive concept, the cot of quality, which relate to cutomer atifaction. Ultimately, a the deigner of the ytem truggle with deviing a ytem arrangement and chooing equipment, he mut face the reality that no matter how clever he i, no matter how much redundancy he build into the ytem, and no matter how much he pay for premium quality component, he imply cannot build a ytem which will never fail. Thi i where ytem protection, and protective relay become important. If component failure i inevitable, then it i neceary to provide a mean of detecting thee failure. Better and fater protection afford a number of deirable attribute, all of which ultimately reult in aving the owner of the ytem money through cot avoidance. When component ditre i detected and corrected earlier, the damage aociated with the failure i minimized, which reult in lower repair cot (or even the ability to repair veru the need to replace). At the ame time, fater and more enitive detection of problem mean that the caue of the problem can be corrected while it i till a minor problem, and before it ecalate into a major catatrophe. Protection i applied on a component bai. Relay are aociated with each major component of the power ditribution ytem to detect variou form of ditre aociated with thoe component. If one of thoe relay operate (which mean that an output contact cloe becaue the relay detect a level of ditre in exce of it calibration or etting), it initiate tripping of circuit breaker or other protective device which then iolate the defective ytem component. It may be convenient to think of the circuit breaker a the mucle that doe the work of iolating the component, while the relay i the brain which decide that iolation i required. Becaue protection i aociated with component, it ha become cutomary to talk about relay which protect the component with which they are paired. While it i true that fater and more enitive protection doe reduce the amount of damage at the point of the actual fault or ditre, and in thi ene, relay which detect and de-energize defective equipment do protect their aociated component, the value of relay protection on ytem continuity i even greater. In the limit, a failed motor may have to be replaced, but good relaying on the motor will iolate the motor from the remainder of the power ditribution ytem, allowing it to continue to function and permitting the facility to continue in-ervice. Ultimately, therefore, it i ytem protection and ervice continuity that are the jutification for xgood relay protection. 1

4 BASIC CONCEPTS Zone of Protection One of the mot powerful conceptual tool available to the protection engineer i the notion of zone" a hown in Figure 1 Rather than thinking of the power ditribution ytem a unbounded, ucceful protection relie on viualizing the ytem a a collection of dicrete zone which can be individually protected uing equipment deigned to detect the unique form of abnormalitie aociated with each component. Figure 1 Zone include any circuit breaker aociated with protected equipment Aociation with a ignificant component (in thi cae, a line). Terminate at and include a circuit breaker (or other interrupter) which can repond to trip ignal from relay aociated with the zone. Repreent a minimum amount of ytem which mut be de-energized to correct a problem anywhere in the zone. Other zone could be defined to comprie bue, generator, motor, cable, etc. Figure 2 how one final requirement about thee zone - they mut overlap. Becaue protection i applied in aociation with thee defined zone, it i abolutely eential that every portion of the ytem mut fall within a zone in order to aure that there are no area which are unprotected. Figure 2 Zone mut overlap Primary and Backup Zone In pite of the bet effort of ytem deigner and protection pecialit, and depite the fact that relay have a hitorical record of being among the mot reliability component of the power ytem, the unexpected will happen. Thi ha led to the practice of auring that failure of a ingle relay can never reult in lo of protection. Thi o-called backup can exit in any of everal form: Remote Backup - in which the relay of one zone have the ability to alo detect problem in adjacent zone. Remote backup protection i the mot common practice in both indutrial and commercial application, and uually involve time delay to aure electivity. Local Backup - in which each zone i equipped with a complete et of redundant relay. Often the relay which are deignated a backup employ different meauring principle, and in more conervative cheme, may employ totally different ignal ource, and even trip different breaker uing different battery upplie. 2

5 TYPES OF DISTRESS Overcurrent Overcurrent i the term employed in the National Electrical Code to mean hort-circuit. On a healthy ytem, the flow of current i a function of the magnitude of elecrical load. A hort-circuit i a breakdown in inulation which reult in an abnormal flow of current limited only by the impedance of the electrical ditribution ytem. The ditre aociated with a hort-circuit come about becaue of the flah and arcing at the fault point, the depreion in ytem voltage aociated with the fault, and the thermal tre impoed on the conductor which mut carry fault current. Short-circuit are the focu of greatet attention in protection of medium and high voltage ytem. The change in tate from load current to hort-circuit current occur rapidly. From fundamental phyic, it i known that the magnitude of current in an inductor cannot change intantaneouly. Thi conflict can be reolved by conidering the hort-circuit current to conit of two component, a ymmetrical ac current having the higher magnitude of the hort-circuit current, and an offetting dc tranient which ha an initial magnitude equal to the initial value of the ac current and which decay rapidly. The initial magnitude of the dc tranient i directly controlled by the point on the voltage wave at which the hort-circuit occur; if the hort-circuit occur at the natural zero croing of the driving voltage inuoid, the tranient i maximized where a it i a minimum if the fault occur at the cret of the voltage inuoid. At any ubequent point in time, the magnitude of the dc tranient i determined by the time contant of the decay of the dc which i controlled by the ratio of reactance to reitance in the impedance limiting the fault. For the protection engineer, the wort cae initial current i that which include the full dc tranient. The voltage which drive a hort-circuit include ource uch a remote generator with voltage regulator that will maintain their value regardle of the preence of a hortcircuit on the ytem, a well a nearby ource whoe voltage will decay when the hort-circuit i preent. The amount of decay i determined by the nature of the ource. Nearby generator and ynchronou motor which have active excitation ytem will utain ome voltage, but ince the hort-circuit will caue their terminal voltage to drop, the current they produce will gradually be reduced a the fault i allowed to perit. At the ame time, induction motor will initially participate a hort-circuit current ource, but their voltage will decay rapidly a the trapped flux i rapidly drained. Aymmetrical fault current with decaying dc component Symmetrical fault current with ac decrement Figure illutrate how the variou element of aymmetry combine to create the mot realitic cae of the decaying ymmetrical ac current combined with the decaying dc tranient. From thi figure, it i poible to decribe a generalized hort-circuit current in the following term: High initial magnitude dc tranient component of current which decay fairly rapidly with time. High initial magnitude ymmetrical ac current which diminihe gradually with time. Symmetrical ac current lag driving voltage by a ignificant angle, approaching 90. Typical total fault current with both ac and dc decrement Figure Short-circuit current include component with both ac and dc decrement

6 Overload Overload i exactly what the term implie - exceive load demand reflected back into the power ditribution ytem. The undeirable apect of overload i purely thermal (I 2 t) heating in conductor and tranformer, related thermal abue to the power utilization equipment which interface the load to the electrical ytem. Overload i a ignificant apect of low voltage protection, but i uually not a major conideration at medium and high voltage. Open Circuit The power ditribution ytem can tolerate open circuit continuouly without harm. Where open circuit are a concern i on rotating machine - motor and generator - where they tranlate into abnormal rotor heating for which thee equipment have little tolerance. Hence, open circuit protection i frequently applied on motor and generator, and eldom on the paive portion of the ditribution ytem. Abnormal Voltage or Frequency Abnormal voltage or frequency uually i a conequence of ome form of overall ytem ditre, and while thee ymptom may appear following failure of a power ditribution ytem component, thi i uually indicative of ome undeirable conequence of that ytem failure rather than a direct reult of the failure itelf. Undervoltage can reult in overload-like thermal heating, while overvoltage can horten inulation life and accelerate inulation failure (and hort-circuit). Abnormal frequency uually i indicative of an imbalance between load and generation. DETECTION MODES Circuit - Current or Impedance Baed on the deire to array protection in logical zone, the mot common mode of protection i one which can not only detect that an abnormality (uch a a hort circuit) exit, but which can alo determine it location. The parameter which mot imply locate fault i current - hort-circuit reult in abnormal flow of current, and a relay ytem which look for high current will be able to electively detect fault. Current i the parameter which i ued in the vat majority of all protection cheme, and i ued almot excluively from 5kV down through 120V reidential ditribution. Cloely related to current detection i meaurement of apparent impedance. Apparent impedance i the ratio of voltage to current meaured at a relay location and i a direct meaure of the electrical eparation between the relay location and a point on the ytem where the voltage i depreed to zero by a hort-circuit. Impedance meaurement i more complicated than current meaurement, and hence it ue i reerved for more critical application at the higher voltage, typically above 69 kv. Sytem - Voltage or Frequency Voltage meaurement can be ued to detect that omething unuual i happening on the ytem, but generally voltage will not give any indication of the location of the problem. Hence, meaurement of voltage i uually reerved for overall ytem protection function. Likewie, frequency i an overall ytem iue. 4

7 PROTECTION CHARACTERISTICS Time Overcurrent Time overcurrent protection i the predominant form of protective relaying in medium voltage indutrial and commercial power ytem. Thi form of protection employ relay with invere time-current characteritic; that i, operating time of thee relay become le a the current magnitude increae. The baic operating characteritic trace their heritage to the natural operating characteritic of the induction dik overcurrent relay, and a a reult tatic analog and digital relay are deigned to emulated thi baic characteritic, but there i alo a noble rationale for the invere-time relationhip. Relay are intended to detect and initiate tripping of high-magnitude fault current quickly enough to avoid thermal damage to conductor, and the natural heating characteritic i alo an invere-time relationhip. Extremely invere medium time (77) - bet uited for application on utility reidential ditribution circuit where electivity with ditribution fue cutout and recloer i a requirement, and where cold load pickup i a conideration. Invere hort time (95) - bet uited for backup ground fault protection application on olidly grounded low voltage ytem where the feeder have intantaneou ground fault protection. Traditionally, the characteritic of time overcurrent relay ha been publihed in the form of graphical curve howing the dependent variable (operating time) on the vertical axi and the independent variable (operating current) on the horizontal axi. It i alo a tradition that thee curve are plotted on a pecial log-log paper. Thee tradition trace their origin to the manual practice involved in determining etting for relay. There are a number of characteritic in common ue, which are hown in Figure 4. Each of thee exit to addre pecific application need. Following i a lit of the mot common characteritic together with their uual application and alo the code number which GE ue to identify each curve hape: Invere medium time (51) - bet uited for application where the variation in the magnitude of fault current are related primarily to witching of ource on the ytem, uch a in paper mill ytem with a number of mall hydroelectric generator which are witched on and off depending on water condition. Very invere medium time (5) - bet uited for general application where the variation in the magnitude of fault current are primarily determined by ytem impedance and fault location. Thi relay characteritic i the bet choice for mot indutrial and commercial application. Invere medium-long time (57) - bet uited for application a backup ground fault protection on complex low-reitance grounded medium voltage ytem. Invere long time (66) - bet uited for overload and locked rotor protection of motor. Figure 4 Invere time characteritic of variou GE time overcurrent relay model The principle of time overcurrent protection i that relay are applied appropriately at the terminal of zone, and each relay i then given both a current pickup and a time delay etting. The current pickup etablihe the enitivity of the relay; a variety of rule dictate what thi enitivity mut be. Some of thee rule are mandatory and mut be followed; the National Electrical Code contain a number of requirement on the current etting of overcurrent relay. Other rule are embodied in application tandard, and while thee are not abolutely mandatory, they do repreent a conenu of the indutry from which mot engineer would not want to deviate. Finally, there are everal rule of thumb, or conventional practice which, through experience, have been recognized a good thing to do. 5

8 The time etting i ued to achieve elective backup protection. How thi happen i bet illutrated with characteritic curve a in Figure 5. For a fault on a feeder, the current magnitude determine the operating time of all relay. Relay which are cloet to the fault have time etting which reult in fater operation than thoe which are further away. Therefore, the primary relay which are cloet to the fault want to trip firt while the more remote backup relay wait, but if the primary relay (or their aociated circuit breaker) fail, then the backup relay time out and trip. The time margin between the etting of thee relay mut take into account three factor: The operating time of the circuit breaker. Modern medium voltage breaker are rated for 5 cycle interrupting time,and the time allowance i traditionally 0.1 econd. Overtravel, which i the tendency for a relay to continue to time after the fault current i interrupted by a downtream circuit breaker. Overtravel i a natural characteritic of the inertia of electromechanical induction dik relay, and while exact value vary widely, the traditional allowance i 0.1 econd. Mot tatic analog and digital relay are deigned to have no practical overtravel. If the backup relay ha an overtravel tendency, it time delay mut be long enough to account for that overtravel. Figure 5 Selective coordination of time overcurrent relay aume that the backup relay will alway be lower than the primary relay Margin to account for imponderable uch a the uncertaintie in the magnitude of fault current, inaccuracie in intrument tranformer, manufacturing and calibration variation in relay, etc. The amount of margin allowed depend upon how much rik the relay engineer i willing to aume; typical value range from 0.1 to 0. econd. The total coordinating time margin i the um of thee three factor and range from 0.2 to 0.5 econd; a 0. econd margin i often taken a a reaonable compromie between the objective of peed and ecurity. The chore of determining etting for an array of time overcurrent relay i time conuming work which entail making a number of engineering judgment. One mut tart cloet to the load and work toward the ource in the ytem, determining both pickup current and time delay etting for each relay in ucceion. It i not unuual to find that thi proce reult in exceively long relay operating time for fault near the ource, o it i then neceary to work back through the ytem making other judgment and introducing compromie. It ha been correctly aid that thi tak i the mot difficult and exacting work within the province of the relay engineer. The traditional approach entailed tracing relay performance curve, but the availability of computer tool eliminate ome of thi drudgery. However, even with thi automation, one mut till be prepared to focu carefully on the tak at hand and be prepared to deal with exacting detail. 6

9 Voltage Voltage protection tend to be applied to detect variou form of overall ytem ditre. The actual detection function can be either undervoltage (which operate in repone to an undeirable reduction in voltage) or overvoltage (which repond to high voltage). One of the application challenge in working with undervoltage or overvoltage relay i that normal ytem voltage encompae a range of magnitude around the nominal rated value. Furthermore, there are normal ytem condition which produce momentary excurion outide thi band of value. A a reult, the relay ued to provide thi function may be either intantaneou or time-delayed, and in the cae of time, the delay function may be either invere time or definite time. The ue of invere time delay i probably more of a tradition traceable to the hitorical ue of the induction dik technology than it i omething which i required by the application. The one ituation where an invere time delay i deirable i when a time-delayed undervoltage relay on a bu mut be elective with an invere time overcurrent relay on a feeder in repone to ytem fault. Note that while thi application i poible, it i not eay to actually do. Directionality Many imple application can be atified by relay which meaure only magnitude (of current) and time duration. However, to achieve fat, ecure, elective operation in "network" ytem which involve parallel path between ource and load, or ytem with multiple ource of fault current, the relay will alo be required to determine the direction of current flow. The baic principle ued in determining directionality i that, in a power ytem operating at unity power factor, phae current and phae-to-neutral voltage are in phae, and that phae current lead the phae-to-phae voltage between the other two conductor by 90 Figure 6. Fault current in that conductor lag it phae-to-neutral voltage by the angle of ytem impedance, θ. Therefore, the phae angle of fault current in Phae A will alway lead the angle of the B-C voltage by an angle which can never exceed 90. However, if the direction of the current in Phae A revere, then it' angle will lag the B-C voltage by up to 90. Normal current lead voltage by 90 Figure 6 Baic ytem phaor relationhip Figure 7 how a relay characteritic which utilize thi concept to determine directionality of fault current. A directional relay on Phae A ue the B-C voltage a it polarizing reference, and together they etablih a directional phaor which lead the B-C reference voltage by an angle τ which i fixed in the deign of the relay. Operation can occur if the current angle fall within 90 of the angle of the directional phaor. In mot intance, directionality i a function which i added to other relay characteritic. That i, overcurrent relay are made directional by incorporating a directionality function to the deign of the relay uch that an overcurrent meaurement can only be made if the directionality i atifactory. With induction relay, one induction unit i required for the overcurrent meaurement, while a eparate unit i ued to determine the direction of the current. Digital relay are le complex; the directional function may be a few more line of code. ä Non-operating region τ ä ä ä Figure 7 θ Directional relay directionality Directional phaor I Operating region V 7

10 Ditance The mot complex relay in common application are called ditance relay becaue they meaure the apparent impedance between the relay and the hort-circuit. The apparent impedance i meaured by computing the ratio between voltage and current at the relay. Thee relay, which are almot alway directional, are typically employed on tranmiion line where impedance i both predictable and contant. In thee application, impedance i directly proportional to phyical ditance. In fact, modern digital ditance relay have the ability to actually report thi ditance a an aid to locating the point of fault. They are alo commonly ued for generator protection, and in pecial application on motor. Ditance relay application are very different from overcurrent application; electivity i achieved by mean of enitivity (ditance etting) and time delay, but the timing function are almot alway definite time rather than invere time. A more dramatic difference i that ditance relay application technology ha it own "language", the R-X diagram a hown in Figure 8. The R-X diagram i a et of coordinate of impedance where the origin i at the relay location and impedance in the firt quadrant are in the deignated tripping direction of the impedance-meauring relay. Impedance in the third quadrant repreent hort-circuit in the non-tripping direction, while econd and fourth quadrant impedance are dynamic characteritic which are beyond the depth of thi text. Figure 8 Ditance relay characteritic hown on an R-X diagram Differential While overcurrent, voltage, ditance and directionality are powerful technique, all of them involve ome compromie between the objective of reliability, ecurity, peed, electivity and economy. Differential protection i different. It i profoundly imple, inherently ecure, highly reliable, fat, and reaonably economical. A a reult, differential protection i the mot important concept in protection. The concept i a direct extenion of Kirchoff' current law - the um of all current into a region mut be zero. Current tranformer are placed at each electrical terminal of the protected zone and wired together a indicated in Figure 9. For external fault, where fault current pae through the zone, current circulate in the current tranformer econdarie without paing through the relay. If the fault i internal to the zone, then the current introduced into the current tranformer econdarie oppoe each other and are forced to flow through the relay. The baic of a differential application include: CT at each power connection to the protected zone All ct' have the ame rating Careful attention to aure proper ct connection Differential protection i primary protection: it cannot provide backup protection for remote zone Figure 9 Baic operation of differential relay 8

11 PROTECTION PACKAGES The following protection package are organized according to the type of equipment generally encountered in medium voltage ytem. Generator, Motor, Feeder, Tranformer, Bue, and Incoming Line will be addreed. Package are baed on commonly ued power ytem configuration. Other conideration may be needed if unique power ytem arrangement are ued. 9

12 GEN GENERATOR Protective Zone (GEN1) Minimum protection for a mall machine with low reitance grounding: 86G 87G 1 1 CONTROL PACKAGE * GEN LOW RES BUS 2 (or ) RTD 50GS 49R 51GN 51V L/H B 46 * Locate thee Ct' on neutral ide of generator if no external fault ource. Device lit for GEN 1 27 Undervoltage 2 Power Direction 40 Lo of Excitation 46 Current Unbalance 49R Overload (RTD) 50GS Intantaneou Overcurrent Ground 51GN Time Overcurrent Ground 51V Time Overcurrent (V Retraint) 59 Overvoltage 64B Bu Ground Detection 81L/H Frequency 86G Lockout Auxiliary 87G Differential Qty. Device No. Decription GE Model No. Baic Package 51V Voltage-retrained Time Overcurrent Relay IFCV51AD 1 51GN Neutral Ground Overcurrent Relay DIFC or IFC5A Option 1 27 Undervoltage Relay TOV5 or IAV Revere Power Relay (detect loe over 5%) ICW51A or Revere Power Relay (detect loe below 5%) or GGP5C 1 40 Lo-of-excitation Relay CEH51A 1 46 Negative Sequence Relay SGC21C 1 49R Stator Overtemperature Relay (RTD input) IRT51E 1 50GS Ground Senor Overcurrent Relay (in place of DIFC or HFC21 51GN where ytem ground i not generator neutral) 51VC Voltage-controlled Overcurrent Relay (in place of 51V) IFCS51AD 1 59 Overvoltage Relay TOV5 or IFV71AD 1 64B Generator Ground Overvoltage Relay (in place of 51GN where generator i ungrounded) TOV5 or IFV51DD 1 81 L/H Under/Overfrequency Relay SFF202B 1 86G Lockout Auxiliary Relay HEA G Self-balancing Current Differential Relay (for connection ee MTR1A figure) or Percentage Current Differential Relay MDP or CFD22A 10

13 GEN GENERATOR Protective Zone (GEN1A) Alternate protection for a mall machine with low reitance grounding: BUS 86G 87G 1 * 40 46/49C 1 CONTROL PACKAGE GEN 2 (or ) LOW RES 50GS RTD 49R 51 51GN 51VC L/H * Locate thee Ct' on neutral ide of generator if no external fault ource. Device lit for GEN 1A 27 Undervoltage 2 Power Direction 40 Lo of Excitation 46 Current Unbalance 49R Overload (RTD) 50GS Intantaneou Overcurrent Ground 51GN Time Overcurrent (Ground) 51VC Time Overcurrent (V Control) 59 Overvoltage 81L/H Frequency 86G Lockout Auxiliary 87G Differential Qty. Device No. Decription GE Model No. Alternate Package 1 Multifunction analog relay ytem containing the following module: MID100 Multifunction Module with function: MGC 46 Negative Sequence 49C Thermal Image 51 Definite Time Overcurrent 51GN Neutral Ground Overcurrent 51VC Voltage-controlled Overcurrent Module MIC7/TOV4 Option 1 27 Undervoltage Module (into MID100 ytem) TOV5 1 2 Revere Power Module (into MID100 ytem) TCW 1 81L/H Under/Overfrequency Module (into MID100 ytem) MFF (For additional option, ee GEN1 package) 11

14 GEN GENERATOR Protective Zone (GEN2) Recommended protection for a mall machine with low/high reitance grounding: BUS 1 1 GEN 2 (or ) PROBE 50S 1 50/51GN RTD RTD GN 2 40Q 50/27 51V 60FL BF 87G 27TN O 81U 24 Output relay 6 Output relay 86G Device lit for GEN 2 12 Overpeed 24 Overexcitation, Volt/Hz 27 Undervoltage 50/27 Inadvertent generator energization 2 Revere power for anti-motoring 8 Bearing overtemperature 9 Bearing vibration (analog input) 40Q Lo of field Negative Sequence Overcurrent(I 22 t) Voltage phae reveral 49 Stator thermal (RTD and thermal model) 50BF Breaker failure detection 50S Intantaneou overcurrent (during tartup) 50/51GN Intantaneou or definite time overcurrent 51V Voltage retrained phae overcurrent 59 Overvoltage 59GN/ 100% tator ground 27TN 60FL VT fue failure detection 81 Over and underfrequency 87G Phae differential 86G Lockout Auxiliary Qty. Device No. Decription GE Model No. Baic Package 1 Multifunction microproceor-baed protection SR489 including the following function: 12 Overpeed 24 Overexcitation, Volt/Hz 27 Undervoltage 50/27 Inadvertent generator energization 2 Revere power for anti-motoring 8 Bearing overtemperature 9 Bearing vibration (analog input) 40Q Lo of field Negative Sequence Overcurrent (I 22 t) Voltage phae reveral 49 Stator thermal (RTD and thermal model) 50BF Breaker failure detection 50S Intantaneou overcurrent (during tartup) 50/51GN Intantaneou or definite time overcurrent 51V Voltage retrained phae overcurrent 59 Overvoltage 59GN/27TN 100% tator ground 60FL VT fue failure detection 81 Over and underfrequency 87G Phae differential Sequential tripping logic Trip coil uperviion Option 1 86G Lockout Relay HEA61 (For additional option, ee GEN1 package) 12

15 GEN GENERATOR Protective Zone (GEN) Minimum protection for a large machine with high reitance grounding: 64F FIELD 1 41 ** 1 BUS 21G 78 ** GEN (or 2) (or 2) 60V2 1 RTD 49R RES TO VOLT REG 21GX 81L/H 60V V G 51GN 64G1 27TN 86G Device lit for GEN 21G Ditance 21GX Aux to 21G 24 Overexcitation 27 Undervoltage 27TN Undervoltage (Third Harmonic) 2 Power Direction 40 Lo of Excitation 46 Current Unbalance 49R Overload (RTD) 51GN Time Overcurrent (Ground) 51V Time Overcurrent (V Retraint) 59 Overvoltage 60V Voltage Balance 64F Ground (field) 64G Ground (tator) 78 Out-of-tep 81L/H Frequency 86G Lockout Auxiliary 87G Differential ** If no external fault ource exit, exchange connection of protection from line ide CT' to neutral ide CT' and vice vera. Qty. Device No. Decription GE Model No. Baic Package 1 Multifunction microproceor-baed relay ytem DGP--BA 0005 including the following function: 21GX Timing auxiliary to 21G 24 Overexcitation 27 Undervoltage 27TN Third Harmonic Undervoltage 2 Revere Power (1 tep) 40 Lo-of-excitation 46 Current Unbalance (negative equence) 51GN Ground Overcurrent (backup to 64G) 51V Voltage-retrained overcurrent 59 Overvoltage 60V VT Fue Failure Detection 64G Stator Ground (95%) 81L/H Under/Overfrequency (2 etpoint each) 87G Percentage current differential Accidental energization protection Trip circuit monitoring Peronal computer communication interface, event time tagging, fault data capture Ocillography capture, time tandard I/F 1 86G Lockout Auxiliary Relay HEA61 Option 1 21G Sytem Backup Ditance Relay (in place of 51V) SLY92/SLY R Stator Overtemperature Relay (RTD) IRT51E 1 60V2 Voltage Balance Relay CFVB F Field Ground Relay PJG Out-of-tep Relay OST1000 (For additional option ee GEN1 Option) 1

16 GEN GENERATOR Protective Zone (GEN4) Recommended protection for a more important large machine with high reitance grounding: 64F FIELD 1 41 ** 1 BUS 21G 78 ** GEN (or 2) (or 2) 60V2 1 RTD 49R RES TO VOLT REG 21GX 81L/H 59 60V V G 51GN 64G1 64G2 27TN 86G Device lit for GEN 4 21G Ditance 21GX Aux to 21G 24 Overexcitation 27 Undervoltage 27TN Undervoltage (Third Harmonic) 2 Power Direction 40 Lo of Excitation 46 Current Unbalance 49R Overload (RTD) 51GN Time Overcurrent (Ground) 51V Time Overcurrent (V Retraint) 59 Overvoltage 60V Voltage Balance 64F Ground (field) 64G Ground (tator) 78 Out-of-tep 81L/H Frequency 86G Lockout Auxiliary 87G Differential ** If no external fault ource exit, exchange connection of protection from line ide CT' to neutral ide CT' and vice vera. Qty. Device No. Decription GE Model No. Baic Package 1 Multifunction microproceor-baed protection DGP--CA relay including the following function: 24 Overexcitation 27 Undervoltage Relay 27TN Third Harmonic Undervoltage 21GX Timing Auxiliary to External 21G 2 Revere Power (2 tep) 40 Lo-of-excitation 46 Current Unbalance (negative equence) 51GN Ground Overcurrent Relay 51V Voltage-retrained overcurrent 59 Overvoltage 60V VT Fue Failure Detection 64G Stator Ground (100%) (Require () main vt connected wye) 81L/H Under/Overfrequency (4/2 etpoint) 87G Percentage current differential Accidental energization protection Trip circuit monitoring Peronal computer communication interface, event time tagging, fault data capture Ocillography capture, printer I/F, time tandard I/F 1 86G Lockout Auxiliary Relay HEA61 (For option ee GEN1 and GEN Option) 14

17 MTR M O T O R Protective Zone (MTR1) Minimum protection for a mall induction motor (below 1500HP): 48 CONTROL PACKAGE BUS 62 60V GS 49R 50/51 49/50 49S/50 Device lit for MTR1 27 Time Undervoltage 47 Undervoltage and revere phae equence 48 Incomplete equence timer 49/50 Thermal overcurrent 49R Winding overtemperature (RTD) 49S/50 Time and intantaneou overcurrent (locked rotor) 50GS Intantaneou overcurrent ground 50/51 Time and intantaneou overcurrent 60V Voltage unbalance 62 Timer M RTD or Thermitor Qty. Device No. Decription GE Model No. Baic Package (Multiphae Overcurrent) 1 27 Undervoltage Relay IAV54E or TOV5 1 50/51/50GS Overload, Short Circuit and Ground Fault Relay MDP0 or 75 Firt Alternate Package (Single Phae Overcurrent) 1 27 Undervoltage Relay IAV54E or TOV5 50/51 Overload and Short Circuit Relay IFC66B or DIFC 1 50GS Ground Fault Relay HFC21 or DIFC Second Alternate Package (Multiphae Overload) 1 27 Undervoltage Relay IAV54E or TOV5 1 Microproceor-baed Motor Relay including the following function: P4A 46 Unbalance or Current-Reveral 49 Overload 49R Winding Overtemperature 50GS Ground Fault 66 Succeive Start Protection Option 1 8 Bearing Overtemperature Relay (RTD) IRT51E 1 47 Three-phae Undervoltage and Revere Phae Sequence ICR Relay (in place of 27) (Require open-delta or wye-wye voltage tranformer) 1 48 Adjutable Time Delay Relay or Timer 1 49R Winding Overtemperature Relay IRT51E 1 49S/50 Stalled Rotor Relay IFC66K 1 60V Voltage Unbalance Relay NBV11 (ue with 62 and may require harmonic filter) 1 62 Timing Auxiliary Relay SAM201 15

18 MTR M O T O R Protective Zone (MTR1A) Recommended protection for a more important mall induction motor (below 1500 HP): 86M 48 87M CONTROL PACKAGE M 62 BUS 60V / 49S/ GS 49R 86 8 () RTD (option) or Thermitor TRIP Device lit for MTR1A 27 Undervoltage 7 Undercurrent 8 Bearing Overtemperature (RTD) 46 Unbalance or current-reveral 47 Three phae undervoltage and revere phae equence 48 Adjutable definite time device or timer 49 Overload 49R Winding Overtemperature (Thermitor or RTD) 49S Locked rotor 50 Short circuit 50GS Ground fault 60V Voltage unbalance 62 Timer 66 Succeive tart 87M Differential 86,86M Lockout Auxiliary Qty. Device No. Decription GE Model No. Baic Package 1 Microproceor-baed Motor Relay including the following function: 29 or MMC 7 Undercurrent 8 Bearing Overtemperature (29 only) 46 Unbalance or Current-Reveral 49 Overload 49R Winding Overtemperature (Thermitor or RTD) (29 only) 49S Locked Rotor 50 Short Circuit 50GS Ground Fault 66 Succeive Start 86 Lockout Relay (29 only) 1 27 Undervoltage Relay TOV5 Option 1 86M Lockout Auxiliary Relay HEA M Self-balance Differential Relay HFC2 (Add if required and if poible to mount three 50/5A current tranformer at the motor.) or Percentage Differential Relay CFD22A or DTP1 (Add if required. See MTR2 figure for one-line repreentation) (For additional option ee MTR1) 16

19 MTR M O T O R Protective Zone (MTR2) Minimum protection for a large induction motor (1500 HP and above): 86M 87M CONTROL PACKAGE M 1 50GS/ 51GS 49/49S 50/51 (10) RTD 48/66 49R BUS 27/ TRIP Device lit for MTR2 27/59 Under and overvoltage 7 Undercurrent 8 Bearing Overtemperature (RTD) 46 Current unbalance 47 Undervoltage/revere phae equence 48 Incomplete equence 49 Overload 49R Winding overtemperature (RTD) 49S Locked rotor protection 50/51 Intantaneou & time overcurrent 50GS/ Intantaneou & time overcurrent 51GS ground enor 66 Succeive tart 86,86M Lockout Auxiliary 87M Differential Qty. Device No. Decription GE Model No. Baic Package 1 Digital Motor Relay including the following function: 269 Plu 27 Undervoltage (Meter Option) 7 Undercurrent 8 Bearing Overtemperature (RTD) 46 Current Unbalance 47 Voltage Phae Lo/Sequence (Meter Option) 48 Incomplete Sequence 49R Winding Overtemperature 49S Locked Rotor 49/51 Overload 50GS/51GS Ground Fault 51R Jam (Running) 59 Overvoltage (Meter Option) 66 Succeive Start 86 Lockout Relay 1 87M Differential Relay CFD22A or DTP1 1 86M Lockout Auxiliary Relay HEA61 Option (See option for MTR1 and MTR1A) 17

20 MTR M O T O R Protective Zone (MTR2A) Recommended protection for a more important large induction motor (1500 HP and above): 86M 87M CONTROL PACKAGE 1 50GS/ 51GS 49/49S 50/51 Motor 10 RTD 48/66 BUS 49R 27/ L/H Device lit for MTR2A 27/59 Under and overvoltage 7 Undercurrent 46 Current unbalance 47 Undervoltage/revere phae equence 48 Incomplete equence 49 Overload 49R Winding overtemperature (RTD) 49S Locked rotor 50/51 Intantaneou and time overcurrent 50GS/ Intantaneou and time overcurrent 51GS ground enor 66 Succeive tart 81L/H Frequency 86M Lockout Auxiliary 87M Differential Qty. Device No. Decription GE Model No. Baic Package 1 Digital Motor Relay including the following function: Undervoltage 7 Undercurrent 8 Bearing Overtemperature (RTD) 46 Current Unbalance 47 Voltage Phae Lo/Sequence 48 Incomplete Sequence 49R Winding Overtemperature 49S(26) Locked Rotor 49/51 Overload 50 Short Circuit 50GS/51GS Ground Fault 51R Jam (Running) 59 Overvoltage 66 Succeive Start 81L/H Under-and Overfrequency 87M Self-Balance Differential (for connection ee MTR1A figure) 1 86M Lock-out Auxiliary Relay HEA61 Option 1 87M Differential Relay CFD22A or DTP1 (See option for MTR1, and MTR1A) 18

21 MTR M O T O R Protective Zone (MTR) Recommended protection for a ynchronou motor in addition to that provided in preceding zone MTR1 through MTR2A: BUS Device lit for MTR 48 CONTROL PACKAGE 26F Winding Overtemperature 27DC Undervoltage 7 Undercurrent 48 Incomplete equence 50 Intantaneou overcurrent 55 Power factor 95 Reluctance Torque Sync/Re-Sync Vdc 27DC 95 MOTOR FIELD Idc 26F 7 Qty. Device No. Decription GE Model No. Baic Package 1 Microproceor-baed Synchronou Motor Relay including SPM the following function: 26F Ammortieur Winding Overtemperature (Include if field i acceible) 27DC Undervoltage Relay 7 Undercurrent 50 Short Circuit 55 Out of Step Protection/Power Factor 95 Reluctance Torque Synchronizing and Re-Synchronizing 96 Autoloading/Unloading Relay 19

22 FDR F E E D E R Protective Zone (FDR1) Standard Non-directional circuit, reidually connected ground relay: BUS 50/51 51N 50N Device lit for FDR1 50/51 Phae overcurrent and hort circuit 51N Time delay ground fault 50N Intantaneou ground fault LOAD Qty. Device No. Decription GE Model No. Baic Package 1 50/51/ Phae Overcurrent, Short Circuit and Ground Fault Relay MDP or SR75 51N or 50N Alternate Package (Single Phae Unit) 50/51 Phae Overcurrent & Short Circuit Relay DIFC or IFC5B 1 51N Time Delay Ground Fault Relay DIFC or IFC5A or 50N Intantaneou Ground Fault Relay DIFC or HFC21 Second Alternate Package 1 Multifunction microproceor-baed relay ytem DFP100 or DFP200 including the following function: or SR Undervoltage 46 Negative Sequence Overcurrent (DFP100 & 200 only) 47 Negative Sequence Voltage (SR750 only) 51 Phae Overcurrent 51N Reidual Overcurrent 59 Overvoltage 74LM High Impedance Ground (DFP200 only) 79 Recloer 81L/H Frequency Option 1 79 Recloer Relay SLR12 20

23 FDR F E E D E R Protective Zone (FDR2) Standard Non-directional circuit, with ground enor relay: BUS 50/ GS 51GS Device lit for FDR2 50/51 Phae overcurrent and hort circuit 50GS Intantaneou ground fault 51GS Time delay ground fault LOAD Qty. Device No. Decription GE Model No. Baic Package 1 50/51/ Phae Overcurrent, Short Circuit and Ground Fault Relay MDP / SR75 51GS or 50GS Alternate Package (Single Phae Unit) 50/51 Phae Overcurrent & Short Circuit Relay IFC5B / DIFCA 1 51GS Time Delay Ground Fault Relay IFC5A / DIFCA or 50GS Intantaneou Ground Fault Relay HFC21 Second Alternate Package 1 Multifunction microproceor-baed relay ytem DFP100 or DFP200 including the following function: or SR Undervoltage 46 Negative Sequence Overcurrent (DFP100 & 200 only) 47 Negative Sequence Voltage (SR750 only) 51 Phae Overcurrent 51N Reidual Overcurrent 59 Overvoltage 74LM High Impedance Ground (DFP200 only) 79 Recloer 81L/H Frequency Option 1 79 Recloer Relay SLR12 21

24 FDR F E E D E R Protective Zone (FDR) Standard Directional circuit: TRIP DIRECTION BUS 67 67N Device lit for FDR 67 Directional overcurrent and hort circuit 67N Directional time delay and intantaneou ground fault LINE/LOAD Qty. Device No. Decription GE Model No. Baic Package 1 67/67N Directional Phae and Ground Fault Relay DFP100 or (Optional recloer 79 function i included). SR750 / SR760 Alternate Package (Single Phae Unit) 67 Directional Overcurrent Relay IBC5 or JBC5 1 67N Directional Ground Fault Relay IBCG5 or JBCG5 Option 1 79 Recloer Relay SLR12 22

25 FDR F E E D E R Protective Zone (FDR4) Long line and critical hort length line: LINE 87L 86L PILOT WIRE Device lit for FDR4 87L Pilot wire line 86L Lockout auxiliary BKR 87L 86L Qty. Device No. Decription GE Model No. Baic Package 2 87L Pilot Wire Line Differential Relay SPD L Lockout Auxiliary Relay HEA61 Option 1 85LM Pilot Wire Monitor Relay (ending end) SPA LM Pilot Wire Monitor Relay (receiving end) SPA12 Alternate Package 2 87L Current Differential Relay DLS 2 86L Lockout Auxiliary Relay HEA61 2

26 TR TRANSFORMER Protective Zone (TR1) Protection for tranformer 2500KVA and below, medium and low voltage winding: M.V. 1 50/51 50GS Device lit for TR1 50/51 Overcurrent & hort circuit 50GS Ground fault L.V. Qty. Device No. Decription GE Model No. Baic Package 1 50/51/50GS Overcurrent, Short Circuit and Ground Fault Relay MDP or SR75 Alternate Package (Single Phae Unit) 50/51 Overcurrent and Short Circuit Relay DIFC or IFC5B 1 50GS Ground Fault Relay DIFC or HFC21 Second Alternate Package 1 Multifunction microproceor-baed relay ytem DFP100 or DFP200 including the following function: or SR Undervoltage 46 Negative Sequence Overcurrent (DFP100 & 200 only) 47 Negative Sequence Voltage (SR750 only) 51 Phae Overcurrent 51N Reidual Overcurrent 59 Overvoltage 74LM High Impedance Ground (DFP200 only) 81L/H Frequency 24

27 TR TRANSFORMER Protective Zone (TR2) Protection for tranformer 750kVa and above, medium voltage winding: 87T 86T 1 50/51 50GS Device lit for TR2 87T Differential 86T Lockout auxiliary 50/51 Overcurrent & hort circuit 50GS Ground fault 6 Integral fault preure 6X Fault preure auxiliary M.V. M.V. 6 * 6X *INTEGRAL TO TRANSFORMER Qty. Device No. Decription GE Model No. Baic Package 1 87T Differential Relay DTP or SR745 6X Fault Preure Auxiliary Relay X 86T Lockout Auxiliary Relay (quantity a required) HEA /51/50GS* Overcurrent, Short Circuit and Ground Fault Relay MDP Alternate Package (Single Phae Unit) 87T Differential Relay STD15C or BDD15B X 86T Lockout Auxiliary Relay (quantity a required) HEA61 50/51 Overcurrent and Short Circuit Relay IFC5B 1 50GS Ground Fault Relay HFC21 1 6X Fault Preure Auxiliary Relay HAA16B *Note: The SR745 relay include thee function. 25

28 TR TRANSFORMER Additional Tranformer Ground Protection 1 Device lit for Additional Tranformer Ground Protection 51G 87N Time overcurrent Ground differential 51G 87N 1 Aux. CT (other device) Qty. Device No. Decription GE Model No. Alternate Package (Single Phae Unit) 1 51G Time Overcurrent Relay DIFC or IFC5A 1 87N Ground Differential Relay IFD51D *Note: The SR745 digital tranformer relay include 87N. 26

29 BUS BUS Protective Zone (BUS1) Single ource, radial configuration: SOURCE 51 51N BUS Device lit for BUS1 51 Phae overcurrent 51N Ground fault FEEDER (FDR) RELAY PACKAGE FEEDER (FDR) RELAY PACKAGE Qty. Device No. Decription GE Model No. Baic Package 1 51/51N Phae Overcurrent and Ground Fault Relay MDP or SR75 Alternate Package (Single Phae Unit) 51 Phae Overcurrent Relay DIFC or IFC5A 1 51N Ground Fault Relay DIFC or IFC5A Second Alternate Package 1 Multifunction microproceor-baed relay ytem DFP100 or DFP200 including the following function: or SR Undervoltage 46 Negative Sequence Overcurrent (DFP100 & 200 only) 47 Negative Sequence Voltage (SR750 only) 51 Phae Overcurrent 51N Reidual Overcurrent 59 Overvoltage 74LM High Impedance Ground (DFP200 only) 81L/H Frequency Option 1 64 Ground Fault Relay (ungrounded ytem) TCCV 27

30 BUS BUS Protective Zone (BUS2) Multiple ource with bu tie breaker: SOURCE 51 51N 51 51N SOURCE Device lit for BUS2 51 Phae overcurrent 51N Ground fault BUS FEEDER (FDR) FEEDER (FDR) RELAY RELAY PACKAGE PACKAGE Qty. Device No. Decription GE Model No. Baic Package 1 51/51N Phae Overcurrent and Ground Fault Relay MDP or SR75 Alternate Package (Single Phae Unit) 51 Phae Overcurrent Relay DIFC or IFC5A 1 51N Ground Fault Relay DIFC or IFC5A Second Alternate Package 1 Multifunction microproceor-baed relay ytem DFP100 or DFP200 including the following function: or SR Undervoltage 46 Negative Sequence Overcurrent (DFP100 & 200 only) 47 Negative Sequence Voltage (SR750 only) 51 Phae Overcurrent 51N Reidual Overcurrent 59 Overvoltage 74LM High Impedance Ground (DFP200 only) 81L/H Frequency Option 1 64 Ground Fault Relay (ungrounded ytem) TCCV 28

31 BUS BUS Protective Zone (BUS) Single or multiple ource, with or without bu tie breaker: 87B Device lit for BUS 87B Differential BUS Qty. Device No. Decription GE Model No. Baic Package 87B Differential Relay PVD21 or SBD11 29

32 BUS BUS Protective Zone (BUS4) Multiple ource, bu tie breaker, multi-ratio CT': 87B Device lit for BUS4 87B Differential BUS Qty. Device No. Decription GE Model No. Baic Package 1 87B Differential Relay BUS1000 0

33 IL INCOMING LINE Protective Zone (IL1) Single ource incoming line (no internal generation): TO UTILITY SOURCE TO 87B 51N 51 Device lit for IL1 27 Undervoltage 51 Phae overcurrent 51N Reidual overcurrent 59 Overvoltage 81L/H Frequency L/H PLANT MAIN BUS Qty. Device No. Decription GE Model No. Baic Package 1 51/51N Phae Overcurrent and Ground Fault Relay MDP Firt Alternate Package 1 51/51N Phae and Ground Overcurrent Relay with High DFM 74LM Impedance Ground Fault Detection (Power Quality Option) Second Alternate Package 1 Multifunction microproceor-baed relay ytem DFP100 or DFP200 or including the following function: SR Undervoltage 46 Negative Sequence Overcurrent (DFP100 & 200 only) 47 Negative Sequence Voltage (SR750 only) 51 Phae Overcurrent 51N Reidual Overcurrent 59 Overvoltage 74LM High Impedance Ground (DFP200 only) 81L/H Frequency Option (Single Phae Unit) 4 51, 51N Phae/Ground Overcurrent Relay DIFC or IFC5A 1 27 Undervoltage Relay TOV or NGV 1 59 Overvoltage Relay TOV or NGV 1 81L/H Over and underfrequency Relay SFF202B or MFF1 (add if uptream auto-recloing i a concern) 1 87B Differential Relay (See Bu Protective Zone for Detail) 1

34 IL INCOMING LINE Protective Zone (IL2) Single ource incoming line via utility tranformer (no internal generation): TO UTILITY SOURCE TRANSFORMER TO 87B 51G1 51 TO TRANSFORMER NEUTRAL CT 51G2 Device lit for IL2 51 Phae overcurrent 51G-1 Ground overcurrent 51G-2 Ground overcurrent 60V Voltage unbalance 62 Timer PLANT MAIN BUS 60V 62 TO 87T 2 (or ) Qty. Device No. Decription GE Model No. Baic Package 1 51/51G Phae Overcurrent and Ground Fault (Bu) Relay MDP Firt Alternate Package 1 51/51G/ Phae and Ground Overcurrent Relay with High DFM 74LM Impedance Ground Fault Detection (Power Quality Option) Second Alternate Package 1 Multifunction microproceor-baed relay ytem DFP100 or DFP200 or including the following function: SR Undervoltage 46 Negative Sequence Overcurrent (DFP 100 & 200 only) 47 Negative Sequence Voltage (SR750 only) 51 Phae Overcurrent 51N Reidual Overcurrent 59 Overvoltage 74LM High Impedance Ground (DFP200 only) 81L/H Frequency Option (Single Phae Unit) 4 51, 51N Phae/Ground Overcurrent Relay DIFC or IFC5A 1 60V Voltage Unbalance Relay NBV11 (add if high ide fuing could reult in ingle phae of motor) 1 62 Timing Auxiliary Relay SAM201 or IAV51M 1 51G2 Ground Fault (tranformer econdary) Relay DIFC or IFC5A (add for two tep trouble-hooting for tranformer/bu ground) 1 87B and Differential Relay 87T (See Bu and Tranformer Protective Zone for Detail) (For additional option ee IL1) 2

35 IL INCOMING LINE Protective Zone (IL) Single ource incoming line with internal generation: PLANT MAIN BUS TO UTILITY SOURCE TO 87B 51 51N 87L 67 67N 86L 85 LM/TT AUX PT PILOT WIRES TO UTILITY 2 (or ) Device lit for IL 51 Phae overcurrent 51N Reidual overcurrent 67 Directional phae overcurrent 67N Directional ground overcurrent 85LM/TT Communication monitor 86L Lockout auxiliary 87L Differential Qty. Device No. Decription GE Model No. Baic Package 1 87L Pilot Wire Line Differential Relay SPD11* 1 86L Lockout Auxiliary Relay HEA /67N Directional Phae and Ground Overcurrent Relay MOR 1 51/51N Phae Overcurrent and Ground Fault Relay MDP Alternate 1 87L/85LM/ Line Differential & Channel Monitor & Tranfer DLS* 85TT Trip Auxiliary Relay 67 Directional Phae Overcurrent Relay (Single Phae Unit) IBC5 or JBC5 1 67N Directional Ground Overcurrent Relay (Single Phae Unit) IBCG5 or JBCG5 4 51, 51N Phae/Ground Overcurrent Relay (Single Phae Unit) DIFC or IFC5A Option 1 85LM Pilot Wire Monitor [different device at end SPA11A or 12A* and receive end] Relay 1 85LM/TT Pilot Wire Monitor and Tranfer Trip Auxiliary Relay SPA11B or 12B* [different device at end and receive end] 1 87B Differential Relay (See Bu Protective Zone for Detail) (For additional alternate and option ee IL1 and IL2) Note: *Mut be elected in accordance with companion relay at oppoite end of the line. Pilot wire protective auxiliarie may be required.

36 IL INCOMING LINE Protective Zone (IL4) Dual ource incoming line (dual line with internal generation & via utility tranformer): MAIN 1 TRIP DIRECTION FOR 67, 67N, 2 PLANT MAIN BUS TO UTILITY SOURCE (XFMR T1) TO 87T1 TO 87B1 51G 67N 2 (or ) B 51BN 27L TO L-N VT ON XFMR 'T1' HIGH SIDE 59L 47 59B 81L/H TIE TO MAIN BKR 2 87B1 50L TO CT ON XFMR 'T1' HIGH SIDE Device lit for IL4 27L Undervoltage 2 Power direction 47 Phae undervoltage and revere phae equence 50L Intantaneou overcurrent 51B Phae time overcurrent 51BN Reidual time overcurrent 51G Ground overcurrent 59B Overvoltage 59L Overvoltage 62 Timer 67 Directional phae overcurrent 67N Directional ground overcurrent 81L/H Frequency Qty. Device No. Decription GE Model No. Baic Package 1 67/67N Directional Phae and Ground Overcurrent Relay MOR 1 51B/51BN Phae Overcurrent (Partial Differential) and MDP Ground Fault Relay 1 51G Ground Overcurrent (for tranformer lowide) Relay DIFC Option 1 27L Line Undervoltage (tranformer highide) Relay TOV5 or NGV 1 59L Line Overvoltage (tranformer highide) Relay TOV5 or NGV (Add 27L & 59L a a mean of detecting Delta-Wye tranformer highide ground fault after utility eparation.) 1 2 Power Directional Relay (detect tranf. magnetizing current) CCP1E 1 62 Auxiliary Timing Relay SAM201 (add 2 & 62 in lieu of 27L and 59L a alternate mean of detecting ytem ground fault) 1 47 Phae Undervoltage and Revere Phae Sequence Relay ICR5A (add if required for motor bu monitoring or intertie) 1 59B Bu Overvoltage Relay (add if required for intertie) TOV5 or NGV 1 81L/H Over and Underfrequency Relay SFF202B (add for intertie or load hedding requirement) or MFF1 1 50L Intantaneou Overcurrent Relay PJC11AV or (add if highide diconnect i not rated for fault interruption) CHC11A 1 87B and 87T Differential Relay (See Bu and Tranformer Protective Zone for Detail) (For additional alternate and option ee IL1 and IL2) 4

37 RELAY INDEX MODEL DESCRIPTION DEVICE NO. MODEL DESCRIPTION DEVICE NO. 29 Small HP MV motor management relay 49/50/51(+) 269 PLUS Medium HP MV motor management relay 87(+) 469 Large HP MV motor management relay with metering 87(+) 489 Small/medium ize generator relay 87(+) 75/77 phae + ground feeder relay 50/ Tranformer management relay 87(+) 750/760 Multifunction feeder relay 50/51(+) ALPS High peed ditance relay 21(+) BDD Tranformer differential, harmonic retraint 87 BUS1000 Bu protection relay 87 CAP Power directional 2 CCP Power directional 2 CEB Phae offet MHO ditance 21, 68 CEH Lo of excitation 40 CEX57 Angle impedance 78 CEY Phae MHO ditance 21 CEY-IAC Phae ditance overcurrent 21/50/51 CEYG Ground MHO ditance 21N CFD Machine differential 87 CFV Intantaneou overvoltage 59 CFVB Voltage balance 60 CHC Intantaneou overcurrent 50 CJCG Ground directional overcurrent 67 CLPG Carrier ground 67 DAR Recloing 79 DBF Breaker failure relay 50BF DBT Breaker coil/tripping circuit uperviion relay 74 DDS Digital ditribution ytem 50/51(+) DFF Frequency relay 81 DFM Feeder monitor + hi impedance ground 51/51G/74 DFP100 Multifunction feeder relay with recloe 50/51(+) DFP200 Multifunction feeder + hi impedance ground 50/51/74(+) DGP Generator protection 87(+) DIAC Time overcurrent relay 51, 50/51 DIFC Time overcurrent relay 51, 50/51 DLP Ditance relay 21(+) DLS Current differential line protection 87(+) DSFC Time overcurrent relay 51, 50/51 DTP Tranformer protection relay 87 GCX Phae reactance ditance 21 GCY Phae MHO ditance 21 GGP Senitive power directional 2 GSY Generator out-of-tep 78 GXS Auto ync/ync check 25 HAA Annunciator auxiliary 0, 74 HEA Auxiliary lockout 86 HFA Multicontact auxiliary 86, 94 HFC Intantaneou overcurrent 50 HGA Contact auxiliary 27, 74, 94 HGA18 Recloing 79 HMA Contact auxiliary 27, 74, 94 HSA Auxiliary lockout 86 IAC Time overcurrent 51, 50/51 IAV Time over/under voltage 27, 59, 64 IBC Phae directional overcurrent 67 IBCG Ground directional overcurrent 67N ICR Undervoltage and phae equence 47 ICW Time over/underpower 2, 7 IFC Time overcurrent 51, 50/51 IFCS Time overcurrent with voltage control 51 IFCV Time overcurrent with voltage retraint 51V IFD Tranformer differential 87 IFV Time overvoltage 59, 64 IJC Current balance 46 IJD Machine differential 87 IJF Over/under frequency 81 IJS Synchronim check 25 IRT Temperature 8, 49 JBC Phae directional overcurrent 67 JBCG Ground directional overcurrent 67N JBCV Directional overcurrent, voltage retraint 67 LPS Ditance relay 21(+) MCP Capacitor bank protection 50/51(+) MDP phae + ground feeder relay 50/51 MFF Over/under frequency 81 MGC Small generator protection 46, 49, 51 MIC Overcurrent 50/51 MLJ Synchrocheck 25 MLP Three pole tripping ditance relay 21 MMC Small motor protection 49/50(+) MOR Directional overcurrent with recloing 50/51/79 MRC Thermal image 49, 50/51 MRS Tranmiion line recloing 79 NAA Pilot/ditance auxiliary 78, 85 NBT Breaker trip upervior 74 NBV Voltage balance 47, 60 NGA Contact auxiliary 94 NGV Intantaneou under/over voltage 27, 59 NLR Multi-hot recloing 79 NSR Single-hot recloing 79 OST Out-of-tep protection 78 PJC Intantaneou overcurrent 7, 50, 76 PJG Machine field ground 64 PJV Over/under voltage 27, 59 PLS Polyphae tranmiion line protection ytem 21(+) PVD Bu differential 67 SAM Time delay 2 SBA Breaker auxiliary 94 SBC Breaker backup 50BF SBD Bu differential 87 SCA Directional comparion, blocking auxiliary 85 SFF Over/underfrequency 81 SGC Negative equence overcurrent 46 SLJ Synchronim check 25 SLR Multi-hot recloing 79 SLV Over/under voltage 27, 59 SLY Phae ditance 21, 68 SLYG Ground ditance 21N, 68 SPA Pilot wire monitor 85 SPD AC pilot wire 87 SPM Synchronou motor controller 50/55/27(+) STD Tranformer differential 87 STV Overexcitation (V/Hz) 24 TCC Directional overcurrent 67 TCCV Ground fault 64 TCW Directional power 2 TLS Phae/zone tranmiion line protection ytem 21(+) TOC Overcurrent 50/51 TOV Over/under voltage 27, 59 TRS Tranmiion line recloing 79 TTS Tranformer differential 87 TYS Phae/zone tranmiion line protection ytem 21(+) ANSI DEVICE NUMBERS/DESCRIPTION 2 Time-delay 21 Ditance 25 Synchronim-check 27 Undervoltage 0 Annunciator 2 Directional power 7 Undercurrent or underpower 8 Bearing 40 Field 46 Revere-phae 47 Phae-equence voltage 49 Thermal 50 Intantaneou overcurrent 51 AC time overcurrent 59 Overvoltage 60 Voltage balance 6 Preure 64 Apparatu ground 67 AC directional overcurrent 68 Blocking 69 Permiive 74 Alarm 76 DC overcurrent 78 Out-of-tep 79 AC recloing 81 Frequency 85 Carrier or pilot-wire 86 Lock out 87 Differential 94 Tripping 5

38 REFERENCES U.S. Standard ANSI ANSI/IEEE Title Standard Dictionary of Electrical and Electronic Term Graphic Symbol for Electrical and Electronic Diagram (R1989). Y Electrical and Electronic Diagram (R1988) 4. C Electrical Power Sytem Device Function 5. C Relay and Relay Sytem Aociated with Electric Power Apparatu 6. C Guide for Protective Relaying of Utility-Conumer Interconnection Recommended Practice for Protection and Coordination (R1991) of Indutrial and Commercial Power Sytem European Standard 8. IEC-255 Protective Relay Standard Code National Electrical Code NFPA Publication 199 Book 10. Indutrial Power Sytem Handbook D.L. Beeman, Editor, McGraw-Hill Book Co., 1955 Standard may be purchaed from: American National Standard Intitute, Inc. 11 Wet 42nd Street New York, NY 1006 Intitute of Electrical and Electronic Engineer, Inc. Service Center 445 Hoe Lane Picataway, NJ National Fire Protection Aociation 1 Batterymarch Park Quincy, MA Note: IEC Standard may be purchaed from the American National Standard Intitute. 6

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40 Relay Selection Guide g MULTILIN GE Power Management UTILITY INDUSTRIAL EUROPE GE Power Management GE Multilin GEPCE 205 Great Valley Parkway 215 Anderon Avenue Avenida Pinoa 10 Malvern, PA Markham, Ontario Zamudio Vizcaya USA 1955 Canada L6E 1B Spain Tel: (610) Tel: (905) Tel: GET-8048A TCC/MPI