7UT512/513 differential protection relay (Version V3) for transformers, generators, motors and short lines

Transcription

1 7UT/3 differential protection relay (Version V3) for transformers, generators, motors and short lines Scope of functions Scope of functions (see also page 9, applications) H 87H 0 * 87 * 0 7UT Fig. 7UT differential protection relays Application The 7UT/7UT3 differential protection relays are used for fast and selective isolation of short-circuits in transformers of all voltage levels and also in rotating electric machines and short lines. The particular application can be chosen by setting. In this way an optimal adaptation of the relay to the protected object can be achieved. The protection relay can be parameterized for use with three phase and single phase transformers. In addition to this, a thermal replica is integrated for the supervision of the ohmic losses in the plant. Two variants of the differential relay can be supplied: The device 7UT with a compact design is suited for two winding transformers as well as for motors or generators and short lines. A standby overcurrent time protection and two thermal monitoring functions are also integrated. The larger 7UT3 unit is used for two winding and three winding transformers, generators/motors and short two end and three end lines. Two thermal monitoring functions are integrated as additional functions. Moreover, as an alternative a standby definite time/inverse time overcurrent or a restricted earth fault (REF) or a tank protection function is available for one winding. The 7UT3 can also be used where the neutral point current of the transformer must be acquired or more inputs and outputs are required than are provided by the 7UT. The device can interface with conventional control systems or alternatively be integrated in the modern SIAUT LSA substation control system. 7UT3 Construction Within its compact construction, the device contains all the components required for capture and evaluation of measurands, operator panel and display field, alarm and command outputs, binary inputs, serial interfaces and power supply converter. The device can be supplied in three case variations. The model for panel surface mounting is supplied with two tier terminals accessible from the front. The variants for panel flush mounting or cubicle mounting have rear connection terminals and are available with or without glass cover. Mode of operation The 7UT differential protection units have a complete, digital analog value processing function ranging from sampling and digitizing the analog values to operating decisions for the circuit breaker. Digital techniques in the measurement process extensively suppress the influence of switching currents (inrushs), high frequency transients, transient DC current components and varying degrees of CT saturation. Features Short circuit protection for two and three winding transformers with integrated vector group and ratio adaptation. Restraint during inrush, overexcitation and CT saturation. Short circuit protection for generators and motors with high setting sensitivity * ote: With 60 Hz only for two winding differential function Overload protection with a thermal characteristic for windings/ terminations Two stage definite time/inverse time overcurrent standby protection for one winding. On the basis of the 7UT3 hardware, a restricted earth fault protection or a sensitive, definite time overcurrent for one starpoint (tank protection) is available as an alternative. Direct injection of two external open commands. Marshallable binary inputs, LEDs, alarm and tripping relays. Operational current measurement. Realtime clock and permanently stored operational and fault indications in the event of auxiliary voltage failure. Previous substation control interface (Siemens specific) or IEC VDEW interface (standard of the Association of German Power Utilities) up to 8 faults to the substation control and protection. Fault recording Commissioning aid. Serial interfaces The device has two serial interfaces. The operator interface for the connection of an AT compatible PC is arranged at the front. An operator program DIGSI is available for comfortable and easy setting, fault recording, evaluation and commissioning. On software version V3 and higher of the 7UT, the unit can be operated via the substation control interface using the DIGSI V3 operating program. Siemens LSA... May 996 Siemens AG 996

2 7UT/3 differential protection relay (Version V3) for transformers, generators, motors and short lines The substation control interface is a 80 nm fibre optic interface for connecting to the SIAUT LSA substation protection system or other substation control system with IEC standard interface. Alternatively this can be an isolated V./V.8 interface (RS 3C) (protocol either Siemens specific or according to IEC recommendation. K nlw Y yn0 K nlw d K nlw3 Settings All setting parameters can be input by means of the integrated operator panel and display field or a PC under user control. The parameters are stored in a non volatile memory, so that they cannot get lost even during interruption of the supply voltage. Self monitoring Hardware and software are monitored continuously and any irregularities are immediately detected and alarmed. As a result, the security, reliability and availability are significantly improved. Differential protection for transformers When the 7UT is employed as fast and selective short circuit protection for two respectively three winding transformers the following properties apply: Tripping characteristic according to Fig. 3 Vector group and ratio adaptation Depending on the treatment of the transformer neutral point, neutral current elimination can be with or without consideration of the neutral current. With the 7UT3, the neutral current at the neutral CT can be measured and considered in the treatment of this current, which increases sensitivity by one third for single pole faults. Fast clearance of heavy internal transformer faults. Restrain of inrush current with nd harmonic. Cross block function that can be limited in time. Restrain against over fluxing with a choice of 3rd or th harmonic stabilization is only active up to a settable value for the 0 Hz component of the differential current. Additional restrain for an external fault with current transformer saturation (CT saturation detector). Insensitivity to DC current elements and current transformer faults due to the freely programmable response characteristic. The differential protection function can be externally blocked by means of a binary input. Overload protection 7UT3 Overload protection Overcurrent time protection, definite/ inverse Fig. Functions of the differential protection (DMT or REF) Differential quantity DIFF 3 0, 0, DIFF Setting value m Differential protection for generators/ motors When the 7UT is employed as fast and selective short circuit protection for generators or motors the following properties apply: Tripping characteristic according to Fig. 3 Short response times within one system cycle. Monitoring of the incoming lines for wire break (for short lines). Additional restrain for external faults with current transformer saturation. Restricted earth fault protection REF Tank protection Fault characteristic with single end infeed Transformer differential protection Commissioning test I DIFF Fundamental component of the differential current I Rest Restrain current (bias current) I Rated current of the transformer, generator or line FP Fig. 3 Response characteristic with preset transformer parameters for two phase faults Trip m Restrain Rest Restrain quantity Commissioning aids The resolution of the display of the operational, restrain and differential currents is selected such that commissioning is possible using the low voltage method without additional measuring instruments. In addition to the absolute value of the operational currents, the phase angle of the currents between the windings is also displayed. Moreover, the protection function calculates the values of the differential and restrain current. Siemens LSA... May 996

3 7UT/3 differential protection relay (Version V3) for transformers, generators, motors and short lines Thermal overload protection The thermal replica evaluates the largest phase current of a selectable set of CT secondary currents. The tripping characteristics (Fig. ) are exponential functions according to IEC 8 standards and take into account the R losses due to the particular operational current and the simultaneous cooling due to the coolant. In this way the tripping time during an overload condition takes the pre load into consideration. An alarm stage can be set to operate before reaching the tripping condition. t (min) Parameters setting value time constant (min) t (min) Parameters setting value time constant (min) Backup overcurrent time protection for one winding or one end As backup protection, overcurrent time protection with a choice of definite time or inverse time characteristic is available. The definite time and inverse time protection has two stages, i.e. there is not only an overcurrent stage (>) but also a high current stage (). Both stages can be blocked via the binary input. The response value of the standby protection is derived from the measured phase currents for one winding or one end. Restricted earth fault protection (REF) Restricted earth fault protection (REF) is used with earth transformer windings or coil arrangements with a common neutral point. The winding can be more sensitively protected by the measuring principle than by differential protection because the sum of the phase currents is compared with the measured zero current. For example, the interturn fault against earth, which is hardly noticeable in the differential current, can frequently be detected by the REF. With this method, the absolute value and phase angle of the fundamental of the zero current is compared with the absolute value and phase angle of the sum of the line currents. This results in a high degree of stability during equalization processes. Tank protection monitors the current between earth and transformer tank mounted in an isolated fashion with a sensitive input winding. The response value can be set in a milliampere range. One of these functions can be set in the 7UT3 as an alternative to the standby protection. The sensitive measuring input of the tank protection is an ordering option ( in the 3th position of the order number). ote: For 60 Hz and three winding differential protection the REF and tank protection cannot be used parallel to the differential protection , 0, Without previous load k With 90 % previous load Fig. Thermal overload trip time characteristic limit = 30 0 Block REF Response value 0 0 EDS = Trip 00 0 k 0 ( 0 ; 0 ) Fig. Tripping characteristic as a function of the phase angle between 0 and 0 at 0 = 0 (80 = external fault) Siemens LSA... May 996 3

4 7UT/3 differential protection relay (Version V3) for transformers, generators, motors and short lines Marshallable event/alarm relays, LEDs, binary inputs To enable user specific indication and/or output of alarms these are supplied fully marshallable. Individual events can be grouped together to form a group alarm. Indications The 7UT provides detailed data for the analysis of faults and to check states during operations. All indications subsequently listed are backed up in the event of a supply voltage failure. Clock time The standard version contains a battery backed clock that can be synchronized via the binary input or the substation control interface. A date and time are assigned to all indications with millisecond resolution. Fault indications The last three fault indications are available for the faults stored in the unit. Operational indications All indications that are not directly associated with the fault are stored in the operational indication buffer. Fault recording The sampling values of the currents measured at the transformer are stored if a fault occurs. It is also possible to initiate fault recording on energization so that, for example, an inrush current can be recorded during commissioning. The current can be transferred to a PC or read out via the SIAUT LSA substation control and protection. If the IEC standard interface is used, up to eight fault recordings can be stored. The fault recording buffer is a ring buffer with a maximum length. The oldest fault being overwritten by each new fault. Coupling of external binary signals For the processing of external signals or commands such as reverse interlocking, Buchholz alarm, temperature limit monitoring, tank pressure switch etc. The associated events/alarms can be transmitted via the serial system interface to a central device such as for example a SIAUT LSA or a central data protection device via alarm or tripping relays and LED s for local indication. Technical data Input circuits DC voltage supply Rated current Rated frequency f, can be parameterized Overload capability current inputs, thermal Burden current inputs Rated auxiliary voltage V aux Permissible rated auxiliary voltage ranges dynamic continuous 0 s s half cycle at = A at = A Permissible max. ripple at rated auxiliary voltage Power consumption of 7UT quiescent energized of 7UT3 quiescent energized Stored energy time at V aux 0 V or A (commutable, for mixed A/ A primary CTs order a A relay) 0, 60 or 6 3 Hz x 30 x 00 x 0 x <0. VA <0. VA, 8 V or 60, 0, V or 0, 0 V 9 to 6 V 8 to V 76 to 88 V % approx. 9 W approx. W approx. 0 W approx. W 0 ms Binary inputs 7UT marshallable 7UT3 marshallable DC operating voltage Current input Alarm contacts umber of malfunction alarm relays not marshallable umber of alarm relays 7UT marshallable 7UT3 marshallable Contacts per relay Switching capacity make/break Switching voltage Permissible current LED displays Ready for operation green Internal fault red Marshallable LEDs 7UT red 7UT3 red to 0 V approx.. ma 0 see connection diagrams 0 W/VA 0 V AC/DC A 6 Siemens LSA... May 996

5 7UT/3 differential protection relay (Version V3) for transformers, generators, motors and short lines Technical data (continued) Trip contacts Serial interfaces Construction CE conformity, standards Insulation tests IEC, DI VDE 03 part 303 EMC tests; immunity (type test) Standards: IEC (product norm) E 008 (generic standard) DI VDE 03 part 303 umber of trip relays 7UT 7UT3 Contacts per relay Switching capacity Switching voltage Permissible current Operator interface Substation control interface Protocol Safety Transfer speed Type of transfer Connection or connection electric distance fibre optic marshallable marshallable make break continuous 0. s optical wave length permissible fibre damping distance Housing, dimensions Weight, terminals 7UT panel flush mounting/ cubicle mounting 7UT panel surface mounting 7UT3 panel surface mounting cubicle mounting 7UT3 panel surface mounting Degree of protection according to E 60 9 This product is in conformity with the directive of the Council of the European Communities on the approximation of the laws of the Member States relating to the electromagnetic compatibility (EMC Council Directive 89/336/EEC). The product conforms with the international standard IEC and the national standard DI VDE 7 3 /part 303. The relay is designed for use in an industrial environment, for installation in standard relay rooms and compartments such that with proper installation electro magnetic compatibility (EMC) is ensured. High voltage test (routine test), all circuits except d.c. voltage supply input High voltage test (routine test), only d.c. voltage supply input Impulse voltage test (type test), all circuits, class III High frequency IEC, class III Electrostatic discharge IEC, class III and E 6000, class III Radio frequency electromagnetic field, non modulated IEC 3 (report), class III Radio frequency electromagnetic field, amplitude modulated EV 00, class III Radio frequency electromagnetic field, puls modulated EV 0 / EV 00, class III Fast transients IEC and E 6000, class III Conducted disturbances induced by radio frequency fields, amplitude modulated EV 0, class III Power frequency magnetic field E , class IV see connection diagrams 000 W/VA 30 W/VA 0 V AC/DC A 30 A on the front, not isolated, for connection to an AT compatible PC isolated, for connection to a central unit Siemens specific or according to IEC (standard) Hamming distance d = 800, or 9 00 bauds asynchronous similar to V./V.8 to CCITT or RS3C to EIA, kv isolated max. 000 m two integrated FSMA plug connectors for fibre optic connection 80 nm max. 8 db for glass fibre 6./ m max. km 7XP0, see dimension drawings approx. 6. kg, see connection diagrams approx. 8 kg, 60 terminals approx. 0 kg, see connection diagrams approx.. kg, 00 terminals IP Conformity is proved by tests performed by Siemens AG in line with article 0 of the Council Directive in accordance with the generic standards E 008 and E 008. kv (rms), 0 Hz,8 kv DC kv (peak),,/0 s, 0, J, 3 positive and 3 negative shots at intervals of s, kv (peak), MHz, = s, 00 shots/s, duration s / 6 kv contact discharge, 8 kv air discharge, both polarities, 0 pf, R l = V/m, 7 to 00 MHz 0 V/m, 80 to 000 MHz, AM 80 %, khz 0 V/m, 900 MHz, repetition frequency 00 Hz, duty cycle 0 % kv, /0 ns, khz, burst length = ms, repetition rate 300 ms, both polarities, R l = 0 duration min 0 V, 0 khz to 80 MHz, AM 80 %, khz 30 A /m, continuous, 300 A /m for 3 s, 0 Hz Siemens LSA... May 996

6 7UT/3 differential protection relay (Version V3) for transformers, generators, motors and short lines Technical data (continued) EMC tests; emission (typ tests) Standard: E 008 (generic standard) Conducted interference voltage, auxiliary voltage CISPR, E 0, class A and DI VDE 087 part, class A Interference field strength CISPR, E 0, class A and DI VDE 087 part, class A Climatic stress tests permissible ambient temperature during service during storage during transport permissible humidity Mechanical stress tests IEC, IEC 68 Differential protection for transformers Differential protection for transformers generators, motors and short lines Overload protection permissible mechanical stress during service during transport Setting ranges Differential current DIFF >/ Steps 0.0 High current DIFF / Steps 0. Inrush stabilization f / f Steps % Overexcitation stabilization f / f Steps % Response times (single sided infeed) at DIFF. x set value DIFF > at 6 / 3 ; 0; 60 Hz at DIFF =. x set value DIFF at 6 / 3 ; 0; 60 Hz at DIFF = x set value DIFF at 6 / 3 ; 0; 60 Hz Additional time delay for tripping Steps 0.0 Reset time Drop out to pick up ratio Tolerances Tripping characteristic Inrush stabilization Additional time delay Frequency range Accuracy Setting range Differential current DIFF >/ Steps 0.0 Response times (single sided infeed) at DIFF. x set value DIFF > at 6 / 3 ; 0; 60 Hz at DIFF = x set value DIFF > at 6 / 3 ; 0; 60 Hz Reset time Drop out to pick up ratio Tolerances tripping characteristic Frequency range Accuracy at 0.8 to. f Accuracy at 0. to 0.8 or. to. f Setting ranges Factor k acc. to IEC.8 Steps 0.0 Time constant Steps 0. min Temperature alarm stage Alarm / Off Trip temperature Current dependent alarm stage Alarm 0 khz to 30 MHz 30 to 000 MHz to + C to + C to +70 C mean value per year 7 % relative humidity, on 30 days per year up to 9 % relative humidity, condensation not permissible 0 to 60 Hz, 0,03 mm amplitude 60 to 00 Hz, 0, g acceleration to 8 Hz, 7, mm amplitude 8 to 00 Hz, g acceleration 0. to 0.8 to 0 0 to 80 % 0 to 80 % (alternatively with 3 rd or th harmonic) approx. 8; 3; 3 ms approx. ; ; ms approx. ; 7; 6 ms 0 to 60 ms approx. 00 ms approx % of specified value for < 3 % of set value % or 0 ms 0.9 f/f.0 % of tripping characteristic 0.0 to approx. 70; ; approx. ; 7; to 7 ms approx. 00 ms approx % of specified value for < 0. f/f. 3 % of tripping characteristic 30 % of tripping characteristic 0. to 0. to min 70 to 00 % Alarm max = k Overcurrent time protection, setting ranges Overcurrent time protection, definite time Thermal image Drop out to pick up ratio Tolerances Frequency range Accuracy High set current phase Overcurrent phase > Delay times t >, t Tolerances Current pick up value Time Release value times pre t In (k ) / Alarm approx / Off approx / Alarm approx Class % acc. to IEC 0.9 f/f.0 % of tripping characteristic / = 0. to 30 / = 0. to 30 0 to 3 s or inactive 3% of the setting value % or 0 ms approx. 3 ms 6 Siemens LSA... May 996

7 7UT/3 differential protection relay (Version V3) for transformers, generators, motors and short lines Technical data (continued) Overcurrent time protection, setting ranges (continued) Overcurrent time protection, inverse time Overcurrent phase Time multiplier t p Energization threshold Characteristics according to IEC, Section 3.. or BS Linear measuring range Tolerances Energization threshold Timing p / = 0. to 0 0. to 3 s. x p 0 x % % for (/ p ) <0 and t p = 30 ms Setting ranges Restricted earth fault protection Response value REF / Phase angle Response time for x REF at 0; 60 Hz REF = 0.0 to 90 to 3 in steps of 0 approx. ; 7 ms Tank protection (normal) sensitive one stage definite time overcurrent for on star point CT) Response value Sensitive, normal input transformer > Response time for x response value Delay time t I > at 6 / 3 ; 0, 60 Hz 0 to 000 ma; 0. to 0 x approx. ; 0; 0 ms 0 to 60 s ote: For three winding differential protection the REF and tank protection do not work parallel to differential protection Measuring transducer/operational measurement Load currents Measuring range Tolerance Overload protection values Winding temperature Measuring range Tolerance primary secondary tertiary with 7UT3 ; ; ; ; ; ;, E, E 0 to 0 % % of rated value / Off calculated 0 to 0 % 3 % referred to Off Fault logging Storage Fault recording Max. storage time Time resolution of the Instantaneous values on the high voltage side on the low voltage side tertiary (for 7UT3) at 6 / 3; 0; 60 Hz at 6 / 3; 0; 60 Hz Up to last 8 faults ; ; ; ; ; ; E. E ; ;. s ;.66;.39 ms Siemens LSA... May 996 7

8 7UT/3 differential protection relay (Version V3) for transformers, generators, motors and short lines Selection and ordering data Order o. 7UT/3 differential protection relay 7UT B A 0 Application for Two winding transformer or machine or short two end line Two winding/three winding transformer or machine or short two /three line 3 Rated current at 0/60 Hz AC, 6 / 3 A A Rated auxiliary voltage, 8 V DC 60, 0, V DC 0, 0 V DC Construction For panel flush mounting or cubicle mounting For panel surface mounting For panel flush mounting or cubicle mounting, without glass cover Country specific presetting German/English, 0 Hz (switchable for each parameter to 6 / 3 and 60 Hz) 0 Additional functions Overcurrent time protection, two overload functions (standard on 7UT) Overcurrent time protection or restricted earth fault protection, two overload functions (standard on 7UT3) Overcurrent time protection (phase) or normal/sensitive overcurrent (earth), two times overload protection (one sensitive measuring input for 7UT3) Serial system interface Without Electric according RS 3 Fibre optic interface (80 nm) C D E 0 A B C Operating program DIGSI ) DIGSI Version V3 for Windows, full version for 0 PC s and update for 3 years, DIGSI Version V3 for Windows, demo /testversion, German English German English 7XS00 0AA00 7XS00 AA00 7XS0 0AA00 7XS0 AA00 Documentation English: Catalog LSA..: 7UT/3 (V3) Differential protection relay for transformers, generators, motors and short lines Manual: 7UT/3 (V3) umerical differential protection for transformers, generators, motors and short lines German: Katalogblatt LSA..: Differentialschutz 7UT/3 (Version V3) für Transformatoren, Generatoren, Motoren und kurze Leitungen Handbuch: Digitaler Differentialschutz 7UT/3 (Version V3) für Transformatoren, Generatoren, Motoren und kurze Leitungen Spanish Catálogo LSA..: Protección diferencial 7UT/3 (version V3) para transformadores, generadores, motores y líneas cortas E000 K7 A A 7600 C3000 G76 C99 E000 K7 A A C3000 G00 C99 E000 K7 A A 7800 ) German and English available, other languages on request. 8 Siemens LSA... May 996

9 7UT/3 differential protection relay (Version V3) for transformers, generators, motors and short lines 7UTxx xxbx 0xA0 CT Transformer CT Generator/motor Short line G/M 87T 87 G/M 87L 0/ 0/ 0/ ote: (0/) and () can freely be assigned to CT or CT of protected device. The 7UT selects the appropriate set of measured currents for each protection function depending on the above assignment. 7UT3xx xxbx xa0 CT Transformer CT CT Transformer CT CT Short line CT CT3 87 CT3 CT3 87T 87T 87L 0/ 0/ (0/) and () can freely be assigned to CT, CT or CT3. (87) and () can freely be assigned to CT, CT or CT3. (0/) and () can freely be assigned to CT, CT or CT3. 7UT3xx xxbx xa0 CT Transformer CT 0 CT3 87T (0) is available as normal/sensitive function. can freely be assigned to CT, CT or CT3. Thermal relay 0/ Two step time overcurrent relay 0 Tank protection as single step definite time overcurrent relay (optional sensitive) 87 Restricted earth fault protection 87T Transformer differential relay Fig. 6 Applications Siemens LSA... May 996 9

10 7UT/3 differential protection relay (Version V3) for transformers, generators, motors and short lines Side G Side Binary input, alarm relays, command relays and LEDs are marshallable Exciter LED Reset I >> blocking (definite/inverse time) Power supply RxD MR L+ L Version for panel surface mounting Version for panel flush mounting/cubicle mounting 3A 3A A A A Alarm relay Alarm relay A 3B 3B B Alarm relay 3 Alarm relay B B B Malfunction alarm relay Command relay 7UT Command relay 8A 8A Binary input 8A3 8A Binary input B B A A A Link with the central equipment either fibre optic or V. interface (RS 3C) kv isolated 7B 8B 6B 7B 8B 6B 7B3 8B3 6B3 7B 8B 6B 6A3 6A 6A B B3 B B A A3 A A A3 A A Device general trip Trip command DIFF > and DIFF >> Backup general trip Fault indications of the device Device operative TxD MT Fig. 7 Connection diagram for 7UT differential protection relay, with overcurrent standby and two overload functions 0 Siemens LSA... May 996

11 7UT/3 differential protection relay (Version V3) for transformers, generators, motors and short lines Side Side Side 3 i E i E LED Reset I >> blocking (definite/inverse time) User defined indication Buchholz warning Buchholz indication Binary inputs, alarm relays, command relays LEDs can be marshalled Power supply RxD L+ L MR Version for panel surface mounting Version for panel flush mounting/cubicle mounting 3A 3A A A A A 3B Alarm relay Alarm relay Alarm relay 3 3B B B B B 3D 3D C C C C D D D D 8A 8A 8A3 8A 8D 8D 8D3 8D 7D 7D B B A A A 7UT3 Binary input Binary input Binary input 3 Binary input Binary input Alarm relay Malfunction alarm relay Alarm relay 6 Alarm relay 7 Alarm relay 8 Alarm relay 9 Alarm relay 0 Alarm relay Command relay Command relay Command relay 3 Command relay Command relay Link with the central equipment either fibre optic or V. interface (RS 3C) kv isolated 7B 8B 6B 7B 8B 6B 7B3 8B3 6B3 7B 8B 6B D D D D3 3C C C C C3 3C 3C 3C3 7D 7D3 6A3 6A 6A B B3 B B A A3 A A 6D 6D3 6D 6D D D D3 D A3 A A Device general trip Trip command I DIFF > and I DIFF >> Backup general trip Fault indications of the device Device operative Overload trip, Thermal warning stage overload, Restricted earth fault trip command Tank protection trip command Buchholz warning Buchholz indication TxD MT Fig. 8 Connection diagram for 7UT3 differential protection relay with overcurrent standby and two overload functions Siemens LSA... May 996

12 7UT/3 differential protection relay (Version V3) for transformers, generators, motors and short lines Version for panel surface mounting Version for panel flush mounting/cubicle mounting E Tank protection Connection of the restricted earth fault protection is freely allocable to side, side or side 3. For ordering with normal/sensitive overcurrent earth (Pos. 3 = ) E is the sensitive input (also as tank protection). For ordering with REF or overcurrent (Pos. 3 = ) both inputs E, E are normal inputs. Restricted earth fault protection E 7 3A 3A A 6 A 3 A A 7 3B 0 3B 3 B B B B 7 3D 30 3D 8 C 3 C 0 C 3 C 3 D D 33 D 3 D 3 3A 3A 3A 6 3A3 7 8D 8 8D 9 8D 60 8D3 6 7D 6 7D I Winding I Winding I Winding I Winding I Winding I Winding I Winding 3 I Winding 3 I Winding 3 I E I E 7UT3 Binary input Binary input Binary input 3 Binary input Binary input Alarm relay Alarm relay Alarm relay 3 Alarm relay Malfunction alarm relay Alarm relay 6 Alarm relay 7 Alarm relay 8 Alarm relay 9 Alarm relay 0 Alarm relay Command relay Command relay Command relay 3 Command relay Command relay 7B 8B 6B 7B 8B 6B 7B3 8B3 6B3 7B 8B 6B D C C C C Restricted earth fault trip command 3C 96 3C 9 Tank protection trip 3C3 command 7D 7D3 3 Buchholz warning 6A3 9 6A 8 Buchholz indication 6A 7 B 7 B3 99 B 00 B 7 A 7 A3 97 A 98 A 73 6D 0 6D3 6D 3 6D D D D3 D 0 Fault indications of the device Device operative D 87 (not marshallable) D 90 D3 89 Overload trip, 3C Device general trip Trip command IDIFF> andidiff>> Standby general trip Thermal warning stage overload, Power supply 6 B B L+ L + V V B B Fibre optic 8 8 A A A V. interface (RS 3 C) Fibre optic interface Connection for the LSA 76 A 77 A3 A TxD K Fibre optic MT Connection of the restricted earth fault protection can be parameterized for different winding. 6 SV Fig. 9 Connection diagram for 7UT3 differential protection relay with restricted earth fault protection (low impedance) or sensitive/normal overcurrent (earth) Siemens LSA... May 996

13 Dimension drawings in mm Diam. or M Fibre optic connection Diam , 6 Front view Side view Panel cutout Fig. 0 7UT with housing 7XP030 (for panel flush mounting or cubicle mounting) Fibre optic connection Diam. or M.8 Diam Front view Side view Panel cutout Fig. 7UT3 with housing 7XP00 (for panel flush mounting or cubicle mounting) Cutout 0 x 60 (without paint) Detail Z: Z UT (7XP030 ) 7UT3 (7XP00 ) Front view Side view Side view Fibre optic interface Fig. 7UT/3 for panel surface mounting Siemens LSA... May 996 3

14 Conditions of Sale and Delivery Export Regulations Trademarks Dimensions Conditions of Sale and Delivery Subject to the General Conditions of Supply and Delivery for Products and Services of the Electrical and Electronic Industry and to any other conditions agreed upon with the recipients of catalogs. Export Regulations In accordance with present German and US export regulations export licences (dated 0.96) are not required for the products listed in this catalog. Export and re export are therefore The technical data, dimensions and weights are subject to change unless otherwise stated on the individual pages of this catalog. The illustrations are for reference only. permissible without the approval of the relevant authorities except where current German export regulations contain country specific restrictions. We reserve the right to adjust the prices and shall charge the price applying on the date of delivery. A 9.9 a Subject to change. Relevant are the criteria stated in the delivery note and in the invoice. An export licence may be required due to country specific application of the product. Trademarks All product designations used are trademarks or product names of Siemens AG or of other suppliers. Dimensions All dimensions in this catalog are given in mm. Siemens online! You will find Siemens Power Transmission and Distribution in the Internet: Responsible for Technical contents: orbert Schuster, Siemens AG, EV S V3, ürnberg General editing: Roland Reichel/Claudia Kühn Sutiono, Siemens AG, EV S SUP, ürnberg/ev BK, Erlangen Bereich Energieübertragung und -verteilung Geschäftsgebiet Sekundärtechnik P. O. Box 8 06 D-9006 ürnberg Siemens Aktiengesellschaft Power Transmission and Distribution Order o.: E000-K7 A-A 7600 Siemens LSA... May 996 Printed in the Federal Republic of Germany KG K SC En