7UT51x Catalogue En

Differential Relays

Siemens LSA 2.2.4 . May 1996 1

Application

The 7UT512/7UT513 differential protec-tion relays are used for fast and selectiveisolation of short-circuits in transformersof all voltage levels and also in rotatingelectric machines and short lines. Theparticular application can be chosen bysetting. In this way an optimal adaptationof the relay to the protected object canbe achieved. The protection relay can beparameterized for use with three–phaseand single–phase transformers. In addi-tion to this, a thermal replica is integratedfor the supervision of the ohmic losses inthe plant. Two variants of the differentialrelay can be supplied:The device 7UT512 with a compact de-sign is suited for two–winding transform-ers as well as for motors or generatorsand short lines. A standby overcurrent–time protection and two thermal monitor-ing functions are also integrated.The larger 7UT513 unit is used for two–winding and three–winding transformers,generators/motors and short two–endand three–end lines. Two thermal moni-toring functions are integrated as addi-tional functions. Moreover, as an alterna-tive a standby definite–time/inverse–timeovercurrent or a restricted earth fault(REF) or a tank protection function isavailable for one winding. The 7UT513can also be used where the neutral pointcurrent of the transformer must be ac-quired or more inputs and outputs are re-quired than are provided by the 7UT512.The device can interface with conven-tional control systems or alternatively beintegrated in the modern SINAUT LSAsubstation control system.

Construction

Within its compact construction, thedevice contains all the componentsrequired for capture and evaluation ofmeasurands, operator panel and displayfield, alarm and command outputs, binaryinputs, serial interfaces and power supplyconverter.The device can be supplied in three casevariations. The model for panel surfacemounting is supplied with two–tier termi-nals accessible from the front. The vari-ants for panel flush mounting or cubiclemounting have rear connection terminalsand are available with or without glasscover.

Mode of operation

The 7UT51 differential protection unitshave a complete, digital analog value pro-cessing function ranging from samplingand digitizing the analog values to operat-ing decisions for the circuit–breaker. Digi-tal techniques in the measurement pro-cess extensively suppress the influenceof switching currents (inrushs), high–fre-quency transients, transient DC currentcomponents and varying degrees of CTsaturation.

Features

� Short–circuit protection for two andthree–winding transformers with inte-grated vector group and ratio adapta-tion. Restraint during inrush, overex-citation and CT–saturation.

� Short–circuit protection for generatorsand motors with high settingsensitivity

� Overload protection with a thermalcharacteristic for 2 windings/2 ter-minations

� Two–stage definite–time/inverse–timeovercurrent standby protection for onewinding. On the basis of the 7UT513hardware, a restricted earth faultprotection or a sensitive, definite timeovercurrent for one starpoint (tankprotection) is available as an alterna-tive.

� Direct injection of two external opencommands.

� Marshallable binary inputs, LEDs,alarm and tripping relays.

� Operational current measurement.� Realtime clock and permanently stored

operational and fault indications in theevent of auxiliary voltage failure. Pre-vious substation control interface(Siemens–specific) or IEC 870–5–103VDEW interface (standard of theAssociation of German Power Utilities)up to 8 faults to the substation controland protection.

� Fault recording� Commissioning aid.

Serial interfaces

The device has two serial interfaces.The operator interface for the connectionof an AT–compatible PC is arranged atthe front. An operator program DIGSI isavailable for comfortable and easy set-ting, fault recording, evaluation and com-missioning. On software version V3 andhigher of the 7UT51, the unit can be oper-ated via the substation control interfaceusing the DIGSI V3 operating program.

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

Fig. 17UT51 differential protection relays

87

87H

51

50

87

87H

87N

51

Scope of functions Scope of functions

7UT512 7UT513

* Note: With 60 Hz only fortwo–winding differentialfunction

49

(see also page 9, applications)

*

50

50N

49

*

Siemens AG 1996�

Differential Relays

Siemens LSA 2.2.4 . May 19962

The substation control interface is a 820 nm fibre–optic interface for connect-ing to the SINAUT LSA substation protec-tion system or other substation controlsystem with IEC 870–5–103 standardinterface. Alternatively this can be an iso-lated V.24/V.28 interface (RS 232C) (pro-tocol either Siemens–specific or accord-ing to IEC–870–5–103 recommendation.

Settings

All setting parameters can be input bymeans of the integrated operator paneland display field or a PC under user con-trol. The parameters are stored in a non–volatile memory, so that they cannot getlost even during interruption of the supplyvoltage.

Self monitoring

Hardware and software are monitoredcontinuously and any irregularities areimmediately detected and alarmed. As aresult, the security, reliability and avail-ability are significantly improved.

Differential protection for trans-formers

When the 7UT51 is employed as fast andselective short–circuit protection for tworespectively three–winding transformersthe following properties apply:� Tripping characteristic according to

Fig. 3� Vector group and ratio adaptation� Depending on the treatment of the

transformer neutral point, neutral cur-rent elimination can be with or withoutconsideration of the neutral current.With the 7UT513, the neutral currentat the neutral CT can be measured andconsidered in the treatment of this cur-rent, which increases sensitivity byone third for single–pole faults.

� Fast clearance of heavy internal trans-former faults.

� Restrain of inrush current with 2ndharmonic. Cross–block function thatcan be limited in time.

� Restrain against over fluxing with achoice of 3rd or 5th harmonic stabiliza-tion is only active up to a settablevalue for the 50 Hz component of thedifferential current.

� Additional restrain for an external faultwith current transformer saturation(CT–saturation detector).

� Insensitivity to DC current elementsand current transformer faults due tothe freely programmable responsecharacteristic.

� The differential protection function canbe externally blocked by means of abinary input.

Differential protection for generators/motors

When the 7UT51 is employed as fast andselective short–circuit protection for gen-erators or motors the following proper-ties 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.

Commissioning aids

The resolution of the display of the opera-tional, restrain and differential currents isselected such that commissioning is pos-sible using the low–voltage method with-out additional measuring instruments.In addition to the absolute value of theoperational currents, the phase angle ofthe currents between the windings isalso displayed. Moreover, the protectionfunction calculates the values of the dif-ferential and restrain current.


Fig. 2Functions of the differential protection (DMT or REF)

L3

L2

L1KnlW1 KnlW2 KnlW3YN yn0 d5

Overloadprotection 1

Overloadprotection 2

Overcurrent–time protec-tion, definite/

inverse

Restrictedearth–fault

protection REFTank protection

Transformer differentialprotection

Commissioning test7UT513

Fig. 3Response characteristic with preset transformer parameters for two–phase faults

5

2

3

1

4

1 2 3 4 5 6 7 8 9 10

Trip

Restrain

Fault characteristicwith single–end infeed

0,5

1

0,15

Differential quantity�DIFF�N

�DIFF�

�NSetting value

�Rest�N

Restrain quantity

m2

m1

FP

IDIFF Fundamental component of the differential currentIRest Restrain current (bias current)IN Rated current of the transformer, generator or line

Differential Relays


Thermal overload protection

The thermal replica evaluates the largestphase current of a selectable set of CTsecondary currents. The tripping charac-teristics (Fig. 4) are exponential functionsaccording to IEC 255–8 standards andtake into account the �2R losses due tothe particular operational current and thesimultaneous cooling due to the coolant.In this way the tripping time during anoverload condition takes the pre–load intoconsideration. An alarm stage can be setto operate before reaching the trippingcondition.

Backup overcurrent–time protectionfor one winding or one end

As backup protection, overcurrent–timeprotection with a choice of definite–timeor inverse–time characteristic is avail-able. The definite–time and inverse–timeprotection has two stages, i.e. there isnot only an overcurrent stage (�>) butalso a high current stage (��). Bothstages can be blocked via the binary in-put. The response value of the standbyprotection is derived from the measuredphase currents for one winding or oneend.

Restricted earth fault protection (REF)

Restricted earth fault protection (REF) isused with earth transformer windings orcoil arrangements with a common neutralpoint. The winding can be more sensi-tively protected by the measuring princi-ple than by differential protection be-cause the sum of the phase currents iscompared with the measured zero cur-rent. For example, the interturn faultagainst earth, which is hardly noticeablein the differential current, can frequentlybe detected by the REF. With thismethod, the absolute value and phaseangle of the fundamental of the zero cur-rent is compared with the absolute valueand phase angle of the sum of the linecurrents. This results in a high degree ofstability during equalization processes.Tank protection monitors the current be-tween earth and transformer tankmounted in an isolated fashion with asensitive input winding. The responsevalue can be set in a milliampere range.One of these functions can be set in the7UT513 as an alternative to the standbyprotection. The sensitive measuring inputof the tank protection is an ordering op-tion (2 in the 13th position of the ordernumber).Note: For 60 Hz and three winding differ-ential protection the REF and tank protec-tion cannot be used parallel to the differ-ential protection.


Fig. 4Thermal overload trip–time characteristic

100

10

50

20

5

3

2

1

0.5

0.3

0.2

0.1

0.05

0.031 2 3 4 5 8 10

100

50

1051

�

k � �N

100

10

50

20

5

3

2

1

0.5

0.3

0.2

0.1

0.05

0.031 2 3 4 5 8 10

100

50

10

5

1 0,50,5

Parameterssetting valuetime constant � (min)

Parameterssetting valuetime constant � (min)

Without previous load With 90 % previous load�

k � �N

t (min) t (min)

Fig. 5Tripping characteristic as a function of the phase angle between �0” and �0 ’ at �0 ” = �0 ’ (180� = external fault)

130� 120� 110� 100� 90� 80� 70� 60�

Block Trip

�limit = 130� 120�4

90�100�110�

3

2

1

�0�

�EDS

� ( �0”; �0’ )

� �0” = �1 + �2 + �3

�3

�2

�1

� �0 ’

�REF Response value

Differential Relays


Marshallable event/alarm relays, LEDs,binary inputs

To enable user specific indication and/oroutput of alarms these are supplied fullymarshallable. Individual events can begrouped together to form a group alarm.

Indications

The 7UT51 provides detailed data for theanalysis of faults and to check states dur-ing operations. All indications subse-quently listed are backed up in the eventof a supply voltage failure.� Clock time

The standard version contains a bat-tery–backed clock that can be synchro-nized via the binary input or thesubstation control interface. A dateand time are assigned to all indicationswith millisecond resolution.

� Fault indicationsThe last three fault indications areavailable for the faults stored in theunit.

� Operational indicationsAll indications that are not directlyassociated with the fault are stored inthe operational indication buffer.

Fault recording

The sampling values of the currentsmeasured at the transformer are stored ifa fault occurs. It is also possible to initi-ate fault recording on energization sothat, for example, an inrush current canbe recorded during commissioning. Thecurrent can be transferred to a PC or readout via the SINAUT LSA substation con-trol and protection. If the IEC 870–5–103standard interface is used, up to eightfault recordings can be stored. The faultrecording buffer is a ring buffer with amaximum length. The oldest fault beingoverwritten by each new fault.

Coupling of external binary signals

For the processing of external signals orcommands such as reverse interlocking,Buchholz alarm, temperature limit moni-toring, tank pressure switch etc. Theassociated events/alarms can be trans-mitted via the serial system interface toa central device such as for example aSINAUT LSA or a central data protectiondevice via alarm or tripping relays andLED’s for local indication.

Technical data

Input circuits Rated current �N

Rated frequency fN, can be parameterizedOverload capability current inputs,

thermal continuous10 s1 s

dynamic half cycleBurden current inputs at �N = 1 A

at �N = 5 A

1 or 5 A (commutable, for mixed 1 A/5 Aprimary CTs order a 5 A relay)

50, 60 or 16 2 �3 Hz

4 x �N30 x �N100 x �N250 x �N<0.1 VA<0.5 VA

DC voltage supply Rated auxiliary voltage Vaux

Permissible rated auxiliary voltage ranges

Permissible max. ripple at rated auxiliary voltagePower consumption of 7UT512 quiescent

energizedof 7UT513 quiescent

energizedStored energy time at Vaux �110 V

24, 48 V or60, 110, 125 V or220, 250 V19 to 56 V48 to 144 V176 to 288 V�12 %approx. 9 Wapprox. 11 Wapprox. 10 Wapprox. 15 W�50 ms

Binary inputs 7UT512 marshallable7UT513 marshallableDC operating voltageCurrent input

2524 to 250 Vapprox. 2.5 mA

Alarm contacts Number of malfunction alarm relays not marshallableNumber of alarm relays7UT512 marshallable7UT513 marshallableContacts per relaySwitching capacity make/breakSwitching voltagePermissible current

1

410see connection diagrams20 W/VA250 V AC/DC1 A

LED displays Ready for operation greenInternal fault redMarshallable LEDs7UT512 red7UT513 red

11

614


Differential Relays


Technical data (continued)Trip contacts Number of trip relays

7UT512 marshallable7UT513 marshallableContacts per relaySwitching capacity make

breakSwitching voltagePermissible current continuous

0.5 s

25see connection diagrams1 000 W/VA30 W/VA250 V AC/DC5 A30 A

Serial interfaces Operator interface

Substation control interfaceProtocol

SafetyTransfer speedType of transferConnection electric

distanceor connection fibre optic

optical wave lengthpermissible fibre damping

distance

on the front, not isolated, for connection toan AT compatible PCisolated, for connection to a central unitSiemens–specific or according to IEC 870–5–103 (standard)Hamming distance d = 44 800, 9 600 or 19 200 baudsasynchronoussimilar to V.24/V.28 to CCITT or RS232C toEIA, 2 kV isolatedmax. 1 000 mtwo integrated FSMA plug connectors forfibre optic connection820 nmmax. 8 dB for glass fibre62.5/125 �mmax. 2 km

Construction Housing, dimensionsWeight, terminals 7UT512 panel flush mounting/

cubicle mounting7UT512 panel surface mounting7UT513 panel surface mounting

cubicle mounting7UT513 panel surface mounting

Degree of protection according to EN 60 529

7XP20, see dimension drawingsapprox. 6.5 kg, see connection diagrams

approx. 8 kg, 60 terminalsapprox. 10 kg, see connection diagrams

approx. 11.5 kg, 100 terminalsIP 51

CE–conformity, standards This product is in conformity with the directive of the Council ofthe European Communities on the approximation of the laws ofthe Member States relating to the electromagnetic compatibility(EMC Council Directive 89/336/EEC).The product conforms with the international standard IEC 255 andthe national standard DIN VDE 57 435 /part 303.The relay is designed for use in an industrial environment, forinstallation in standard relay rooms and compartments such thatwith proper installation electro–magnetic compatibility (EMC) isensured.

Conformity is proved by tests performedby Siemens AG in line with article 10 of theCouncil Directive in accordance with thegeneric standards EN 50081–2 and EN 50082–2.

Insulation tests

IEC 255–5, DIN VDE 0435 part 303High voltage test (routine test), all circuits except d.c. voltagesupply inputHigh voltage test (routine test), only d.c. voltage supply inputImpulse voltage test (type test), all circuits, class III

2 kV (rms), 50 Hz

2,8 kV DC5 kV (peak), 1,2/50 �s, 0,5 J,3 positive and 3 negative shots at intervalsof 5 s

EMC–tests; immunity

(type test)Standards: IEC 255–22 (product norm)

EN 50082–2 (generic standard)DIN VDE 0435 part 303

High frequencyIEC 255–22–1, class IIIElectrostatic dischargeIEC 255–22–2, class III and EN 61000–4–2, class IIIRadio–frequency electromagnetic field, non–modulatedIEC 255–22–3 (report), class IIIRadio–frequency electromagnetic field, amplitude modulatedENV 50140, class IIIRadio–frequency electromagnetic field, puls modulatedENV 5014 / ENV 50204, class IIIFast transientsIEC 255–22–4 and EN 61000–4–4, class III

Conducted disturbances induced by radio–frequency fields, amplitude modulatedENV 50141, class IIIPower frequency magnetic fieldEN 61000–4–8, class IV

2,5 kV (peak), 1 MHz, � = 15 �s,400 shots/s, duration 2 s4 / 6 kV contact discharge, 8 kV air dis-charge, both polarities, 150 pF, Rl = 330 �

10 V/m, 27 to 500 MHz

10 V/m, 80 to 1 000 MHz, AM 80 %, 1 kHz

10 V/m, 900 MHz, repetition frequency 200 Hz, duty cycle 50 %2 kV, 5/50 ns, 5 kHz, burst length = 15 ms,repetition rate 300 ms, both polarities, Rl = 50 �� duration 1 min10 V, 150 kHz to 80 MHz, AM 80 %, 1 kHz

30 A /m, continuous, 300 A /m for 3 s, 50 Hz


Differential Relays


Technical data (continued)EMC–tests; emission

(typ tests)Standard: EN 50081–2 (generic standard)

Conducted interference voltage, auxiliary voltageCISPR 11, EN 55011, class A and DIN VDE 0875 part 11, class AInterference field strength CISPR 11, EN 55011, class A and DIN VDE 0875 part 11, class A

150 kHz to 30 MHz

30 to 1 000 MHz

Climatic stress tests permissible ambient temperature during serviceduring storageduring transport

permissible humidity

–5 to +55 °C–25 to +55 °C–25 to +70 °Cmean value per year �75 % relative humi-dity, on 30 days per year up to 95 % rela-tive humidity, condensation not permissible

Mechanical stress testsIEC 255–21–1, IEC 68–2

permissible mechanical stress during service

during transport

10 to 60 Hz, 0,035 mm amplitude60 to 500 Hz, 0,5 g acceleration5 to 8 Hz, 7,5 mm amplitude8 to 500 Hz, 2 g acceleration

Differential protection for transformers Setting rangesDifferential current �DIFF>/�N Steps 0.01High current �DIFF�/�N Steps 0.1Inrush stabilization �2fN/�fN Steps 1 %Overexcitation stabilization �5fN/�fN Steps 1 %

Response times (single–sided infeed)at �DIFF �1.5 x set value �DIFF> at 16 2/3; 50; 60 Hzat �DIFF = 1.5 x set value �DIFF� at 16 2/3; 50; 60 Hzat �DIFF = 5 x set value �DIFF� at 16 2/3; 50; 60 HzAdditional time delay for tripping Steps 0.01Reset timeDrop–out to pick–up ratio

TolerancesTripping characteristicInrush stabilizationAdditional time delay

Frequency rangeAccuracy

0.15 to 20.8 to 2010 to 80 %10 to 80 % (alternatively with 3rd or 4th har-monic)

approx. 85; 35; 35 ms approx. 55; 25; 25 ms approx. 25; 17; 16 ms0 to 60 msapprox. 100 msapprox. 0.7

�3 % of specified value for � <5� �N�3 % of set value�1 % or 10 ms0.95 �f/fN �1.05�1 % of tripping characteristic

Differential protection for transformersgenerators, motors and short lines

Setting rangeDifferential current �DIFF>/�N Steps 0.01

Response times (single–sided infeed)at �DIFF �1.5 x set value �DIFF> at 16 2/3; 50; 60 Hzat �DIFF = 5 x set value �DIFF> at 16 2/3; 50; 60 HzReset timeDrop–out to pick–up ratio

Tolerances tripping characteristicFrequency range

Accuracy at 0.8 to 1.2 fNAccuracy at 0.5 to 0.8 or

1.2 to 1.4 fN

0.05 to 1

approx. 70; 25; 25approx. 25; 17; 15 to 17 msapprox. 100 msapprox. 0.7�3 % of specified value for � <5 �N

0.5 �f/fN �1.4�3 % of tripping characteristic�30 % of tripping characteristic

Overload protection Setting rangesFactor k acc. to IEC 255.8 Steps 0.01Time constant � Steps 0.1 minTemperature alarm stage �Alarm/�Off Trip temperatureCurrent dependent alarm stage� �Alarm

0.1 to 40.5 to 999.9 min70 to 100 %�Alarm ��max = k � �N

Thermal image t � �In�2 – �2

pre

�2 –(k � �N)2

Drop–out to pick–up ratio

TolerancesFrequency range

Accuracy

�/�Alarm approx. 0.99�/�Off approx. 0.99�/�Alarm approx. 0.99Class 5 % acc. to IEC0.95 �f/fN �1.05�1 % of tripping characteristic

Overcurrent–time protection, settingranges

Overcurrent–time protection, definite time

High set current phase ��Overcurrent phase �>Delay times t�>, t��Tolerances

Current pick–up valueTimeRelease value times

�/�N = 0.1 to 30�/�N = 0.1 to 300 to 32 s or inactive

� 3% of the setting value� 1% or � 10 msapprox. 35 ms


Differential Relays


Technical data (continued)Overcurrent–time protection, settingranges (continued)

Overcurrent–time protection, inverse time

Overcurrent phaseTime multiplier tpEnergization thresholdCharacteristics according to IEC 255–4, Section 3.5.2 or BS142

Linear measuring rangeTolerancesEnergization thresholdTiming

�p/�N = 0.1 to 200.5 to 32 s1.1 x �p

40 x �N� 5%� 5% for 2 (�/�p) <20 and tp = 130 ms

Setting rangesRestricted earth–fault protection Response value �REF/�N

Phase angleResponse time for 5 x �REF at 50; 60 Hz

�REF = 0.05 to 290 to 135� in steps of 10�approx. 25; 17 ms

Tank protection (normal)

sensitive one stage definite time overcurrent for on star–point CT)

Response valueSensitive, normal input transformer �>

Response time for 5 x response value at 16 2/3; 50, 60 HzDelay time tI>

Note: For three winding differential protection the REF and tankprotection do not work parallel to differential protection

10 to 1000 mA; 0.1 to 10 x �N

approx. 25; 20; 20 ms0 to 60 s

Measuring transducer/operationalmeasurement

Load currents primarysecondarytertiary with 7UT513

Measuring rangeTolerance

Overload protection valuesWinding temperatureMeasuring rangeTolerance

�L1; �L2; �L3�L1; �L2; �L3�L1; �L2; �L3, �E1, �E20 to 240 % �N�2 % of rated value

�/�Off calculated0 to 240 %�3 % referred to �Off

Fault logging StorageFault recording on the high–voltage side

on the low–voltage sidetertiary (for 7UT513)

Max. storage time at 16 2/3; 50; 60 HzTime resolution of the Instantaneous values at 16 2/3; 50; 60 Hz

Up to last 8 faults�L1; �L2; �L3�L1; �L2; �L3�L1; �L2; �L3 �E1. �E215; 5; 4.1 s

5; 1.66; 1.39 ms


Differential Relays


Selection and ordering data

Order No.7UT512/513 differential protection relay 7UT51 � � – � � B � 1 – � � A 0

Application forTwo–winding transformer or machine or short two–end lineTwo–winding/three–winding transformer or machine or short two–/three–line

23

Rated current at 50/60 Hz AC, 16 2/31 A5 A

15

Rated auxiliary voltage24, 48 V DC60, 110, 125 V DC220, 250 V DC

245

ConstructionFor panel flush mounting or cubicle mountingFor panel surface mountingFor panel flush mounting or cubicle mounting, without glass cover

CDE

Country–specific presettingGerman/English, 50 Hz (switchable for each parameter to 16 2/3 and 60 Hz) 0

Additional functionsOvercurrent–time protection, two overload functions (standard on 7UT512)Overcurrent–time protection or restricted earth–fault protection, two overload functions (standard on 7UT513)Overcurrent–time protection (phase) or normal/sensitive overcurrent (earth), two times overload protection (one sensitive measuring input for 7UT513)

01

2

Serial system interfaceWithoutElectric according RS 232Fibre optic interface (820 nm)

ABC

Operating program DIGSI 1)

DIGSI Version V3 for Windows, full version for 10 PC’s and update for 3 years, GermanEnglish

7XS5020–0AA007XS5020–1AA00

DIGSI Version V3 for Windows, demo–/testversion, GermanEnglish

7XS5021–0AA007XS5021–1AA00

Documentation

English: Catalog LSA 2.2.4: 7UT512/513 (V3) Differential protection relay for transformers, generators, motors and short linesManual: 7UT512/513 (V3) Numerical differential protection for transformers, generators, motors and short lines

E50001–K5722–A141–A2–7600

C53000–G1176–C99–2

German: Katalogblatt LSA 2.2.4: Differentialschutz 7UT512/513 (Version V3) für Transformatoren, Generatoren,Motoren und kurze LeitungenHandbuch: Digitaler Differentialschutz 7UT512/513 (Version V3) für Transformatoren, Generatoren,Motoren und kurze Leitungen

E50001–K5722–A141–A2

C53000–G1100–C99–2

Spanish Catálogo LSA 2.2.4: Protección diferencial 7UT512/513 (version V3) para transformadores, generadores, motores y líneas cortas

E50001–K5722–A141–A2–7800

1) German and English available, other languages on request.


Differential Relays



Fig. 6Applications

49

50/51 49

87T

49

50/51 49

87 G/M

G/M

Generator/motorTransformerCT2CT1

49

50/51 49

87L

Short line

Note:

(50/51) and (49) can freely be assigned to CT1 or CT2 of protected device. The 7UT512 selects the appropriate set of measured currents for eachprotection function depending on the above assignment.

49

50/51 49

87T

TransformerCT2CT1

CT3

49 49

87T

TransformerCT2CT1

CT387N

(50/51) and (49) can freely be assigned toCT1, CT2 or CT3.

(87N) and (49) can freely be assigned toCT1, CT2 or CT3.

49

87L

CT2CT1

CT3

(50/51) and (49) can freely be assignedto CT1, CT2 or CT3.

87T

TransformerCT2CT1

CT3

50N

(50N) is available as normal/sensitive function.49 can freely be assigned to CT1, CT2 or CT3.

49

7UT512xx–xxBx–0xA0



Short line

49

50/51

49

49 Thermal relay

50/51 Two step time overcurrent relay

50N Tank protection as single step definite timeovercurrent relay (optional sensitive)

87N Restricted earth fault protection

87T Transformer differential relay

Differential Relays



Fig. 7Connection diagram for 7UT512 differential protection relay, with overcurrent standby and two overload functions

L1 L2 L3

L1 L2 L3

NN

NN

L1 L2 L3

L1 L2 L3

L1L2

L3

G

Bin

ary

inpu

t, a

larm

rela

ys,

com

man

d re

lays

and

LE

Ds

are

mar

shal

labl

e

L2L3

L1L2

L3L1

Vers

ion

for p

anel

sur

face

mou

ntin

g

L+ L–P

ower

sup

ply

>>

blo

ckin

g

LED

Res

et

Exc

iter

L1 L2 L3 N L1 L2 L3 N

Ala

rm re

lay

1

Ala

rm re

lay

2

Ala

rm re

lay

3

Ala

rm re

lay

4

Mal

func

tion

alar

m

Vers

ion

for p

anel

flus

h m

ount

ing/

cubi

cle

mou

ntin

g

3A1

3A2

2A1

2A2

1A1

1A2

3B1

3B2

2B1

2B2

1B1

1B2

7B1

8B1

6B1

7B2

8B2

6B2

7B3

8B3

6B3

7B4

8B4

6B4

6A3

6A1

6A2

39 38 37 42 41 40 45 44 43 57 56 55 60 59 58

5B1

5B3

5B4

5B2

5A1

5A3

5A4

5A2

12 27 28 13 14 29 30 15

Com

man

d re

lay

1

Com

man

d re

lay

2

Bac

kup

gene

ral t

rip

Link

with

the

cent

ral e

quip

men

t eith

erfib

re–o

ptic

or V

.24

inte

rfac

e (R

S 2

32C

)

8A1

8A2

8A3

8A4

4B1

4B2

34 33

4A1

4A 4A2

4A3

4A 4A4

46 47

TxD

MT

7U

T5

12

RxD

MR

3536 10 11 31 32 16221921182017635241

Faul

t in

dica

tions

of

the

devi

ce

Dev

ice

oper

ativ

e

Bin

ary

inpu

t 1

Bin

ary

inpu

t 2

Dev

ice

gene

ral t

rip

I (def

inite

/inve

rse

time)

Gen

eral

trip

Gen

eral

trip

rela

y

Trip

com

man

d

Sid

e 1

Sid

e 2

2–kV

–iso

late

d

DIFF

�>

and

>

>DI

FF�

Differential Relays



Fig. 8Connection diagram for 7UT513 differential protection relay with overcurrent standby and two overload functions

TxD

MT

Bin

ary

inpu

ts, a

larm

rela

ys, c

omm

and

rela

ysLE

Ds

can

be m

arsh

alle

d

L1L2

L3L1

L2L3

L1 L2 L3N

L2L3

L1

L1 L2 L3NL1 L2 L3 NB

acku

p ge

nera

l trip

Buc

hhol

z in

dica

tion

Gen

eral

trip

Gen

eral

trip

Tank

pro

tect

ion

trip

com

man

d

Res

tric

ted

eart

h fa

ult t

rip c

omm

and

Ther

mal

war

ning

sta

ge o

verlo

ad 1

, 2

Ove

rload

trip

1, 2

Faul

t ind

icat

ions

of t

he d

evic

e

Dev

ice

oper

ativ

e

1 4 2 5 3 6

3A1

3A2

2A1

2A2

1A1

1A2

7 108

119

12

3B1

3B2

2B1

2B2

1B1

1B2

27 30 28 31 29 32

3D1

3D2

2C1

2C2

1C1

1C2

L1 L2 L3 L1 L2 L3 N L1 L2 L3 NN

26

L+ L–

13 33 34 54 53 56 55 58 60 59 62 61 15 1614 57

1D1

2D1

2D2

8A1

8A2

8A3

8A4

8D1

8D3

8D4

7D1

7D2

4B1

4B2

1D2

8D2

RxD

MR

4A1

4A 4A2

51 52

Bin

ary

inpu

t 1

Bin

ary

inpu

t 2

Bin

ary

inpu

t 3

Bin

ary

inpu

t 4

Bin

ary

inpu

t 5

Ala

rm re

lay

1

Ala

rm re

lay

2

Ala

rm re

lay

3

Com

man

d

7U

T513

Ala

rm re

lay

4

Ala

rm re

lay

10

Ala

rm re

lay

9

Ala

rm re

lay

8

Ala

rm re

lay

7

Ala

rm re

lay

6

Com

man

d

Com

man

d

Com

man

d

Com

man

d

7B1

8B1

6B1

7B2

8B2

6B2

7B3

8B3

6B3

7B4

8B4

6B4

4D2

4D1

4D4

4C4

4C2

4C3

3C4

3C2

3C3

7D4

7D3

4C1

3C1

4D3

65 64 63 68 67 66 71 70 69 86 85 84 88 87 90 94 93 96 95 44 43919289

Vers

ion

for p

anel

sur

face

mou

ntin

g

Vers

ion

for p

anel

flus

h m

ount

ing/

cubi

cle

mou

ntin

g

6A3

6A1

6A2

5B1

5B3

5B4

5B2

5A1

5A3

5A4

5A2

6D1

6D3

6D4

6D2

5D1

5D2

5D3

5D4

4A3

4A 4A4

19 18 17 74 99 100

75 72 97 98 73 20 22 23 21 24 25 49 50 76 77

Pow

er s

uppl

y

Buc

hhol

z in

dica

tion

LED

Res

et

Use

r def

ined

indi

catio

n

Buc

hhol

z w

arni

ng

i E1

i E2

>>

blo

ckin

g I (d

efin

ite/in

vers

e tim

e)

Dev

ice

gene

ral t

rip

Trip

com

man

dD

IFF

I>

and

>

>D

IFF

I

Buc

hhol

z w

arni

ng

Gen

eral

trip

Gen

eral

trip

Gen

eral

trip

Mal

func

tion

alar

m re

lay

Ala

rm re

lay

5

Sid

e 1

Sid

e 3

Sid

e 2

Link

with

the

cent

ral e

quip

men

t eith

erfib

re–o

ptic

or V

.24

inte

rfac

e (R

S 2

32C

)2–

kV–i

sola

ted

rela

y 1

rela

y 2

rela

y 3

rela

y 4

rela

y 5

Differential Relays



Tank protection trip

Device operative

Fig. 9Connection diagram for 7UT513 differential protection relay with restricted earth fault protection (low impedance) or sensitive/normal overcurrent (earth)

� Connection of the restricted earth faultprotection is freely allocable to side 1,side 2 or side 3.

� For ordering with normal/sensitive over-current earth (Pos. 13 = 2) �E2 is the sen-sitive input (also as tank protection).

� For ordering with REF or overcurrent (Pos. 13 = 1) both inputs �E1, �E2 are nor-mal inputs.

Power supply

L+

L–

15

16

4A14A

4A2

81

82

TxD–K

MT

4A34A

4A4

76

77

V.24 interface (RS 232 C)Fibre–optic interface

Connection for the LSA

SV

2D1

2C12C21C11C21D11D2

2D233

283120321314

34

59

53

54

55

56

57

58

60

61

62

3D1

3B13B22B12B21B11B2

3D227

7103

11

12

30

1A1

3A13A22A12A2

1A23

1476

4

8D4

3A2

3A1

3A4

3A3

8D2

8D1

8D3

7D2

7D1

4B5

4B4

+12 V

–12 V

4B1

4B2

Alarm relay 1

Command relay 2

7B18B16B17B28B26B27B38B36B37B48B46B44D2

4D1

3C23C37D4

7D3

65646368676671706986858488

87

95

44

436A36A16A25B15B35B45B25A15A35A45A26D16D36D46D25D1

5D25D35D4

191817749910075729798732022232124

254950

Restricted earth fault

Thermal warning stage

Overload trip 1, 2

Command relay 3

Command relay 4

Command relay 5

Command relay 1

Alarm relay 2

Alarm relay 3

Alarm relay 4

Alarm relay 6

Alarm relay 7

Alarm relay 8

Alarm relay 9

Alarm relay 10

Fault indicationsof the device

Buchholz indication

Buchholz warning

General trip

General trip

General trip

overload 1, 2

4D4

4C44C24C33C4

4C1

3C14D3

90

9493

96

91

9289

Malfunctionalarm relay

Alarm relay 11

Standby general trip

Device general trip

trip command

General trip

General trip

Version for panel surface mounting

Version for panel flush mounting/cubicle mounting

IL1 Winding1

IL3 Winding 1

IL2 Winding 1

IL1 Winding 2

IL3 Winding 2

IL2 Winding 2

IL1 Winding 3

IL3 Winding 3

IL2 Winding 3

IE2

IE1

Binary input 1

Binary input 2

Binary input 3

Binary input 4

Binary input 5

7UT513

26

Fibre optic Fibre optic

L1 L2 L3

L3L2L1

N

L1

L2

L3N

�E2

�E1

ITrip commandDIFF> andIDIFF>>

Tank protection

command

(not marshallable)

Restricted earth–faultprotection

Connection of the restricted earth–faultprotection can be parameterized for dif-ferent winding.

Differential Relays


Dimension drawings in mm

Fig. 107UT512 with housing 7XP2030–2 (for panel flush mounting or cubicle mounting)

Front view Side view Panel cutout

131.5105

146

7.313.2

255.

8

245

266

231,5

30 29.5

1.5

5.4

150

145

10

Fibre opticconnection

244

172

Diam. 5or M4

Diam. 6

Fig. 117UT513 with housing 7XP2040–2 (for panel flush mounting or cubicle mounting)

206.5180

221

7.313.2

255.

8

245

266

231.5

30 29.5

1.5

5.4

244

172

10

225

220

Front view Side view Panel cutout

Fibreoptic connection

Diam. 5or M4

Diam. 6

Fig. 127UT512/513 for panel surface mounting

260

29.5

266

71Z

280

344

159

144Fibre opticinterface

116

1.539

Cutout 20 x 60(without paint)

6031 45

3015

46

27

40

. . . . .. . . . .

. . . . .. . . . .

280

344

234

219

126

10051 75

5025

76

7.5

. . . . .. . . . .

. . . . .. . . . .

7UT512 (7XP2030–1) 7UT513 (7XP2040–1)

Detail Z:

Front view Side view Side view

Differential Relays


Conditions of Sale and Delivery

Subject to theGeneral Conditions of Supply and Deliveryfor Products and Services of theElectrical and Electronic Industryand to any other conditions agreed uponwith the recipients of catalogs.

�

The technical data, dimensions and weights are subject to change unlessotherwise stated on the individual pagesof this catalog.

The illustrations are for reference only.

We reserve the right to adjust the pricesand shall charge the price applying onthe date of delivery.

Export Regulations

In accordance with present German andUS export regulations export licences (da-ted 05.96) are not required for the prod-ucts listed in this catalog.Export and re–export are therefore

permissible without the approval of therelevant authorities except where currentGerman export regulations contain coun-try–specific restrictions.

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 theproduct.

Trademarks

All product designations used are trade-marks or product names of Siemens AGor of other suppliers.

Dimensions

All dimensions in this catalog are given inmm.

Siemens online!

You will find Siemens Power Transmissionand Distribution in the Internet:

Responsible for

Technical contents: Norbert Schuster,Siemens AG, EV S V13, Nürnberg

General editing: Roland Reichel/Claudia Kühn–Sutiono,Siemens AG, EV S SUP22, Nürnberg/EV BK2, Erlangen

http://www.ev.siemens.de

Conditions of Sale and Delivery � Export Regulations � Trademarks � Dimensions

A 9.91 a

Siemens Aktiengesellschaft

BereichEnergieübertragung und -verteilungGeschäftsgebiet SekundärtechnikP. O. Box 48 06D-90026 Nürnberg

Order No.: E50001-K5722–A141-A2–7600Printed in the Federal Republic of GermanyKG K 0696 3.0 SC 14 En

PowerTransmissionand Distribution

7UT51x Catalogue En

Documents

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