7SA5115 Distance Protection Relay V3

Overcurrent and Distance Relays

Siemens LSA 2.1.11 . March 1997 1

Application

The 7SA511 distance protection relayprovides fast, reliable and selective clear-ance of faults on overhead lines andcables, being fed from one or multiplepoints. The network can be radial, ring ormeshed. The system star point may beisolated, resonance earthed (e.g. Peter-son coil), solidly earthed or low–resis-tance earthed.The relay incorporates all functions nor-mally required for distance protection andcan also be applied as a time-gradedback-up protection for all types of differ-ential protection schemes.The 7SA511 can be incorporated in bothconventional switchgear systems andmodern LSA 678 substation control andprotection systems.

Construction

With its compact construction the7SA511 contains all the components re-quired for current and voltage measure-ment for protection scheme logic, faultrecording and on-line measurements, op-erator panel with display field, event/alarm and command outputs, binary (con-tact) inputs, serial interfaces and powersupply with DC/DC converter.The relay can be supplied in three casevariations. The version for surface mount-ing is supplied with 100 two-tier termi-nals accessible from the front. The ver-sions for flush mounting or cubiclemounting have rear connection terminalsand are available with or without glasscover.

Mode of operation

All data processing within the 7SA511 isdigital, from the measurement of volt-ages and currents to the tripping decisionlogic. The application of digital measure-ment to a large degree suppresses theinfluence of switching currents, transientDC current components, high–frequencytransients and harmonics.

Serial interfaces

The relay is fitted with two serial inter-faces.The operator interface on the front panelis suitable for the connection of a PC.The operating and analysis softwareDIGSI, running under WINDOWS, is avail-able as an option to enable user-friendlyparameter setting, analysis of fault dataand records, and commissioning.The system interface (either isolatedRS232C/V.24 or fibre-optic) is availablefor connection to the SiemensSINAUT LSA 678 substation controlsystem, to a central data acquisition sy-stem, to the data concentrator DAKON orto a starcoupler.The communication protocol used is thecompatible protocol according IEC870–5–103. The serial information inter-face has been certified by the researchinstitute for high-voltage and high-currenttechnology (FGH) and declared to be inconformity with the IEC 870–5–103 stan-dard.Remote operation of the distance protec-tion relay 7SA511 with the DIGSI soft-ware is possible if a modem is connectedto the FO–serial interface.For existing systems, the Siemens-spe-cific protocol to DIN 19 244 is still avail-able.

Settings

All settings can be input by means of theintegrated operator and display fieldpanel, or a PC. All parameters are identi-fied in clear text. The settings are storedin a non-volatile memory, so that theycannot be lost even during interruption ofthe supply voltage.All parameters are reliably stored inEEPROMs and are thus independent ofthe state of charge of the memory bat-tery.

Self-monitoring

Hardware and software components aremonitored continuously and any irregula-rities are immediately detected andalarmed. As a result, the security, avail-ability and reliability of the relay are sig-nificantly improved.

SIPROTEC 7SA511 distance protection relay (Version V3)

Fig. 1SIPROTEC 7SA511 distance protection relay

21

21N

50

50/

Scope of functions

67N

49

78

79

25

51N

FL

FR

LM

Siemens AG 1997�

Siemens AG 1997�


Siemens LSA 2.1.11 . March 19972

Distance protection

Distance protection is the main functionof the 7SA511 relay. The distinguishingfeatures of the relay are as follows:� Availability of multiple starting options:

a) Overcurrent fault detection ��b) Voltage-dependent overcurrent faultdetection V</�> (option)The measured voltages, depending onthe selected settings and the earthfault detection, may be 3 x phase-to-earth VPH –E, depending on the phasecurrent �PH (see Fig. 2) or the 3 xphase-to-phase voltages VPH –PH.c) Polygonal impedance characteristicfault detection Z< (option) (see Fig. 3).Either the impedances of the 3 xphase-to-phase loops or 3 x phase-to-earth loops are calculated dependingon the earth-fault detection. The effectof apparent impedances in unfaultedphases during earth faults is elimi-nated by a compensation method.

� Earth faults are detected by earth cur-rent �E detection and/or residual volt-age VE measurement.

� Polygonal tripping characteristics withseparate settings for reactance X andresistance reach R (see Fig. 4). Sepa-rate settings are provided for the resis-tance reach R for phase-to-phase andphase-to-earth faults. Five distancezones are provided and they may beindependently set in the forward or re-verse direction or non-directional. Twoof the zones may also be used forzone extension schemes. In addition, adirectional and a non–directionalback–up time stage is available.

� Directional measurement using soundphase polarization and voltage memoryfor unlimited sensitivity.

� Seven independent time delays areprovided.

� Phase-selective tripping is available foruse with single-pole or single andthree-pole rapid auto-reclosingschemes.

� Automatic blocking of the distanceprotection function is provided follow-ing detection of a V.T. failure to pre-vent incorrect distance measurement.

Fault locator

Fault location is provided through calcula-tion of the fault impedance. The distance-to–fault may be output in ohms, kilome-ters or percentage of the line length.As an option, the fault location can beprovided by parallel–line mutualcompensation, if the zero–current of theparallel–lines can be measured.


Fig. 2Characteristic of voltage-dependent overcurrent fault detector V PH–E ( �PH )

V PH–E( �>>)

V PH–E( �>)

�> �>> ��PH

V PH–E

Fault detection

Fig. 3Characteristic of impedance fault detector (Z<)

Phase – Phase – Fault

Phase – Earth – Fault

Fault detection:

R

X

X + A

RA1

E

RA2

X – A

RA2

E

�A

�AE

RA1

Fig. 4Distance protection tripping characteristics

ca.45�

R 1 R 1B

R 1L

R 2 R 3

X 1

X 1B

X 1L

X 2

X 3X

R

R 1E



Overcurrent-time and definite-timeovercurrent protection (emergency)

The distance protection 7SA511 can beused as a two-stage definite-time over-current protection. This protective func-tion can only be automatically activated ifthe measuring voltage fails resulting fromshort–circuit or fault in the V.T. circuit, orif the V.T. c.b. trips.

Universal teleprotection interface

For fast selective clearance of faults overthe complete line a comprehensive tele-protection facility is provided. The follow-ing schemes may be selected:� Intertrip via fault detection� Intertrip via zone extension Z1B� Signal comparison with zone extension

Z1B� Unblocking with directional fault detec-

tion� Directional comparison� Unblocking with zone extension Z1B� Blocking with zone extension Z1B� Pilot wire protection� Reverse interlock functionAn echo function for zero or weak infeed,and a current reversal block function forcomparison or blocking are integrated.

Switch-on-to-fault protection

Through the use of a binary input repre-senting manual closing of the line circuit-breaker the 7SA511 can initiate a switch-on-to-fault function. The function may beset to initiate immediate tripping fromzone Z1B or from the fault detection ele-ments.Earth-fault detection in non-earthednetworks (option)

In networks with no star-point earthing,single phase-to-ground earth-fault detec-tion is provided. The following functionsare included:� Detection of an earth fault by monitor-

ing the residual displacement voltageVE

� Determination of the faulted phasethrough measurement of the phase-to-earth voltages

� Determination of the direction of theearth fault through precise measure-ment of the active and reactive com-ponents of the residual current (�E)

� Annunciation or tripping in the event ofan earth fault in forward direction

� Measurement of the respective con-tent of the active and reactive compo-nent of the earth current during anearth fault.

Sensitive earth-fault protection inearthed networks (option)

In earthed networks which are subject toextreme high-resistance earth faults, it ispossible for the fault impedance to lieoutside of the distance protection imped-ance characteristic. The 7SA511 may in-clude the following optional functions forhigh–resistance earth fault protection:� Directional earth-fault protection with

emergency and back-up definite-timeovercurrent protection function

� Earth-fault overcurrent protection func-tion with inverse-time characteristic

� The directional earth-fault functionmay be extended to become a direc-tional comparison scheme with theuse of interstation signalling and com-parison logic.

Automatic-reclose function (option)

The 7SA511 can be ordered with an auto-reclose (AR) facility.The range of functions include:� 3-pole RAR/DAR for all fault types

(DAR: delayed AR–cycle)� 1-pole RAR for single-phase faults, no

reclose for multiple-phase faults� 1-pole RAR for single-phase faults,

3-pole RAR/DAR for multiple-phasefaults

� 1-pole RAR for single-phase and for2-phase faults without involvement ofearth, and 3-pole RAR/DAR for otherfaults

� Multi-shot DAR� Integration with external AR equip-

ment with communication via binary(contact) inputs and outputs

� Control of the 7SA511 AR function byan external protection scheme

� AR blocking for faults in the cable sec-tion of mixed routes (cable and over-head line).

Power swing (option)

Power swings can give rise to high equal-ization currents and small voltages. Smallvoltages, with simultaneous high cur-rents, mean small impedances, whichcan lead to tripping of the distanceprotection. In order to avoid uncontrolledtripping by the distance protection andspecific tripping in the event of synchro-nism loss, the 7SA511 distance protec-tion relay features an additional powerswing function option.The following reaction to power swingscan be set:� Blocking

The distance protection tripping func-tion may be blocked for the duration ofthe power swing

� TrippingTripping may be initiated following thedetection of a power swing outsidethe defined stability limits.

Synchronism check (option)

Where two network sections areswitched in by control command or fol-lowing a 3-pole RAR, it must be ensuredthat both network sections are mutuallysynchronous. For this purpose, the dis-tance protection relay 7SA511 features asynchronism check function. After verifi-cation of network synchronism, the func-tion enables the CLOSE command. Alter-natively, reclosing can also be verifiedafter a check for dead state of the busbaror cable.

Thermal overload protection

For thermal protection of cables an over-load protection with an early-warningstage is provided. The thermal replica canbe formed with the maximum or meanvalue of the respective excess tempera-tures in the three phases, or with thetemperature rise from the respectivemaximum phase current.The tripping time characteristics are ex-ponential functions to IEC 255–8 and theytake account of heat loss due to the loadcurrent and the accompanying drop intemperature of the cooling medium. Theprevious load is therefore taken into ac-count in the tripping time on overload. Asettable alarm stage can output a currentor temperature-dependent indication be-fore the tripping point is reached.

Selectable parameter changeover set-ting groups (option)

Through binary (contact) inputs or via therelay setting facilities (front panel or se-rial interface) it is possible to change be-tween four sets of previously stored pa-rameter settings. This allows the rapidmodification of relay settings to matchconfiguration changes in the protectednetwork.Parameter set changeover is also pos-sible via the compatible IEC 870–5–103interface.




Fault recording

The digitized measured values of phasecurrents, earth current, phase voltagesand residual earth voltage, together withseveral binary channels, are stored withparameterizable pre–trigger and post–fault time. Storage of recorded fault datais battery–buffered and therefore remainsavailable even after an interruption of theauxiliary power supply. Fault recordingcan be transmitted to a PC and to the SINAUT LSA substation control systemfor evaluation. Parallel operation of PCand substation control system is pos-sible. If the IEC870–5–103 protocol isused, up to 8 fault records can be stored.The data memory is organized as a ringbuffer store with a maximum length of 5s (at fN = 50 Hz). The oldest fault recordsare overwritten with the newest data. Afault record can also be started via abinary input or – especially as an aid incommissioning – via an integrated controlpanel or PC. The respective record dura-tion can then be parameterized.

Function allocation for command andalarm relays, LEDs and binary inputs

The 7SA511 is equipped with 5 heavy-duty output relays. They can be linkedwith the commands for the above-men-tioned protective functions and with allother signal outputs or binary signals.For user-specific output and display ofsignals, alarm relays and LEDs may beallocated as desired. Individual signalscan be grouped. The stored LED indica-tions are protected from supply voltagefailure.All binary inputs can likewise be allocatedas desired.

Measurement and test functions

The 7SA511 provides a large number oftest and measurement functions, includ-ing the following:� Measurement of the (in-service) im-

pedance of six impedance loops andindication of direction, reactance andresistance

� Monitoring of the phase sequence� In-service measurement �L1

, �L2, �L3

� In-service measurement VL1–L2,VL2–L3, VL3–L1, VL1, VL2, VL3

� Active and reactive power measure-ment

� Frequency measurement� Trip circuit test facility, single and

three-pole operation� Auto-reclose test facility, single and

three-pole operation� Measurement of the respective con-

tent of the active and reactive compo-nent of the earth current during anearth fault.

Non-volatile storage of operational re-cords

The 7SA511 provides all the data neces-sary to analyze the operational perfor-mance of the relay following a networkfault. The following recording functionsare all secure from interruption of theauxiliary power supply.� Real-time clock

A standardized, battery-backed, real-time clock is available which may besynchronized via a binary input or viathe system serial interface. The clocktime can be set via PC and IEC870–5–103 interface. All events are re-corded with a date and time tag.

� Fault indicationsThe operational records (e.g. faulttype, distance-to-fault etc.) for the lastthree fault operations are available viathe integrated control panel. The lastfour operational records are availableat the PC interface via DIGSI.

� Operational indicationsAll signals not associated directly withthe fault are stored in the operationalindication buffer.

� Earth-fault protocol (isolated networks)Relays with the optional isolated/com-pensated network earth-fault detectionfunction store, record and fault detailsin a separate memory block.

� Tripping statisticsFor each pole of a circuit-breaker it ispossible to record the progressive totalof tripping and opening operations aswell as the summation of the breakingcurrent.

� Automatic data displayAn operation mode may be selected inwhich two (normal service) measuredvalues are continuously updated on theintegrated LCD display. Following afault operation two (previously se-lected) stored fault information valuesare displayed.

User-definable binary inputs and timestages, external tripping

There are four binary inputs available forrecording of binary signals, e.g. signalsfrom other protective devices. These in-puts are stored in the operational indica-tions buffer and can be passed to alarmrelays, LEDs and the SINAUT LSAsubstation control and protection.The relay is also equipped with twoparameterizable time stages. The startand reset signals can be marshalled tobinary inputs; the timing period can bemarshalled to alarm relays and LEDs.Pickup and reset delay can be set acrossa broad range. External use of additionaltime relays for special switching require-ments will in future be dispensed with.By coupling in from outside via binary in-puts, phase-selective remote tripping cantake place with and without automaticreclosing.




Technical data

Input circuits Rated current �NRated voltage VNRated frequency fNThermal overload capability in v.t. circuits, continuous

in c.t. circuits, continuousfor 10 sfor 1 s

Dynamic overloadBurden v.t. circuits

c.t. circuits at �N = 1 Aat �N = 5 A

Residual current input 1 A(isolated network option)

1 or 5 A80 to 125 V AC 50 or 60 Hz140 V AC 4 x �N30 x �N100 x �N250 x �NApprox. 0.1 VAApprox. 0.05 VAApprox. 0.2 VAApprox. 0.05 VA

Voltage supplyvia integrated DC/DC converter

Rated auxiliary voltage Vaux

Permissible tolerancePermissible max. ripple (pk-pk)Power consumption quiescent

energizedMax. operating time after auxiliary voltage drop

24, 48 V DC 60, 110, 125 V DC 220, 250 V DC–20 to +15 %�12 %Approx. 16 WApprox. 26 W�50 ms at Vaux �110 V

Binary inputs Number of inputsVoltage rangeCurrent input

10 (marshallable)24 to 250 V DC, adjustable in 4 rangesApprox. 1.7 mA

Indication contacts Number of relayswith 1CO contact eachwith 1NO contact each

Switching capacity make/breakSwitching voltagePermissible current continuous

11 (marshallable)6520 W/VAMax. 250 V AC/DC 1 A

Heavy duty contacts Number of relays, with 2 NO contacts eachSwitching capacity make

breakSwitching voltagePermissible current continuous

0.5 s

5 (marshallable)1 000 W/VA30 W/VAMax. 250 V AC/DC 5 A30 A

LED displays Ready for operation greenFault indication redMarshallable LEDs red

1114

Serial interfaces Operator interface

Baud rateSystem interface

Baud rateElectrical connection

Insulation transmission distancefibre-optic connection

optical wavelengthpermissible line attenuationtransmission distance

On the front panel, not isolated, suitablefor connection of a PC1 200 to 19 200 BdControl system interface, isolated, suitablefor coupling to a central unit1 200 to 19 200 BdSimilar to V.24/V.28 to CCITT or RS232C toEIA, 2kV isolated, cable with 2 core pairs,with individual and common screening e.g.LIYCY–CY/2 x 2 x 0.25 mm2

Max. 1 kmIntegrated FSMA connector for fibre-opticconnection820 nmMax. 8 dB (for 62.5/125 �m fibre)Max. 1.5 km

Construction Housing, dimensionsWeight panel flush mounting/cubicle mounting

panel surface mountingDegree of protection according to EN 60 529 housing

terminals

7XP20, see dimension drawingsApprox. 9.5 kgApprox. 11 kgIP 51IP 21




Technical data

CE–conformity, standards This product is in conformity with the directives 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) and to the use of electricalequipment within defined voltage ranges (low–voltage directive73/23/EEC). The product conforms with the international standardIEC 255 and the national standard DIN 57 435 part 303 (corres-ponding to VDE 0435 part 303).The relay is designed for use in an industrial environment, forinstallation in standard relay rooms and compartments so thatwith proper installation electro–magnetic compatibility (EMC) isensured.

Conformity is proved by tests performedby Siemens AG in line with article 10 of theCouncil Directives in accordance with thegeneric standards EN 50081 and EN 50082for the EMC directive 89/336/EEC and withstandard EN 60255–6 for the low–voltagedirective.

Insulation tests

IEC 255–5, DIN 57 435 part 303High–voltage test (routine test), except d.c. voltage supply inputHigh–voltage test (routine test), only d.c. voltage supply inputImpulse voltage test (type test), all circuits, class III

2 kV (rms), 50 Hz2.8 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 255–6, IEC255–22(international product standard)EN 50082–2 (generic standard)VDE 0435 part 303 (Germanproduct standard)

High frequency test with 1 MHz interferenceIEC 255–22–1, class III and VDE 0435 part 303, class IIIElectrostatic dischargeIEC 255–22–2, class III and IEC 1000–4–2, class IIIRadio–frequency electromagnetic field, non–modulatedreport IEC 255–22–3, class IIIRadio–frequency electromagnetic field, amplitude modulatedIEC 1000–4–3, class IIIRadio–frequency electromagnetic field, puls modulatedENV 50204, class IIIFast transientsIEC 255–22–4 class III, IEC 1000–4–4 class IV

Conducted disturbances induced by radio–frequency fields, amplitude modulatedIEC 1000–4–6, class IIIPower frequency magnetic fieldIEC 1000–4–8, class IVIEC 255–6

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 Hz0.5 mT; 50 Hz

EMC–tests; emission (type test)

Standard: EN 50081–* (European generic standard)

Conducted interference voltage, auxiliary voltageCISPR 22, EN 55022 and VDE 0878 part 22Interference field strength CISPR 11, EN 55011 and VDE 0875 part 11

150 kHz to 30 MHz, class B

30 to 1 000 MHz, class A

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 150 Hz, 0,5 g acceleration5 to 8 Hz, 7,5 mm amplitude8 to 150 Hz, 2 g acceleration




Technical data (continued)

Distance protection Setting rangesEarth-fault detection

Earth current �E/�N Step 0.01 0.25 to 1Displacement voltage

1 V1 V

VE� (� 3� V0, earthed network)VE� (� 3� V0, isolated network)

2 to 100 V10 to 100 V

Overcurrent fault detection (��)Overcurrent �PH/�N 0.01

Impedance fault detection (Z<)CharacteristicForward reach X+ 0.01 �Reverse reach X– 0.01 �Resistance tolerance 0.01 �Threshold angle between load andshort–circuit range 0.1�Minimum current �PH/ �N 0.01

Voltage dependent overcurrent fault detection (V</�>)

Phase-to-earth voltage VPH–E (�>) 1 VPhase-to-earth voltage VPH–E (��) 1 VPhase-to-phase voltage VPH–PH (�>) 1 VPhase-to-phase voltage VPH–PH (��) 1 V

Distance measurementCharacteristicDistance zones

Reactance reach X 0.01 �Resistance tolerance R

for phase-to-phase faults 0.01 �for phase-to-earth faults 0.01 �

Time stages

Timer range 0.01 sResidual compensation

0.1 to 4

Polygonal0.1 to 200 �1)

0.1 to 200 �1)

0.1 to 200 �1)

30 to 80�0.1 to 4

20 to 70 V20 to 70 V40 to 130 V40 to 130 V

Polygonal5, 2 as zone extensions and all zones maybe set in the forward, reverse or in bothdirections (non-directional)0.05 to 130 �1)

0.05 to 65 �1)

0.05 to 130 �1)

7 for multi-phase faults3 for single-phase faults0 to 32 s or infinite

0.01XEXL

,RERL

–7 to 7

Parallel line mutual compensation0.01XM

XL,

RMRL

–7 to 7

Directional determinationfor all failure types

Directional sensitivity

with externally generated short-circuit trip-ping currents and voltage memoryDynamically unlimited

Operating timesMinimum trip contactReset time

Tolerances

23 msApprox. 30 ms

Measurement tolerances according to VDE 0435, Part 303 for sinusoidal quantities

for impedance fault detection �XX� 5 % for 30o

� � � 90o

�RR� 10 % for 0o

� � � 60o

for distance measurement �XX� 5 % for 30o

� � � 90o

�RR� 5 % for 0o

� � � 60o

for amplitude measurementTimer accuracy

�5 %�1 % of set value or 10 ms

1) Impedance settings referred to �N = 1 A; at �N = 5 Athese values are 5 times the secondary values.




Technical data (continued)

Fault locator Distance to fault

Start signal

Reactance per unit length Step 0.001 �/kmParallel line compensationMeasurement tolerance (according to VDE 0435, Part 303for sinusoidal quantities)

Secondary �, primary �, km or % of linelengthTrip output, fault detector reset or binaryinput0.01 to 5 �/kmSelectable; option�2.5 % line length for 30� ��k �90�� andVK/VN �0.1 without intermediate infeed

Power swing(devices with impedance starting Z<)

Power swing detection principle

Modes

Differences between power swing polygon Step 0.01 �and fault detectorRate of change (impedance) 1 �/sOperating time 0.01 s

Measurement of the rate of change of im-pedancePower swing blockingPower swing tripping0.1 to 50 �

0 to 200 �/s0.01 to 32 s or until end of power swing

Definite–time o/c emergency mode

Automatic initiation on recognition of measuring voltage failure orv.t. m.c.b. tripSetting ranges

Overcurrent �PH >/�N Step 0.01Earth current �E >/�N 0.01High set o/c �PH �/�N 0.01Timers tI>, tIE>, tI � 0.01 s

Measurement tolerance (according to VDE 0435, Part 303for sinusoidal quantities)

0.1 to 40.1 to 40.5 to 9.990 to 32 s or infinite�5 %

Universal teleprotection interface ModesTripping

Comparison

Pilot wire protectionReverse interlock

Tripping via fault detectionTripping via zone extension (POTT/PUTT)Signal comparisonDirectional comparisonUnblocking with zone extensionUnblocking with trippingBlocking––

Earth-fault detection(isolated networks)

Earth-fault detection using Step 1 Vresidual displacement voltage VE� (� 3� V0)

10 to 100 V( )

Faulted phase detectionVPH–E < (faulted phase) 1 VVPH–E > (unfaulted phase) 1 V

Measurement tolerance (according to VDE 0435, Part 303for sinusoidal quantities)Directional determination

Measuring principleEarth-fault current �E> (active/reactive �), 1 mAcable-type c.t. angle error correction 0.1�Measurement tolerance (according to VDE 0435, Part 303 for sinusoidal quantities)

10 to 100 V10 to 100 V�5 % of set value

Active/reactive power measurement3 to 1 000 mA0 to 5� in 2 operating points�10 % of set value

Sensitive earth-fault protection(high–resistance faults in earthed networks)

Directional earth-fault protection with back-up definite-time non-directional overcurrent functiong

Earth-current fault detection �E >/�N Step 0.010.1 VResidual displacement voltage VE� (� 3� V0)

0.1 to 41 to 10 V

Directional determinationCarrier signallingOperating times

Shortest tripping timeCurrent reversal guard timeTripping time delay 0.01 sTimer tolerance

Undirectional–earth-fault protection with inverse–time characteristic

Characteristics according to IEC 255 – 3,or BS142

Pick-up value �E > �N 0.01Time multiplier tIE 0.01 sTolerances

Current pick-upOperating time

with �E and VEDirectional comparison

Approx. 30 msApprox. 30 ms0 to 32 s or ineffective�1 % of set value or 10 ms

Normal inverseVery inverse, Extremely inverse0.1 to 40 to 32 s

5 to 15 % of set value�5 % �15 ms for 2 �(�/�E>) �20 and 1 s �tIE �30 s




Technical data (continued)Overload protection Setting ranges

Factor k to IEC 255 – 8 Step 0.01Time constant � 0.1 minEvaluation of thermal replicaTemperature warning stage �Alarm /�Off 1 %Current warn stage �Alarm/ k �N 0.01

0.1 to 41 to 999.9 min�max, �mean, � with �max50 to 100 %0.1 to 4

Tripping time characteristic t � � � �n�2 – �2

pre

�2 – ( k �N )2

Reset conditions�/�Off�/�Alarm��Alarm

Tolerances

Approx. 0.99Approx. 0.99Approx. 0.99Class 10 % to IEC 255–8

Auto-reclose Auto-reclose operation counterModesActive times for RAR and DAR cycle Step 0.01 sDead times in RAR cycle 0.01 sDead times in DAR cycle 0.01 sReclaim times 0.01 sClose command duration 0.01 s

Up to 10only 1-pole, only 3-pole, 1 or 3-pole0.01 to 320 s0.01 to 320 s0.01 to 1 800 s0.5 to 320 s0.01 to 32 s

Synchronism check Modes for connectingLine dead/busbar liveLine live/busbar deadSynchronism

Permissible voltage difference �V Step 1 VPermissible frequency difference �f 0.01 HzPermissible angle difference �� 1°

V1< / V2>V1> / V2<V1> / V2>1 to 50 V0.01 to 1 Hz1 to 60°

Fault recording Measured valuesStarting signal

Recording managementMaximum number of simultaneously available recordsSampling intervalMax. recording period (sum of all records)

at 50 Hzat 60 Hz

Pre–trigger time Step 0.01 sPost–fault time 0.01 sMax. period for one record 0.01 s

iL1, iL2, iL3, iE, vL1, vL2, vL3, vETripping, fault detection, binary input, con-trol panel, PCDynamic ring buffer store, battery buffered820 sampling values per network period

5 s4.2 s0.05 to 0.5 s0.05 to 0.5 s0.3 to 5 s

Additional functions Operating values forCurrentVoltagePowerFrequencyEffective range

Earth current during earth faults in isolated networksOverload valuesTolerance

�L1, �L2, �L3VL1–L2, VL2–L3, VL3–L1, VL1, VL2, VL3P, Qf0 to 240 % �N, 0 to 120 % VN,0 to 120 % PN, 96 to 104 % fN�ea, �er� / �trip

�2 % of respective rating




Selection and ordering data

Order No.Distance protection relay 7SA511 � – � � A � � – � � � �

Rated current at 50/60 Hz1 A5 A

15

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

245

ConstructionFor panel surface mountingFor panel flush mounting/cubicle mountingFor panel flush mounting/cubicle mounting without glass cover

BCE

Functions/languageV3 with IEC 870–5–103 protocol, overload protection and with synchrocheck (option)Operator language GermanOperator language English

67

Fault detectionWith overcurrent ( ��)With impedance ( Z< )/Overcurrent ( ��)/Voltage-dependent overcurrent (V<, �>), settable optionWith voltage-dependent overcurrent (V<, �>)/Overcurrent ( ��), settable option

123

Options AWithout wattmetric earth-fault detection without FLPCWith wattmetric earth-fault detection without FLPCWithout wattmetric earth-fault detection with FLPC

012

Serial system interfaceWithoutIsolated, V.24/RS232CIntegrated fibre–optic interface

ABC

Options BWithout AR without parameter changeover facility, without synchronism checkWith AR, 3-pole without parameter changeover facility, with synchronism checkWith AR, 1 and 3-pole without parameter changeover facility, with synchronism checkWithout AR with parameter changeover facility, with synchronism checkWith AR, 3-pole with parameter changeover facility, with synchronism checkWith AR, 1 and 3-pole with parameter changeover facility, with synchronism check

ABCEFG

Options CWithout power swing without earth-fault protection for earthed networksWith power swing1) without earth-fault protection for earthed networksWithout power swing with earth-fault protection for earthed networksWith power swing1) with earth-fault protection for earthed networks

0123

FLPC – Fault location with parallel line mutual compensationAR – Auto-reclose

Operation software (German and English are standard, other languages on request)

DIGSI program (suitable for all protection relays 7UM..., 7UT..., 7SJ..., 7SA..., ...) GermanEnglish

Test version: GermanEnglish

Connecting cables for protection relays (25-pin) – PC (9-pin); (other variations supplied on request)

7XS5020–0AA007XS5020–1AA00

7XS5021–0AA007XS5021–1AA00

7XV5100–2

Documentation

German: Katalogblatt LSA 2.2.11: Abzweigschutz SIPROTEC 7SA511 (Version V3)Handbuch: Abzweigschutz SIPROTEC 7SA511 (Version V3)

E50001–K5712–A211–A2C53000–G1100–C98–3

English: Catalog LSA 2.2.11: SIPROTEC 7SA511 distance protection relay (Version V3)Manual: SIPROTEC 7SA511 distance protection relay (Version V3)

E50001–K5712–A211–A2–7600C53000–G1176–C98–3

1) Only available with impedance starting (Z<). Mark ”2” in the 12th digit of the Order No.




Function scope of special device ver-sions

Special device versions can be suppliedfor specific applications. The followingfunctions are available in all versions:Fault location, thermal overload protec-tion, load values, overcurrent–time anddefinite time overcurrent protection,

current, voltage, active power, reactivepower, frequency measurement, switch-ing statistics with summation of inter-rupted currents per pole, integratedclock, battery–buffered signal memoryand fault recording memory.

All equipment variants can be used inearthed and in compensated/isolated net-works. In accordance with the functionalscope of the individual equipment vari-ants, the main applications are stated inthe following table.

Functions VersionsBasicversion

Medium voltage High voltageversion Isolated,

compen-sated,earthed net-work

Earthed net-work

Isolated/compen-sated net-work

Earthed net-work

Distance protection with 3 + 2 zones, 7 time stepsDirection detection with voltage or sound phase polarizationOvercurrent starting

+++

+++

+++

+++

+++

V/� startingImpedance startingFault location

––+

+–+

+–+

+++

+++

Parallel–line mutual compensation for fault locationPower swingTeleprotection interface

––+

––+

––+

+++

+++

Emergency definite time overcurrent protection for measuring voltage failureThermal overloadEarth–fault detection in non-earthed network

++–

+++

++–

++–

++–

Back–up earth-fault protection (earthed network)Reclosing, 3-poleReclosing, 1/3-pole

–––

–+–

++–

–+–

+++

Synchronism checkProtection for switch–on–to–faultFault recording

–++

+++

+++

+++

+++

Parameter changeover facilityTransient earth–fault detectionFault location output, analog/BCD

–oo

+oo

+oo

+oo

+oo

+ Function included– Function not includedo Function possible with add-on




Selection and ordering data for the special device versions

Order No.Distance protection relay 7SA511 � – � � A � � – � � � �

Rated current at 50/60 Hz1 A5 A

15

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

245

ConstructionFor panel surface mountingFor panel flush mounting/cubicle mountingFor panel flush mounting/cubicle mounting without glass cover

BCE

LanguageOperating language GermanOperating language English

67

Special device versionsBasic versionMedium–voltage version: isolated, compensated, earthed network (sensitive current transducer for �E)

earthed networkHigh–voltage version: isolated, compensated network

earthed network

13322

01022

AFFFG

00213

Serial interfaceWithoutIsolated, V.24/RS232CIntegrated fibre–optic interface

ABC

Accessories for the distance protection relay 7SA511

Order No.Transient earth fault relay 7SN7100 – � � A 0 0

Rated auxiliary voltage100 to 110/220 V, AC, 50 Hz24 V DC48 V DC60 V DC110/125 V DC220/250 V DC

012345

ConstructionFor panel surface mountingFor panel flush mounting/cubicle mounting

BC

Order No.Fault location output equipment 7SM7 � 0 0 – � � � 0 0

Device typeAnalog output unitBCD output unit

01

Rated auxiliary voltage24 V DC48 V DC60 V DC110/125 V DC220/250 V DC

12345

ConstructionFor panel surface mountingFor panel flush mounting/cubicle mounting

BC

Binary inputFor BCD output unit 7SM71: no binary inputFor analog output unit 7SM70: 24/48/60 V DC

110/125/220 V DC

AAC





Fig. 5Connection diagram for distance protection relay 7SA511 (Version V3), state of development FF

L1 L2 L3

Remote reset LED

V.T. mcb trip

CB Aux. contact(Position ON)

Manual close

Carrier receive

Carrier receivefaultyCB ready

AR block

AR ON

AR OFF

DC power supply

L1

L2

L3

CB Alarm suppressed

Group annunciation 1Supervision of measuredquantitiesDevice operative(Alarm contact)

General trip signal

Reverse direction

Reclose command

General fault detec-tion

Trip command L1

Trip command L3

Optional– V.24 interface,

wire-wound– fibre optic interface

Trip command L2

�

TxDMT

�L1

�L2

�L3

�E1)

RxDMR

Carrier send

AR inoperative

Fault detection L1

Fault detection L2

Fault detection L3

Fault detection E

Binary inputs, alarm relays, command relays and LEDs are freely selectable1) option dependent sensitivity of �E –input:

– normal sensitivity or– high sensitivity for earth–fault detection

in compensated or isolated systems2) Vx input usable depending on function

– �en voltage– �2 voltage for synchronism check

�L1�L2�L3

�E

�

V L1V L2V L3V N

V L1

V L2

V L3

V N

V x2)

V xn

V n

V e

Version for panel surface mounting

L+L –

7SA511

6B4

8B2

6B17B2

7B18B1

6B27B38B36B37B48B4

Alarm relay 1

Alarm relay 2

Alarm relay 3

Alarm relay 4

2A2

3A1

3A2

1A1

1A2

8A28A1

4A1

4A2

Binaryinput 1

4A3

4A4

Commandrelay 3

Alarm relay 7

2A1

1D1

1D2

8D38D4

7D1

7D37D4

6D16D2

6D36D4

6A2

6A36A1Alarm relay 5

3C43C2Alarm relay 6 3C3

3D22D2

Alarm relay 8 3D32D3

Alarm relay 9 3D42D4

3C12C1

Alarm relay 10

3D12D1

Alarm relay 11

8A48A37A27A17A47A3

8D28D1

7D2

4B14B2

Binaryinput 2Binaryinput 3Binaryinput 4Binaryinput 5Binaryinput 6Binaryinput 7Binaryinput 8

Binaryinput 9Binaryinput 10

5A35A1

5A25A4

Commandrelay 2

Commandrelay 4

Commandrelay 5

4D34D1

4D24D4

4C34C1

4C24C4

5D35D1

5D25D4

5B35B1

5B25B4

Commandrelay 1

3B3

2B3

3B2

3B1

2C4

2C3

2C2

1C1

1C2

1

3

2

4

11

12

10

9

13

14

5354

51

52

7978

81

8382

8584

8786

555657585960

6162

80

1516

Version for panel flush mounting/cubicle mounting

5

6

7

8

88

67

6368

6564

667170699089

91

9392

969594

3536

3738

3940

4142

4344

9772

7398

4520

2146

4722

2348

4924

2550

9974

75100

76

77

Fibre–optic interfaceCoupling to central unit

V.24 interface (RS232C), 2 kV–isolatedCoupling to central unit



Dimension drawings in mm

Fig. 67SA511 (Version V3) with housing 7XP2040–2 (for panel flush mounting/cubicle mounting)

Front view Side view Panel cutout

206.5180

221

7.313.2

255.

8

245

266

231.5

30 29.5

1.5

5.4

225

220

244

172

10

Fibre–optic interface

Diam. 5 or M4

Diam. 6

Fig. 77SA511 (Version V3) with housing 7XP2040–1 (for panel surface mounting)

Front view Side view

260

27 29.526

6

71Z

280

344

234

219

Fibre–optic interface

126

1.539

40

cross section 20 x 60(without paint)

10051 75

5025

76

7.5

. . . . .. . . . .

. . . . .. . . . .

Detail Z:



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 provisions ofthe German Export List and the US Com-mercial Control List, export licences arenot required for the products listed in thiscatalog.

An export licence may however be requi-red due to country–specific application ofthe products.

Relevant are the criteria stated in the de-livery note and the invoice.

Subject to change without notice.

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!

The Power Transmission and DistributionGroup can also be found in the Internet:

http://www.ev.siemens.de

Responsible for

Technical contents: Michael Claus,Siemens AG, EV S V13, Nürnberg

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

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

A 9.91 a


Siemens LSA 2.1.11 . March 199716Siemens Aktiengesellschaft

BereichEnergieübertragung und -verteilungGeschäftsgebiet SekundärsystemePostfach 48 06D-90026 Nürnberg

Order No.: E50001-K5712–A211-A2–7600Printed in GermanyKG K 0397 3.0 SD 16 En 321 538 6101/U540

PowerTransmissionand Distribution

Documents

7SA5115 Distance Protection Relay V3