Overcurrent and Distance Relays
Siemens LSA 2.1.11 . March 1997 1
ApplicationThe 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 lowresis-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.
ConstructionWith 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 operationAll 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, highfrequencytransients and harmonics.
Serial interfacesThe 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 IEC8705103. 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 8705103 stan-dard.Remote operation of the distance protec-tion relay 7SA511 with the DIGSI soft-ware is possible if a modem is connectedto the FOserial interface.For existing systems, the Siemens-spe-cific protocol to DIN 19 244 is still avail-able.
SettingsAll 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-monitoringHardware 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
Overcurrent and Distance Relays
Siemens LSA 2.1.11 . March 19972
Distance protectionDistance 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 nondirectionalbackup 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 locatorFault location is provided through calcula-tion of the fault impedance. The distance-tofault may be output in ohms, kilome-ters or percentage of the line length.As an option, the fault location can beprovided by parallelline mutualcompensation, if the zerocurrent of theparallellines can be measured.
SIPROTEC 7SA511 distance protection relay (Version V3)
Fig. 2Characteristic of voltage-dependent overcurrent fault detector V PHE ( PH )
V PHE( >>)
V PHE( >)
> >> PH
V PHE
Fault detection
Fig. 3Characteristic of impedance fault detector (Z
Overcurrent and Distance Relays
Siemens LSA 2.1.11 . March 1997 3
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 fromshortcircuit or fault in the V.T. circuit, orif the V.T. c.b. trips.
Universal teleprotection interfaceFor 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 protectionThrough 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 forhighresistance 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 ARcycle) 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 protectionFor 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 2558 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 8705103interface.
SIPROTEC 7SA511 distance protection relay (Version V3)
Overcurrent and Distance Relays
Siemens LSA 2.1.11 . March 19974
Fault recordingThe digitized measured values of phasecurrents, earth current, phase voltagesand residual earth voltage, together withseveral binary channels, are stored withparameterizable pretrigger and postfault time. Storage of recorded fault datais batterybuffered 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 IEC8705103 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 inputsThe 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 functionsThe 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 VL1L2,
VL2L3, VL3L1, 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-cordsThe 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 IEC8705103 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 trippingThere 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.
SIPROTEC 7SA511 distance protection relay (Version V3)
Overcurrent and Distance Relays
Siemens LSA 2.1.11 . March 1997 5
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 DC20 to +15 %12 %Approx. 16 WApprox. 26 W50 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.LIYCYCY/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
SIPROTEC 7SA511 distance protection relay (Version V3)
Overcurrent and Distance Relays
Siemens LSA 2.1.11 . March 19976
Technical data
CEconformity, 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 (lowvoltage 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 electromagnetic 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 602556 for the lowvoltagedirective.
Insulation testsIEC 2555, DIN 57 435 part 303
Highvoltage test (routine test), except d.c. voltage supply inputHighvoltage 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
EMCtests; immunity (type test)Standards: IEC 2556, IEC25522
(international product standard)EN 500822 (generic standard)VDE 0435 part 303 (Germanproduct standard)
High frequency test with 1 MHz interferenceIEC 255221, class III and VDE 0435 part 303, class IIIElectrostatic dischargeIEC 255222, class III and IEC 100042, class IIIRadiofrequency electromagnetic field, nonmodulatedreport IEC 255223, class IIIRadiofrequency electromagnetic field, amplitude modulatedIEC 100043, class IIIRadiofrequency electromagnetic field, puls modulatedENV 50204, class IIIFast transientsIEC 255224 class III, IEC 100044 class IV
Conducted disturbances induced by radiofrequency fields, amplitude modulatedIEC 100046, class IIIPower frequency magnetic fieldIEC 100048, class IVIEC 2556
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
EMCtests; 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 C25 to +55 C25 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 255211, IEC 682
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
SIPROTEC 7SA511 distance protection relay (Version V3)
Overcurrent and Distance Relays
Siemens LSA 2.1.11 . March 1997 7
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) 1 VPhase-to-earth voltage VPHE () 1 VPhase-to-phase voltage VPHPH (>) 1 VPhase-to-phase voltage VPHPH () 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 800.1 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.
SIPROTEC 7SA511 distance protection relay (Version V3)
Overcurrent and Distance Relays
Siemens LSA 2.1.11 . March 19978
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; option2.5 % line length for 30 k 90 andVK/VN 0.1 without intermediate infeed
Power swing(devices with impedance starting Z/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 infinite5 %
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 detectionVPHE < (faulted phase) 1 VVPHE > (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 0.1Measurement tolerance (according to VDE 0435, Part 303 for sinusoidal quantities)
10 to 100 V10 to 100 V5 % of set value
Active/reactive power measurement3 to 1 000 mA0 to 5 in 2 operating points10 % of set value
Sensitive earth-fault protection(highresistance 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
Undirectionalearth-fault protection with inversetime 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 ineffective1 % of set value or 10 ms
Normal inverseVery inverse, Extremely inverse0.1 to 40 to 32 s
5 to 15 % of set value5 % 15 ms for 2 (/E>) 20 and 1 s tIE 30 s
SIPROTEC 7SA511 distance protection relay (Version V3)
Overcurrent and Distance Relays
Siemens LSA 2.1.11 . March 1997 9
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 minmax, mean, with max50 to 100 %0.1 to 4
Tripping time characteristic t n2 2pre
2 ( k N )2
Reset conditions/Off/AlarmAlarm
Tolerances
Approx. 0.99Approx. 0.99Approx. 0.99Class 10 % to IEC 2558
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 / 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
Pretrigger time Step 0.01 sPostfault 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, L3VL1L2, VL2L3, VL3L1, VL1, VL2, VL3P, Qf0 to 240 % N, 0 to 120 % VN,0 to 120 % PN, 96 to 104 % fNea, er / trip2 % of respective rating
SIPROTEC 7SA511 distance protection relay (Version V3)
Overcurrent and Distance Relays
Siemens LSA 2.1.11 . March 199710
Selection and ordering dataOrder 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 8705103 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 fibreoptic 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)
7XS50200AA007XS50201AA007XS50210AA007XS50211AA007XV51002
Documentation
German: Katalogblatt LSA 2.2.11: Abzweigschutz SIPROTEC 7SA511 (Version V3)Handbuch: Abzweigschutz SIPROTEC 7SA511 (Version V3)
E50001K5712A211A2C53000G1100C983
English: Catalog LSA 2.2.11: SIPROTEC 7SA511 distance protection relay (Version V3)Manual: SIPROTEC 7SA511 distance protection relay (Version V3)
E50001K5712A211A27600C53000G1176C983
1) Only available with impedance starting (Z
Overcurrent and Distance Relays
Siemens LSA 2.1.11 . March 1997 11
Function scope of special device ver-sionsSpecial device versions can be suppliedfor specific applications. The followingfunctions are available in all versions:Fault location, thermal overload protec-tion, load values, overcurrenttime anddefinite time overcurrent protection,
current, voltage, active power, reactivepower, frequency measurement, switch-ing statistics with summation of inter-rupted currents per pole, integratedclock, batterybuffered 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
+
++
++
+++
+++
Parallelline mutual compensation for fault locationPower swingTeleprotection interface
+
+
+
+++
+++
Emergency definite time overcurrent protection for measuring voltage failureThermal overloadEarthfault detection in non-earthed network
++
+++
++
++
++
Backup earth-fault protection (earthed network)Reclosing, 3-poleReclosing, 1/3-pole
+
++
+
+++
Synchronism checkProtection for switchontofaultFault recording
++
+++
+++
+++
+++
Parameter changeover facilityTransient earthfault detectionFault location output, analog/BCD
oo
+oo
+oo
+oo
+oo
+ Function included Function not includedo Function possible with add-on
SIPROTEC 7SA511 distance protection relay (Version V3)
Overcurrent and Distance Relays
Siemens LSA 2.1.11 . March 199712
Selection and ordering data for the special device versionsOrder 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 versionMediumvoltage version: isolated, compensated, earthed network (sensitive current transducer for E)
earthed networkHighvoltage version: isolated, compensated network
earthed network
13322
01022
AFFFG
00213
Serial interfaceWithoutIsolated, V.24/RS232CIntegrated fibreoptic interface
ABC
Accessories for the distance protection relay 7SA511Order 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
SIPROTEC 7SA511 distance protection relay (Version V3)
Overcurrent and Distance Relays
Siemens LSA 2.1.11 . March 1997 13
SIPROTEC 7SA511 distance protection relay (Version V3)
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 earthfault detection
in compensated or isolated systems2) Vx input usable depending on function
en voltage 2 voltage for synchronism check
L1L2L3
E
V L1V L2V L3V N
V L1
V L2
V L3V 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
Fibreoptic interfaceCoupling to central unit
V.24 interface (RS232C), 2 kVisolatedCoupling to central unit
Overcurrent and Distance Relays
Siemens LSA 2.1.11 . March 199714
Dimension drawings in mm
Fig. 67SA511 (Version V3) with housing 7XP20402 (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
Fibreoptic interface
Diam. 5 or M4
Diam. 6
Fig. 77SA511 (Version V3) with housing 7XP20401 (for panel surface mounting)
Front view Side view
260
27 29.526
6
71Z
280
344
234
219
Fibreoptic interface
126
1.539
40
cross section 20 x 60(without paint)
10051 75
5025
76
7.5
. . . . .. . . . .
. . . . .. . . . .
Detail Z:
Overcurrent and Distance Relays
Siemens LSA 2.1.11 . March 1997 15
Conditions of Sale and DeliverySubject 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 RegulationsIn 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 countryspecific application ofthe products.
Relevant are the criteria stated in the de-livery note and the invoice.
Subject to change without notice.
TrademarksAll product designations used are trade-marks or product names of Siemens AGor of other suppliers.
DimensionsAll 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, Nrnberg
General editing: Roland Reichel/Claudia KhnSutiono,Siemens AG, EV S SUP22, Nrnberg/EV BK T, Erlangen
Conditions of Sale and Delivery Export Regulations Trademarks Dimensions
A 9.91 a
Overcurrent and Distance Relays
Siemens LSA 2.1.11 . March 199716Siemens Aktiengesellschaft
BereichEnergiebertragung und -verteilungGeschftsgebiet SekundrsystemePostfach 48 06D-90026 Nrnberg
Order No.: E50001-K5712A211-A27600Printed in GermanyKG K 0397 3.0 SD 16 En 321 538 6101/U540
PowerTransmissionand Distribution