Differential RelaysSiemensLSA2.2.3 .April 2000 1ApplicationThe 7SD511/512 current comparisonprotection units are for fast and selectiveshort-circuit protection of cables andoverhead lines of all voltage levels. Thecombination of dynamic and steady-statemeasurement makes the current comparison protection sensitive to internal high-resistant faults and extremely stable during short-circuit through currents.Neither the treatment of the networkneutrals nor the load current has an influence on the short-circuit sensitivity. Thedigital transmission of protection datanormally occurs via fibre optics. The integrated optical interfaces facilitate a directconnection up to 30 km. In addition anisolated V.24 interface (RS 232C) permitsthe connection to a powerful optoamplifier or a PCM transmission unit. Theprotection also includes an integratedthermal replica for monitoring the current-induced heat losses and the datatransmission and an emergency overcurrent protection. In addition the 7SD512has an automatic-reclosure function. Thedevices can interface with conventionalswitchgear systems or alternatively beintegrated in the modern substation control system SINAUT LSA.ConstructionThe units are of compact design and include all components for the measuredvalue formation and evaluation, operatorpanel and display field, alarm and trip outputs, binary input option, serial interfacesand auxiliary voltage DC/DC converter.The device can be supplied in three casevariations. The model for panel surfacemounting is supplied with two-tier terminals accessible from the front. Thevariants for panel flush mounting orcubicle mounting have rear connectionterminals and are available with orwithout glass cover.Mode of operationThe 7SD51 current comparison protectionunits have fully digital measurement processing from the scanning and digitisation of measured values to the trip decisions for the circuit-breakers.Digital measurement methods largelysuppress the influence of high-frequencytransients, transient DC components, anddiffering current transformer saturationlevels.FeaturesD Selective short-circuit protection forcables and overhead linesD Overload protection with thermal characteristicD Digital transmission of protection datavia fibre optics or serial based communication networksD Circuit-breaker intertripping and remote trip signal transfer. Four remotesignalsD Marshallable binary inputs. LEDsalarm and trip relaysD Operational current measurement oflocal and remote CT's currentD Up to eight fault recordsD Commissioning aidsD Monitoring the protection data transmission. Measuring of delay-time andautomatic correction of delay-timeavailable.D Emergency overcurrent-time protection in case of loss of the data transmission.D Integrated single and three-pole autoreclose function for 7SD512D Substation control interface (Siemensspecific) or according IEC60870-5-103 interface (standard ofthe Association of German Power Utilities) to substation control system.7SD511/512 Current comparison protection relay (Version V3) for overhead lines and cablesFig. 17SD51 current comparison protection7SD512 7SD51187L497950/5151N87L4950/5151NScope of functions Scope of functionsSiemensAG2000eDifferential RelaysSiemensLSA2.2.3.April 2000 2Serial interfacesThe unit includes three serial interfaces.The operator interface at the front is suitable for connection of a personal computer with WINDOWS capability. An operator program DIGSI is available forconvenient and clear relay setting, analysis of fault recordings and event recordings as well as for commissioning.The substation control interface is available as an 820 nm fibre optic interfacefor connection to either the substationcontrol system or to a central protectiondata unit (protocol either acc. to Siemensspecifications or - as an option - acc. toIEC 60870-5-103).The interface to the remote line end isdesigned as a fibre optic interface for thehigh security transmission of informationvia fibre optic cable (protocol according toDIN 19 244 with Hamming distanced = 4 ). As integrated optic transmitter a820 nm or 1300 nm interface is available.Optionally, an isolated V.24 interface(RS 232C) permits connection to a powerful optoelectric converter or PCM transmission units with 14.4/19.2 kbaudasynchronous data inputs and outputs.SettingsAll setting parameters can be input viathe integrated operator panel and displayfield or via a PC under user control. Theparameters are written into non-volatilememories so that the settings are secureeven during interruption of the supplyvoltage.SelfmonitoringHardware and software are continuouslymonitored and any irregularities are immediately detected and alarmed. Thus,the security, reliability and availability aresignificantly improved.7SD511/512 Current comparison protection relay (Version V3) for overhead lines and cablesFig. 2Steady-state tripping characteristicLoad current or throughshort-circuit current7SD51 7SD51I1I21-1 1-1ISTATINISTATINI2INI1INTripTrip-2-2 22Fig. 3Dynamic tripping characteristic7SD51 7SD51I1I2Steady-state load orshort-circuit current121 2IDYNSwitchInINDI1INIDYNINIDYNSwitchonINIDYNINDI2INTrip-2Trip-1-2 -1Differential RelaysSiemensLSA2.2.3 .April 2000 3Current comparison protection forcables and overhead linesThe 7SD511/512 current comparisonprotection units have the following features:D Measurements are performed separately for each phase; thus, the tripsensitivity is independent of the typeof faultD Dynamic measurement method withhigh sensitivity below rated current enables the recognition and disconnection of high-ohmic short-circuits evenwith large through load currents (asper Fig. 3).D Steady-state measurement methodwith tripping characteristic (as perFig. 2).D When the line is switched in, the dynamic tripping characteristic can berendered less sensitive for four cyclesvia a setting valueIDYN SWITCH-IN (asper Fig. 3).D Insensitive to DC current componentsand transformation errors of currenttransformersD Insensitive to high-frequency transienteventsD High stability during external faultseven with different current transformer saturation levels.Digital transmission of protection datato the remote line end via fibre opticsThe data required for the current comparison principle are cyclically exchanged induplex mode in the form of frames between the protection units. The framesare secured with a hamming distancesufficient for fibre transmission and communication networks.The data transfer has the following advantages:D Insensitive to electromagnetic interferenceD Extra isolation not required (isolatingtransformers as required for transmission of analog protection data are notnecessary)D Supervision of the entire transmissionpath between the protection unitswithout additional equipment.D Especially for communication-network-applications the automatic delaymeasurement and the correction ofthis delay in the differential-trip decision is included in the relay.Circuit-breaker intertripping and remote trip signal transferIf weak input conditions at the oppositeline end are present, then that circuit-breaker can be disconnected via thesame protection data transfer channel. Aremote trip signal can also be transferredto the remote line end from, for example,a circuit-breaker back-up protection or atransformer differential protection via abinary input.In addition up to four binary input eventsare signalled at the remote with closed/open contacts.Thermal overload protectionA built-in overload protection with analarm stage is provided for the thermalprotection of cables.The trip time characteristics (Fig. 4) areexponential functions according toIEC 60255-8 and consider the current-initiated heat losses from the operationalcurrents as well as the simultaneouscooling effect of the coolant. The preloadis thus considered in the trip times foroverloads.An adjustable alarm stage can initiate analarm before tripping is initiated.7SD511/512 Current comparison protection relay (Version V3) for overhead lines and cablesFig. 4Trip time characteristics of the overload protection function10010502053210,50,30,20,10,050,031 2 3 4 5 8 1010005001005010 5 110010502053210,50,30,20,10,050,031 2 3 4 5 8 101000500100501051t (min) Parameter:Setting valueTime constantt (min)without preloadIk@INt (min) Parameter:Setting valueTime constantt (min)with 90 % preloadIk@INDifferential RelaysSiemensLSA2.2.3.April 2000 4Overcurrent-time protection as emergency functionImmediately after loss of data transmission to the remote line end both relayscan work as overcurrent-time protectionrelays, alternatively in definite-time orinverse time overcurrent protectionmode. Both the definite-time and the inverse time overcurrent protection modeshave two levels of operation, i. e. apartfrom the overcurrent level (I>) a high-setelement (I>>) is also provided. In both,the definite-time and the inverse timeovercurrent protection modes, the high-set element has a definite-time overcurrent characteristic. As soon as the datatransmission works again the currentcomparison protection is automaticallyswitched on.Auto-reclose functionThe relay 7SD512 has an auto-reclose(AR) facility. The range of functions include:D Three-pole AR for all fault typesD Single-pole AR for single-phase faults,no reclose for multi-phase faultsD Single-pole AR for single-phase faultsand three-pole AR for multi-phasefaultsD Multi-shot ARD Integration with external AR equipment with communication via binary(contact) inputs and outputsD Control by an external protectionscheme.Fault recordingThe digital measured values for thephase and earth currents are stored before fault inception and after fault inception. This data can be transferred eitherto the coordinated substation control system SINAUT LSA or to a PC for analysis.If the IEC 60870-5-103 standard interface is used, up to 8 fault recordings canbe stored. The data memory is organizedas a circular buffer with a maximumlength of 5 s (at fN = 50 Hz). The oldestfault recordings are overwritten by themost recent. A fault recording can alsobe started via a binary input or, as an aidto commissioning, via the integrated operator panel or PC. The recording durationcan then be parameterized.IndicationsThe 7SD511/512 units provide detaileddata for the analysis of faults and checking states during operation. The followingindication memories are backed upagainst power failure.D Fault indicationsThe last three fault logs can be called.If a fault occurs again, the oldest faultis overwritten.D Operational indicationsAll indications and states that occurare stored in the circular buffer. Moreover there is an operational analogvalue display. This is an LC display onwhich any two operational analogvalues can be displayed.Marshalling of command and alarm/event relays, LEDs and binary inputsAll input/output relays and indicatingLEDs may be functionally allocated according to the user's requirements.CommissioningDue to the digital signal transmission tothe remote line end, commissioning effort is reduced by measurement and indication of:D Load currents of the local and remotestationD Transfer time of signals from one station to the other (delay time measurement)D Phase sequence of the local stationD Phase allocation of the conductors between the stationsD Test mode, that can be activated by abinary input signal. This mode allowsthe testing of the local relay withouteffecting the remote relay.This enables the current transformer connections, the polarity of the current transformers, phase sequence and phase allocation to be tested from the one end.Via binary input a test-mode can be activated. For this, the remote station is informed that local tests are running. Thus,an unwanted OFF-command is prevented when during local tests differential values are received.Real time clock, Battery bufferedannunciationsThe VDEW add-on (VDEW is theAssociation of German Power Utilities)contains a battery-backed quartz clockthat can be synchronized for each binaryinput. Moreover, the operational and faultindications and the LED display arestored in a non-volatile memory.7SD511/512 Current comparison protection relay (Version V3) for overhead lines and cablesDifferential RelaysSiemens LSA2.2.3.April 2000 5Technical dataInput circuits RatedcurrentINRatedfrequency fNcanbeparameterizedOverloadcapacityofcurrentinputs,thermal continuous10s1sdynamic;half-cyclePowerconsumptionofcurrentinputs atIN=1AatIN=5A1or5A50or60Hz4xIN30xIN100xIN250xINor earthIE>Highsetcurrent phaseI (DMT)orearthIE (DMT)Timemultiplier tpPick-upvalueCharacteristicsaccordingtoIEC60255-4,paragraph3.5.2orBS142LinearcurrentrangeTolerancesPick-upvalueTimeIp / IN=0.1to4I/IN=0.1to15or0.1to10respectively0.05to3.2s1.1xIpnormal inverse,veryinverse,extremelyinverse20xIN"5%v5%for2 v(I/IP>) v20and tp=1Load monitoring OperationalcurrentsMeasurementrangeToleranceOverloadprotectionvaluesConductor temperatureMeasurementrangeToleranceIL1;IL2;IL3;IE0to240%INv2%ofratedvalueQ/Qtripcalculated0to240%v3%referredtoQtripFault event recording Faultevents storageofthelastthreefaulteventsFault recording Phasecurrents(instantaneousvalues)ResolutionofinstantaneousvaluesRetentiontimeStartsrecordingoniL1; iL2; iL3; iE1.66at fN=50Hz1.39at fN=60Hzmax.8in19srecordingbufferEnergizing,PC/LSAoperation,tripping,binaryinput7SD511/512 Current comparison protection relay (Version V3) for overhead lines and cablesDifferential RelaysSiemensLSA2.2.3.April 2000 8SelectionandorderingdataOrder No.7SD511/512currentcomparisonprotectionrelay 7SD51 j j- j jAj j- j jA 0Auto-reclose functionwithout auto-reclose function (AR)with single and three-pole auto-reclose function (AR)12Rated current for 50/60 Hz AC1 A5 A15Auxiliary voltage supply24, 48 V DC60, 110, 125 V DC220, 250 V DC245Constructionfor panel surface mountingfor panel flush mounting or cubicle mountingfor panel flush mounting or cubicle mounting, without glass coverBCECountry-specific presetting/languageGerman/English/Spanish presetting 0With real-time clock, with non-volatile memory, software version V3 2Interface for protection data transmission to the remote stationwired, 2 kV isolated interface, V.24 (RS 232C)Fibre optic interface, 820 nm (maximum length 1.5 to 2 km)Fibre optic interface, 1300 nm (maximum length 30 km)012System interface/substation control interfacewithoutwith fibre optic interface, 820 nm (maximum length 1.5 to 2 km)ACAccessoriesBestell-Nr.Opto electricalconverter(fibre-optictoasynchronousRS232)7XV5652-0AA00Constriction for wall mounting and top hat mountingOptical820nm/1300nmconverter 7XV5451-0AA00820 nm/1300 nm converter for hat rail mounting in EG90 housing. FSMA connectors for multimode side (820 nm).ST connector for singlemode fibre(1300 nm side). Max. distance 14 km (9 dB).Operationsoftware 1)DIGSI program (suitable for all protection relays 7UM..., 7UT..., 7SJ..., 7SA..., ...) GermanEnglishTest version: GermanEnglishConnecting cables for protection relays (25pin) - PC (9pin); (other variations supplied on request)7XS5020-0AA007XS5020-1AA007XS5021-0AA007XS5021-1AA007XV5100-2Documentation German: Katalogblatt: Stromvergleichsschutz 7SD511/512 (Version V3) fr Leitungen und KabelHandbuch: Stromvergleichsschutz 7SD511 (Version V3) fr Leitungen und KabelStromvergleichsschutz 7SD512 (Version V3) fr Leitungen und KabelE50001-K5722-A131-A3C53000-G1100-C104-4C53000-G1100-C105-3English: Catalog: 7SD511/512 current comparison protection relay (Version V3) for overhead lines and cablesManual: 7SD511 current comparison protection relay (Version V3) for overhead lines and cables7SD512 current comparison protection relay (Version V3) for overhead lines and cablesE50001-K5722-A131-A3-7600C53000-G1176-C104-4C53000-G1176-C105-3Spanish: Catlogo:Proteccn por comparacin de fases 7SD511/512 (version V3) para lneas y cables E50001-K5722-A131-A2-78007SD511/512Currentcomparisonprotectionrelay(VersionV3)foroverheadlinesandcablesDifferential RelaysSiemensLSA2.2.3 .April 2000 97SD511/512Currentcomparisonprotectionrelay(VersionV3)foroverheadlinesandcablesFig. 5Applications1. Directopticallinkwithfibre-cableand820nmopticalinterface2. Directopticallinkwithfibre-cableand1 300nmopticalinterface.7SD51 7SD518 dB permissible attenuation (1.5 to 2 km)with 62.5/125m multimode fibre7SD51xx-xxA02-1xA0FSMA connector,820 nm interface7SD51 7SD5121.5 dB permissible attenuation (max. 30 km)with 9/125m monomode fibre7SD51xx-xxA02-2xA0FC/PC connector1300 nm interface7SD51xx-xxA02-2xA07SD51xx-xxA02-1xA03. Recommendedopticallinktoacommunication device(e.c.PCM30,modemetc.)7SD518 dB permissible attenuation(1.5 to 2 km) with 62.5/125mmultimode fibreFSMA connector,820 nm interfaceCommunicationdeviceoeLink toremoterelayopto-electricalconverter with DCpower supplyTxDRxDGNDAsyn. RS232 interface14.4/19.2 kBaud(8N1, 8E1), withoutflow-control7SD51xx-xxA02-1xA07XV5610-0AA00 (wall mounting)7XV5611-0AA00 (top hat rail mounting)Differential RelaysSiemensLSA2.2.3 .April 2000 107SD511/512 Current comparison protection relay (Version V3) for overhead lines and cablesFig. 6Applications4. Electrical link to a communication device/short distance5. Link to a 7VR50 device7SD512 kV isolatedinterfaceCommunicationdeviceLink toremoterelaydata frame 8E1, or 8N1 without flow controlTxDGND7SD518 dB permissible attenuation(1.5 to 2 km) with 62.5/125mmultimode fibreFSMA connectorAsyn. RS232 interface 14.4/19.2 kBaud, max. 15 mRxD7SD51xx-xxA02-0xA0Note:If communication device do not withstand EMC IEC 60255-1...5, application is not recommended, since communication device may be damaged due to EMC-stress.oe7VR50Communication devicefor protectionapplications.4 x4 xBinary inputs andtrip contacts or additional opto-electricinterface.Electrical G703 or X21interface to other communication devicesLong distancefibre optic linkwith multimodefibre (80 - 100 km)7SD51xx-xxA02-1xA0Differential RelaysSiemensLSA2.2.3 .April 2000 117SD511/512 Current comparison protection relay (Version V3) for overhead lines and cablesFig. 7Connection diagram for 7SD511 current comparison protection relayL1 L2 L3L1L2L3L1L2L3NBinary inputs, alarm relays, trip relays and LEDsare freely assignableCCP=Current Comparison Protection for lines1) When the integrated 1300 nm optomodule isordered the V.24 interface (RS 232C) is supplied ready wired with the optomodulePower supply7SD5118A28A1Verion for panel flush mounting/cubicle mountingVerion for panel surface mounting3334Remote trip8A48A335367A27A148497A47A350513A13A2152A12A2261A11A2371B11B2 87B16B18B1Alarm relay 1Alarm relay 2Alarm relay 3Alarm relay 43937387B26B28B24240417B36B38B34543447B46B48B45452536A36A26A15755565B1 125B4 285B3 275B2 135A1 145A429 5A3305A2 15Trip relay 1Trip relay 24B1 104B2 11L+L-Remote ResetLEDBlock trip CCPLocal tripTripCCP intertrippingreceleveData transmission failureDevice operativeCCP blockedTrip commandTrip commandBinary input 1Binary input 2Binary input 3Binary input 4L1L2L3NIL1IL2iL3ieL (-12 V)3B3 253B4 263B1 233B2 244B34B42122Coupling to remote line end,either optic interface or V.24 interface (RS 232C), 2 kV isolated1)16Coupling to central unit,fibre optic interface4A 4A3B 3BRxDMRL (+12 V)TxDMTAlarm relay 54Differential RelaysSiemensLSA2.2.3.April 2000 127SD511/512 Current comparison protection relay (Version V3) for overhead lines and cablesFig. 8Connection diagram for 7SD512 current comparison protection relayCCP intertrippingreceiveClose commandTrip commandTrip command L1Trip command L2Trip command L3L1 L2 L3L1L2L3Binary inputs, alarm relays, trip relays and LEDsare freely assignableCCP=Current Comparison Protection for lines1) When ording the external 1300 nm optomodule the V.24 interface (RS 232C) is suppliedready wired with the optomodule8L (-12 V)Powersupply7SD5128A28A1Version for panel flush mounting/cubicle mountingVersion for panel surface mountting5354Remote trip8A48A355567A27A157587A47A359603A13A2152A12A2261A11A2371B11B2Binaryinput 17B16B18B1Alarm relay 1Alarm relay 2Alarm relay 3Alarm relay 4656364Alarm relay 57B26B28B26866677B36B38B37169707B46B48B49088896A36A26A1939192Trip relay 13B3 133B4 143B1113B2124B14B2 164B34B4L+L -Remote ResetLEDBlock CCPLocal tripiL1iL2iL3ieTripData transmissionfailureDevice operativeCCP blocked910Binaryinput 2Binaryinput 3Binaryinput 48D28D16162C.B. aux.contact8D48D378797D27D180817D47D38283C.B. readyAR blockManual close6D26D18485AR on6D46D38687AR offBinaryinput 5Binaryinput 6Binaryinput 7Binaryinput 8Binaryinput 9Binaryinput 103C43C33C2Alarm relay 6969495AR inoperativeAlarm relay 73D22D23536 Trip L1Alarm relay 83D32D33738 Trip L2Alarm relay 93D42D43940 Trip L3Alarm relay 103C12C14142 not allocatedAlarm relay 113D12D14344Lock C.B. alarmTrip relay 2Trip relay 35B1 745B2 755B3 995B4 100Trip relay 45A1 725A2 735A3 975A4 98Trip relay 54D1 204D2 214D3 454D4 464C1 224C2 234C3 474C4 485D1 245D2 255D3 495D4 5026L1L2L3NL1L2L3N4A 4A3B 3BRxDMRL (+12 V)15TxDMT4Coupling to remote line end, fibreoptic interface or V.24 interface(RS 232C), 2 kV isolated1)Coupling to central unit,fibre optic interfaceDifferential RelaysSiemensLSA2.2.3 .April 2000 13Dimension drawings in mmFig. 97SD511 with housing 7XP2030-2 (for panel flush mounting or cubicle mounting)Front view Side view Panel cutout131.51051467.313.2255.8245266231.530 29.51.55.415014510Fibre opticconnection244172Diam. 5or M4Diam. 6Fig. 107SD512 with housing 7XP2040-2 (for panel flush mounting or cubicle mounting)Front view Side view Panel cutout206.51802217.313.2255.8245266231.53029.51.55.422522024417210Fibre opticinterfaceDiam. 5or M4Diam. 6Fig. 117SD512 with housing 7XP2040-1 (for panel surface mounting)Front view Side view26027 29.526671Z280344234219Fibre optic interface1261.53940Cutout 20 x 60(without paint)10051 755025767.5. . . . .. . . . .. . . . .. . . . .Detail Z:Front view2803441591441166031 45301546. . . . .. . . . .. . . . .. . . . .Differential RelaysSiemensLSA2.2.3.April 2000 14Conditionsof 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.JThe technical data, dimensions andweights 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 Commercial Control List, export licences arenot required for the products listed in thiscatalog.An export licence may however be required due to country-specific application ofthe products.Relevant are the criteria stated in the delivery note and the invoice.Subject to change without notice.TrademarksAll product designations used are trademarks or product names of Siemens AGor of other suppliers.DimensionsAll dimensions in this catalog are given inmm.Responsible forTechnical contents: Norbert Schuster,Siemens AG, EV S V13, NrnbergGeneral editing: Claudia Khn-Sutiono,Siemens AG, EV BK T, ErlangenConditions of Sale and DeliveryS Export RegulationsS TrademarksS DimensionsA 9.91 awww.ev.siemens.dePublished bySiemens AktiengesellschaftPower Transmission and Distribution GroupProtection and Substation Control Systems DivisionPostfach 48 0690026 NrnbergDEUTSCHLANDOrder No.: E50001K5722-A131A3-7600PrintedinGermanyKGK050014EnIntranet