catalog 7sd52 en

Protection Systems

Catalog SIP 5.3 � 1.0

SIPROTEC 47SD522/523Multiterminal Differential Relayfor Two-Six Line Terminals

Siemens Aktiengesellschaft Subject to change without notice Ordering No: E50417-K1176-C114–APrinted in Germany

Power Transmission andDistribution GroupProtection and SubstationControl Systems DivisionP.O. Box 48 06D-90026 Nuremberghttp://www.ev.siemens.de

SIPROTEC 47SD522/523

Multiterminal Differential Relayfor Two-Six Line Terminals

Protection Systems

Functions Pages 12 to 16

Typical connection Page 17

� Siemens AG 2000

Description/Overview Pages 2 to 11

Technical data Pages 18 to 26

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Selection andordering data Pages 28 to 31

Firmware V4

Catalog SIP 5.3 • 1.0

Accessories Page 32

Connection diagrams Pages 33 to 38

Dimension drawings Pages 39 to 41

SIPROTEC 4 – 7SD522/523Multiterminal Differential Relay for Two-Six Line TerminalsDescription

Application

The 7SD522/523 relays provi-des full scheme differentialprotection and incorporatesall functions usually requiredfor the differential protectionof transmission lines. It´s de-signed for all transmissionand distribution levels andprotects lines with two up tosix terminals. The relay is de-signed to provide fast andphase-selective fault clearan-ce. The relay uses fiber opticcables or digital communica-tion networks to exchangedifferential data and includesspecial features for the usein multiplexed communi-cation networks. This contri-butes towards improvedsecurity and availability of theelectrical power system.The 7SD522/523 is suitablefor single- and three-phasetripping applications for twoup to six line ends. It alsohandles with transformersand reactors within the pro-tected zone and is wellsuited for serial compensa-ted lines. The relays may beemployed with any type ofsystem grounding.The effect of communicationnetwork delay times is con-sidered and compensated forthe differential measure-ment.The serial interfaces to thedifferential relays are flexibleto adapt to the needs of mul-timode or monomode fiber orthe communicationnetworks. A change in thecommunication method doesnot force the replacement ofthe relay because flexiblecommunication modules maybe applied after installation.

Maximum Lifetime and

Reliability

The 7SD52 hardware is ba-sed on 20 years of experi-ence by Siemens applyingnumerical protection. State-of-the-art 32 bit microproces-sor technology is employed.The device complies with thelatest standards andtechniques for transient re-sistance and electromagneticcompatibility. The number of

electronic components issubstantially reduced byusing large-scale integratedcircuits which provide highaccuracy and are driftresistant.The relay software is de-signed in accordance withhigh level programming lan-guage techniques. The longexperience in manufacturingnumerical relays provide thebasis for an efficient soft-ware structure. This, alongwith modern manufacturingtechniques and quality con-trols, assure maximum lifeti-me and reliability.

Cost-effective powersystem management

The SIPROTEC 4 units arenumerical relays which alsoprovide control and monito-ring functions and thereforesupport cost-effective powersystem management. Theycontribute towards the relia-ble supply of electric powerto the customers.Local operation has been de-signed according to ergono-mic criteria. Easy-to-read dis-plays are a major design aim.The SIPROTEC 4 units havea uniform design and anenhanced degree of functio-nality which represents awhole new level of protec-tion and control. If the appli-cation requirements changethe relays may be adapted byentering new settings orlogic without any additionalhardware costs.The use of powerful micro-controllers and the applica-tion of digital measured valueconditioning and processinglargely suppresses the influ-ence of higher-frequencytransients, harmonics andDC components.

Complementary protection

The unit can also be used ascomplementary differentialfor all types of distance pro-tection equipment.

Additional protective

functions

The 7SD522/523 incorpo-rates several protective func-tions usually required fortransmission line protection.These are� Phase overcurrent protec-

tion (backup or emergencyfunction)

� STUB bus overcurrent forbreaker and one half, ringbus, and other sharedbreaker schemes with stubdisconnect switch

� Phase selectiveintertripping

� Automatic reclosure single/three pole

� Overload protection.

Programmable logic

The integrated programma-ble logic functions allow theimplemention of functionsfor the automation ofswitchgear (interlocking) or asubstation via a graphic userinterface. You can also gene-rate user-defined messagesand logical combinations of

internal or external signals(control inputs, elements,metering data, etc.).Differential communication/ Local and remotecommunication

The SIPROTEC 4 units provi-de several serial communica-tion interfaces for varioustasks:� Front interface for connec-

ting a PC� IEC system interface for

connecting to a controlsystem viaIEC 60870-5-103

� Interfaces for Ethernet(UCA), PROFIBUS FMS/DP, MODBUS RTU,DNP3.0 1)

� Modem interface for con-necting a PC via modemand/or port switches

� Time synchronization viaIRIG-B or DCF77

� The 7SD52 relay has twoadditional optical interfacesfor protection communica-tion with the remote differ-ential relays.

2 Siemens SIP 5.3 · 1.0

1) in preparation

Continuous self-monitoring

The hardware and softwarecomponents are continuouslymonitored. If abnormal condi-tions are detected, the unitsignals them immediately. Inthis way, a high level of safe-ty, reliability and availability isachieved. If the protection iscompromized, the relay willblock tripping and revert toB/U o/c if enabled and avail-able.

Reliable batterymonitoring

The internal battery is usedto back-up the clock, switch-ing statistics, event logs andfault recording in the event ofa power supply failure. Itsfunction is checked by theprocessor at regular inter-vals. If the capacity of thebattery is found to be declin-ing, an alarm is generated.Routine replacement istherefore not necessary. Allprotection and other settingparameters are stored in theFlash-EPROM, and thereforenot lost if the power supplyor battery fails.

User-friendly localoperation

Many advantages can alreadybe found on the clear anduser-friendly front panel:Positioning and grouping ofthe keys support the naturaloperating process.A large non-reflective back-litdisplay provides clearinformation display.

Programmable (freely assign-able) LED’s for importantmessages are provided. Ar-row keys ensure an easy na-vigation in the function tree.Operator-friendly input of theset values via the numerickeys or DIGSI 4 is providedas well as fourprogrammable keys forfrequently used functions atthe push of a button.

Siemens SIP 5.3 · 1.0 3

Operational data and faultdata with time stamp

The SIPROTEC 4 units pro-vide extensive data for faultanalysis as well as control.All indications listed beloware protected against loss ofpower supply.� Fault recording:

The last eight faultrecordings are alwaysstored in the unit. All faultrecordings are timestamped with a resolutionof 1 ms (digitaloscillography).

� If the voltages are con-nected to 7SD52, the faultrecording includes thephase and calculatedground voltages. Also dif-ferential and restrainedcurrent are written in afault event buffer.

� Event LogAll Events (e.g. operatingor switching actions) arestored in the event log.The time resolution is1 ms.

Operational measuredvalues

The large scope of measuredvalues permits improved sy-stem management as well assimplified commissioning.7SD52 provides local and re-mote measurements.This includes low currents,calculated ground current,sequence components, re-mote phase magnitudes andangles for all terminals.

Commissioning

A special PC-based programrunning within a standardbrowser provides currents,voltages and phasors to sup-port simple commissioningof the relays. This allows alsoremote access during normaloperation.

Control

The integrated control functi-ons permit control of circuitbreakers or isolators (electri-cally operated/motorized dis-connectors) via the integra-ted operator panel, binary in-puts, and DIGSI 4.A full range of control execu-tion functions is provided,such as select-before-operate.

Time synchronization

A battery buffered clock isprovided and can be synchro-nized via a synchronizationsignal (IRIG-B via satellitereceiver), binary input, sy-stem interface or SCADA. Adate and time is assigned toevery event.As a special feature the7SD52 allows the timesynchronization viacommunication links of therelays linked together in thedifferential scheme. In thisway all relays are workingand storing events based onthe same absolute timebasis. That makes eventseasily and accuratelycomparable within thedifferential scheme.

Assignable control inputsand contact outputs

Control inputs, contact out-puts and LEDs can be as-signed to specific functions.

Selectable function keys

Four function keys can be as-signed to permit frequentlyrecurring actions very quicklyand simply.Typical applications are:jumps to a given position inthe menu tree in order to dis-play the event log or to per-form automatic functions,such as ”Switching ofcircuit-breaker”, hot line tag-ging, reclose blocking, etc.

SIPROTEC 4 – 7SD522/523Multiterminal Differential Relay for Two-Six Line TerminalsDescription

Local operation

All operator actions can beperformed and informationdisplayed via an integrateduser interface (HMI).

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On the LCD display,substation and device in-formation can be displayedas text in various lists.Frequently displayed infor-mation includes measuredand calculated analog values,information about the stateof the switchgear and therelay, protection information,general indications andalarms.

14 assignable (configurable)LEDs are used to displaysubstation or device informa-tion. The LEDs can be la-belled according to theapplication requirements.An LED reset key resets theLEDs.

4 configurable function keyspermit the execution offrequently used actions sim-ply and fast. Typical applica-tions include jumps to cer-tain points in the menu treeto display the operationalmeasured values, or execu-tion of automatic functionssuch as: ”CB ManualCLOSE”.

RS232 local PC interface

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Numerical keys for easy data entry

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Figure 1

Front view of a SIPROTEC, standard relay

Keys for navigation


Description

Connection techniques andhousing with many advan-tages

1/2 and full-rack sizes: Theseare the available housingwidths of the SIPROTEC 47SD522/523 relays, referredto a 19" module frame sy-stem. The height is a uniform243 mm (9.57 inches) for allhousing widths.

Figure 4

Rear view with terminal covers andwiring

E

D

C

B

Figure 3

Rear view with screw terminals (for ringlugs) and communication interfaces


Figure 2

Housing widths 1/2 rack and full rack (19’‘)

The 7SD52 relay employsflexible communicationmodules.For the systemcommunications and modemcommunications a 820 nmoptical module for connec-tion to multimode fiber withST-connectors is available.Also available are electricalRS485 or RS232 interfaces.

The protection interfaceshave the following options:

� 820 nm optical interfacewith clock recovery / ST-connectors for direct con-nections with multimodefiber up to 1.5 km or theconnection to a communi-cation converter.

� 820 nm optical interface /ST-connectors for directconnections up to 3.5 kmwith multimode fiber.

� 1300 nm optical interface /ST-connectors for directconnections up to 10 kmwith single-mode fiber.

� 1300 nm optical interface /FC-connectors for directconnections up to 35 kmwith single-mode fiber.

� The connection to a multi-plexed communication-network is accomplishedby an auxillary communica-tion converter which inter-faces, with the 820 nmand ST-connectors on therelay, and provides anelectrical X21 interface orG703.1 interface.

Figure 5

Optical fiber communication module

Figure 6

RS232/RS485 electrical communication module

SIPROTEC 4 – 7SD522/523Multiterminal Differential Relay for Two-Six Line TerminalsCommunication modules


Figure 7

Direct optical link up to 1.5 km

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Figure 11

Connection to a wired communication device (multiplexer)

Figure 10

Direct optical link up to 35 km

Figure 9

Direct optical link up to 10 km

Figure 8

Direct optical link up to 3.5 km

Relay to Relay Communication – Options


7SD52 7SD52

max. 1.5 km with

62.5/125 �m multimode

fiberST connectorson both sides

7SD52 7SD52

max. 3.5 km with


fiber

ST connectorson both sides

7SD52 7SD52

max. 10 km with

9/125 �m

single-mode fiberST-connectorson both sides

7SD52 7SD52

max. 35 km with

9/125 �m

single-mode fiber

FC-connectorson both sides

7SD52

Communicationconverter

max. 1.5 km with


fiberST connectorson both sides

Interface

� Link to communication device

X21 (64/128/512 kBit)G703 (64 kBit)Interface and baud rateselectable by jumpers

Figure 12 DIGSI 4 – Main menu

Figure 13 DIGRA 4 – Fault event analysis

DIGSI 4

The PC DIGSI 4 operatingprogram is the user interfacefor the 7SD52 units. It is amodern PC operatorinterface that is usable withWindows� versions 95/98/NT4.0. DIGSI 4 is the toolused for configuration, pro-gramming and interface forthe 7SD52 and otherSIPROTEC 4 relays.With the additional programDIGRA 4 comprehensivefault analysis is posible. TheDIGSI Remote program of-fers a remote access via mo-dem to the relay with it´s rearservice/modem interface.

SIPROTEC 4 – 7SD522/523Multiterminal Differential Relay for Two-Six Line TerminalsDIGSI 4 Operating Program


Figure 14 DIGSI 4 – Matrix

DIGSI 4 matrix

The DIGSI 4 matrix providesan overall view of the relayconfiguration at a glance. Forexample, all LEDs and theconfiguration of the controlinputs and contact outputsare displayed in a singlechart. One click of the mouseallows the assignments to bemade.

DIGRA 4

Fault recordings, which arestored in COMTRADE for-mat, are displayed with apowerful PC-tool DIGRA 4(DIGSI-GRAFICS). This pro-gram offers analysis func-tions such as voltage andcurrent phasors, fourier anal-ysis, rms analysis, time tag-ging of control inputs andcontact outputs, elementpick ups and drop outs, com-prehensive measure func-tions and more.

DIGSI 4 Operating Program

Convenient protectionfunctions setting:Secondary or Primary

The settings can be enteredand displayed as secondaryor primary values. Switchingbetween secondary and pri-mary is accomplished by oneclick on the correspondingsymbol in the tool bar insideDIGSI 4.

Commissioning

Special attention has beenpaid to commissioning. Allbinary inputs and output con-tacts can be displayed andactivated directly. This cansimplify the wiring checksignificantly for the user.Furthermore all currents andoptionally voltages and therephasors are available viacommunication link at the lo-cal relay and displayed in therelay, with DIGSI 4 or a spe-cial commissioning programrunning in a standardbrowser (Internet Explorer orNetscape Navigator).

CFC: Programmable logic

editor

With the help of the CFC gra-phic tool (Continuous Functi-on Chart), interlocks andswitching sequences can beconfigured simply via dragand drop of logic symbols.No special knowledge ofsoftware is required. Logicalelements, such as AND, OR,flip-flops and timer elementsare available, for enhancedmonitoring, alarming andcontrol applications. You canalso generate annunciationsand logical combinations ofinternal or external signals.That offers adaptability forcustom requirements.For protection, control andmeasurement different logicplans can be generated.

Browser based Commis-sioning aid

The 7SD52 provides a com-missioning and test programwhich runs on a standardINTERNET browser (no spe-cial software is required atthe PC). This shows the pro-tection topology and compre-hensive measurements fromlocal and remote terminals.Local remote measurementsare shown and the breakerpositions of each line end aredepicted.

Figure 15 RLC logic, example (CFC)

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Figure 16 Browser based Commission aid


SIPROTEC 4 – 7SD522/523Multiterminal Differential Relay for Two-Six Line Terminals

Figure 18

Communication via star coupler

Figure 17

IEC 60870-5-103 star type RS232 copper conductor connection or fiberoptic connection

System SIPROTEC 4/SICAM

Substation control / system

interface

The 7SD52 has a system inter-face which is according to theIEC 60870-5-103 standard. Withthis interface it can be opticallyor electrically connected to asubstation control system likeSINAULT LSA or the SICAMsystem. DNP3.0 andPROFIBUS FMS are inpreparation.

Service / modem interface

With the service / modem inter-face the protection staff has lo-cal or remote access withDIGSI 4 or a standard browserto the 7SD52 relay. Local andremote communication can bebuilt up optically withstarcoupler or electrically withRS485 bus. Thus secure andcost effective solutions are pos-sible which save costs, becausethe work with the relay can bedone from a central location orfrom remote from the office.

DIGSI 4Local operation

Star coupler7XV5

Modem DIGSI 4Remote accessvia modem

RS485converter7XV5650

SIPROTEC 4 relays in the bay


Centralcontrolunit

Application for a three ter-minal line

Figure 18 shows the typicalapplication for a three termi-nal line. On the TAP-line, the7SD52 multiterminal differen-tial relay is connected to cur-rent (CT) and voltage (VT)transformers. For the differ-ential functions only CT´s arenecessary. A connection tothe VT´s improves the fre-quency measurement and of-fers increased information,such as distance to fault.The link to the other relays ismade by single-mode opticalfiber. There are two opticalmodules available. One co-vers distances up to 10 kmand the other up to 35 km.Direct fiber connection offershigh-speed data exchangewith 512 kBit/s and improvesthe speed of the differentialconfiguration.

At the main line two differen-tial relays are connected toCT´s. The communication ismade via a multiplexed com-munications network. 7SD52offers many features to han-dle connections via commu-nication-networks with high security.Depending on the bandwidthavailable in the communica-tion system 64 kBit, 128 kBitor 512 kBit can be selectedfor the X21 interface, wherethe G703.1 interface workswith 64 kBit/s. The connec-tion to the communicationdevice is done via cost effec-tive 820 nm interface withmultimode fiber. A communi-cation converter converts theoptical to electrical signals.This offers an interfer-ence-free and isolated con-nection between the relayand the communication de-vice.

Typical fields application

Figure 19

Application for a three terminal line (Ring topology)

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Multi-

plexer

Multi-

plexer

Single mode fiber optic connection, max. 35 km, 1300 nm

Differential relay7SD523

Distance relay7SA52

Sin

gle

mod

efib

erop

ticco

nnec

tion,

max

.10

km,1

300

nm

820 nmmax.1.5 km


X21G703 Digital SDH-

communicationnetwork

X21G703


Currenttransformer


Main line

TAP-line


Differential protection(87L, 87T)

The differential protectionfunction has the followingfeatures:� Measurements are per-

formed separately for eachphase; thus the trip sensiti-vity is independent of thefault type.

� An adaptive, sensitive mea-surement method with highsensitivity for differentialfault currents below ratedcurrent offers the detectionof highly resistive faults.This trip element uses spe-cial filters, which offers highsecurity even with highlevel DC-components in theshort circuit current.

� An high-set differential tripstage which clears differen-tial fault currents higherthan nominal current within15 ms offers fast trippingtime and high-speed faultclearence time.

� When a long line or cable isswitched on transientcharge currents load theline. To avoid a higher set-ting of the sensitive differ-ential trip stage, thissetpoint may be increasedfor a settable time. This of-fers greater sensitivityunder normal load condi-tions.

� With the setting of the localCT-errors the relay automat-ically calculates the re-straint/stabilization currentand adapts its permissiblesensitivity according theCT´s data in the differentialconfiguration, optimizingsensitivity.

� Different CT ratios at theterminals are handled insidethe relay. The mismatch of1 to 6 is allowed.

� The differential trip can becombined with anovercurrent release. Thusdifferential current andovercurrent lead to a finaltrip decision.

� Easy to set tripping charac-teristic. Because the relayworks adaptive only thesetpoint IDiff> and IDiff>>must be set according thecharge current of theline/cable.

� Differential and restraintcurrent are monitoredcontinously during normaloperation and are displayedas operational measure-ments.

� High stability during exter-nal faults even with diffe-rent current transformerssaturation level. For an ex-ternal fault only 5ms satura-tion free time are necessaryto guarantee the security ofthe differential configura-tion.

� With transformers or com-pensation coils in theprotection zone, the sensi-tive trip stage can beblocked by an inrush detec-tion function. It works withthe second harmonic in themeasured current com-pared with the fundamentalcomponent.

� With transformers in theprotection zone, vectorgroup matching andCT-ratio matching is done inthe relay. Additionally, thezero sequence current flow-ing through a groundedneutral is eliminated fromthe differential measure-ment. The 7SD52 thereforeworks like a transformer dif-ferential relay, where as theterminals may be far away,decreasing infrastructure(CT´s, breakers, relays)requirements.

Functions

Tripping characteristic

DifferentialcurrentI

I

Diff

N, Op

I

I

Rest

N, Op

Trippingarea

Restraintarea

Adaptive restraint/stabilization

0.6

0.4

IDiff>

0.2 0.4 0.6

Enhanced communicationfeatures for communicationnetworksThe data required for the dif-ferential calculations are cy-clically exchanged infull-duplex mode in form ofsynchrounous, serial tele-grams between the protecti-on units. The telegrams aresecured with CRC-checksums, though telegram er-rors in a communication net-work are recognized.� Data communication is in-

sensitive to electromag-netic interference becauseof fiber optic cable use.

� Supervision of each re-ceived telegram and of theentire communication pathbetween the units withoutadditional equipment.

� Clear identification of eachdifferential relay by a com-munication address in thedifferential topology. Thisallows detection of changesin the communication pathin the communication net-work to avoid misoperation.

� Recognition of reflectedtelegrams in the communi-cation system.

� Detection of timingchanges in communicationnetworks.

� Measurement of the delaytime to the remote lineends with dynamic com-pensation of the delay inthe differential measure-ment. Supervision of themaximum permissible delaytime is included.

� Alarms for heavily disturbedcommunication links. Faultytelegram counters are avail-able as operational mea-surement.

Circuit-breaker intertrippingand remote trip/signalsNormally the differential faultcurrent is calculated for eachterminal nearly at the sametime. This leads to fast andequal tripping times. Underweak infeed conditions, es-pecially when the differentialfunction is combined with anovercurrent release a phaseselecting intertrip offers atripping of all line terminals.� 7SD52 has 4 intertrip sig-

nals which are transmittedin high-speed (� 20 ms) tothe other terminals. Thisintertrip signals can also beinitiated by an external relayvia binary inputs and there-fore be used to indicate, forexample, a directional deci-sion of the back-up distancerelay.

� In addition, 4 high-speed re-mote trip signals are avail-able, which may be initiatedby an external or internalevent.

� 24 remote signals can befreely assigned to inputsand outputs at each termi-nal and are circulatingbetween the different de-vices.



Functions

Figure 20

Ring or Chain topology

Terminal 2 / 7SD523 Terminal 2

Ring topology Chain topology

Termi-nal 3

Termi-nal 3

Terminal 1 / 7SD523 Terminal 1 / 7SD523

Connection to

other devices

Intermediate summation

I1

I2

I3

I2

I3

I3+I1

I1+I2

I1+I2

I3+I1

Communication topologies /modes of operationThe differential relays maywork in a ring or daisy chainline topology (see figure 20).Use of a test mode offer ad-vantages under commission-ing and service conditions.� In a ring topology a loss of

one data connection is toler-ated by the system. The to-pology is rerouted in a chainwith shorter than 100 msand the differential functionremains afterwards into op-eration withoutmisoperation.

� To reduce communicationlinks and to save money forcommunications, a chain to-pology may be applied. Atthe line terminals only costeffective 7SD522 relays arenecessary for this applica-tion.

� A highly reliable dual com-munication path applicationis a two terminal configura-tion where the main commu-nication path is switchedover to a standby connectionif the main communicationlink fails. This hot-standbyoperation offers high avail-ability for important lines dueto communication failures.

� In a ring topology one lineend can be logged out fromthe differential topology forservice or maintenance rea-sons by a signal into acontrol input. Checks for thebreaker position and loadcurrent are made before thislogout is initiated. In a chaintopology, the relays at theend of the line can be loggedout from the differential to-pology.

� For test purposes the wholeconfiguration can be broughtinto a test mode. All func-tions and indications areavailable except the breakersare not tripped.The local relay can be testedand no trip or intertrip reac-tion is done by the other re-lays.

7SD523

7SD5227SD522

SIPROTEC 4 – 7SD522/523Multiterminal Differential Relay for Two-Six Line TerminalsFunctions

Figure 21

Normal inverse � �t T�

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0.14

1P

PI I/

.0 02

Thermal overloadprotection(ANSI 49)

A built-in overload protectionwith an alarm stage is pro-vided for the thermal protec-tion of cables.The trip time characteristicsare exponential functions ac-cording to IEC 60255-8 andconsider the current-initiatedheat gains from the opera-tional currents as well as thesimultaneous cooling effect.The preload is thus consid-ered in the trip times foroverloads.An adjustable alarm stagecan initiate an alarm beforetripping is initiated.

Backup overcurrentprotection(ANSI 50, 50N, 51, 51N)

The 7SD522/523 provides abackup overcurrent protec-tion. Two definite timestages and one inverse timestage (IDMT) are available,separately for phase currentsand for the neutral (residual)current. Two operatingmodes are selectable. Thefunction can run in parallel tothe differential protection oronly for back-up during inter-ruption of the protectioncommunication.The available ANSI/IEEE in-verse-time curves are:� Inverse� Short inverse� Long inverse� Moderately inverse� Very inverse� Extremely inverse� Definite inverse

STUB bus overcurrentprotection(ANSI 50(N)-STUB)

The STUB bus overcurrentprotection is a separate defi-nite time overcurrent stage.It can be activated from acontrol input signalling theopen disconnect switch.Settings are available forphase and ground (earth)faults.

Instantaneous high-speedswitch-onto-faultovercurrent protection

(ANSI 50HS)

Instantaneous tripping is pos-sible when energizing afaulty line. On definitelarge-fault currents, thehigh-speed switch-onto-faultovercurrent stage can initiatevery fast 3-pole tripping.With lower fault currents, in-stantaneous tripping afterswitch-onto-fault is also pos-sible if the breaker positionsat the line terminals are mon-itored and connected to therelays. This breaker positionmonitor offers a high-speedtrip during switch-onto-faultconditions.The switch-onto-faultinitiation can be detected viathe binary input ”manualclose” or automatically viameasurement.

Automatic reclosing(ANSI 79)

The 7SD522/523 relay isequipped with an automaticreclosing function (AR). Thefunction includes several op-erating modes:� 3-pole auto reclosing for all

types of faults; differentdead times are availabledepending on the type offault.

� 1-pole auto reclosing for.1-phase faults, no reclosingfor multi-phase faults.

� 1-pole auto reclosing for1-phase faults and for2-phase faults withoutearth, no reclosing formulti-phase faults.

� 1-pole auto reclosing for1-phase and 3-pole autoreclosing for multi-phasefaults.

� 1-pole auto-reclosing for1-phase faults and 2-phasefaults without earth and3-pole auto reclosing forother faults.

� Multiple-shot autoreclosing.

� Interaction with an externaldevice for automaticreclosing via control inputsand contact outputs.

� Control of the integrated ARfunction by external protec-tion.

� Adaptive auto-reclosure.Only one terminal is closedafter the dead time. If thefault persists this terminal isswitched off finally.Otherwise the other termi-nals are closed via the com-munication links. Thisavoids stress due to heavyfault currents fed from allterminals again.

� Supervision by an externalsynchronism check.

� Monitoring of thecircuit-breaker auxiliarycontacts.

� Voltage check for discrimi-nation between successfuland non-successful recloseattempts.

In addition to the above men-tioned operating modes, se-veral other operating modescan be performed by meansof the integrated pro-grammable logic (CFC).

Current transformer/Fuse

failure monitoring

The 7SD522/523 relayprovides comprehensivemonitoring functions cover-ing both hardware and soft-ware. Furthermore, the mea-sured values are continu-ously checked for plausibility.Thus the current and voltagetransformers are also in-cluded in this monitoring sys-tem.



Functions

A broken wire between theCTs and relay inputs underload may lead tomisoperation of a differentialrelay if the load current ex-ceeds the differentialsetpoint. The 7SD52 pro-vides fast broken wire super-vision which immediatellyblocks all line terminals if abroken wire condition is mea-sured by a local relay. Thisavoids misoperation due tobroken wire condition. Onlythe phase where the brokenwire is detected is blocked.The other phases remain un-der differential operation.Additional measurement su-pervision functions are� Symmetry balance of volta-

ges and currents� Summation of phase/neu-

tral currents and voltages� Phase-sequence super-

vision

Trip circuit supervision(ANSI 74TC)

One or two binary inputs foreach circuit breaker pole canbe used for monitoring thecircuit-breaker trip coils inclu-ding the connecting cables.An alarm signal is issuedwhenever the circuit iscompromized rupted.

Lockout (ANSI 86)

A trip command may initiatea lockout until it is reset via acontrol input. Therefore thelockout state can beremoved by manual reset-ting. A prerequisite is thatthe close coil as usual at thecircuit breaker is locked withpending tripping command.

Local measured values

The measured values are cal-culated from the sampledcurrent and voltage signalsalong with the power factor,the frequency, the real andreactive power. Measuredvalues are displayed as pri-mary or secondary values orin percent of the specific linenominal current and voltage.The relay uses a 20 Bit highresolution AD-converter andthe analog inputs are factorycalibrated so a high accuracyis reached.The following values are

available for measured valueprocessing:� Currents 3 x Iphase, 3 I0 , IE

� Voltages 3 x Vphase-ground, 3 xVphase-phase, 3V0, Ven

� Symmetrical componentsI1, I2, V1, V22

� Real power P (Watt),Reactive power Q (Var),Apparent power S (VA)

� Power factor PF (= cos�)� Frequency f� Differential and restraint

current per phaseLimit-value monitoringLimit values are monitoredby means of the CFC. Com-mands can be derived fromthese limit value indications.

Measured values at remote

line ends

Every two seconds the cur-rents and voltages arefreezed at the same time andtransmitted via the communi-cation link. At a local terminaltherefore currents and volt-ages are available with theirmagnitude and phasor (an-gle). This allows checking thewhole configuration underload conditions. In addition,the differential and restraintcurrents are also displayed.Important communicationmeasurements, such as de-lay time or faulty telegramsper minute/hour are alsoavailable as measurements.

Commissioning and test

functions

Special attention has beenpaid to commissioning. Allcontrol inputs and contactoutputs can be displayed andset directly. This can simplifythe wiring check process sig-nificantly.The measured values can bedisplayed via DIGSI 4 on thePC screen as primary, sec-ondary and/or percentagevalues simultaneously. Thisprovides a complete over-view of the actual systemconditions.

� The 7SD522/523 provides acircuit breaker test function.Single- and three pole tripp-ing commands can begene- rated manually fol-lowed by a reclosing com-mand. The pole open timecan be set separately to theauto reclosing dead time.

� Special modes of operationprovide easy testing andcommissioning help underservice conditions.

4 predefined settinggroups

The settings of the7SD522/523 relay can beadapted quickly to suitchanging networkconfigurations. 4 settinggroups can be predefinedduring commissioning orchanged by remote via aDIGSI 4 modem link. Thesetting groups can beactivated via control inputs,via DIGSI 4 (local or remote),via the integrated keypad orvia the substation controlinterface.

Function Region World Region US Region GE

Frequency50 Hz/60 Hz

preset to 50 Hz preset to60 Hz

preset to50 Hz

Inverse-timecharacteristic forbackup overcurrent

IEC, ANSI1)

preset to IEC

ANSI1) IEC

Inverse-timecharacteristic forground (earth)overcurrent

IEC, ANSI1) ,Logarithmic inversepreset to IEC

ANSI1) IEC

STUB-Busovercurrentstage

� � –

1) Disc-emulation with inverse time characteristicmay be applied with ANSI curves

Operational measured values are clearly arrangedon the LCD display

Some fault indications are displayed automticallyon the LCD display

Indication filtering anddelay

Indications can be filtered ordelayed. Filtering serves tosuppress brief changes atthe indication input. The indi-cation is passed on only ifthe indication voltage is stillpresent after a set period oftime. In the case of indicationdelay, there is a delay for apreset time. The informationis passed on only if the indi-cation voltage is still presentafter this time.

Indication derivation

A further indication (or acommand) can be derivedfrom an existing indication.Group indications can also beformed. The volume of infor-mation to the system inter-face can thus be reduced andrestricted to the most impor-tant signals.

Data transmission lockout

A data transmission lockoutcan be activated, so as toprevent transfer of informa-tion to the control centerduring work on a circuit bay.

Test mode

During commissioning a testmode can be selected; allindications then have a testmode suffix for transmissionto the control system.

Control

In addition to the protectionfunctions, the SIPROTEC 4units also support all controland monitoring functions re-quired for operating medium-voltage or high-voltage sub-stations. The main applica-tion is reliable control ofswitching and other proces-ses. The status of primaryequipment or auxiliary de-vices can be obtained fromauxiliary contacts and com-municated to the7SD522/523 via control in-puts. Therefore it is possibleto detect and indicate boththe OPEN and CLOSED posi-tion or a faulty or intermedi-ate circuit-breaker or auxiliarycontact position. The switch-gear or circuit-breaker can becontrolled via:� integrated operator panel� control inputs� substation control system� DIGSI 4.

Automation

With the integrated logic,specific functions for theautomation of the switchgearor substation by means of agraphic interface (CFC) canbe set. Functions are acti-vated by means of functionkeys, control inputs or via thecommunication interface.

Switching authority

The following hierarchy ofswitching authority is appli-cable: ”LOCAL”, DIGSI 4 PCprogram, ”REMOTE”. Theswitching authority is deter-mined according to parame-ters or by DIGSI 4. If the”LOCAL” mode is selected,only local switching opera-tions are possible. Everyswitching operation andchange of breaker position isstored in the event log. Theswitch command source,switching device, cause (i.e.spontane- ous change orcommand) and result of aswitching operation isrecorded.

Command processing

The 7SD522/523 offers allfunctions required forcommand processing, in-cluding the processing of

single and double commandswith or without feedback aswell as sophisticatedmonitoring of the controlhardware and software.Control actions usingfunctions such as runtimemonitoring and automaticcommand termination afteroutput check of the externalprocess are also provided by7SD522/523. Typicalapplications are:� Single and double com-

mands using 1, 1 plus 1common or 2 trip contacts

� User-definable breaker/dis-connect/groundary switchinterlocks

� Operating sequences com-bining several switchingoperations such as controlof circuit-breakers, isolators(disconnector switches) andearthing switches.

� Derived triggering of switch-ing operations, indicationsor alarms by logical combi-nation of existing informa-tion.

Assignment of commandfeedback

The positions of the circuit-breaker or switching devicesare captured by feedback.These indication inputs arelogically assigned to the cor-responding command out-puts. The unit can thereforedistinguish whether the in-dication changes as a conse-quence of switching opera-tion or due to a spontaneouschange of state (intermediateposition) which may indicatefaultly auxiliary switches orcompromized control wiring.

Chatter disable

The chatter disable featureevaluates whether the num-ber of status changes of anindication input exceeds aspecified figure in a configu-red period of time. If so, theindication input is blocked fora certain period, so that theevent list will not record ex-cessive operations.

Filter time

All binary control indicationscan be subjected to a filtertime (indication delay) to pre-vent spurious operation.

Figure 22

SIPROTEC 4 – 7SD522/523Multiterminal Differential Relay for Two-Six Line TerminalsControl and automatic functions


Q1

Q3

Q5

Q7

Q2

Q4

Q6

Q8

R15

R16

R17

R18

I4

Flush mount ing

52 Circuit-

breaker

VN

Line

A (L1)

B (L2)

C (L3)

Busbar

IN

IA(L1)

IB(L2)

IC(L3)

VA(L1)

VB(L2)

VC(L3)

optional voltage inputs

Typical connection ofcurrent and voltagetransformers

The typical AC connection has3 phase current transformersand 3 phase-ground (earth)voltage transformers. Theneutral (residual) current (IN =3I0) is measured via the I4-current transformer as thesum of the three phase cur-rents.The zero sequence voltage3V0 is not measured exter-nally but calculated by themicroprocessor.Voltage inputs are alwaysavailable in the relay. Butthere is no need to connectthem to voltage transformers.

Typical connection

Figure 23

Typical connection


Analog input circuits Rated frequency 50 Hz or 60 Hz (selectable)Rated current IN 1 A or 5 A (selectable, controlled by firmware)Rated voltage 80 V to 125 V (selectable)Power consumption

in CT circuits with IN = 1 A approx. 0.05 VAin CT circuits with IN = 5 A approx. 0.30 VAin VT circuits approx. 0.1 VA

Thermal overload capabilityin CT circuits 100 x IN for 1 s

30 x IN for 10 s4 x IN continuous

in VT circuits 230 V continuous per phaseDynamic overload capability

in CT circuits 250 x IN (one half cycle)in the CT circuit for high sensitive earth faultprotection (refer to ordering code)

Power Supply Rated auxiliary voltage 24 V to 48 V DC60 V to 125 V DC110 V to 250 V DCand 115 V AC with 50 Hz / 60 Hz

Permitted tolerance of the rated auxiliary voltage -20% to +20%Max. superimposed AC voltage (peak to peak) � 15%Power consumption

during normal operation approx. 8 Wduring pickup with all inputs and outputs activated approx. 18 W

Bridging time during auxiliary voltage failureVaux � 110 V � 50 ms

Binary Inputs Quantity 8 or 16 or 24Function can be assigned

Minimum operating voltage 17 V or 73 V or 154 V DC, bipolarRange is selectable with jumpers for each (3 operating ranges)binary input

Maximum operating voltage 300 V DCCurrent consumption, energized approx. 1.8 mA

Output contacts Quantity 16 or 24 or 32Function can be assigned

Switching capacitymake 1000 W / VAbreak 30 VAbreak (for resistive load) 40 Wbreak (for � = L/R � 50 ms) 25 VA

Switching voltage 250 VPermissible current 30 A for 0.5 s

5 A continuous

LED displays QuantityRUN (green) 1ERROR (red) 1Indication (red), function can be assigned 14

Hardware

SIPROTEC 4 – 7SD522/523Multiterminal Differential Relay for Two-Six Line TerminalsTechnical Data


Mechanical construction Housing 7XP20 see dimension drawings1/2 x 19’‘ or 1/1 x 19’‘Degree of protection to EN 60 529

For the front of the housing IP 51For the rear of the housing

flush mounting version IP 50surface mounting version IP 51

For the terminals IP 2x with terminal cover put onWeight

Flush mounting1/2 x 19‘’ 6 kg1/1 x 19’‘ 10 kg

Surface mounting1/2 x 19‘’ 11 kg1/1 x 19’‘ 19 kg

Serial interfaces / front of unit

Operating interface 1 Connection front panel, non isolated, RS 232,for DIGSI 4 or browser 9-pin subminiature connector

Baud rate 4800 Baud to 115200 Baud

Serial interfaces / rear of unit

Time synchronization Connection 9-pin subminiature connectorwith IRIG-B signal / DCF77 /SCADA or binary input impulse Voltage levels 5 V or 12 V or 24 V

Service interface Isolated RS232/RS485 9-pin subminiature connector(Operating interface 2) Dielectric test 500 V/ 50 Hzfor DIGSI 4 / Modem / Service Distance for RS232 max. 15 m

Distance for RS485, depends on the baud rate max. 1000 mFiber-optic integrated ST-connector

Optical wavelength � 820 nmPermissible attenuation max. 8dB for glass-fiber 62.5/125�mDistance max. 1.5 km

System interface Isolated RS232/RS485 9-pin subminiature connectorIEC60870-5-103 Baud rate 4800 Baud to 38400 BaudPROFIBUS FMS (*) Dielectric test 500 V / 50 HzPPROFIBUS DP (*) Distance for RS232 max. 15 mDNP 3.0 (*) Distance for RS485 max. 1000 m

Fiber-optic integrated ST-connectorOptical wavelength � = 820 nmPermissible attenuation max. 8dB for glass-fiber 62.5/125mDistance max. 1.5 km

*) available with next firmware release**) in preparation


Protection interface 1/2 fiber optic 820 nm with 62.5 125 �m multimode fiber cable,with clock recovery ST-connectorsDirect connection up to 1.5 km or for connectionto the communications converterfiber optic 820 nm with 62.5 125 �m multimode fiber.Direct connection up to 3.5 km ST-connectorsfiber optic 1300 nm with 9/125 �m single-mode fiber.Direct connection up to 10 km ST-connectorsfiber optic 1300 nm with 9/125 �m single-mode fiberDirect connection up to 35 km FC-connectors

External Communication External communication converterConverter to interface between the relays

optical 820 nm interface andthe X21/G703.1 interfaceof a communication device.X21 or G703 selectable by jumpers.Baudrate selectable by jumpers.Fiber optic 820 nm max. 1.5 km with 62.5/125 �m multimodewith clock recovery fiber optic cable to device sideX21 electrical interface on 64/128/512 kBit (selectable by jumper)communication device max. 800 m, 15-pin connectorG703.1 electrical interface oncommunication device 64 kBit/s, max. 800 m, screw terminal

Permissible delay time Delay of telegrams caused by transmission max. 30 ms per transmission distance.in the communication system to the other device. Continuous measurement Permissible max. value can be selected

and adaptive correction

Serial interfaces / protection interface

SIPROTEC 4 – 7SD522/523Multiterminal Differential Relay for Two-Six Line TerminalsTechnical Data



Regulations Standards IEC 60255 (product standards)ANSI/IEEE C37.90.0/.1/.2UL 508For further regulations see “Individual functions”

Insulating tests Standards IEC 60255-5Voltage test (100% test)

All circuits except for auxiliary supply, binary inputs 2,5 kV (rms.), 50 Hz / 60 Hzand communication interfacesAuxiliary voltage and binary inputs (100% test) 3,5 kV DCRS485/RS232 rear side communication interfacesand time synchronization interface 500 V (rms.), 50 Hz / 60 Hz

Surge voltage test (type test)All circuits except for communication interfaces 5 kV (peak); 1.2/50 s; 0.5 Jand time synchronization interface, class III 3 positive and 3 negative surges at intervals of 5 s

EMC tests for noise immunity Standards IEC 60255-6, 60255-22 (Product standards)(Type tests) EN 50082-2 (Basic specification)

DIN 57 435 part 303High frequency test 2.5 kV (peak); 1 MHz; = 15 ms; 400 surges per s;

IEC 60255-22-1, class III and DIN 57 435 test duration 2 spart 303, class III

Discharge of static electricity 8 kV contact discharge; 15 kV air discharge; bothIEC 60255-22-2 class IV polarities; 150 pF; Rj = 330 �EN 61000-4-2, class IV

Exposure to RF field, non modulated 10 V/m; 27 MHz to 500 MHzIEC 60255-22-3 (report) class III

Exposure to RF field, amplitude-modulated 10 V/m; 80 MHz to 1000 MHz; 80% AM; 1 kHzIEC 61000-4-3, class III

Exposure to RF field, pulse-modulated 10 V/m; 900 MHz; repetition frequency 200 Hz;IEC 61000-4-3/ ENV 50204, class III duty cycle 50 %

Fast transients, Bursts 4 kV; 5/50 ns; 5 kHz; burst length = 15 ms;IEC 60255-22-4 and repetition frequency 300 ms; both polarities;IEC 61000-4-4, class IV Rj = 50 �; test duration 1 min

High-energy surge voltages (SURGE),IEC 61000-4-5 installation class IIIAuxiliary supply common mode: 2kV; 12 �, 9 �F

differential mode: 1kV; 2 �, 18 �FMeasurements inputs, binary inputs, binary outputs common mode: 2kV; 42 �, 0.5 �F

differential mode: 1kV; 42 �� 0.5 �FConducted RF, amplitude-modulated 10 V; 150 kHz to 80 MHz; 80 % AM; 1kHz

IEC 61000-4-6, class IIIMagnetic field with power frequency 30 A/m continuous; 300 A/m for 3 s; 50 Hz

IEC 61000-4-8, class IV; IEC 60255-6 0.5 mT; 50 HzOscillatory Surge Withstand Capability 2,5 to 3 kV (peak); 1 to 1,5 MHz

ANSI/IEEE C37.90.1 damped wave; 50 surges per second;Duration 2 s; Rj = 150 � to 200 �

Fast Transient Surge Withstand Capability 4 kV to 5 kV; 10/150 ns; 50 impulses per second;ANSI/IEEE C37.90.1 both polarities; duration 2 s ; Rj = 80 �

Radiated Electromagnetic Interference 35 V/m; 25 MHz to 1000 MHzIEEE C37.90.2

Damped oscillations 2.5 kV (peak value), polarity alternating 100 kHz,IEC 60894, IEC 61000-4-12 1 MHz, 10 MHz and 50 MHz, Rj = 200 �

EMC tests for interference Standard EN 50081-1 (Basic specification)emission Radio interference voltage on lines, only auxiliary supply 150 kHz to 30 MHz(Type test) IEC-CISPR 22 class B

Interference field strength 30 MHz to 1000 MHzIEC-CISPR 22 class B

Electrical tests


Vibration, shock stress and vibrationduring earthquake Standards IEC 60255-21 and IEC 60068-2

Vibration sinusoidalIEC 60255-21-1, class 2 10 Hz to 60 Hz: ±0.075 mm amplitude;IEC 60068-2-6 60 Hz to 150 Hz: 1 g acceleration

frequency sweep 1 octave/min20 cycles in 3 othogonal axes

Shock half-sinusoidalIEC 60255-21-2, class 1 acceleration 5 g, duration 11 ms, 3 shocks each inIEC 60068-2-27 both directions of the 3 axes

Vibration during earthquake sinusoidalIEC 60255-21-2, class 1 1 Hz to 8 Hz: ±3,5 mm amplitude (horizontal axis)IEC 60068-3-3 1 Hz to 8 Hz: ±1.5 mm amplitude (vertical axis)

8 Hz to 35 Hz: 1g acceleration (horizontal axis)8 Hz to 35 Hz: 0.5 g acceleration (vertical axis)frequency sweep 1 octave/min1 cycle in 3 orthogonal axes

during transport Standards IEC 60255-21 and IEC 60068-2Vibration sinusoidal

IEC 60255-21-1, class 2 5 Hz to 8 Hz: ±7.5 mm amplitude;IEC 60255-2-6 8 Hz to 150 Hz: 2 g acceleration

frequency sweep 1 octave/min20 cycles in 3 orthogonal axes

Shock half-sinusoidalIEC 60255-21-2, class 1 acceleration 15 g, duration 11 ms, 3 shocks eachIEC 60068-2-27 in both directions of the 3 axes

Repetitive shock half-sinusoidalIEC 60255-21-2, class 1 acceleration 10 g, duration 16 ms, 1000 shocksIEC 60068-2-29 each in both directions of the 3 axes

Climatic stress tests

Temperatures Standards IEC 60255-6Temperature during service -5 °C to +55 °CLimit temperature during service -20 °C to +70 °C

(The legibility of the display may be affectedabove 55°C)

Temperature limit during storage -25 °C to +55 °CTemperature limit during transport -25 °C to +70 °C(Storage and transport with standard factory packaging)

Humidity Permissible humidity stress yearly average � 75% relative humidity; on 56 daysin the year up to 93% relative humidity; moisturecondensation during operation is not permitted

CE conformity This product is in conformity with the directive of the The device is designated and manufactured for useCouncil of the European Communities on the in industrial environment acc. to EMC standard.approximation of the laws of the member states Conformity is proved by tests that had beenrelating to electromagnetic compatibility performed according to Article 10 of the(EMC Council Directive 89/336/EEC) and concerning Council Directive in accordance with theelectrical equipment for application within specified generic standards EN 50081 and EN 50082voltage limits (low-voltage directive 73/23 EEC). (for EMC directive) and the standards EN 60255-6

(for low-voltage directive) by Siemens AG.The device is designed in accordance with theinternational standards of IEC 60255.

Further applicable standards:ANSI/IEEE C37.90.0 and C37.90.1

Technical Data



Differential protectionANSI 87L, 87T

Sensitive normal trip stage Setting rangeIDiff> IDiff secondary 1 A 0.1 to 20 A (step 0.1)

secondary 5 A 0.5 to 100 ATripping time typ. 35 ms for two terminalsIDiff > 4 × IDiff> (setting value) typ. 37 ms for three terminals with fiber optic

Sensitive normal trip stage Setting rangewith switch on IDiff secondary 1 A 0.1 to 20 A (step 0.1)IDiff>, switch on secondary 5 A 0.5 to 100 A

Tripping time typ. 35 ms for two terminalsIDiff > 4 × IDiff> (setting value) typ. 37 ms for three terminals with fiber optic

Delay time of 0.0 to 60.0 sIDiff> trip stage

High set fast trip stage Setting rangeIDiff>> IDiff secondary 1 A 0.5 to 100 A (step 0.1)

secondary 5 A 2.5 to 500 ATripping time typ. 17 ms for two terminalsIDiff > 4 × IDiff>> (setting value) typ. 20 ms for three terminals with fiber optic

Overload protection Setting rangesFactor k acc. to IEC 60255.8 1 to 4 (steps 0.01)Time constant � 1 to 999.9 min (steps 0.1 min)

Temperature alarm stage �alarm/�trip, 50 to 100 % in relation to the trip temperatureCurrent alarm stage Ialarm

secondary 1 A 0.1 to 4 (step 0.01)secondary 5 A 0.5 to 20 (step 0.01)

Trip time characteristic� �

tI I

I k I

pre

N

��

� � ln

2 2

2 2

Reset ratios �/�alarm approx. 0.99�/�trip approx. 0.99I/Ialarm

Tolerances Class 10 % acc. to IEC

Inrush restraint Restraint ratio2nd harmonic I2fN/IfN 10 % to 45 % (step 1 %)

Max. current for restraint 1.1 A to 25 A (step 0.1 A 1)Crossblock function zu- und abschaltbarMax. operative time for crossblock 0 to 60 s (step 0.01 s)

Toper crossblk or (operating up to release)1) Secondary data for IN = 1 A; with IN = 5 A the values must be multiplied by 5.

Vector group adaptation with Adaptation of connection symbol 0 to 11 (× 30 °) (step 1)transformers in the Neutral point connection grounded or not grounded (for each winding)differential zone

Functions


Backup overcurrent protection Operating modes active only with loss of data connectionANSI 50(N), 51(N) always active

Characteristic 2 definite time stages / 1 inverse time stage

Definite time overcurrent Pickup definite time stage 1, 0.1 A to 25 A (1A) / 0.5 A to 125 A (5A)protection phase current (step 0.01 A) or deactivatedANSI 50, 50N Pickup definite time stage 1, 0.5 A to 25 A (1A) / 0.25 A to 125 A (5A)

neutral (residual) current (step 0.01 A) or deactivatedPickup definite time stage 2, 0.1 A to 25 A (1A) / 0.5 A to 125 A (5A)phase current (step 0.01 A) or deactivatedPickup definite time stage 2, 0.05 A to 25 A (1A) / 0.25 A to 125 A (5A)neutral (residual) current (step 0.01 A) or deactivatedTime delay for definite time stages 0 to 30 s, (step 0.01 s) or deactivatedTolerances

Current starting � 3% of set value or 1% of IN

Delay times � 1% of set value or 10 msOperating time approx. 25 ms

Inverse time overcurrent Phase current starting 0.1 A to 4 A (1A) / 0.5 A to 20 A (5A)protection (step 0.01 A) or deactivatedANSI 51, 51N Neutral (residual) current starting 0.05 A to 4 A (1A) / 0.5 A to 20 A (5A)

(step 0.01 A) or deactivated

Tripping time characteristics Characteristics normal inverseaccording to IEC 60255-3 very inverse

extremely inverselong time inverse

Time multiplier Tp = 0.05 to 3 s (step 0.01 s) or deactivatedPickup threshold approx. 1.1 x I/IpReset threshold approx. 1.05 x I/IpTolerances

Operating time for 2 � I/Ip � 5 % of setpoint � 15 ms

Characteristics inverseaccording to ANSI/IEEE short inverse

long inversemoderately inversevery inverseextremely inversedefinite inverse

Time dial 0.5 to 15 (step 0.01) or deactivatedPickup threshold approx. 1.1 x MReset threshold approx. 1.05 x MTolerances

Operating time for 2 � M � 20 � 5% of setpoint � 15 ms

Technical Data

Functions (continued)



Instantaneous high speed switch- Operating mode active only after CB closing; instantaneousonto-fault overcurrent protection trip after pickupANSI 50HS Characteristic 2 definite time stages

Pickup current I>>> 0.1 A to 15 A (1A) / 0.5 A to 75 A (5A)(step 0.01 A) or deactivated

Pickup current I>>>> 1 A to 25 A (1A)/ 5 A to 125 A (5A)(step 0.01 A) or deactivated

Reset ratio approx. 0.95Tolerances < 3 % of set value or 1 % of IN

Automatic reclosure Number of automatic reclosures up to 8ANSI 79 Program only 1-pole

only 3-pole1 or 3-poleadaptive

Voltage check discrimination between successful andnon-successful reclose attempts

Action times 0.01 to 300 s (step 0.01 s) or deactivatedDead times 0.01 to 1800 s (step 0.01 s) or deactivatedReclaim times 0.5 to 300 s (step 0.01 s)CLOSE command duration 0.01 to 30 s (step 0.01 s)Timer tolerance ± 1% of setting value or 10 ms

Operational measured values Currents primary, secondary and percent3 x Iphase3 I0, I1, I2, 3I0

Tolerances10 to 50 % IN typically � 1% of 50 % IN50 to 200 % IN typically � 1% of measured value

Voltages primary, secondary and percent3 x Vphase-ground,3 x Vphase-phase3V0, V1, V2, Ven

Tolerances10 to 50% VN typically � 1% of 50 % VN50 to 200% VN typically � 1% of measured value

Power and direction of power flow primary and percentP, real power in WQ, reactive power in VarS, apparent power in VA

Frequency fPower factor PF (cos �)

TolerancesP: for �cos �� = 0.7 to 1 and typically � 3 %V/VN, I/IN = 50 to 120 %Q: for �sin �| = 0.7 to 1 and typically � 3 %V/VN, I/IN = 50 to 120 %S: for V/VN, I/IN = 50 to 120 % typically � 2 %PF: for �cos �� = 0.7 to 1 � 3 %

Oscillographic fault recording Measured analog channels 3 x Iphase-ground, 3 x I0, IE, 3 x IDiff3 x IStab , 3 x Vphase-ground , 3 V0

Binary channels pickup and trip information, other signals can befreely configured

Maximum number of available recordings 8Sampling interval 20 samples per cycleStorage time total of 5 s

pre-event and post-event recording time andevent storage time settable

Additional functions Measurement supervision current balancevoltage balancecurrent summationbroken wire supervision

Annunciations buffer length 200Event logging storage of signals of the last 8 faultsFault logging buffer length 200Switching statistics phase segregated summation of circuit

breaker operationssummated tripping current per phasetripping current of the last trip

Circuit breaker test trip-/close-cycle 3phasetrip-/close-cycle per phase

Setting range 0 to 30 s (step 0.01)Dead time for CB trip-close-cycle 0 to 30 s (step 0.01)Commissioning aids operational measured values

circuit breaker testread binary inputsinitiate binary inputsset binary outputsset serial interface outputsLogout of a deviceTest mode of the differential protection topology

Technical Data



Selection and ordering data

––25D

Position 5 6 7 8 9 10 11 12 13 14 15 16

S7

� � � ��

Function package/Design5

Multiterminal differential relay with 4-line display 2

Device type 6

Multiterminal differential relay for two terminals operation 2

Multiterminal differential relay for multiterminals (3 to 6) 3

Measurement input7

Iph = 1 A, Ie = 1 A 1

Iph = 5 A, Ie = 5 A 5

Auxiliary Voltage (Power supply, Binary indication voltage)8

24 V to 48 V DC, binary input threshold 17 V ** 2

60 V to 125 V *, binary input threshold 17 V ** 4

110 V to 250 V DC *, 115 V AC, binary input threshold 73 V ** 5

220 V to 250 V DC, 115 V AC, binary input threshold 154 V ** 6

*) A crossover of the two auxiliary voltage ranges may be carried out by means of plug-in jumpers**) The binary input thresholds are settable in three levels via plug-in jumpers, separately for each

binary input

Housing/ quantity of inputs and outputs 9

1/2 x 19’‘, 8 BI, 16 BO, Flush-mounting housing with screw terminals A

1/1 x 19’‘, 16 BI, 24 BO, Flush-mounting housing with screw terminals C

1/1 x 19’‘, 24 BI, 32 BO, Flush-mounting housing with screw terminals D

1/2 x 19’‘, 8 BI, 16 BO, Surface-mounting housing with screw terminals E

1/1 x 19’‘, 16 BI, 24 BO, Surface-mounting housing with screw terminals G

1/1 x 19’‘, 24 BI, 32 BO, Surface-mounting housing with screw terminals H

1/2 x 19’‘, 8 BI, 16 BO, Flush-mounting housing with plug-in terminals J

1/1 x 19’‘, 16 BI, 24 BO, Flush-mounting housing with plug-in terminals L

1/1 x 19’‘, 24 BI, 32 BO, Flush-mounting housing with plug-in terminals M

With 5 fast trip contacts, approx. 1 ms closing time1/1 x 19’‘, 16 BI, 24 BO, Flush-mounting housing with screw terminals N

With 5 fast trip contacts, approx. 1 ms1/1 x 19’‘, 24 BI, 32 BO, Flush-mounting housing with screw terminals P

With 5 fast trip contacts, approx. 1 ms1/1 x 19’‘, 16 BI, 24 BO, Surface-mounting housing with two-tier terminals Q

With 5 fast trip contacts, approx. 1 ms1/1 x 19’‘, 24 BI, 32 BO, Surface-mounting housing with two-tier terminals R

With 5 fast trip contacts, approx. 1 ms1/1 x 19’‘, 16 BI, 24 BO, Flush-mounting housing with plug-in terminals S

With 5 fast trip contacts, approx. 1 ms1/1 x 19’‘, 24 BI, 32 BO, Flush-mounting housing with plug-in terminals T

Region and operating language10

Region GE, language german (language changeable) A

Region World, language UK-english (language changeable) B

Region US, language US-english (language changeable) C

* English version exceptboth presetting, ANSI-curves, 60 Hz



� ��

0

�

*


Interface designations according to the designations of the device locations:

System interface: functionality and hardware 11

No system interface 0

IEC 60870-5-103, electrical RS232 1

IEC 60870-5-103, electrical RS485 2

IEC 60870-5-103, fiber optical 820 nm, ST connector 3

DIGSI/modem interface (on rear of device) and protection interface 1 12

See additional indication M 9

DIGSI/modem interface (on rear of device)

No DIGSI interface on rear of device 0

DIGSI 4, electrical RS232 1

DIGSI 4, electrical RS485 2

DIGSI 4, fiber optical 820 nm, ST connector 3

Protection interface 1

Optical 820 nm, two ST connectors for direct connection AFO length up to 1.5 km or communication networks

Optical 820 nm, two ST connectors for direct connection BFO length up to 3.5 km via multimode fiber

Optical 1300 nm, two ST-connectors for direct connection CFO length up to 10 km via monomode fiber

Optical 1300 nm, two FC-connectors for direct connection DFO length up to 35 km via monomode fiber

Functions 113

Trip mode 3-pole only without auto reclosure function 0

Trip mode 3-pole only with auto reclosure function 1

Trip mode 1- and 3-pole without auto reclosure function 2

Trip mode 1- and 3-pole with auto reclosure function 3

With protection interface 2, see additional indication N (position 6 = 3) 9

Functions 1

Trip mode 3-pole only without auto reclosure function 0

Trip mode 3-pole only with auto reclosure function 1

Trip mode 1- and 3-pole without auto reclosure function 2

Trip mode 1- and 3-pole with auto reclosure function 3

Protection interface 2

Optical 820 nm, two ST-connectors for direct connection AFO length up to 1.5 km or communication networks

Optical 820 nm, two ST-connectors for direct connection BFO length up to 3.5 km via multimode fiber

Optical 1300 nm, two ST-connectors for direct connection CFO length up to 10 km via monomode fiber

Optical 1300 nm, two FC-connectors for direct connection DFO length up to 35 km via monomode fiber


–

Position 11 12 13 14 15 16

� � � ��

Port C

Port C+ M

Port D

+ N

Port D

B C D E

Port B

0

�



Backup functions14

Without A

With emergency/backup time overcurrent protection B

Additional functions 14 remote commands / 24 remote messages

transformer extensions (harmonic restraint, vector group adaptation) 15

without without A

without with E

with without J

with with N

Ordering exaple: 7SD5221–4AA39–2AJ0 +M1AMultiterminal differential relayhere: Position 12 = 9 points to M1A, this means design withRS232 DIGSI interface on the rear of the device andprotection interface 1: 820 nm direct connection

Position 14 15 16

��


0

�


Optoelectrical communication converter(820 nm to electrical X21 or G703.1) 7

Optoelectrical communication converter 2

Converter for the serial connection of the 7SD52 multiterminal differentialrelay to the X21 or G703.1 synchronous communication interfaces.Optical connection with 820 nm / ST connector to 62.5/125 �m multimodefiber up to 1.5 kmElectrical connection via X21 or G703.1 interface

Additional order of interface modules

Description Order No.Protection interface module, opt. 820 nm, multimode cable, ST-connector, 1.5 km C53207-A322-D651-1Protection interface module, opt. 820 nm, multimode cable, ST-connector, 3.5 km C53207-A322-D652-1Protection interface module, opt. 1300 nm, monomode cable, ST-connector, 10 km C53207-A322-D653-1Protection interface module, opt. 1300 nm, monomode cable, FC-connector, 35 km C53207-A322-D654-1

–00

Position 6 7 8 9 10 11 12 13 14 15 16


AA0–65VX7

�

6

SIPROTEC 4 – 7SD522/523Multiterminal Differential Relay for Two-Six Line TerminalsAccessories

Fig. 25

2-pin connectorFig. 26

3-pin connector

Fig. 27

Short circuit link for currentcontacts

Fig. 28

Short circuit link for voltage/signal contacts

Fig. 24

Mounting railfor 19”rack

Description Order No. Size ofpackage

Supplier Fig

Connector 2-pinConnector 3-pin

C73334-A1-C35-1C73334-A1-C36-1

11

SiemensSiemens

2425

Crimp connectorCI2 0.5-1 mm2

Crimp connectorCI2 0.5-1 mm2

Crimp connectorCI2 1-2.5 mm2

Crimp connectorCI2 1-2.5 mm2

Crimp connectorType III+ 0.75-1.5 mm2

Crimp connectorType III+ 0.75-1.5 mm2

827039-1

827396-1

827040-1

827397-1

163083-7

163084-2

4000taped on reel1

4000taped on reel1

4000taped on reel1

1)

1)

1)

1)

1)

1)

Crimping tool for Typ III+Crimping tool for CI2

0-169422-10-825582-0

11

1)1)

19”mounting rail C73165-A63-D200-1 Siemens 32

Short-circuiting links- for current terminals- all other terminalsTerminal cover- large- small

(included)C73334-A1-C33-1C73334-A1-C34-1

C73334-A1-C31-1C73334-A1-C32-1

11

11

SiemensSiemens

SiemensSiemens

3536

55

1) tyco electronicAmperesstr. 7-11D-63225 LangenPhone:: +49 6103 709-0Fax +49 6103 709-223

Please check with your localrepresentative for local supplier

Product Description Versions Order Number

DIGSI 4

Software for operation and usageof protection devices of SiemensMS Windows program, running under MS Win-dows NT 4, MS Windows 95Including device templates, online manual

Professional

Complete version: Basis version and DIGRA 4, DIGSI REMOTE 4,SIMATIC CFC 4, Display Editor 4 and Graphic Tools 4 with licensefor 10 purchase. 1 copper connection cable included

Basis

Complete version with license for 10 PCs, 1 copper connectioncable included

Demo version

Functionality of Basis version without the availability ofcommunication with relays

7XS5402 – 0AA00

7XS5400 – 0AA00

7XS5401 – 0AA00

Copper connection cablefor DIGSI program

between PC and relay(9-pin female to 9-pin male)

7XV5100-4

Instruction Manual 7SD522/523 V4.00, English C53000-G1176-C132-1


Connection diagrams according to IEC Standard

Live status contact

NC or NO with Jumper

=

=

(~)

IL1

IL2

IL3

I4

VL1

VL2

VL3

V4

Q1

Q3

Q5

Q7

Q2

Q4

Q6

Q8

Serial

Interfaces

K1+

-K2

K3

K4

K5K6K7K8

K9K10K11K12K13

K14K15K16

R1R2R3R4

R5R6R7R8R9

R10R11R12BO 15

BO 14

BO 13

Fast BO1

Fast BO2

Fast BO3

Fast BO4

Fast BO5

Fast BO6

Fast BO7

BO8

BO9BO10

BO11

BO12

K17K18J1J2J3

J4J5J6

J7J8J9J10J11

BI 1

BI 2

BI 3

BI 4

BI 5

BI 6

BI 7

BI 8J12

R15

R16

R17

R18

R13

R14

Flush mounting

Surface mounting

25

50

24

49

23

48

22

47

20

45

19

44

21

46

43184217

41

401439

381337

123611

88638762

8661856084

598358

749973

9897729671

95709469

90

65

L+(15)

L-(16)

Figure 29

Housing 1/2 x 19’‘, Basic Version 7SD522/523*-*A, 7SD522/523*-*E and7SD522/523*-*Jwith 8 Binary Inputs and 16 Binary Outputs

Front interface

System/Scadainterface

Service interfaceDIGSI, Modem

Timesynchronization

A

B

C

Figure 30

Serial interfaces

Protectioninterface 2


E

D



Live status contactNC or NO with Jumper

=

=(~)

IL 1

IL 2

IL 3

I4

VL1

VL2

VL3

V4

Q1

Q3

Q5

Q7

Q2

Q4

Q6

Q8

Serial

Interfaces

K1+

-K2

K3

K4

K5K6K7K8K9K10K11K12K13K14K15K16

R1R2R3R4R5R6R7R8R9R10R11R12BO 1 5

BO 1 4

BO 1 3

P3P4

NC or NOwit h Jumper

BO16

P5P6P7P8

BO 17

BO 18

BO 19

BO 2 0

BO 2 1

BO 2 2

BO 2 3

P9P10P11P12P13P14P15P16

Fast BO1

Fast BO2

Fast BO3

Fast BO4

Fast BO5

Fast BO6

Fast BO7

BO8

BO9BO10

BO11

BO12

K17K18J1J2J3

J4J5J6

J7J8J9J10J11

BI 1

BI 2

BI 3

BI 4

BI 5

BI 6

BI 7

BI 8J12P17P18N1N2N3

N4N5N6

N7N8N9N10N11

BI 9

BI 10

BI 11

BI 12

BI 13

BI 14

BI 15

BI 16N12

R15

R16

R17

R18

R13

R14

Fl ush mounting

Surface mounting

50

100

49

99

48

9847

97

45

95

44

94

46

96

9040893986

368535

843483338232

173123172122171121170120169119168118

174

124

L+ (37)

L- (38)

7525742473

237222

712170206919

190140189139188

138

187137186136185135184134

149199148198197147196146195145194144

Figure 31

Housing 1/1 x 19’‘, Medium Version 7SD522/523*-*C, 7SD522/523*-*G and7SD522/523*-*L

Note: for serial interfaces see Figure 30





=

=

(~)

IL1

IL2

IL3

I4

VL1

VL2

VL3

V4

Q1

Q3

Q5

Q7

Q2

Q4

Q6

Q8

SerialInterfaces

K1+

-K2

K3

K4

K5K6K7K8K9K10K11K12K13K14K15K16

R1R2R3R4R5R6R7R8R9R10R11R12BO 15

BO 14

BO 13

P3P4NC or NO

with Jumper

BO16

P5P6P7P8

BO 17

BO 18

BO 19

BO 20

BO 21

BO 22

BO 23

P9P10

P11P12

P13P14

P15P16H3H4

NC or NO

with Jumper

BO24

H5

H6H7

H8

BO 25

BO 26BO 27

BO 28

BO 29

BO 30

BO 31

H9H10H11H12H13H14H15H16

Fast BO1

Fast BO2

Fast BO3

Fast BO4

Fast BO5

Fast BO6

Fast BO7

BO 8

BO 9BO 10

BO 11

BO 12

K17K18J1J2J3

J4J5J6

J7J8J9J10J11

BI 1

BI 2

BI 3

BI 4

BI 5

BI 6

BI 7

BI 8J12P17P18N1N2N3

N4N5N6

N7N8N9N10N11

BI 9

BI 10

BI 11

BI 12

BI 13

BI 14

BI 15

BI 16N12H17H18G1G2G3

G4G5G6

G7G8G9G10G11

BI 17

BI 18

BI 19

BI 20

BI 21

BI 22

BI 23

BI 24G12

R15

R16

R17

R18

R13

R14

Flush mounting

Surface mounting

50

100

49

99

48

9847

97

45

95

44

94

46

96

75

25742473

237222

7121702069199040893986

368535

8434833382326818671766

166515

641463136212

173123

122171121170120169119168118

149

199148198197147196146

195145194144

190140189139188138

172

187137186136185135184134166116165115164114

163113162112161111160110

174

124

L+ (37)

L- (38)

Figure 32

Housing 1/1 x 19’‘, Maximum Version 7SD522/523*-*D, 7SD522/523*-*H and7SD522/523*-*M with



Connection diagrams according to ANSI Standard

Figure 33

Housing 1/2 x 19’‘, Basic Version 7SD522/523*-*A, 7SD522/523*-*E and 7SD522/523*-*J with8 Binary Inputs and 16 Binary Outputs

Figure 34

Serial interfaces

=

=(~)

IA

IB

IC

I4

VA

VB

VC

V4

Q1

Q3

Q5

Q7

Q2

Q4

Q6

Q8

R15

R16

R17

R18

R13

R14

SerialInterfaces

K1+

-K2

K3

K4

K5K6K7K8K9K10K11K12K13K14K15K16

R1R2R3R4

R5R6R7R8R9R10R11R12BO 15

BO 14

BO 13

K17K18J1J2J3

J4J5J6

J7J8J9J10J11

BI 1

BI 2

BI 3

BI 4

BI 5

BI 6

BI 7

BI 8J12

Fast BO4

Fast BO5

Fast BO6

Fast BO7

Live status contact

NC or NO with Jumper

Fast BO1

Fast BO2

Fast BO3

BO8

BO9BO10BO11

BO12

Flush mounting

Surface mounting

25

50

24

49

23

48

22

47

20

45

19

44

21

46

4318421741

401439

381337123611

886387628661856084598358

74997398

9772967195709469

90

65

L+(15 )

L-(16)

Front interface

System/Scadainterface

Service interfaceDIGSI, Modem

Timesynchronization

A

B

CProtectioninterface 2


E

D




=

=

(~)

I A

IB

IC

I4

VA

VB

VC

V4

Q1

Q3

Q5

Q7

Q2

Q4

Q6

Q8

Serial

Interfaces

K1+

- K2

K3

K4

K5K6K7K8K9K10K11K12K13K14K15K16

R1R2R3R4

R5R6R7R8R9R10R11R12BO 15

BO 14

BO 13

P3P4

NC or NOwith Jumper

BO16

P5P6P7P8

BO 20

BO 21

BO 22

BO 23

P9P10P11P12P13P14P15P16

K17K18J1J2J3

J4J5J6

J7J8J9J10J11

BI 1

BI 2

BI 3

BI 4

BI 5

BI 6

BI 7

BI 8J12P17P18N1N2N3

N4N5N6

N7N8N9N10N11

BI 9

BI 10

BI 11

BI 12

BI 13

BI 14

BI 15

BI 16N12

Fast BO4

Fast BO5

Fast BO6

Fast BO7R15

R16

R17

R18

R13

R14


Fast BO1

Fast BO2

Fast BO3

BO8

BO9BO10BO11

BO12

BO 17

BO 18

BO 19

Flush mounting

Surface mounting

50

100

49

99

48

9847

97

45

95

44

94

46

96

7525742473

237222

7121702069199040893986

368535

843483338232

173123172122171121170120169119168118

19014018913918 8138

187137186136185135184134

174

124

L+ (37)

L-(38)

149199148198

197147196146195145194144

Figure 35

Housing 1/1 x 19’‘, Medium Version 7SD522/523*-*C, 7SD522/523*-*G and7SD522/523*-*L






=

=(~)

IA

IB

I C

I4

VA

VB

VC

V4

Q1

Q3

Q5

Q7

Q2

Q4

Q6

Q8

SerialInterfaces

K1+

-K2

K3

K4

K5K6K7K8K9K10K11K12K13K14K15K16

R1R2R3R4R5R6R7R8R9R10R11R12BO 15

BO 14

BO 13

P3P4

NC or NO

with Jumper

BO16

P5P6P7P8

BO 17

BO 18

BO 19

BO 20

BO 21

BO 22

BO 23

P9P10P11P12P13P14P15P16H3H4NC or NO

with Jumper

BO24

H5H6H7H8

BO 25

BO 26

BO 27BO 28

BO 29

BO 30

BO 31

H9H10H11H12H13H14H15H16

Fast BO1

Fast BO2

Fast BO3

Fast BO4

Fast BO5

Fast BO6

Fast BO7

BO8

BO9BO10BO11

BO12

K17K18J1J2J3

J4J5J6

J7J8J9J10J11

BI 1

BI 2

BI 3

BI 4

BI 5

BI 6

BI 7

BI 8J12P17P18N1N2N3

N4N5N6

N7N8N9N1 0N1 1

BI 9

BI 10

BI 11

BI 12

BI 13

BI 14

BI 15

BI 16N1 2H1 7H1 8G1G2G3

G4G5G6

G7G8G9G10G11

BI 17

BI 18

BI 19

BI 20

BI 21

BI 22

BI 23

BI 24G12

R1 5

R1 6

R1 7

R1 8

R1 3

R1 4

Flush mounting

Surface mounting

50

100

49

99

48

9847

97

45

95

44

94

46

96

7525742473

237222

7121702069199040893986

368535

8434833382326818671766

166515

641463136212

173123

122171121170120169119168118

149199148198197147196146195145194144

190140189139188138

187137186136185135184134166116165115164114

163113162112161111160110

174

124

L+ (37)

172

L- (38)

Figure 36

Housing 1/1 x 19’‘, Maximum Version 7SD522/523*-*D, 7SD522/523*-*H and7SD522/523*-*M



Dimension drawings

Figure 37

Flush mounting 1/2 x 19’‘ with screw andplug-in terminals

225 (8.86)

220 (8.66)

5 (0.20) or M4

6 ( 0.24)

255

.8±

0.3

(10.0

7±

0.01

2)

245

+1(9

.64

+0

.03

9)

4.3

(0.1

7)

7.3

(0.29)

13.2(0.52)

180 ± 0 .5 (7.09 ± 0.0 20 )

206.5 ± 0 .3 (8.13 ± 0.0 12 )

221 + 2 (8.70 + 0.0 79 )

244

(9.6

1)

266

(10.4

7)

2

(0.08)

29.5(1 .16)

172 (6.77) 34(1.34)

29(1.14)

30

(1.18)

266

(10.4

7)

29.5

(1 .16)

172 (6.77)

244

(9.6

1)

34

(1 .34)

2

(0.08)

Housing 1/2 x 19’‘Rear view

Housing 1/2 x 19’‘Panel cutout

Side view withscrew terminals

Side view withplug-in terminals

Note: Dimensions are indicated in millimeters;values stated in brackets are inches

E

D

C

B


Dimension drawings


Figure 38

Flush mounting 1/1 x 19’‘ with screw andplug-in terminals

450 ( 17.72)

445 ( 17.52)

25

5.8

±0

.3(1

0.0

7±

0.0

12

)

245

+1

(9.6

4+

0.0

39

)

6 (0.24)

4.3

(0.1

7)

7.3

(0.29)13.2(0.52) 13.2

(0.52)13.2

( 0.52)

216.1 ± 0.3 (8.51 ± 0.0 12 )

425.5 ± 0.3 (16.75 ± 0.0 12 )

446 +2 (17.56 + 0 .079 )

6 (0.24)

6 (0.24 )

6 (0.24)

5 (0.20)

or M4

5 (0 .20 )

o r M4

5 (0.20)or M4

5 (0.20)

or M4

24

4(9

.61)

26

6(1

0.4

7)

2(0.08)

29.5( 1.16)

172 (6.77) 34(1.34)

29(1.14)

30

(1.18)

266

(10

.47)

29.5( 1.16)

172 (6.77)

24

4(9

.61)

34(1.34)

2(0.08)

Housing 1/1 x 19’‘Rear view

Housing 1/1 x 19’‘Panel cutout

Side view withscrew terminals

Side view withplug-in terminals

E

D

C

B



9 (0 .35)

1 25

26 50

51 75

76 100

240 (9 .45)

219 (8.62) 10.5

(0.41)

225 (8.86)

280

(11

.02)

320

(12

.60)

344

(13

.54)

266

(10.4

7)

260 (10.24)

29.5(1.16)

71(2.80)

72(2.83)

52(2.05)

25

(0.9

8)

1 50

51 100

200

101

151

150

28

0(1

1.0

2)

32

0(1

2.6

0)

34

4(1

3.5

4)

10.5

(0.41)

465 (18.31)

444 (17.48)

450 (17.72)

9 (0.35)

Figure 39

Surface mounting 1/1 and 1/2 x 19’‘


Front viewHousing 1/1 x 19’‘

Front viewHousing 1/2 x 19’‘

Side view

Dimension drawings


Appendix

Explanation of ANSI numbers, IEC designation

ANSInumber

IEC ANSI Standard 7SD522/523

14 Underspeed device. A device that functions when the speed of a machinefalls below a determined value.

–

21

21N

Distance relay. A relay that functions when the circuit admittance, impedance,or reactance increases or decreases beyond a predetermined value.

Phase distance measurement

Ground distance measurementFL Fault locator25 Synchronizing or synchronism-check device. A device that operates when

two ac circuits are within the desired limits of frequency, phase angle and voltageto permit or cause the paralleling of these two circuits.

Synchro-check function

27

27WI

U< Undervoltage relay. A relay that operates when its input voltage is less than apredetermined value.

Phase-Ground undervoltage incombination with Weak Infeedtrip function

32 Directional power relay. A relay that operates on a predetermined value of powerflow in a given direction or upon reverse power flow such as that resulting from themotoring of a generator upon loss of its prime mover.

–

33 Position switch. A switch that makes or breakes contact when the main deviceor piece of apparatus that has no device function number reaches a given position.

Application of programmable logic

34 Master sequence device. A device such as a motor opoerated multicontact switch,or the equivalent, or a programming device, such as a computer, that establishesor determines the operating sequence of the major devices in equipment duringstarting and stopping or during other sequencial switching operations.


37 I< Undercurrent or underpower relay. A relay that functions when the current orpower flow decreases below a predetermined value.

Application of programmablelogic. Operating measured valueand limit value module

46 I2 Reverse-phase or phase-balance current relay. A relay that functions when thepolyphase currents are of reverse-phase sequence or when the polyphase currentsare unbalanced, or contain negative phase-sequence components above a givenamount.

1. Measured value supervision:current symmetry / balance2. Application of programmablelogic: Operating measured valueand limit value module

47 Phase-sequence or phase-balance voltage relay. A relay that functions upon apredetermined value of polyphase voltage in the desired phase sequence, whenthe polyphase voltages are unbalanced, or when the negative phase-sequence voltage.

1. Measured value supervision:voltage symmetry / balance2. Application of programmablelogic: Operating measured valueand limit value module

48 Incomplete sequence relay. A relay that generally returns the equipment to thenormal, or off, position and locks it out if the normal starting, operating, or stoppingsequence is not properly completed within a predetermined time.


49 Machine or transformer thermal relay. A relay that functions when the temperatureof a machine armature winding or other load-carrying winding or element of a machineor power transformer exceeds a predetermined value.

–

50

50N

50N-2

50BF50HS

50 STUB50N STUB

I>>, I>

3I0>>>,3I0>>, 3I0>

3I0>

Iph

I>>>

Iph STUB3I0 STUB

Instantaneous overcurrent relay. A relay that functions instantaneously on anexcessive value of current

Phase-overcurrent time protec-tion as backupGround overcurrent time protec-tion (directional)Ground-overcurrent time protec-tion as backup stageBreaker failure protectionInstantaneous high speeds-o-t-f protectionSTUB-bus overcurrent stage,phase and ground

51

51N

51N-2

Ip, 3I0p

3 I0p

3 I0p

AC time overcurrent relay. A relay that functions when the ac input current exceedsa predetermined value, and in which the input current and operating time are inverselyrelated d through a substantial portion of the performance range.

Phase-overcurrent inverse timeprotection as backup

Ground overcurrent inverse timeprotection (directional)Ground-overcurrent inverse timeprotection as backup stage

52 AC circuit breaker. A device that is used to close and interrupt an ac power circuit un-der normal conditions or the interrupt this circuit under fault or emergency conditions.

–

55 cos � Power factor relay. A relay that operates when the power factor in an ac circuitrises above or falls below a predetermined value.

Application of programmablelogic. Operating measured valueand limit value module


Explanation of ANSI numbers, IEC designation

ANSInumber

IEC ANSI standard 7SD522/523

59 U>>, U> Overvoltage relay. A relay that operates when its input voltage is more than apredetermined value.

Phase-ground and zero sequenceovervoltage

62 Time-delay stopping or opening relay. A time-delay relay that serves in conjunctionwith the dvice that initiates the shutdown, stopping or opening operation in anautomatic sequence or protective relay system.

Application of programmablelogic

64 UT> Ground detector relay. A relay that operates upon failure of machine or otherapparatus insulation to ground.

Ground fault detection

66 Notching or jogging device. A device that functions to allow that only a specifiednumber of operations of a given device or equipment, or a specified number ofsuccessive operations within a given time of each other. It is also a device thatfunctions to energize a circuit periodically or for fractions of specified time intervals,or that is used to permit intermittent acceleration or jogging of a machine at lowspeeds for mechanical positioning.

–

67 AC directional overcurrent relay. A relay that functions on a desired value of acovercurrent flowing in a predetermined direction

67 N Directional ground-fault timeovercurrent

68

68 T

Blocking relay is a relay that initiates a pilot signal for blocking or tripping on externalfaults in a transmission line or in other apparatus under predetermined conditions, orcooperates with other devices to block tripping or to block reclosing on an out-of-stepcondition or on power swings

Power swing blocking

Power swing tripping74

74 TC

Alarm relay. A relay other than an annunciator, as covered under device function 30,that is used to operate, or that operates in connection with, a visual or audible alarm.

Trip circuit supervision79 AC reclosing relay. A relay that controls the automatic reclosing and locking out of an

ac circuit interrupter.Auto reclosing function

81 Frequency relay. A relay that responds to frequency of an electrical quantity, operatingwhen the frequency or rate of change of frequency exceeds or is less than apredetermined value.

Application of programmablelogic: Operating measured valueand limit value module

85

85-21

85-67N

Tele-protection

Carrier or pilot-wire receiver relay is a relay that is operated or restrained by a signalused in connection with carrier-current or dc pilot-wire fault directional relaying.

Pilot schemes for distanceprotection

Pilot schemes for directionalground fault protection

86 Lockout relay. A hand or electrically reset auxiliary relay that is operated upon theoccurence of abnormal conditions to maintain associated equipment or devicesinoperative until it is reset

Trip signal lock-out

87 Differential protective relay. A protective relay that functions on a percentage, phaseangle, or other quantitive difference between two currents or some other electricalquantities.

see product range 7SD or 7UT


List of abbreviations used

A, B, C Phase designation according to ANSIAMZ curvesIDMT characteristics

Inverse time overcurrent protection

ANSI American National Standard InstituteAR Auto-reclosureARC Auto-reclosureBI Binary InputBO Binary OutputCFC Continuous Function ChartDCF77 Time synchronizing signal in GermanyDO Digital OutputEF Earth Fault detectionFlash-EPROM Electrically Programmable and Erasable MemoryFO Fiber Optic ConductorGPS Global Position SystemIBS CommissioningIEC International Electrotechnical CommissionIRIG B Time synchronizing signal via GPS

L1, L2, L3 Phase designation according to IECLED Light Emitting D iodeMHO Circle characteristic in the impedance planeNC Normally Closed output relay contact, e.g. contacts are closed if relay is not activatedNO Normally Open output relay contact, e.g. contacts are open if relay is not activatedOLM Optical Link ModulePLC Programmable Logic ControlPLC Power Line CarrierR RelaySC Substation ControllerSCADA Supervisory Control and Data AquisitionSICAM Substation Information Control Automation and Monitoring SystemSIMATIC SIEMENS Automation TechnologySIPROTEC SIEMENS PROTECTIONSIR Source to line impedance ratio

Ratio of the source impedance behind a relay terminal to the line impedance.UMZ curvesDT characteristics

Definite time overcurrent protection

Appendix


Notes


Siemens Companies and Representatives

Europe

AustriaSiemens AG ÖsterreichSiemensstr. 88 - 92A-1211 WienPhone: +43-1-1707-22522Fax: +43-1-1707-53075

BelgiumSiemens N.V.Chaussée de Charlerois 116B-1060 BrüsselPhone: +32-2-53621-2595Fax: +32-2-53621-6900

Czech. RepublicSiemens s.r.o.Evropska 33aCZ-16000 Prag 6Phone: +420-2-33032130Fax: +420-2-33032190

DenmarkSiemens A / SBorupvang 3DK-2750 BallerupPhone: +45-4477 4309Fax: +45-4477 4020

FinlandSiemens OyMajurinkatu 6FIN-02600 EspooPhone: +358-10-511 3846Fax: +358-10-511 3530

FranceSiemens S. A.39-47, boulevard OrnanoF 93527 Saint DenisPhone: +33-1-4922 3469Fax: +33-1-4922 3090

GreeceSiemens A. E.Artemidos 8GR-151 10 AthenPhone: +30-1-6864527Fax: +30-1-6864704

ItalySiemens S.p. A.Viale Savca 336I-20 126 MailandPhone: +39-02-66762854Fax: +39-02-66762213

IrelandSiemens Ltd.8-11 Slaney RoadBallsbridgeDublin 11Phone: +353-1-603 2430Fax: +353-1-603 2499

NetherlandsSiemens Nederland N.V.Prinses Beatrixlaan 26NL-2595 AL Den HaagPhone: +31-70-333 3126Fax: +31-70-333 3225

NorwaySiemens A / SOstre Aker vei 90N-0518 OsloPhone: +47-22-633140Fax: +47-22-633796

PolandSiemens Sp.z.o.o. Northul. Zupnicza 11PL-03-821 WarschauPhone: +48-22-8709120Fax: +48-22-8709139

Siemens Sp.z.o.o. Southul. Francuska 70PL-40-028 KatowicePhone: +48-32-2084153Fax: +48-32-2084159

PortugalSiemens S. A.Apartado 60300P-2700 AmadoraPhone: +351-1-417 8253Fax: +351-1-417 8071

SloveniaBranch office: SiemensAustria

SpainSiemens S.A.Ronda de EuropasE 28 760 Tres Cantos (Ma-drid)Phone: +34-91-5147562Fax: +34-91-5147037

SwitzerlandSiemens-Albis AGFreilagerstr. 28 - 40CH-8047 ZürichPhone: +41-1-495-3566Fax: +41-1-495-3253

TurkeySIMKO Ticaret ve Sanayi ASYakacik Yolu No:11181430 Kartal-Istanbul-TukeyPhone: +90-0216-4593741Fax: +90-0216-4592155

UngarnSiemens Rt.Gizella út 51-57H-1143 BudapestPhone: +(36-1) 471-1686Fax: +(36-1) 471-1622

United KingdomSiemens plcSir William Siemens HousePrincess RoadManchester M20 2URPhone: +44-1-614465130Fax: +44-1-614465105

Africa

EgyptSiemens Ltd.Cairo, P.O.Box 775 / 1151126, El Batal AhmedAbdel Aziz Str.Mohandessin, GizaPhone: +20-2-3313315Fax: +20-2-3313350

South AfricaSiemens Ltd.,300 Janadel AvenuePrivate Bag X71Halfway House 1685Phone: +27-11-652 2627Fax: +27-11-652 2263

Australia

Siemens Ltd., PT & DMelbourne Head Office885 Mountain HighwayBayswater VIC 3153Phone: +613-9721 2819Fax: +613-9721 5516

North America

USASiemens PT&D, Inc.7000 Siemens Rd.Wendell , NC 27591Phone: +1-800-347 6657

+1-919-365 2196Fax: +1-919-365 2552Internet:

www.siemenstd.com

MexicoSiemens S.A. DE C.V.Poniente 116, no. 590,Col. Ind. VallejoDelegacion Azcapotzalco02300 Mexico D.F.Phone: +52-5-3295336Fax: +52-5-3295324

South America

ArgentinienSiemens S.A.Fab. Ruta 8 Buenos Aires,Casilla de Correo 321650 San Martin-Prov. deB.A.Phone: +54114738 7100

ext 3910Fax: +54114738 7201

BrazilSiemens Ltda.Coronel Bento Bicudo, 111Lapa05069-900 Sao Paulo-SPPhone: +55-11-833 4079Fax: +55-11-833 4886

ColumbiaSiemens S.A., GDHSantafe de Bogota, D.C.Cra 65 No. 11-83Apartado 8 01 50ConmutaPhone: +57-1-294 2272Fax: +57-1-294 2500

Costa RicaSiemens S.A.,P.O. Box 10022-1000La Uruca200 Este de la PlazaSan JosePhone: +506 287 5120Fax: +506 233 5244

VenezuelaSiemens S.A.,Avenida Don DiegoCisneros/Urbanización LosRuicesCaracas 1071Phone: +58 2 2038109Fax: +58 2 2038613

Asia

Abu DhabiSiemens Resident Engi-neersP.O. Box 2154 DubaiUnited Arab EmiratesPhone: +9714 3319578Fax: +9714 3319547

ChinaSiemens Ltd., PT & DNo. 7, Wangjing ZhonghuanNanlu,Chaoyang DistrictBeijing, 100015Phone: +86-10-6436 1888

ext. 3806Fax: +86-10-6438 1464

Hong KongSiemens Ltd., PTD58/F Central Plaza18 Harbour RoadWanchai, Hong KongPhone: +852-2583 3388Fax: +852-2802 9908

IndiaSiemens Ltd., PTD / PlotNo. 6ASector-18/Maruti IndustrialAreaHUDA/Guragon-122001/HaryanaPhone: +91-124 346426

ext. 2100Fax: +91-124 346431

IndonesiaP.T. Siemens IndonesiaJl. Jend. A. Yani Kav. B67-68Pulo Mas, Jakarta 13210P.O.Box 2469Jakarta 10001Phone: +62-21-4729 100Fax: +62-21-471 5055,

472 9201

KoreaSiemens Ltd10th Floor Asia Tower Bldg726, Yeoksam-dong, Kang-man-guSeoul 135-719, KoreaPhone: +82-2-5277 805Fax: +82-2-5277 889

MalaysiaSiemensElectrical Engineering SdnBhd13th floor, CP Tower11 Section 16/11Jalan Damansara46350 Petaling JayaSelangor Darul EhsanPhone: +60-3-751 3929

(direct)Phone: +60-3-751 3888

(switchb.)Fax: +60-3-757 0380

PakistanSiemens Pakistan Engi-neering Co. Ltd GT&DAkhvan House38 Sir Aga Khan RoadLahore 54000, PakistanPhone: +92 42 6278758Fax: +92 42 6370932

PhilipinesSiemens Inc., PT & D14 F Centerpoint Bldg.J.Vargas corner Garnet St.Ortigas, Pasig City 1605Phone: +63-2-637 0900Fax: +63-2-633 5592

Saudi ArabiaSiemens Ltd PT&DJeddah Head OfficeP.O. Box 462121412 JeddahPhone: +966 2 6658420Fax: +966 2 6658490

+966 2 6630894

SingaporePower Automation89 Science Park, #04-13The Rutherford,Singapore 112861Phone: +65-872 2688Fax:+65-872 3692

TaiwanSiemens Ltd., PT & DDept.19th Floor, 333, Tun-HuaS. Road,Sec. 2, (P.O.Box 26-755)Taipei R.O.C.Phone: +886-2-2378 8900

ext. 832Fax: +886-2-2378 8958

ThailandSiemens Limited, EV SPDept.Charn Issara Tower II,32nd Floor2922/283 New PetchburiRoadBangkapi, HuaykwangBangkok 10320Phone: +66-2-715-4813Fax: +66-2-715-4785

VietnamSiemens AGRepresentationThe Landmark Building,2nd Floor5B Ton Duc Thang Str.District 1Ho Chi Minh CityPhone: +84-8825 1900Fax: +84-8825 158

Siemens AG Power Transmission and Distribution


Conditions of Sale and Delivery · ExportRegulations

Subject to theGeneral Conditions of Supplyand Deliveryfor Products and Services ofthe Electrical and ElectronicIndustry and to any other con-ditions agreed upon with therecipients of catalogs.

�

Technical data, dimensionsand weights are subject tochange unless otherwisestated on the individual pagesof this catalog.The illustrations are for refer-ence only.

We reserve the right to ad-just the prices and shallcharge the price applying onthe date of delivery.

A En 1.91a

Export Regulations Trademarks

In accordance with thepresent provisions of theGerman Export List and theUS Commercial Control List,export licences are notrequired for the productslisted in this catalog.

An export licence mayhowever be required due tocountry-specific applicationand final destination of theproducts.Relevant are the exportcriteria stated in the deliverynote and the invoicesubject to a possible exportand reexport licence.Subject to change withoutnotice.

All product designations usedare trademarks or productnames of Siemens AG or ofother suppliers.

Siemens Online

The Power Transmission andDistribution Group can alsobe found in the Internet:http://www.ev.siemens.de

Conditions of Sale and Delivery

Responsible forTechnical contents:Norbert Schuster ,Product Manager Differential ProtectionSiemens AG, EV S V13, Nuremberg, Germany

Ordering No: E50417-K1176-C114–A

Printed in Germany

catalog 7sd52 en

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