7sj512 catalogue

Overcurrent and Distance Relays

Siemens LSA 2.1.4 . March 1997 1

Application

The 7SJ512 is a numerical relay used fordefinite–time or inverse–time overcurrentprotection in medium–voltage distributionsystems. It is also used in back–upprotection schemes applied to lines,transformers and generators. The systemwhich the 7SJ512 is protecting, can besolidly earthed, unearthed or compen-sated. The relay can be implemented inconventional switchgear as well as withthe substation control system SINAUTLSA.

Construction

Within its compact design, the devicecontains:� All components for analog value ac-

quisition and numeric evaluation� Operator panel with display field� Event/alarm and trip/command output

contacts� Binary input options� Serial interfaces� Auxiliary voltage converter (DC/DC

converter).The device can be supplied in three casevariations. The variants for panel surfacemounting is supplied with two–tier ter-minals accessible from the front. Thevariants for panel flush mounting orcubicle mounting have rear connectionterminals and are available with or with-out glass cover.

Implemented functions/features

The following functions are available:� Definite–time/inverse–time overcur-

rent protection� Reverse interlocking (busbar protec-

tion scheme)� Overload protection (with memory)� Circuit–breaker failure protection� Trip test, reclose test� Earth–fault protection, optical definite–

time/IDMT� Sensitive earth–fault protection and

directional function using the sensitiveearth–current input for compensatedand isolated networks, as well as highimpedance starpoint earthing

� Auto–reclosure� Optional directional element� Inrush stabilization� Dynamic parameter switching� Parameter–set switching� Display of on–load measured current

values� Fault recording.

Mode of operation

With the application of a powerful micro-controller and digital filtering, the influ-ence of high–frequency transients, dis-placement voltages and currentcomponents can be suppressed to alarge degree.When the definite–time characteristic isselected, the measured values are calcu-lated using Fourier analysis. When usingthe inverse definite minimum time characteristic, either effective (r.m.s.) val-ues or fundamental values (from a Four-ier analysis) can be selected for grading.

Serial interfaces

The device is equipped with two serialinterfaces.The operating interface on the front panelis suitable for the connection of aWINDOWS capable PC. The DIGSI oper-ating program under the DOS operatingsystem extension WINDOWS allowseasy setting, fault recording evaluationand commissioning.The system interface is an 820 nm fibre–optic interface for linking to the SINAUTLSA substation control and protectionsystem or a protection master unit (pro-tocol to IEC 870–5–103). The operatingPC with DIGSI can also be connected tothe system interface.

Settings

Using the integrated operating panel theindividual parameters can be set underuser guidance. The PC program DIGSIpermits configuration and parameteriza-tion of the 7SJ512 in advance on the PC.The data stored can be read onto theprotection device via the interfaces. Theyare written to non–volatile memories sothat setting values are backed–up even ifthe power supply should fail.

Self monitoring

All important hardware and softwarecomponents are monitored continuously.Any irregularities in the hardware or pro-gram sequence are immediately detectedand alarmed. As a result, a very high se-curity, reliability and availability of theprotection relay is achieved.

7SJ512 Numercial overcurrent–time protection (Version V3.1, IEC)

Fig. 17SJ512 numerical overcurrent–time protection relay

49

50

50N

50HS

50HSN

Scope of functions

grounded, insulated or compensated networks

51

51N

67

67N

79

BF

Siemens AG 1997�


Siemens LSA 2.1.4 . March 19972

Overcurrent–time protection

The function is based on a phase–selec-tive measurement of the three phase cur-rents and the earth current. According tothe specific requirement, either the defi-nite–time or the inverse–time overcurrentmode can be selected. Both the definite–time and the inverse–time protectionmodes have two levels of operation, i.e.apart from the overcurrent element (�>),a high–set element (��) is also provided.The following inverse–time characteris-tics are available in the relay (accordingto BS 142 or IEC 255–4):

� normal inverse

t � 0.14(��p)0.02 –1

� tp

� very inverse

t � 13.5��p –1

� tp

� extremely inverse

t � 80(��p)2 –1

� tp

� user specific

Characteristics defined by 60 cur-rent/time pairs, entered by the user

Only for earth–faults:� long–time earth–fault

t � 120��p –1

� tp

t tripping timetp time multiplier� fault current�p current setting


Fig. 2Tripping time characteristics, normal inverse (IEC 255–4)

50

tp = 0.05

tp = 3.2

tp = 1.6

t [s]

�/�p

10070

20

10

75

2

1

0.7

0.5

0.2

0.1

0.07

0.05

0.02

0.011 2 3 5 7 10 20

tp = 0.1

tp = 0.2

tp = 0.5

tp = 1

Fig. 3Tripping time characteristics, very inverse(IEC 255–4)

t [s]

�/�p

70

50

20

1075

2

10.70.5

0.2

0.1

0.07

0.05

0.02

0.011 2 3 5 7 10 20

tp = 1.6

tp = 0.5

tp = 0.2

tp = 0.1

tp = 0.05

tp = 1

100

tp = 3.2

Fig. 4Tripping time characteristics, extremely inverse(IEC 255–4)

t [s]

�/�p

100 70

50

20

10

7

5

2

1

0.7

0.5

0.2

0.1

0.07

0.05

0.02

0.011 2 3 5 7 10 20

tp = 0.05

tp = 0.1

tp = 0.2

tp = 0.5

tp = 1

tp = 1.6

tp = 3.2



Sensitive earth–fault protection

A sensitive earth–fault current input isprovided for isolated and compensatednetworks. The sensitive earth current �EEand the displacement voltage Ve aremeasured and used to determine thedirection of the fault current.The designation of the fault direction isachieved using a reactive powermeasurement (a sine measurement withimaginary earth current for isolated net-works) and an active power measure-ment (a cosine measurement with realearth current for compensated net-works). The influence of harmonics andthe DC component are considerably re-moved through filtering. The earth–faultdetection can be directly allocated toalarm contacts or trip contacts. To adaptto special network conditions, the direc-tional characteristic can be adjusted witha correction angle (see Fig. 5). The direc-tional determination made by the relaywhen using the correction angle resultsfrom the sign of the active power P ‘(thepower as defined by the directional char-acteristic). In order for the relay to decideon the direction of a fault, the directionalearth element must first pick up.The sensitive earth–fault function can beused in the following four ways:� Sensitive earth–fault (SEF) overcurrent

(�EE>) with the following definite–timeor inverse–time characteristics:Normal inverseVery inverseExtremely inverseLong–time earth–faultUser specific

� SEF ”high–set” overcurrent (�EE�)with definite–time

� Directional earth–fault protection withinstantaneous and high–set instanta-neous overcurrent

� Tripping due to displacement voltage.

Auto–reclose function

The 7SJ512 is equipped with an auto–re-close function. The relay trips three–poleand can make up to ten reclose at-tempts, one rapid autoreclose (RAR), andup to nine delayed auto–reclosures(DAR). If the fault still exists after the lastset reclose attempt, the relay trips with-out reclosing (see Fig. 6).The following functions are possible:� AR with every type of fault� Separate settings for ph–ph and ph–

gnd faults� Multiple AR (1 RAR, and up to 9 DARs

with different dead times for RAR andDAR

� Separate protection configurations andreclose triggers for the RAR and DARsfor the following functions:

– High–set phase overcurrent– Normal phase overcurrent (directional

and/or non–directional)– High–set earth–fault– Normal earth–fault (directional or non–

directional)– Second stage sensitive earth–fault

(”high–set” sensitive earth element)– Sensitive earth–fault (directional or

non–directional)� Blocking of AR with binary input and

high–set pick–up.

Directional element (option)

The directional element of the 7SJ512 isphase–selective and separate for theearth–fault protection. These directionalearth–fault and phase overcurrent ele-ments work in parallel to the non–direc-tional (overcurrent and high–set over–cur-rent) elements. The non–directionalovercurrent element serves as a back–upprotection. The following functions arepossible with directional option:� Independently set tripping direction for

phase and earth overcurrent� Definite–time or inverse–time charac-

teristics selectable for directional trip-ping or pick–up

� Calculation of the displacement volt-age from the line voltage without usingan open delta winding

� Directional determination using themeasured currents and the soundphase line–line voltages.The corresponding phase voltage is de-pendent upon the type of fault that therelay detects. The relay determinesthe type of fault by using voltagememory or actual voltage.

Inrush stabilization

When switching on a transformer the7SJ512 can distinguish between inrushand real short–circuits. Inrush is particu-larly noticeable by its relatively high se-cond harmonic content. In the case of ashort–circuit, the second harmonic con-tent is almost non–existent. The har-monic stabilization operates indepen-dently for each of the three phases.When using inrush stabilization on onephase, it is also possible to block the re-maining phases (cross block). When us-ing inrush detection the pick–up of thehigh–set element stays active, and thenormal overcurrent element is blocked.

Intermittend earth–fault protectionwith firmware V3.1

Intermittend (re–striking) faults occur dueto insulation weaknesses in cables or asa result of water penetrating cable joints.Such faults either simply cease at somestage or develop into lasting short–cir-cuits. During intermittent activity, how-ever, starpoint resistors in networks thatare impedance–earthed may undergothermal overloading. The normal earth–fault protection cannot reliably detect andinterrupt the current pulses, some ofwhich can be very brief.The selectivity required with intermittentearth faults is achieved by summatingthe durations of the individual pulses andby triggering when a (settable) summedtime is reached. The response threshold��E> evaluates the rms value, referred toone systems period.


Fig. 5Directional determination using cosine measure-ments

forwardreverse

P ’<0

P ’ > 0

VE

P ’ > 0

�EE . cos �

P ’ < 0

��

� Correct = +15�

�EE > directional

Fig. 6Auto–reclose function

ARControl logic

Phase

Earth

Lastcycle

DT/IDMT2nd to 10th

cycleDT/IDMT

1 st cycleDT/IDMT

Lastcycle

DT/IDMT2nd to 10th

cycleDT/IDMT

1 st cycleDT/IDMT



Thermal overload protection(IEC 255–8)

For the protection of cables or machines,an overload protection with a pre–warn-ing stage for temperature and current isimplemented. The temperature of theequipment to be protected is determinedusing a thermal homogeneous bodymodel that contains energy input to theequipment and energy output to the envi-ronment. In this way currents thatchange over time and pre–loading can betaken into account (overload protectionwith memory).Using a parameter, it is possible to selectwhether the maximum of the phase–re-lated conductor temperature or the meanvalue of these is to be taken as the deter-mining value. It is also possible to calcu-late the temperature from the maximumvalue of the conductor current.

Circuit–breaker failure protection

After the issue of a trip command by therelay or upon the excitation of a binaryinput by an external protection, the break-er–failure current check function is initi-ated.If current is still detected after the settime (e.g. in the case of a breaker fail-ure), an alarm relay or a command relay(for breaker–failure tripping) can be ener-gized.In addition, a trip command can be issuedto a higher–level circuit–breaker.

Dynamic parameter switching

With the help of binary inputs or the inte-grated operator panel, the pick–up valuesof the relay can be quickly switched to anew set of values. It is thereby possibleto match certain parameters to specificsystem conditions, even during a fault.The following fault detectors can bechanged in this manner:� High–set element for phase and earth� Normal overcurrent element for phase

and earth� High–set element for sensitive earth� Normal overcurrent element for sensi-

tive earth.

Parameter set switching

With the help of a binary input, the inte-grated operator panel or with the PC, 4 completely separate sets of parametersettings are switchable. When changinga network configuration with a contact, itis possible to simultaneously match therelay‘s parameter settings via a binaryinput on the relay.

Fault recording

The digitized analog values of phase cur-rents, earth current and line voltages arestored in the event of a fault. The analogvalues recorded can be transferred to aPC where they can be displayed, ana-lyzed and archived using DIGSI. As anoption they can be read out by theLSA 678 substation control and protec-tion system.The serial interface complies with IEC870–5––103 protocol standards. Up toeight fault recordings can be stored. Thefault recording buffer is a ring buffer witha maximum length so that when it is fullevery new network fault overwrites theoldest recorded fault. A total of 5 se-conds are available for the recordingduration.

Marshalling of command and alarm/event relays, LEDs and binary inputs

The relay is supplied with a number oftrip/command and alarm/event output re-lays. For user specific alarms, flags andtrips, all command relays, signal relaysand LEDs are freely marshallable. A num-ber of annunciations can be grouped to-gether to create a special annunciationfor flags, alarms and trips. The LEDs canbe allocated to show instantaneousconditions (self– resetting), or to stay lituntil the LEDs are manually reset(latched). All LED information, which isset to remain lit until the LEDs are manu-ally reset (latched), are restored at pow-er–up if the relay loses auxiliary power.All binary inputs can also be freely mar-shalled.

Measured values and watchdog func-tions

A large number of measured value andmonitoring functions are integrated in the7SJ512:� Monitoring of current sum, current

symmetry, voltage sum, voltage sym-metry, phase sequence

� Operational measurements of �L1, �L2,�L3, �E (active �EE and reactive �EE)

� Operational measurements of VL1,VL2,VL3, VE

� Active, reactive and apparent powermeasurements

� Frequency measurement� Trip monitoring with the circuit–

breaker� cos ��measurement.

Indications

The relay saves an events list (opera-tional record), fault reports and a waveform for analysis of disturbances. All ofthe following signal memories are backedup in case of power failure.� Time

The relay contains an internal clockwith battery back–up which can besynchronized using a binary input. Allalarms are time and data stamped.

� Fault indicationsThe fault indications of the last threedisturbances are always available.

� Operational indicationsAll annunciations which do not belongto the fault indications are saved in theoperational indications.

� Earth–fault recordingIf the sensitive earth–fault element isenabled, this record will be availablefor each earth fault.

� Switching statisticsThe number of three–pole trips, RARsand DARs as well as the sum of cur-rents interrupted in each phase are in-dicated.

Automatic display on the LCD

An operating mode exists, where 2 op-erational measured values can be dis-played on the LCD. These values are reg-ularly updated by the relay. After a fault,two user– selectable fault event data canbe automatically displayed on the LCD.




Technical data

Input circuits Rated current �NRated voltage VNRated frequency fNThermal overload capability in voltage path, continuous

in current path, continuous1 s

in current path for sensitiveearth–fault detection

continuous10 s1 s

Dynamic overload capability (half cycle)Burden, voltage inputs

current inputs at �N = 1 Aat �N = 5 A

Earth–fault detection at 1 A

1 or 5 A100 to 125 V50 or 60 Hz140 V4 x �N100 x �N

15 A100 A300 A250 x �Napprox. 0.5 VAapprox. 0.1 VAapprox. 0.2 VAapprox. 0.3 VA

Voltage supplyvia integrated DC/DC converter

Rated auxiliary voltage Vaux/permissible tolerance

Max. ripple at rated voltagePower consumption, quiescent

energizedMax. bridging time during loss of auxiliary voltage

24, 48 V DC 19 to 56 V DC60, 110, 125 V DC 48 to 144 V DC220, 250 V DC 176 to 288 V DC�12 %approx. 12 Wapprox. 23 W�50 ms for Vaux �110 V DC

Binary inputs Number without directional optionwith directional option

Voltage rangeCurrent consumption independent of operating voltage

8 (marshallable)5 (marshallable)24 to 250 V DCapprox. 2.5 mA

Alarm/event contacts Number of relayswith 1 C/O contact eachwith 1 NO contact each

Alarm/event relay with C/O contactSwitching capacity make/breakSwitching voltagePermissible current, continuous

8 (marshallable)6 (marshallable)2 (marshallable)120 W/VA250 V AC/DC1 A

Command contacts Number of relays, with 2 NO contacts eachwith 1 NO contact each

Switching capacity makebreak

Switching voltagePermissible current continuous

0.5 s

2 (marshallable)2 (marshallable)1 000 W/VA30 W/VA250 V AC/DC5 A30 A

LEDs Ready indication greenBlocked indication redMarshallable LEDs red

116

Serial interfaces Operator interfaceConnection

Potential–free interface for data transmission to a central unitStandard

Transmission rate

Transmission reliabilityConnection, electrical on flush–mounted housing

on surface–mounted housing

DistanceTest voltage

Fibre–optic cable

Optical wavelengthPermissible attenuationDistance

No characters

Not isolatedon the front, 25–pole D–type submin. frontport (ISO 2110) for connection to a PCIsolatedSimilar to V.24/V.28 (RS232C) to EIA, proto-col acc. to DIN 19 244/IEC 870–5–1039600 Bauds setting as supplied; max. 19,200 Bauds, min. 4800 BaudsHamming distance d = 4at rear, 4–pole module connectorat two–tier terminal at the top and bottomof the housingCable with 2 core pairs, with individual andcommon screening, e.g. LIYCY–CY/ 2 x 2 x 0.25 mm2

max. 1 km2 kV with rated frequency for 1 minintegrated FSMA connectors for FOconnectionon flush–mounted housing: at rearon surface–mounted housing: at the bot-tom of the housing820 nmmax. 8 dB with glassfibre 62.5/125 �mmax. 2 kmswitchable, ”light off” setting as supplied




Technical data (continued)

CE–conformity, standards This product is in conformity with the directives of the Council ofthe European Communities on the approximation of the laws ofthe Member States relating to the electromagnetic compatibility(EMC Council Directive 89/336/EEC) and concerning electricalequipment for use within specified voltage limits (low–voltagedirective 73/23/EEC). The product conforms with the internationalstandard IEC 255 and the national standard DIN 57 435 part 303(corresponding to VDE 0435 part 303).The relay is designed for use in an industrial environment, forinstallation in standard relay rooms and compartments so thatwith proper installation electro–magnetic compatibility (EMC) isensured.

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

Insulation tests

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

2 kV (rms), 50 Hz2.8 kV DC5 kV (peak), 1.2/50 �s, 0.5 J,3 positive and 3 negative shots at intervalsof 5 s

EMC–tests; immunity (type test)

Standards: IEC 255–6, IEC255–22(international product standard)EN 50082–2 (generic standard)VDE 0435 part 303 (Germanproduct standard)

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

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

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

10 V/m, 27 to 500 MHz

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

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

10 V, 150 kHz to 80 MHz, AM 80 %, 1 kHz,

30 A /m, continuous, 300 A /m for 3 s, 50 Hz0.5 mT; 50 Hz

EMC–tests; emission (type test)

Standard: EN 50081–* (European generic standard)

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

150 kHz to 30 MHzclass B30 to 1 000 MHzclass A

Climatic conditions Permissible ambient temperature in serviceduring storageduring transport

Humidity rating

–5 to +55 �C–25 to +55 �C–25 to +70 �Caverage per year �75 % relative humidity;on 30 days per year up to 95 % relativehumidity; condensation not permissible

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

Permissible mechanical stress in service

during transport

10 to 60 Hz; 0.035 mm amplitude60 to 500 Hz; 0.5 g acceleration5 to 8 Hz; 7.5 mm amplitude8 to 500 Hz; 2 g acceleration

Construction of unit Case, dimensionsWeight flush mounting/cubicle mounting

surface mountingDegree of protection according to EN 60 529

7XP20, see dimension drawingsapprox. 9.5 kgapprox. 11 kgIP 51

Earth–fault detection Earth–fault detection with displacement voltage VE>Faulted phase indication (only with directional option)

VPH–E < the faulted phaseVPH–E > the healthy phaseMeasuring tolerance according to VDE 0435, part 303(for sinusoidal quantities)

Directional determinationMeasuring principleEarth–fault current �EE>/�EEP (active and reactive)Angle correction for core balance CT errorAdjustment of directional characteristicMeasuring tolerance according to VDE 0435, part 303(for sinusoidal quantities)

3 to 130 V

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

Active/reactive power calculation3 to 1 600 mA0 to 5� for 2 CT operating points–45 to +45��10 % of set value





Overload protection Factor kTime constant rWarning temperature �Alarm

Current warning stage �Alarm

0.1 to 41 to 999.9 min50 to 100%0.1 to 4 x �/�N

Breaker–failure protection Pick–up threshold �>Delay time tbreak.fail.prot.

0.1 to 4 x �/�N0.06 to 60 s and infinity

Setting ranges

Definite–time overcurrent protection Overcurrent phase �>earth �E>

High–set current phase ��earth �E�

Delay timesTolerances

Current pick–up valueTimeReset time

�/�N = 0.05 to 25= 0.05 to 25

�/�N = 0.05 to 25= 0.05 to 25

0 to 60 s or infinity

�5 % of set value�1 % or �10 msapprox. 30 ms

Inverse–time overcurrent protection Overcurrent phase �P>earth �EP>

High–set current phase ��earth �E�

Time multiplier tpPick–up valueCharacteristics according to IEC 255–4,Section 3.5.2 or BS 142

User specific characteristicAdditional characteristics for earth faults

Long time inverse

Pick–up value

�p/�N = 0.1 to 4�EP/�N = 0.1 to 4�/�N = 0.05 to 25

= 0.05 to 250 to 10 s1.1 x �pNormal inverse, very inverse, extremelyinverse, �/�p = 1 to 20, definite–time char-acteristic above 20 x �pInput of 60 current/time pairs

�/�p = 1 to 20, definite–time characteris-tics above 20 x �p

1.1 x �p

Linear current rangeTolerances

Pick–up valueTime

25 x �N

�5 %�5 % for 2 �(�/�p>) �20 and tp = 1

Directional elements Directional definite–time and inverse–timeovercurrent protection with back–upnon–directional high–set elementPick–up for definite–time phase

definite–time earthinverse–time phaseinverse–time earth

Characteristics according to IEC 255–4,Section 3.5.2 or BS 142Additional characteristics for earth faults

Directional determinationphase �L1phase �L2phase �L3earth �E

Timesshortest tripping timereorientation time after current reversaltripping time delaytimer tolerance

Tolerancescurrent pick–up valuetime

�/�N = 0.05 to 25= 0.05 to 25

�P/�N = 0.1 to 4= 0.1 to 4

Normal inverse, very inverse,extremely inverseLong time inverse,residual dependent time

With �L1 and VL3 – VL2With �L2 and VL1 – VL3With �L3 and VL2 – VL1With �E and VE/VL1 + VL2 + VL3

approx. 30 msapprox. 30 ms

0 to 320 s�1 % of set value or 10 ms

5 % of set value�5 % for 2 �(�/�E>) �20 and1 s �tIE �30 s

Fault recording Measured valuesTrigger

Recording durationHolding time

iL1, iL2, iL3, iE, vL1, vL2, vL3, vETrip, fault detection, binary input, LSA, integrated operator panelmax. 5 sUntil fault–recording buffer full. New faultentries overwrite the oldest recordedfaults.





Auto–reclose function Number of possible auto–reclosures, 3–pole

Configuration modes for phase faultsinitiation possible with

with directional option

Configuration modes for earth faultsinitiation possible with

with sensitive earth–fault

with directional option

1 RAR (rapid auto–reclose),and up to 9 DARs (delayed auto–reclose)

High–set overcurrent ��Normal overcurrent definite–time �>,or inverse–time �p non–directionalNormal overcurrent definite–time �>or inverse–time �p directional

High–set overcurrent �E�Normal overcurrent definite–time �E>,or inverse–time �EP non–directionalHigh–set overcurrent �EE�, directionalor non–directionalNormal overcurrent definite–time �EE>,or inverse–time �EEp directional or non–directionalNormal overcurrent definite–time �E>or inverse–time �EP directional

Action time, dead time RARDead time DARReclaim timeClose command duration

0.01 to 320 s0.01 to 1 800 s0.5 to 320 s0.01 to 320 s

Additional functions Operating values forCurrentVoltagePowerFrequencyPower factorActive/Reactive �EEEffective range Current

VoltagePower

Tolerance

�L1, �L2, �L3, �EVL1, VL2, VL3, VEActive/Reactive/Apparentfcos ��EEw, �EEb10 to 240 % �N10 to 120 % VN10 to 120 % PN

�2 % of respective rated value




Selection and ordering data

Order No.7SJ512 numercial overcurrent–time protection relay 7SJ512 � – � � A � � – � � A 0

Rated current at 50/60 Hz AC1 A5 A

15

Rated auxiliary voltage Vaux for integrated DC/DC converter24, 48 V DC60, 110, 125 V DC220, 250 V DC

245

Construction7XP2030–1 housing for panel surface mounting7XP2030–2 housing for panel flush mounting or cubicle mounting with two tier terminals7XP2030–2 housing for panel flush mounting or cubicle mounting, without glass cover7XP2030–2 housing for flush or cubicle mounting, Weidmüller terminals, US foil for front panel 1)

7XP2030–2 housing for flush or cubicle mounting, ring cable lugs, US foil for front panel 1)

BCEFG

Language, country–specific presettingsGerman/English; 50 Hz (Europe)American ANSI/IEC V3.6; 60 Hz (US–version)

02

Real–time clock non–volatile alarm memory software generationwith clock with non–volatile memory Version V1.1x (not for US–version)with clock with non–volatile memory Version V3

13

Optional functionsWithout directional elements, without intermittend earth–fault protectionWith directional elements, without intermittend earth–fault protectionWithout directional elements, with intermittend earth–fault protection (not for US–version)With directional elements, with intermittend earth–fault protection (not for US–version)

0123

Serial system interface (isolated, hard–wired on request)WithoutWith isolated RS232C (V.24) interface (wire connected)With integrated fibre–optic interface (820 nm)

ABC

Operating program (German and Englisch are standard, other languages on request) Order No.

DIGSI Version V3 for Windows, full version for 10 PCs and update for 3 years, GermanEnglish

7XS5020–0AA007XS5020–1AA00

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

7XS5021–0AA007XS5021–1AA00

Documentation Order No.

German: Katalogblatt LSA 2.1.4 Digitaler Überstromzeitschutz 7SJ512 (Version V3.1)Gerätehandbuch Digitaler Überstromzeitschutz 7SJ512 (Version V1)Gerätehandbuch Digitaler Überstromzeitschutz 7SJ512 (Version V3.1)

E50001–K5712–A141–A3

C73000–G1100–C89–2

C53000–G1100–C102–2

English: Catalog LSA 2.1.4 7SJ512 Numercial overcurrent–time protection (Version V3.1 IEC)Manual 7SJ512 Numercial overcurrent–time protection (Version V1.0)Manual 7SJ512 Numercial overcurrent–time protection (Version V3.1)

E50001–K5712–A141–A3–7600

C73000–G1176–C89–5

C53000–G1176–C102–2

US–Engl.: Catalog LSA 2.1.30 7SJ512 Numercial feeder protection (version V3.6)Manual 7SJ512 Numercial feeder protection (version V3.6)

E50001–K5712–A411–A1–4A00C53000–G1140–C102–1

1) Housing with US front–foil (9th digit of orderno. F or G) are to be ordered only for US–ver-sion (11th digit = 2). See also catalog LSA2.1.30, 7SJ512 Numerical feeder protection(Version V3.6), Order No. E50001–K5712–A411–A1–4A00





Fig. 7Connection diagram, 7SJ512 numerical overcurrent–time protection relay

not allocated

not allocated

��

��

��

��

L1

L2

L3

General fault detection O/C

Fault detection � >> L1, L2, L3

Fault detection �E >>

Device trip forward

��

��

��

not allocated

��

�

��

��

��

�

��

��

��

�

�

��

�

Power supply

* option dependent directionaldetermination or binary inputs

11

��

��

��

��

Device operative

Device trip

Trip �� E � ��

General trip O/C

LED reset

Block �� E � ��

Manual close

Fault recording

not allocated

not allocatedAlarm relay 9

Alarm relay 8

Alarm relay 7

Alarm relay 6

Alarm relay 4

Alarm relay 3

Alarm relay 2

7SJ512

5D1

7D2

8D17D3

8D38D2

7D16D36D26D15D35D2

Alarm relay 1

3C2

4C1

4C2

2C12C2

Fibre–optic interface coupling tocentral unit

3C1

1C1

1C25A1

6A17A1

6A27A25A2

7A36A3

7A46A4

7C37C1

7C27C4

8A28A1

8A48A3

8C38C1

8C28C4

Commandrelay 1

2A12A2

3A3

3A1

1A1

2A32A4

1

3

2

4

23

24

22

21

19

20

16

Version for panel flush mounting/cubicle mounting

Version for panel surface mounting

5

6

7

8

40

3741

3938

4342

4544

5150

5352

5455

5657

4614

1547

2827

3029

3112

1332

4D24D1

Binaryinput 1

��

��10

2A22A123

3A43A3

22

3A23A1

21

4A44A39

4A24A1

2526

5A45A3

4849

24

1D41D3

3536

1D21D133

34

3A2

3A4

1A2

17

18

6D4

7D48D4

58

6059

*

*

*

Commandrelay 2

Commandrelay 3

Commandrelay 4

Binaryinput 2

Binaryinput 3

Binaryinput 4

Binaryinput 5

Binaryinput 6 *

Binaryinput 7 *

Binaryinput 8 *

not allocated

not allocated

not allocated

Alarm relay 5

CB ready



Dimension drawings in mm

Fig. 87SJ512 with housing 7XP2030–2 (for panel flush mounting or cubicle mounting)

Front view Side view Panel cutout

131.5105

146

7.313.2

255.

8

245

266

231.5

30 29.5

1.5

5.4

150

145

10

Fibre–opticconnection 24

4

172

Diam. 5 or M4

Diam. 6

Fig. 97SJ512 with housing 7XP2030–1 (for panel surface mounting with two–tier terminals)

Front view Side view

260

29.5

266

71Z

280

344

159

144

Fibre–optic interface

116

1.539

Cutout 20 x 60 (without paint)

6031 45

3015

46

27

40

. . . . .

. . . . .

. . . . .

. . . . .

Detail Z:



Conditions of Sale and Delivery

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

�

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

The illustrations are for reference only.

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

Export Regulations

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

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

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

Subject to change without notice.

Trademarks

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

Dimensions

All dimensions in this catalog are given inmm.

Siemens online!

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

http://www.ev.siemens.de

Responsible for

Technical contents: Hans Heining–Triebs,Siemens AG, EV S V13, Nürnberg

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

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

A 9.91 a

Siemens Aktiengesellschaft

BereichEnergieübertragung und -verteilungGeschäftsgebiet SekundärsystemePostfach 48 06D-90026 Nürnberg

Order No.: E50001-K5712–A141-A3–7600Printed in GermanyKG K 0397 3.0 SD 12 En 321 539 6101/U543

PowerTransmissionand Distribution

7sj512 catalogue

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