7/24/2019 7SJ511 Catalogue EN http://slidepdf.com/reader/full/7sj511-catalogue-en 1/12 Overcurrent and Distance Relays Siemens LSA 2.1.3. March 1997 1 Application The 7SJ511 is used as a definite–time or inverse definite minimum time (IDMT) overcurrent protection in medium–volt- age distribution systems with single–end infeed. It is also used as back–up for dif- ferential protection schemes applied to lines, transformers and generators. Construction Within its compact design, the unit con- tains: All components for analog value ac- quisition and numeric evaluation Operating panel Indication and command outputs Binary inputs Serial interfaces for parameterization and connection to substation control and protection Auxiliary voltage converter. The device can be provided in two hous- ings. The model for panel surface mount- ing is equipped with terminals accessible from the front. The options for flush mounting have rear connection terminals and are available with or without glass cover. Implemented functions/features The following functions are available: Definite–time/inverse time overcurrent protection Definite–time/inverse time earth–fault protection Overload protection (with memory) Reverse interlocking (busbar protec- tion scheme) Circuit–breaker failure protection Trip circuit test function Display of on–load measured current values Fault recording. Mode of operation With the use of a powerful micro–control- ler and digital analog value preparation and processing, the effect of high fre- quency transients and transient DC com- ponents is largely eliminated. If definite–time characteristics are used the measuring method involves evalua- tion of the fundamental. If dependent time characteristics are chosen there is a choice between r.m.s value or fundamen- tal calculation. Serial interfaces The device is equipped with two serial interfaces. A PC can be connected to the front port to ease setup of the relay using DIGSI. This program, which runs under MS– WINDOWS, can also be used to evaluate up to 8 oscillographic fault records, 8 fault logs and 1 event log containing up 30 events. The 7SJ511 can be hooked up to a substation automation system. The sys- tem interface for linking to the SINAUT LSA substation control and protection system or a protection master unit uses the protocol IEC 870–5–103 (standard of the Association of German Power Utili- ties, VDEW/ZVEI recommendation). The connection can be either via an 820 nm fibre optics interface or an electrical RS232C interface. Self monitoring Hardware and software are constantly monitored and irregularities immediately detected and signalled. In this way a very high degree of safety, reliability and avail- ability is achieved. 7SJ511 Numerical overcurrent–time protection relay (Version V3) Fig. 1 7SJ511 numerical overcurrent–time protection relay 49 50 50N 51 51N Scope of functions 50BF Siemens AG 1997
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The 7SJ511 is used as a definite–time orinverse definite minimum time (IDMT)overcurrent protection in medium–volt-age distribution systems with single–endinfeed. It is also used as back–up for dif-
ferential protection schemes applied tolines, transformers and generators.
Construction
Within its compact design, the unit con-tains: All components for analog value ac-
quisition and numeric evaluation Operating panel Indication and command outputs
Binary inputs Serial interfaces for parameterization
and connection to substation controland protection
Auxiliary voltage converter.The device can be provided in two hous-ings. The model for panel surface mount-ing is equipped with terminals accessiblefrom the front. The options for flushmounting have rear connection terminalsand are available with or without glasscover.
Implemented functions/features
The following functions are available: Definite–time/inverse time overcurrent
protection Definite–time/inverse time earth–fault
protection Overload protection (with memory)
Reverse interlocking (busbar protec-tion scheme)
Circuit–breaker failure protection Trip circuit test function Display of on–load measured current
values Fault recording.
Mode of operation
With the use of a powerful micro–control-ler and digital analog value preparationand processing, the effect of high fre-
quency transients and transient DC com-ponents is largely eliminated.If definite–time characteristics are usedthe measuring method involves evalua-tion of the fundamental. If dependenttime characteristics are chosen there is achoice between r.m.s value or fundamen-tal calculation.
Serial interfaces
The device is equipped with two serialinterfaces.
A PC can be connected to the front portto ease setup of the relay using DIGSI.This program, which runs under MS–
WINDOWS, can also be used to evaluateup to 8 oscillographic fault records, 8fault logs and 1 event log containing up30 events.
The 7SJ511 can be hooked up to asubstation automation system. The sys-tem interface for linking to the SINAUTLSA substation control and protectionsystem or a protection master unit usesthe protocol IEC 870–5–103 (standard ofthe Association of German Power Utili-ties, VDEW/ZVEI recommendation). Theconnection can be either via an 820 nmfibre optics interface or an electricalRS232C interface.
Self monitoring
Hardware and software are constantlymonitored and irregularities immediatelydetected and signalled. In this way a veryhigh degree of safety, reliability and avail-ability is achieved.
The menu driven HMI or connected OC isused for setting parameters. The parame-ters are stored in a non–volatile memoryso that the setting is retained even if thesupply voltage is cut off.
Oscillographic fault recording of up to8 records (5 seconds maximum)
The ”Fault recording” function is used torecord the phase currents in the event ofa power system fault. Either pickup, trip-ping or binary input can be selected totrigger waveform capture. The maximumlength of a record can be programmed.The recorded traces of the phase andground currents and pickup and drop–offof internal events can be transmitted to aPC for convenient analysis using DIGRA.
The function is based on phase–selectivemeasurement of the three phase cur-rents and the earth current. Either defi-nite–time or inverse–time maximum cur-rent time protection can be used. Inaddition to the overcurrent stage there isa high current state both for the phases( >, >>) and for the earth ( E>, E>>).
The high current stage always has defi-nite–time characteristics:
If the 11th place of the order number is 0(country–specific presettings: German/ English), the following tripping character-istics can be selected (to BS 142, orIEC 255–4): normal inverse (Fig. 4)
The following inverse–time characteris-tics have been adapted to the require-ments of the US market.The US–version has a ”1” in the 11thplace of the order number.
t A( p)N –1
B D
t tripping time p current settingA, B, N parameters
–Squared–T Curve (Fig. 7)
t 50.7 D 10.14( p)2
t tripping time
p current settingD time dial setting
Fig. 7Tripping time characteristic, –squared–T curve
t [s]
/ p
70
50
20
1075
2
10.70.5
0.2
0.1
0.070.05
0.02
0.011 2 3 5 7 10 20
D = 1.6
D = 0.5
D = 0.2D = 0.1D = 0.05
D = 1
100
D = 3.2
D = 5
D = 7
D = 10
Fig. 8Tripping time characteristic, inverse
t [s]
/ p
7050
20
1075
2
10.70.5
0.2
0.10.070.05
0.02
0.011 2 3 5 7 10 20
D = 1.6
D = 0.5
D = 0.2
D = 0.1
D = 0.05
D = 1
100
D = 3.2
D = 5
D = 7D = 10
Fig. 9Tripping time characteristic, moderately inverse
For protection against high–resistanceearth–faults in earthed networks, it ispossible to monitor the earth current viaan independent fourth input current trans-former. As for the phase current protec-tion, a choice may be made between thedefinite–time and the IDMT overcurrentcharacteristics, both having definite–timehigh–set overcurrent characteristic.
Intermittend (re–striking) faults occur dueto insulation weaknesses in cables or asa result of water penetrating cable joints.Such faults either simply cease at some
stage 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.
Reverse interlockingBlocking of any stage (e.g. >>) is pos-sible via a binary input. Thus, the numeri-cal overcurrent protection 7SJ511 can beused as a fast busbar protection in wyeconnected networks or in open ring net-works (ring open at one location), usingthe reverse interlock principle. This canbe used in medium–voltage systems, inpower station auxiliary supplement net-works, etc., in which cases a transformerfeeds from a higher–voltage system ontoa busbar with several outgoing feeders.
Thermal overload protection
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 digitalinput by an external protection, thebreaker failure current check function isinitiated.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) is energized.
Inrush stabilization
When switching on a transformer the7SJ511 can distinguish between inrushand real short–circuits. Inrush is particu-larly noticeable by its relatively high se-cond harmonic content. In the case of a
short–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.
Fault recording
The digitized analog values of phase cur-rents and earth current are stored in theevent of a fault. The analog values re-corded can be transferred to a PC where
they can be displayed, analyzed and ar-chived using DIGSI. As an option theycan be read out by the SINAUT LSAsubstation control and protection system.
The serial interface conforms to VDEW/ ZVEI. Up to eight fault recordings can bestored. The fault recording buffer is a cir-culating buffer with a maximum length sothat when it is full every new networkfault overwrites the oldest recorded fault.A total of 5 seconds are available for therecording duration.
Indications
The 7SJ511 supplies detailed data foranalyzing faults and checking states dur-ing operation. All the following indicationsare protected against supply voltage fail-ure, in case there is a battery–backedclock. Time
Time can be synchronized via a binaryinput or the serial interface. The dateand time are assigned to all indica-tions.
Fault indicationsThe indications of the faults in the de-vice are available with a resolution of1 ms.
Operational indicationsAll indications that do not immediatelyrefer to a fault (e.g. operating orswitching actions) are stored in the op-erational indication buffer (resolution1 ms).
Circuit–breaker trip circuit test func-tion
The integrity of the circuit–breaker tripcircuit can be tested via an operator initi-ated trip command. This test can be initi-ated via the front panel keyboard or oper-ator serial interface, but only after inputof a code word.
Marshalling of command and alarm/event relays, LEDs and binary inputs
All input/output relays and indicatingLEDs may be functionally allocated ac-cording to the user‘s requirements.Several indications can be assigned toone output relay, LED or binary input si-multaneously. In this case they are
ORed.Measuring, monitoring and testingfunctions
The following functions are available forcommissioning, operational measure-ment and monitoring: Measuring of currents: L1, L2, L3, E
Thermal overload capability in current pathcontinuous1 s
Dynamic overload capability (half cycle)
Burden
of current inputs at N = 1 Aat N = 5 A
1 or 5 A50 or 60 Hz
4 x N100 x N
250 x N
approx 0.1 VAapprox. 0.2 VA
Voltage supplyvia integrated DC/DC converter
Rated auxiliary voltage V aux /permissible ranges
Max. ripple at rated voltage
Power consumption, quiescentenergized
Max. bridging time during loss of voltage supply
24, 48 V DC or / 19 to 56 V DC60, 110, 125 V DC or /48 to 144 V DC220, 250 V DC or /176 to 288 V DC
12 %
approx. 5 Wapprox. 10 W
50 ms at V aux 110 V DC
Binary inputs Number
Voltage range
Current consumption independent of operating voltage
2 (marshallable)
24 to 250 V DC
approx. 2.5 mA
Alarm/event contacts Number of relays, each having 1 C/O contact
Switching capacity make/break
Switching voltage
Permissible current, continuous
5 (marshallable)
20 W/VA
250 V AC/DC
1 A
Command contacts Number of relays, each having 2 NO contacts
Switching capacity makebreak
Switching voltage
Permissible current, continuous0.5 s
2 (marshallable)
1000 W/VA30 W/VA
250 V AC/DC
5 A30 A
LED displays Ready indication greenBlocked indication red
Marshallable LEDs red
11
6
Serial interfaces Operator interface
Connection
Potential free system interfacefor data transmission to control center
Standard
Baud rate
Transmission reliability
Connection, direct on flush–mounted housingon surface–mounted housing
distancetest voltage
Connection fibre optic cable
optical wavelengthpermissible attenuationdistanceno character
not isolated
on front panel, 25–pole subminiature plugISO 2110 for the connection of a PC
isolated
similar to V.24/V.28 (RS232C)according to EIA, DIN 19 244
9600 Bd setting as supplied;min. 4800 Bd, max. 19200 Bd
hamming distance d = 4
at rear, 4–pole module connectorat two–tier terminal at the top and bottomof the housing
cable with 2 core pairs, with individual andcommon screening:e.g. LIYCY–CY/2 x 2 x o.25 mm2
max. 1 km2 kV with rated frequency for 1 min
integrated FSMA connectors for FOconnectionon flush–mounted housing: at rearon surface–mounted housing: at thebottom of housing820 nmmax. 8 dB with glassfibre 62.5/125 mmax. 2 kmswitchable; setting as supplied ”light off”
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 303
High voltage test (routine test), except d.c. voltage supply input
High voltage test (routine test), only d.c. voltage supply input
Impulse voltage test (type test), all circuits, class III
2 kV (rms), 50 Hz
2.8 kV DC
5 kV (peak), 1.2/50 s, 0.5 J,3 positive and 3 negative shots at intervalsof 5s
p / N = 0.1 to 4 p / N = 0.1 to 4 / N = 0.1 to 25 / N = 0.1 to 25
0,05 to 3,2 s
1.1 x p
normal inverse, very inverse, extremelyinverse p: 0.1 to 4, D: 0 to 10s
25 x N
5 %5 % for 2( / p>)20 and t p = 1<30 ms
Selection and ordering data
Order No.7SJ511 numercial overcurrent–time protection relay 7SJ511 – A –
Rated current at 50/60 Hz AC1 A5 A
15
Auxiliary voltage for converter24/48 V DC60/110/125 V DC220/250 V DC
245
Design structure7XP2030–1 housing for switchboard mounting7XP2030–2 housing for switchboard/cubicle mounting with Weidmüller terminals7XP2030–2 housing for switchboard/cubicle mounting with Weidmüller terminals without glass cover
Real–time clock non–volat ile alarm memory software generationWithout without version V 2.1xWith with version V2.1xWithout without version V3With with version V3
0123
Scope of functionwithout intermittend earth–fault protectionwith intermittend earth–fault protection
02
Serial system interfaceWithoutWith isolated RS 232C (V.24) interface (wire–connected)With integrated fibre–optic connection
ABC
Operating program DIGSI (other languages on request)
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
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 andweights are subject to change unlessotherwise stated on the individual pagesof this catalog.
The illustrations are for reference only.
We reserve the right to adjust the pricesand shall charge the price applying onthe date of delivery.
Export 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.
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Responsible for
Technical contents: Hans Heining–Triebs,Siemens AG, EV S V 13, 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
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BereichEnergieübertragung und -verteilungGeschäftsgebiet SekundärsystemeP. O. Box 48 06D-90026 Nürnberg
Order No.: E50001-K5712–A131-A2–7600Printed in GermanyKG K 0397 6 0 SC 12 E 321525 6106/U497