Overcurrent Protection / 7SJ45

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1 Overcurrent Protection / SJ SIPROTEC easy SJ numerical overcurrent protection relay powered by CTs Fig. / Description SIPROTEC easy SJ numerical overcurrent protection relay powered by current transformers (CT) The SIPROTEC easy SJ is a numerical overcurrent protection relay which is primarily intended as a radial feeder or transformer protection (backup) in electrical networks. It provides definite-time and inverse-time overcurrent protection according to IEC and ANSI standards. The SJ relay does not require auxiliary voltage supply. It imports its power supply from the current transformers. LSP-afp.tif Function overview Operation without auxiliary voltage via integrated CT power supply Standard current transformers ( A / A) Low power consumption:. VA at I N (of the relay) Easy mounting due to compact housing Easy connection via screw-type terminals Protection functions -stage overcurrent protection Definite-time and inverse-time characteristics (IEC/ANSI) High-current stage I>> or calculated ground-current stage I E > or I Ep > selectable Trip with pulse output (DC V / 0. Ws) or relay output (changeover contact) Repetition of trip during circuit-breaker failure (relays with pulse output) Combination with electromechanical relays is possible due to the emulation algorithm Monitoring functions Hardware and software are continuously monitored during operation Front design Simple setting via DIP switches (self-explaining) Settings can be executed without auxiliary voltage no PC Integrated mechanical trip indication optionally Additional features Optional version available for most adverse environmental conditions (condensation permissible) Flush mounting or surface (rail) mounting 0 Siemens SIP Edition No. /

2 Overcurrent Protection / SJ Application, construction Application The SIPROTEC easy SJ is a numerical overcurrent protection relay which is primarily intended as a radial feeder or transformer protection (backup) in electrical networks. It provides definite-time and inverse-time overcurrent protection according to IEC and ANSI standards. The convenient setting with DIP switches is self-explanatory and simple. The SJ relay does not require auxiliary voltage supply. It imports its power supply (. VA at I N, sum of all phases) from the current transformers. Impulse output for low-energy trip release or contact output for additional auxiliary transformer are available. An optional integrated trip indication shows that a trip occurred. Fig. / Typical application ANSI IEC Protection functions 0 I>> Instantaneous overcurrent protection 0, I>t, I p Overcurrent protection (phase) 0N, N I E >t, I Ep Overcurrent protection (ground) Construction 0 Within its compact housing the protection relay contains all required components for: Measuring and processing Alarm and command output Operation and indication (without a PC) Optional mechanical trip indication Auxiliary supply from current transformers Maintenance not necessary The housing dimensions of the units are such that the SJ relays can in general be installed into the existing cutouts in cubicles. Alternative constructions are available (surface mounting and flush mounting). The compact housing permits easy mounting, and a version for the most adverse environmental conditions, even with extreme humidity, is also available. Fig. / Application in distribution switchgear LSP0-afp.tif LSP-afp.tif Fig. / Screw-type terminals / Siemens SIP Edition No.

3 Overcurrent Protection / SJ Protection functions Protection functions The overcurrent function is based on phase-selective measurement of the three phase currents. The earth (ground) current I E (Gnd) is calculated from the three line currents I L (A), I L (B), and I L (C). The relay has always a normal stage for phase currents I> (0/). For the second stage, the user can choose between a high-current stage for phase currents I>> (0) or a normal stage for calculated ground currents I E > (0N/N). The inverse-time overcurrent protection with integrating measurement method (disk emulation) emulates the behaviour of electromechanical relays. The influence of high-frequency transients and transient DC components is largely suppressed by the implementation of numerical measured-value processing. Fig. / Definite-time overcurrent characteristic 0 Fig. / Inverse-time overcurrent characteristic Available inverse-time characteristics Characteristics acc. to ANSI/IEEE IEC 0- Moderately inverse/normal inverse Very inverse Extremely inverse Siemens SIP Edition No. /

4 Overcurrent Protection / SJ Connection diagrams Connection diagrams Pulse output or relay output are optionally available. Pulse output These relays require a low-energy trip release (DC V / 0. Ws) in the circuitbreaker, and are intended for modern switchgear. In case of circuit-breaker failure, a repetition of the tripping signal is initiated. Fig. / Connection of CTs with pulse output Fig. / Connection diagram SJ with impulse output 0 Relay output These relays can be applied with all conventional switchgear. A transformer that provides the trip circuit energy, must be connected in the current transformer circuit. Fig. / Connection of CTs with trigger transformer and relay output Fig. /0 Connection diagram SJ with relay output / Siemens SIP Edition No.

5 Overcurrent Protection / SJ Technical data General unit data Analog input System frequency f N Current transformer inputs Rated current, normal ground current I N Power consumption At I N = / A Rating of current transformer circuit Thermal (r.m.s.) Dynamic (peak) Recommended primary current transformers Output relays Pulse output (SJXX-0*) Number Relay output (SJXX-*) Number Contact rating Rated contact voltage Permissible current per contact Unit design Housing 0 or 0 Hz (selectable) or A Approx.. VA at I N (relay) 0 I N for s I N for 0 s I N continuous 00 I N for half a cycle 0 P 0,. VA or according to the requirements and required tripping power pulse output DC V / 0. Ws changeover contact Make 000 W/VA Break 0 VA 0 W resistive VA at L/R 0 ms DC 0 V or AC 0 V A continuous 0 A for 0. s (inrush current) Flush mounting DIN 00/ IEC Adaptable for rail mounting (recommended for local mounting only) Dimensions (WxHxD) in mm. x x 0. (incl. transparent cover and terminal blocks) Weight (mass) approx.. kg Degree of protection according to IEC 0 Housing Front Rear Protection of personnel U L -listing Listed under CA. Electrical tests Specifications Standards IP IP 0 IPX IEC 0 (product standards) ANSI C.0.0/./.; UL0 See also standards for individual tests Insulation tests Standards IEC 0- Voltage test (routine test). kv (r.m.s.), 0 Hz, min All circuits except for pulse output-ground Voltage test (type test) across open command contacts.0 kv (r.m.s.), 0 Hz, min Impulse voltage test (type test) all circuits, class III kv (peak);./0 µs; 0. J; positive and negative impulses in intervals of s EMC tests for interference immunity; type tests Standards IEC 0-, IEC 0-, EN 0 (product standards) EN 00- (generic standard) EN IEC 000- (basic standards) High-frequency test IEC 0--, class III Electrostatic discharge IEC 0--, class III EN 000--, class III Irradiation with radio-frequency field, amplitude-modulated IEC 0-- and IEC 000--, class III Irradiation with radio-frequency field, pulse-modulated IEC 000--/ENV 00, class III Fast transient interference/bursts IEC 0-- and IEC 000--, class IV High-energy surge voltage, IEC installation, class III Measuring inputs, binary outputs Line-conducted HF, amplitude-modulated, IEC 0-- and IEC 000--, class III Power frequency magnetic field IEC 000--, class IV IEC 0- Damped wave IEC 0, IEC 000--, class III Oscillatory surge withstand capability ANSI/IEEE C.0. Not across open contacts Fast transient surge withstand capability ANSI/IEEE C.0. not across open contacts Radiated electromagnetic interference ANSI/IEEE C.0.. kv (peak); MHz; τ = ms; R i = 00 Ω; 00 surges/s; duration s kv/ kv contact discharge; kv air discharge; both polarities; 0 pf; = 0 Ω 0 V/m; 0 to 000 MHz; 0 %; khz; AM 0 V/m; 00 MHz; repetition frequency 00 Hz; duty cycle 0 % 0 V/M; 0 MHz; repetition frequency 00 Hz; duty cycle 0 % kv; /0 ns; khz; burst duration = ms; repetition rate 00 ms; both polarities; R i = 0 Ω; duration min Impulse:./0 µs Circuit groups to ground: kv; W, 0. µf Across circuit groups: kv; W, 0. µf 0 V; 0 khz to 0 MHz; 0 %; khz; R i = 0 Ω 0 A/m continuous; 00 A/m for s; 0 Hz 0. mt; 0 Hz. kv (peak, polarity alternating) 00 khz, MHz, 0 MHz and 0 MHz, R i = 00 Ω, duration s. to kv (peak); to. MHz damped wave; 0 shots per s; duration s; R i = 0 Ω to 00 Ω to kv; 0/0 ns; 0 and 0 surges per s; both polarities; duration s; R i = 0 Ω V/m; to 000 MHz amplitude and pulse-modulated EMC tests for interference emission; type test Standard EN 00 * (generic) Interference field strength IEC CISPR 0 to 000 MHz, class B 0 Siemens SIP Edition No. /

6 Overcurrent Protection / SJ Technical data 0 Mechanical stress tests Vibration, shock stress and seismic vibration During operation Standards IEC 0- and IEC 00- Vibration IEC 0--, class II IEC 00-- Shock IEC 0--; class I Seismic vibration IEC 0--; class I IEC 00-- Sinusoidal 0 to 0 Hz ± 0.0 mm amplitude: 0 to 0 Hz; g acceleration Frequency sweep octave/min 0 cycles in perpendicular axes Semi-sinusoidal g acceleration, duration ms, each shocks in both directions of the axes Sinusoidal to Hz: ±.0 mm amplitude (horizontal vector) to Hz: ±.0 mm amplitude (vertical vector) to Hz: g acceleration (horizontal vector) to Hz: 0. g acceleration (vertical vector) Frequency sweep octave/min cycle in perpendicular axes During transport (flush mounting) Standards IEC 0- and IEC 00- Vibration IEC 0--, class IEC 00-- Shock IEC 0--, class IEC 00-- Continuous shock IEC 0--, class IEC 00-- Sinusoidal Hz to Hz: ±. mm amplitude; Hz to 0 Hz: g acceleration frequency sweep octave/min 0 cycles in perpendicular axes Semi-sinusoidal g acceleration, duration ms, each shocks in both directions of the axes Semi-sinusoidal 0 g acceleration, duration ms, each 000 shocks in both directions of the axes Climatic stress tests Temperatures Temperatures during service 0 C to +0 C / F to + F With continuous current I N : 0 C to + C / F to + F Permissible temperature during C to + C / F to + F storage Permissible temperature during C to + C / F to + F transport Humidity Permissible humidity class (standard) Permissible humidity class (condensation proof) Annual mean value % relative humidity; on 0 days per year up to % relative humidity; condensation not permissible. Condensation is permissible according to IEC 0-, class III Functions Overcurrent protection Definite time (DT O/C ANSI 0/) Setting range / steps Current pickup I>> (phases) Current pickup I> (phases) -phase supply: see note* Current pickup I E > -phase supply: see note* Delay times T I >> Delay times T I > The set time delays are pure delay times. Inverse time (IEC or ANSI ) Setting range / steps Current pickup I p (phases) -phase supply: see note* Current pickup I Ep > (ground calculated) -phase supply: see note* Delay times T Ip (IEC) Delay times D (ANSI) Trip times Total time delay impulse output Total time delay relay output Reset ratio Tolerances Definite time (DT O/C 0/) Current pickup I>>, I>, I E > Delay times T Inverse time (IEC or ANSI ) Pickup thresholds Time behavior for I/I p 0 I N to 0 I N or deactivated, step 0. I N 0. I N to. I N or deactivated, step 0. I N 0. I N to. I N or deactivated, step 0. I N 0 to ms, step ms 0 to 00 ms, step 00 ms 0. I N to I N or deactivated, step 0. I N 0. I N to I N or deactivated, step 0. I N 0.0 to. s, step 0.0 s 0. to.00 s, step 0. s Approx. ms Approx. ms Approx. 0. (with definite time) Approx. 0. (with inverse time) % of the set value or % of I N (at threshold < I N ) % or 0 ms % of the set value or % of I N (at threshold < I N ) % or 0 ms Deviation of the measured values as a result of various interferences Frequency in the range of <. % 0. < f/f N <.0 Frequency in the range of < 0 % 0. <f/f N <. Harmonics < % up to 0 % rd and th harmonic DC components < % Temperature in the range of < 0. %/0 K C to 0 C / F to F * Note: The device allows minimum setting values of 0. I N (-phase). With single supply, operation is ensured from 0. I N (SJXX-0*; pulse output) or. I N (SJXX-*; relay output) onwards (printed on the front). / Siemens SIP Edition No.

7 Overcurrent Protection / SJ Selection and ordering data CE conformity This product is in conformity with the Directives of the European Communities on the harmonization of the laws of the Member States relating to electromagnetic compatibility (EMC Council Directive 00/0/EG. previous //EEC). This unit conforms to the international standard IEC 0. The unit has been developed and manufactured for application in an industrial environment according to the EMC standards. This conformity is the result of a test that was performed by Siemens AG in accordance with Article 0 of the Council Directive complying with the generic standards EN 00- and EN 00-. Selection and ordering data Description Order No. SIPROTEC easy SJ numerical overcurrent protection relay powered by CTs SJ AA Current transformer I N A A Trip Pulse output (for further details refer to Accessories ) Relay output (for further details refer to Accessories ) Unit design 0 For rail mounting For panel flush mounting B E Region-specific functions Region World, 0/0 Hz; standard Region World, 0/0 Hz; condensation-proof A B IEC / ANSI IEC ANSI 0 Indication (flag) Without With 0 0 Accessories Protection relay with pulse output Low energy trip release Order No. AX0-B Protection relay with relay output Auxiliary transformers for the trip circuit (0 VA CTs recommended) A A Current transformer-operated trip release 0. A (rated operating current) A (rated operating current) AM0-CB00-0AN AM00-AB00-0AN AX0-A AX0-B Siemens SIP Edition No. /

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