Siemens SIPROTEC 7SJ80

Automatic Reclosing 79
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Single-shot or multi-shot
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With separate dead times for the first and all succeeding shots
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Protective elements that initiate automatic reclosing are selectable. The choices can be different for
phase faults and ground faults
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Separate programs for phase and ground faults
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Interaction to time overcurrent protection element and ground fault elements. They can be blocked in
dependence of the reclosing cycle or released instantaneously
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Synchronous reconnection is possible .
Fault Location
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Initiation by trip command, external command or dropout of pickup
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Calculation of the fault distance and output of the fault location in ohms (primary and secondary) and in
kilometers or miles
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Up to three line sections can be configured.
Breaker Failure Protection 50 BF
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By checking the current and/or evaluating the circuit breaker auxiliary contacts
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Started by any integrated protection function that trips
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Initiation possible via a binary input from an external protective device.
Flexible Protective Functions
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Up to 20 customizable protection functions with three-phase or single-phase operation
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Any calculated or directly measured quantity can be evaluated on principle
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Standard protection logic with definite time characteristic
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Internal and configurable pickup and dropout delay
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Modifiable message texts.
Synchrocheck
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Verification of the synchronous conditions before reclosing after three-pole tripping
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Fast measurement of the voltage difference ΔV, the phase angle difference Δϕ and the frequency differ-
ence Δf
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Alternatively, check of the de-energized state before reclosing
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Setable minimum and maximum voltage
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Verification of the synchronous conditions or de-energized state also possible before the manual closing
of the circuit breaker, with separate limit values
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Measurement also possible via transformer without external intermediate matching transformer
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Measuring voltages optionally phase–to–phase or phase–to–ground.
Phase Rotation
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Selectable ABC or ACB by setting (static) or binary input (dynamic).
Introduction
1.3 Characteristics
SIPROTEC 4, 7SJ80, Manual 27
E50417-G1140-C343-A8, Edition 12.2017