Technical Data
4.6 Distance Protection (optional)
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
595
Times
Emergency operation
Shortest trip time Approx. 17 ms (50 Hz) /15 ms (60 Hz) with fast relay and
Approx. 12 ms (50 Hz) /10 ms (60 Hz) with high-speed relay
Dropout time Approx. 30 ms
Stage timers 0.00 s to 30.00 s; ∞
for all zones; separate time setting pos-
sibilities for single-phase and multi-
phase faults for the zones Z1, Z2, and
Z1B
Increments 0.01 s
Time expiry tolerances 1 % of setting value or 10 ms
The set times are pure delay times with definite time protection.
If the differential protection and the distance protection operate in parallel in the protective relay, emergency operation will
not be activated unless both protection functions have become ineffective.
In case of measured voltage failure, e.g. voltage transformer mcb trip see Section 4.16 „Time Overcurrent Protection“
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