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Note
Binary input „>1p Trip Perm" (No. 381) must be activated to achieve single-pole
tripping. The internal automatic reclosing function may also grant the single-pole per-
mission. The binary input is usually controlled by an external automatic reclosure
device.
The trip delay times of the zones (except for Z1 which is usually always set without
delay) can be bypassed. The grading times are started either via zone pickup or
general pickup of the distance protection function. The undelayed release results from
the line energization logic, which may be externally initiated via the circuit breaker
close signal derived from the circuit breaker control switch or from an internal line en-
ergization detection. Zones Z4 and Z5 may be blocked by external criteria (No. 3617
„>BLOCK Z4-Trip", No. 3618 „>BLOCK Z5-Trip").
Figure 2-55
Tripping logic for the 1st zone
7SD5 Manual
C53000-G1176-C169-1
2.5 Distance Protection
163
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