Siemens siprotec 7SD5

2 Functions
178
7SD5 Manual
C53000-G1176-C169-1
If at one line end there is weak or zero infeed, so that the distance protection does not
pick up, the circuit breaker can still be tripped. This „Weak-infeed tripping“ is referred
to in Section 2.10.1.
Figure 2-68 Logic diagram of the permissive underreach transfer trip (PUTT) with pickup (one line end)
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