Siemens siprotec 7SD5 User Manual page 238

2 Functions
The circuit breaker can also be tripped at the line end with no or only weak infeed. This
„Weak-infeed tripping" is referred to in Section 2.10.1.
Figure 2-103 Logic diagram of the unblocking scheme (one line end)
238
7SD5 Manual
C53000-G1176-C169-1