2 Functions
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7SD5 Manual
C53000-G1176-C169-1
sive overreach transfer scheme even in this case, the device contains a special func-
tion. The „weak-infeed function“ (echo function) is activated when a signal is received
from the opposite line end — in the case of three terminal lines from at least one of the
opposite line ends — without the device having detected a fault.
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 2-75 Logic diagram of the directional comparison scheme (one line end)
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