Functions
6-100 7SA6 Manual
C53000-G1176-C156-2
On feeders with single-end infeed, the line end with no infeed cannot generate a re-
lease signal, as no fault detection occurs there. To achieve tripping by the permissive
overreach transfer scheme even in this case, the device contains a special function.
This “Weak Infeed Function” (echo function) is referred to in Sub-section 6.6.1.11. It
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 that has only weak or no infeed.
This “Weak-Infeed Tripping” is referred to in Section 6.9.
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