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The evaluation of the measuring quantities is according to the local conditions of the
measuring points (see Section 2.1.4.1 at margin heading „Circuit Breaker Status").
The phase currents are available as measuring quantities. A flowing current excludes
that the circuit breaker is open (exception: A fault between current transformer and
circuit breaker). If the circuit breaker is closed, it may, however, still occur that no
current is flowing. The decisive setting for the evaluation of the measuring quantities
is PoleOpenCurrent (address 1130) for the presence of the currents.
In 7SD610 the position of the circuit breaker poles detected by the device is also trans-
mitted to the remote end device(s). This way the position of the circuit breaker poles
is also recognized by at all other ends. The high-current switch-on-to-fault protection
(see Section 2.8) makes use of this function.
Figure 2-98
Circuit breaker position logic
7SD610 Manual
C53000-G1176-C145-4
2.16 Function Control and Circuit Breaker Test
225
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