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Please note that Figure 2-60 shows the complete logic for all connection alternatives. For each particular ap-
plication, only a portion of the inputs is used as described above.
The eight output signals of the circuit breaker position logic can be processed by the individual protective and
supplementary functions. The output signals are blocked if the signals transmitted from the circuit breaker are
not plausible: for example, the circuit breaker cannot be open and closed at the same time. Furthermore, no
current can flow over an open breaker contact.
The evaluation of the measuring quantities is according to the local conditions of the measuring points (see
Section 2.1.5.1 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.
Figure 2-60
Circuit breaker position logic
SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009
Functions
2.8 Function Control
153
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