Na7
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MiCOM P741, P742
FIGURE 27: CB STATE MONITORING FEATURES
3.3 Circuit Breaker Control
The relay includes the following options for control of a single circuit breaker:
Local tripping and closing, via the relay menu
Local tripping and closing, via relay opto-isolated inputs
It is recommended that separate relay output contacts are allocated for remote circuit
breaker control and protection tripping. This enables the control outputs to be selected via a
local/remote selector switch as shown below. Where this feature is not required the same
output contact(s) can be used for both protection and remote tripping.
FIGURE 28: REMOTE CONTROL OF CIRCUIT BREAKER
The following table is taken from the relay menu and shows the available settings and
commands associated with circuit breaker control.
A manual trip will be permitted provided that the circuit breaker is initially closed. Likewise, a
close command can only be issued if the CB is initially open. To confirm these states it will
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