Operation P54x/EN OP/La4
MiCOM P543, P544, P545 & P546
(OP) 5-163
OP
+ve
Trip
0
Close
Local
Remote
Trip Close
ve
Protection
trip
Remote
control trip
Remote
control close
P0123ENa
Figure 105 Remote control of circuit breaker (P543/P545)
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
be necessary to use the breaker 52A and/or 52B contacts (the different selection options are
given from the ‘CB Status Input’ cell above). If no CB auxiliary contacts are available then
this cell should be set to None. Under these circumstances no CB control (manual or auto)
will be possible.
A circuit breaker close command CB Close will initiate closing of the circuit breaker. The
output contact, however, can be set to operate following a user defined time delay (‘Man
Close Delay’). This is designed to give personnel time to retreat from the circuit breaker
following the close command. This time delay applies to all manual circuit breaker close
commands.
The control close cycle can be cancelled at any time before the output contact operates by
any appropriate trip signal, or by activating DDB (443): Reset Close Delay.
An Auto Close CB signal from the Auto close logic bypasses the Man Close Delay time,
and the CB Close output operate immediately to close the circuit breaker.
The length of the trip or close control pulse can be set via the ‘Trip Pulse Time’ and ‘Close
Pulse Time’ settings respectively. These should be set long enough to ensure the breaker
has completed its open or close cycle before the pulse has elapsed.
Note: The manual trip and close commands are found in the SYSTEM
DATA column and the hotkey menu.
If an attempt to close the breaker is being made, and a protection trip signal is generated,
the protection trip command overrides the close command.
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