E01207
Protection
Trip
Remote
Control
Trip
Remote
Control
Close
Trip
Trip
Close
Close
Local
Remote
Figure 132: Remote Control of Circuit Breaker
7.6 CB HEALTHY CHECK
A CB Healthy check is available if required. This facility accepts an input to one of the opto-inputs to indicate that
the br
eaker is capable of closing (e.g. that it is fully charged). A time delay can be set with the setting CB Healthy
Time. If the CB does not indicate a healthy condition within the time period following a Close command, the device
will lockout and alarm.
7.7 SYNCHRONISATION CHECK
Where the check synchronism function is set, this can be enabled to supervise manual circuit breaker Close
commands. A cir
cuit breaker Close command will only be issued if the Check Synchronisation criteria are satisfied.
A time delay can be set with the setting Sys Check time. If the Check Synchronisation criteria are not satisfied
within the time period following a Close command the device will lockout and alarm.
7.8 CB CONTROL AR IMPLICATIONS
An A
uto Close CB signal from the Auto-close logic bypasses the Man Close Delay time, and the CB Close output
operates immediately to close the circuit breaker.
If Autoreclose is used it may be desirable to block its operation when performing a manual close. In general, the
majority of faults following a manual closure are permanent faults and it is undesirable to allow automatic
reclosure.
To ensure that Autoreclose is not initiated for a manual circuit breaker closure on to a pre-existing fault, the CB IS
Time (circuit breaker in service time) setting in the AUTORECLOSE menu should be set for the desired time window.
This setting ensures that Autoreclose initiation is inhibited for a period equal to setting CB IS Time following a
manual circuit breaker closure. If a protection operation occurs during the inhibit period, Autoreclose is not
initiated.
Chapter 12 - Monitoring and Control P54A/B/C/E
264 P54xMED-TM-EN-1
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