Figure 251: Remote Control Of Circuit Breaker; Cb Healthy Check - GE MiCOM P40 Agile Technical Manual

Single breaker current differential (with distance)

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Chapter 17 - Monitoring and Control

Protection Trip

Figure 251: Remote Control of Circuit Breaker

A CB Healthy check is available if required. This facility accepts an input to one of the opto-inputs to indicate that

the breaker 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.

SYNCHRONISATION CHECK

Where the check synchronism function is set, this can be enabled to supervise manual circuit breaker Close

commands. A circuit 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.

CB CONTROL AR IMPLICATIONS

An Auto 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

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

P54x1i-TM-EN-1

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