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Answer Posted / hardip dodiya
For Protection of Breaker and protection of EHV Bus-bar in
EHV and HV switchyard. all S/s breaker have one NO/NC
Contact connected to Bus-bar control panel in which. at
time of fault, Breaker Stuck up due to Mechanisam prob or
failure of Trip coil or any mechanical damage problem.
After it TIME-Delay time almost 200ms. busbar control
panels sense this abnormality and give command to all
breaker to trip which is connceted to EHV Bus-bar.
Protect the S/s Equipment.
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