Answer / vishreddy205

for the protection of breaker when
breaker doesn't operate for
abnormalities then main breaker act
as a backup protection

Answer / 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.

Answer / shailesh

The main function of LBB to get protection (To trip breaker)
when main breaker not trip due any reasons.

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