Check CB Anti Pumping Function / Trip Free Function

Check CB Anti Pumping Function / Trip Free Function {at local and

remote position) and (at test and service position)}

Step 1: Ensure Gas, Air and DC Supply is normal for the CB under test.

Step 2: Close the Breaker Electrically and Hold the Control Switch in

‘CLOSE’ position.

Step 3: Trip the Breaker by externally extending the DC Supply to Trip

Circuit. (Not by any trip relays which is used for close interlock)

Step 4: Observe the Breaker to ‘TRIP’ and remain in ‘OPEN’ position &

Does not close.

Step 5: Thus Anti Pumping function found working with the above

Sequence.