Switchgear and Protection.pdf

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The sequence of operation during abnormal condition:
Fault Occurs

Relay sense the fault and
close the trip circuit

Energize the trip coil &
unlatch the spring

Contact starts to apart and
arc is drawn between the
contacts of CB

Arc is extinguished at the
instant when fault ac current

Fault interruption is
completed so fault is cleared

Trip Circuit:

Switchgear and protection

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