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
ȱ

Fault interruption is
completed so fault is cleared

Trip Circuit:

Switchgear and protection

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