Protection Engineering Basics and Schemes Protection Engineering | Seite 250

8.1.1 Operation cycle is like
1. Fault occurs i.e. overcurrent or over voltages etc.
2. ARC Relay senses and send signal
3. Trip coil of circuit breaker energizes
4. Circuit breaker normally closed contact moving apart
5. Arc produced between contacts of circuit breaker
6. When distance between contacts increases ,Arc
quenches due to this elongation of path
7. After certain delay , circuit breaker’s trip coil start to
energize and contact come near to close the circuit
8. Arc produces when contact come close to each
other.
pg. 250