July 12, 2013

What is an arc? Give the two methods of arc interruption?

Arc is a phenomenon occurring when the two contacts of a circuit breaker separate under heavy load or fault or short circuit condition.

Methods of arc interruption: 
  1. High resistance interruption:-the arc resistance is increased by elongating, and splitting the arc so that the arc is fully extinguished 
  2. Current zero method:-The arc is interrupted at current zero position that occurs 100 times a second in case of 50Hz power system frequency in ac.


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