The current zero interruption, in oil and air blast circuit breakers, is achieved by
A)lengthening of the gap
B)cooling and blast effect
C)both (a) and (b)
D)deionizing the oil with forced air

Question

Quizplus · Accepted Answer

The current zero interruption in both oil and air blast circuit breakers is achieved through a combination of lengthening the gap between the contacts (which increases the distance the arc must travel, thus helping to extinguish it) and the cooling and blast effect (which rapidly cools the arc, reducing its temperature below the ionization point, and sweeps away the ionized particles).

The Current Zero Interruption, in Oil and Air Blast Circuit