Class 2 (2nd Engineer) MET 📅 Jul 2022

Exam Question

With respect to the High Voltage power systems installation, explain the different types of circuit breaker that are used, comparing them on merits and demerits. Deseribe the theory of arc phenomenon and the mechanism fitted to mitigate the arc.

Reference Answer

Types of Circuit Breakers
1. Vacuum Circuit Breaker (VCB):
In VCBs, the fixed and moving contacts, along with the arc shield, are housed in an arc-interrupting chamber with a high vacuum. The vacuum's excellent dielectric strength allows for very short contact separation and rapid recovery of insulation strength after each interruption .
Merits:

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