Overheating of relay contacts or contact born out is due to slow making and breaking of load circuit contacts, foreign matter on the contact surface, too low contact pressure.
Answer : In order that current should flow without causing excessive heating or voltage drop, the relay contacts should have low contact resistance, be clean and smooth, be of sufficient size and proper shape.
Answer : The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to extinguish the arc.
Answer : The voltage appearing across the contacts after opening of the circuit breaker is called recovery voltage.
Answer : The arcing contacts in a circuit breaker are made of copper tungsten alloy.
Description : Part of the transformer which is most subject to damage from overheating is?
Answer : Part of the transformer which is most subject to damage from overheating is winding insulation.