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Question

What is the type of insulator used at dead ends and on straight lines as suspension type for voltages 3.3 kV and above? 

A.

Disc insulators 

B.

Stay insulators 

C.

Strain insulators 

D.

Pin insulators

Answer ( Option A)

Disc insulators 

Solution

Disc insulators, made of tough glass or glazed forcelain are used as insulators at dead ends or on suspension type lines of voltage 3.3 kV and above.

These  are mainly of four types :

1. Balls the socket types

2. Insulated for cold climate

3. Insulated for polluted atmosphere

4. Tongue and clevis type

Hence, the correct option is (A).

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