SOLUTION

Suspension Type Insulator

• With an increase in the line voltage (above 33 kV) the pin insulator becomes heavy and complicated.
• Suspension type Insulator consists of a Number of porcelain discs connected in series with the metallic links to form a chain and the line conductor is carried by the bottom-most insulator.

Advantages of Suspension Type Insulator

1. Each disc is designed for low voltage i.e for 11 kV. Therefore by connecting the number of an individual disc in series, the insulator can be designed for any system voltage. For e.g 33 kV working voltage will require 3 individual discs.
2. Mechanical stress on the string is very low.
3. Line conductors are less affected by lightning.
4. If anyone of the insulators fails it can be replaced easily and at a very low cost.
5. It is more economical than pin type insulator for high operating voltage.