For low voltage power transmission applications, a PIN type insulator is useful. However, when the voltage exceeds 33 kV, Suspension type insulators are recommended.

How Suspension Insulator Looks

The suspension type insulator comprises of number of porcelain discs that are connected in series by metal links forming a string.

Suspension Type Insulator

How Suspension Type Insulator is connected

The transmission line conductor is suspended at the bottom end of the suspension insulator string while the top (upper) end of the insulator is secured to the cross-arm of the tower.

Also learn the components of Transmission lines or download book on transmission lines

The figure below displays how it connects:

Suspension type insulators are commonly available in both forms:

  1. Porcelain type suspension insulators
  2. Glass type suspension insulators

Practical Applications

Practically suspension insulators are useful for voltage values above 33 kV.