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The purpose of insulator is that it resist the flow of leakage current.Insulators provide proper insulation between line conductor and tower.
Properties of insulator:-
A good insulator must have the following properties.
1-High mechanical strength.
2-High electrical resistance.
3-High relative permitivity.
4-High dielectric strength.
5-To bear maximum wind loading and maximum weight bearing capacity.
6-Insulator must be non porous.
7-High ratio of punctur strength.
Note:Insulators are usually made of porcelain or glass.
Types of Insulator:-
1-Pin type insulator
2-suspension type insulator
3-Strain type insulator
4-shackle type insulator
5-stray type insulator
Pin type Insulator:-
A pin type insulator is the one which can hold the insulator to pin and secure the conductor with the help of pin.
Suspension type Insulator:-
Suspension type insulator consists of many porcelain disc connected in series.It is used where voltages are greater than 33KV.
Strain type Insulator:-
A strain insulator is used to bear the pull of suspended wire or cable.
Shackle type Insulator:-
Shackle type insulator are used as strain type insulator in low voltage distribution lines. These insulators can be mounted vertically or horizontally.
Stray type Insulator:-
Stray type insulators are used in guy wire.
