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List the properties of line insulators in brief

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Following are the properties of line insulators: 

A) Electrical Properties of insulating material:-

1. It should have high resistance.

2. It should have high breakdown voltage.

3. It should have high dielectric strength.

4. It should have low dielectric loss.

5. It should have low dielectric constant.

B) Mechanical Properties of insulating material:-

1) It should have high mechanical strength.

2) It should be tough and flexible.

3) It should be light in weight.

4) It should not be porous otherwise it increases moisture holding capacity which

reduces insulating property.

C) Chemical Properties of insulating material:-

1. It should not be hygroscopic (which absorbs moisture).

2. It should have high resistance to acid & alkaline (Chemicals).

3. It should have high resistance to oil.

D) Thermal Properties of insulating material:-

1. It should have high thermal conductivity.

2. It should be non -inflammable.

3. It should withstand at high temperature.

4. It should have thermal Stability.

5. Co-efficient of thermal expansion should be low.

E) General Properties of insulating material:-

1. It should have longer life.

2. It should have low cost
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