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Insulator mechanical failure

For ensuring insulator performance and quality, we should do insulator tests, that arefor avoiding unwanted Insulator failure, such as Insulator mechanical failure and electrical failure.

Insulator mechanical failure

Before going through testing of insulator we will try to understand different causes of insulator failure. Because insulator testing ensures the quality of electrical insulator and chances for failure of insulation depend upon the quality of insulator.

What does cause the insulator mechanical failure?
There are different causes due to which failure of insulation in electrical power system may occur, or some heavy factors.

Usually mechanical stresses affect the insulator mechanical performance. For example
If an insulator has any weak portion due to manufacturing defect, it may break from that weak portion when mechanical stress is applied on it by its conductor. These are the main causes of insulator failure. Now we will discuss the different insulator test procedures to ensure minimum chance of failure of insulation.

The main mechanical tests include
◆ Specified cantilever strength test
◆ Bending strength test
◆ Torsion strength test
◆ Compression strength test

For disc insulator, the strain strength is important, we should do some test about insulator string mechanical property.

To ensure the desired mechanical performance of an electrical insulator, that is for avoiding unwanted insulator mechanical failure.


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