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Breakers

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The Servicing of breakers {OCB, VCB, ACB} are essential to be carried out once in a year as the large number of contacts breaking takes place inside them. Besides the restore its healthiness by checking the Tripping & Closing Time, Insulation Resistance, Polarization index and  Contact Resistance and replacement of worn parts.

Tripping & Closing Time

Insulation Resistance

It is desirable to have Insulation Resistance as high as possible consistent with acceptable mechanical, chemical and heat resisting properties. This test is to detect the conductive impurities or mechanical imperfections in the dielectric which affect the quality of insulation.

The insulation resistance test can detect if this connection is loose. It can also detect whether there are other, undesired and inadvertent, grounds. If the intentional core ground is intact, the resultant resistance should be very low. To check for unintentional core grounds, remove the intentional ground and Megger between the core and the grounded transformer tank. This test should produce very high resistance indicating that an unintentional ground is not present.

Polarization index

Polarization Index test that it can provide an indication of insulation quality in ten minutes for very large equipment that might take very long time to get fully charged.

Contact Resistance