Erosion test

For many years, erosion test tracking chamber had been proven to be very reliable in providing enough data on expected performance for a particular model insulator under severe contaminated conditions.

suspension insulator

Erosion test:
Tracking chambers can be classified in term of the process of wetting the sample into three groups namely salt-fog chambers, tracking wheel chambers and drizzle chambers. The tracking wheel test method imposes wet and dry cycles on a stressed surface of specimens in order to simulate the formation of dry-band arcing as it is experienced on service. It is designed to evaluate insulator shapes and/or materials for outdoor applications. Surface degradation in outdoor applications of either erosion or tracking takes place only in association with arcing over dry bands, which developed during or immediately after precipitation. The surface damage, erosion, or carbonization results from the heat of the arc, and this damage accumulates until the surface between the electrodes can no longer sustain the applied voltage.
At the end of test, there shall be no significant signs of erosion and tracking. Each individual insulator shall not suffer more than two flashovers provided no damage occurs to the surface of the insulator.

The erosion test has shown that the amplitude and frequency of dry-band discharges on electrical insulation are not dependent on design alone but also dependent on the surface properties of the polymer material used.

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