Study on Surface Degradation of Polymer Insulating
Materials caused by Leakage Current
(1994)Abstract
Some artificial aging tests were perfonned using test rods made
of Silicone Rubber (SR) and Ethylene Propylene Rubber (EPDM)~ based
on the Rotating Wheel Dip Test (R WDT) method and the Salt Fog Chamber
Test (SFCIj method~ and ISpects of the surface degradation were evaluated.
Following the tests, it wu concluded that the surface degradation of polymer
insulating materials are directly related to the partial discharge and
measurement of the cumulative charge of the leakage CUrTent is useful in
evaluating the degradation. Moreover, an energized exposure test using
prototype composite insulators was carried out for five years. Then, the
accelerating factor from the artificial aging test for actual use was estimated,
comparing the amounts of cumulative charge i"n the artificial aging test
and in the exposure test
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