Investigation of Mechanism of Breakdown in XLPE Cables.

摘要

The research program explores the basic hypothesis that microporosity plays a significant role in the mechanism of breakdown of XLPE cable. In Part I,the potential improvement achieved by impregnating the microporous regions of the cable core with a neutral liquid is evaluated,with relation to AC voltage life and impulse strength. The effect at higher frequency is also demonstrated. In Part II, a similar test program is pursued on model cables,designed to explore the effects of gas-pressure and gas type on breakdown and life,since it is reasonable to expect that only the microporous regions of the insulation should be sensitive to the gas-pressure environment.