Abstract

Firstly, possibilities on the improvement of breakdown characterisics in polyethylene is found and cable with 1.7 times higher Impulse breakdown strength is developed. It is also cleared the ratio of crystalline and amorphous part is the important factor to derermine breakdown characteristics. Secondly, it is pointed out that chemical structure of polyethylene influences crosslinking characteristics, and, the relation between crosslinking and physical properties are investigated. Thirdly, new insulating material for high voltage DC cable is developed and the mechanism on DC characteristics are cleared.

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