交流電圧印加時におけるアセトフェノン塗布LDPEフィルムの高電界電気特性

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XLPE cable, whose maintenance and supervision are easier than OF cables, is widely used as electric power cable. Electrical insulation material of XLPE cable is cross-linked polyethylene (XLPE) which has greater heat-resistance and superior mechanical properties than normal low-density polyethylene. XLPE for large power cable is generally cross-linked by chemical agents such as dicumyl peroxide. Curing decomposition by-products such as acetophenone, cumyl alcohol, α-methylstyrene and so on remain in XLPE after cross-linking. It is known that acetophenone exerts most influence on the electrical insulation characteristics of XLPE among them, and it has been clarified that the existence of acetophenone suppresses an electrical tree initiation. In this report, the effect of acetophenone on tanδ and capacitance, and electrical breakdown under the AC voltage application in acetophenone-coated LDPE film are studied. This paper deals with the effect of acetophenone on dielectric properties such as tanδ and capacitance under the AC voltage application in acetophenone-coated low density polyethylene (LDPE) film. The existence of acetophenone at the electrode interface enhance tanδ. Tanδ increased with electric field and decreased inversely proportional to the frequency in the high field and high temperature region in acetophenone-coated specimen. AC breakdown test gave the result that the electric strength in non-coated specimen was higher than that in acetophenone-coated one and that the electric strength also decreased with temperature.
宇部工業高等専門学校の論文

交流電圧印加時におけるアセトフェノン塗布LDPEフィルムの高電界電気特性

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