There is provided a rubber/plastic insulated power cable or a joint of power cables which comprises a conductor or a conductor joint having an inner semiconductor layer and an insulation layer, and if necessary, an outer semiconductor layer, formed thereon in the order named, at least one of these layers being formed of a crosslinked structure of an olefin resin composition containing an olefin resin, an organic peroxide, and 2,4-diphenyl-4-methyl-1-pentene. The 2,4-diphenyl-4-methyl-1-pentene serves to inhibit "amber" of the olefin resin composition by the organic peroxide used and to increase the degree of crosslinking of crosslinked structure. Also, the olefin resin with a high melting point can be used as a base resin. Therefore, the resultant power cable and joint have highly improved AC breakdown strength, impulse breakdown strength at a high temperature and much less generation of electrical trees due to "amber", so that they are useful paticularly high-voltage application.
本发明提供了一种橡胶/塑料绝缘电力电缆或电力电缆接头,它包括导体或导体接头,导体或导体接头上按指定顺序形成有半导体内层和绝缘层,必要时还有半导体外层,其中至少有一层是由烯烃
树脂组合物的交联结构形成的,该烯烃
树脂组合物含有烯烃
树脂、有机过氧化物和
2,4-二苯基-4-甲基-1-戊烯。
2,4-二苯基-4-甲基-1-戊烯的作用是用有机过氧化物抑制烯烃
树脂组合物的 "琥珀色",并增加交联结构的交联度。此外,熔点高的烯烃
树脂可用作基础
树脂。因此,所生产的电力电缆和接头的交流击穿强度和高温冲击击穿强度都有很大提高,而且由于 "琥珀色 "而产生的电树也少得多,因此特别适用于高压应用。