环境友好型直流电缆料聚丙烯绝缘的电树枝研究进展

doi:10.11985/2018.11.003

摘要/Abstract

摘要：

聚丙烯因具有优异的电气和耐热性能,符合环保可回收电缆绝缘材料的发展需求,从而引起广泛关注。高压直流电缆在运行过程中,除了承受直流额定电压外,还要承受脉冲电压,导致线路电压急剧变化,加剧电场畸变。电缆温度变化影响绝缘材料电导率及空间电荷积聚,使绝缘材料内部电场畸变,导致电树枝的引发和生长。本文对比了相同条件下聚丙烯与交联聚乙烯电树枝生长特性,分析了直流脉冲复合场、温度等因素对聚丙烯电树枝生长特性的影响规律,探讨了不同方法抑制电树枝的机理。

关键词: 高压直流电缆, 聚丙烯, 电树枝, 直流脉冲复合场, 温度

Abstract:

As the environmentally friendly and recyclable cable insulation materials, polypropylene (PP) has attracted wide attention due to its excellent electrical and heat resistance properties. Besides the DC voltage, the operating impulse overvoltage often occurs in HVDC cable. At the same time, the change of cable temperature affects the electrical conductivity and space charge accumulation of insulating materials, which leads to the distortion of electric field in insulating materials, leading to the initiation of electrical trees. In this paper, the growth characteristics of polypropylene and crosslinked polyethylene were compared under the same conditions. The effects of DC-pulse combined electric field and temperature on the growth characteristics of polypropylene were analyzed, and the mechanism of different methods to restrain the electrical tree was discussed.

Key words: HVDC cable, polypropylene, electrical tree, DC-pulse combined voltages, temperature

中图分类号:

TM85

朱乐为,杜伯学. 环境友好型直流电缆料聚丙烯绝缘的电树枝研究进展[J]. 电气工程学报, 2018, 13(11): 21-29.

Zhu Lewei,Du Boxue. Research Status on Electrical Tree of Polymer Insulation Materials in HVDC Cables[J]. Journal of Electrical Engineering, 2018, 13(11): 21-29.

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幅值/kV	频率/Hz	-30℃	-90℃	-196℃
15	400	树枝状	丛林状	树枝状
15	800	树枝状	丛林状	树枝状
15	1 200	树枝状	丛林状	树枝状