型式试验对高压直流电缆交联副产物迁移过程及电导特性的影响

doi:10.11985/2018.11.006

摘要/Abstract

摘要：

为了保证高压直流电缆满足预期的使用条件和长期运行的稳定性,需要对高压直流电缆进行型式试验。对型式试验前后电缆的主绝缘由内层到外层交联副产物含量变化以及不同温度下电流密度随电场强度变化曲线进行分析。实验结果表明,型式试验抑制了低场强下的载流子迁移,促进交联副产物由内层向中层和外层迁移,且交联副产物的含量越多,温度越高,电流密度的阈值电场越低。

关键词: 型式试验, 交联副产物, 温度, 电流密度, 阈值电场

Abstract:

In order to ensure the expected conditions of using and long-term stability of the high voltage cable, a type test of the high voltage DC cable is required. Through the analysis of the content of cross-linking by-products from the inner layer to the outer layer and the current density at different temperatures as a function of the electric field strength of the main insulation of the cable before and after the type test. The experimental results show that the type test suppresses the carrier mobility of low field strength and promotes the migration of cross-linking by-products from the inner layer to the middle layer and the outer layer, the more the cross-linking by-product content and the higher the temperature, the lower the threshold electric field of the current density.

Key words: Type test, cross-linking by-product, temperature, current density, threshold electric field

中图分类号:

TM215

范路,陈萌,张洪亮,王亚林,吴建东,尹毅. 型式试验对高压直流电缆交联副产物迁移过程及电导特性的影响[J]. 电气工程学报, 2018, 13(11): 44-51.

Fan Lu,Chen Meng,Zhang Hongliang,Wang Yalin,Wu Jiandong,Yin Yi. Effect of Type Test on Migration Process of Cross-Linked By-Products and Conduction Characteristics of HVDC Cables[J]. Journal of Electrical Engineering, 2018, 13(11): 44-51.

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试验项目	试验方法
负荷循环试验	±592kV下,8个24h负荷循环
	8个24h负荷循环,同时464kV下极性反转
	592kV下,3个48h负荷循环
叠加冲击电压实验	DC = + 320kV,LI = - 368kV,连续10次
叠加冲击电压实验	DC = - 320kV,LI = + 368kV,连续10次
叠加雷电冲击电压试验	DC = + 320kV,LI = - 672kV,连续10次
叠加雷电冲击电压试验	DC = - 320k,LI = + 672kV,连续10次
直流电压试验	DC = - 592kV,2h

温度 /℃	阈值电场/(kV/mm)
	型式试验前			型式试验后
	内层	中层	外层	内层	中层	外层
30	>20.0	15.8	13.3	8.0	7.3	7.9
50	9.0	8.4	8.0	6.0	6.0	6.0
70	6.6	5.7	5.5	4.5	4.7	4.8
90	3.7	3.8	3.8	3.6	4.1	4.2