摘要
中间接头受潮是电力电缆的常见缺陷,水分对接头性能的影响至关重要。通过仿真分析接头受潮时的电场分布,并以XLPE试品为实验对象,测试不同受潮程度下的击穿电压。仿真结果表明:主绝缘外侧的复合界面中,水膜处的电场仅为正常时的20%~60%,但水膜周围电场普遍增大,且随着受潮程度的增加,电场畸变越发严重,易诱发击穿事故;导体外侧水膜周围电场则没有发生明显畸变,不会直接诱发事故。通过XLPE受潮试品的击穿电压实验发现:平均击穿电压为正常时的85%到94%,且随着水分增加而降低,试验结果与仿真结果所得出的结论基本一致。成果可用于指导电缆中间接头事故原因分析。
Dampness in the joint is a common defect of power cable.Moisture greatly weakens the performance of intermediate joint due to joint dampness.This paper analyzes the electric field distribution of the joint by simulation,and tests the breakdown voltage under different dampness levels by experimenting on XLPE samples.Simulation results show that in the composite interface outside of the main insulation,the electric field at the water film is only 20%to 60%of the normal,but the electric field around the water film generally increases.And as the dampness level increases,the electric field distortion becomes more serious,which is prone to induce breakdown accidents.But the electric field around the water film outside the conductor has no obvious distortion and will not directly induce accidents.Through the breakdown voltage experiment of the XLPE damp sample,it is found that the average breakdown voltage is 85%to 94%of the normal,and it decreases with the increase of moisture.The experimental results are consistent with the simulation results,which are useful in analyzing the cause of cable intermediate joint accident.
作者
方春华
叶小源
杨司齐
丁璨
普子恒
FANG Chunhua;YE Xiaoyuan;YANG Siqi;DING Can;PU Ziheng(College of Electrical Engineering and New Energy,China Three Gorges University,Yichang 443002,China)
出处
《华北电力大学学报（自然科学版）》
CAS
北大核心
2021年第2期64-72,共9页
Journal of North China Electric Power University：Natural Science Edition
基金
国家自然科学基金资助项目(51607103)。
关键词
电力电缆
中间接头
受潮
电场分布
power cable
intermediate joint
dampness
electric field distribution
