220 kV电缆中间接头XLPE绝缘收缩电场分析Analysis on Electric Field of Stress Cone with XLPE Insulation Shrinkage of 220 kV Cable Intermediate Joints
陶瑞祥,王成珠,姜云土,曹俊平,王少华
TAO Ruixiang,WANG Chengzhu,JIANG Yuntu,CAO Junping,WANG Shaohua
摘要(Abstract)：
以正常电缆接头、单侧XLPE(交联聚乙烯)绝缘收缩的电缆接头、双侧XLPE绝缘收缩的电缆接头为研究对象,计算三类电缆接头内部电场分布,研究电缆接头内部XLPE绝缘出现收缩但未脱离高压应力锥时,特定路径上电场的变化,并特别关注实际运行过程中容易出现击穿故障的高压应力锥端部的电场变化。计算结果表明:不论正常电缆接头还是XLPE绝缘收缩的缺陷接头,其高压应力锥的端部电场均最大,且当XLPE绝缘出现收缩时,高压应力锥的端部电场还有明显增大;电缆接头XLPE绝缘出现收缩时,高压应力锥与XLPE接触段电场强度随收缩距离的增大而增大,但收缩距离对高压应力锥端部电场的影响不明显;因电缆接头XLPE绝缘收缩而产生的气隙对高压应力锥端部电场的影响远超XLPE绝缘收缩;XLPE绝缘出现双侧收缩或因收缩产生气隙时,两侧各重点区域的电场分布不会相互影响。该研究结果可为电缆接头故障诊断提供理论支撑。
Taking the normal cable joint, cable joint with unilateral XLPE insulation shrinkage and cable joint with bilateral XLPE insulation shrinkage as the objects of study, the paper calculates electric field distributions inside the cable joints and studies electric field change on specific paths in case of XLPE insulation shrinkage without separating from stress cones. Moreover, it pays special attention to electric field change at the stress cone terminals that are prone to breakdown in practical operation. The calculation results show that there are maximum electric fields at stress cone terminals of both normal cable joints and deficient joints with XLPE insulation shrinkage; moreover, in the case of XLPE insulation shrinkage the electric field at stress cone terminal increases evidently, and when the XLPE insulation of the cable joint shrinks, the electric field of the contact section between the high-voltage stress cone and XLPE increases with the shrinkage expansion.However, the effect of the shrinkage distance on the end of the high-voltage stress cone is not significant. Air gaps produced by XLPE shrinkage wield more influence on the stress cones than XLPE insulation shrinkage does. In the case of bilateral XLPE insulation shrinkage or air gaps produced by the shrinkage, the electric field distributions in key areas on both sides do not interact. The research findings can provide theoretical support to cable joint fault diagnosis.
关键词(KeyWords)：
电缆接头;XLPE绝缘;收缩;电场
cable joint;XLPE insulation;shrinkage;electric field
基金项目(Foundation): 国网浙江省电力有限公司科技项目（5211DS19002Z）
作者(Author):
陶瑞祥,王成珠,姜云土,曹俊平,王少华
TAO Ruixiang,WANG Chengzhu,JIANG Yuntu,CAO Junping,WANG Shaohua
DOI: 10.19585/j.zjdl.202111004
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