微间隙持续放电下电缆接头温度-应力分布及界面开裂规律研究  

Research on Temperature-stress Distribution and Interface Cracking Law of Cable Joint Under Micro-gap Continuous Discharge

作　　者：王成江[1] 郭鸣锐 张扬 曾洪平 张婧 祝梦雅 WANG Chengjiang;GUO Mingrui;ZHANG Yang;ZENG Hongping;ZHANG Jing;ZHU Mengya(College of Electrical Engineering&New Energy,China Three Gorges University,Yichang 443002,China)

机构地区：[1]三峡大学电气与新能源学院,湖北宜昌443002

出　　处：《绝缘材料》2022年第4期94-102,共9页Insulating Materials

基　　金：国家自然科学基金资助项目(51807110)。

摘　　要：为深入研究微间隙放电下电缆接头温度与应力的变化规律,探究其对电缆接头复合界面的开裂影响,本文以110 kV电缆中间接头为原型,结合实际电缆接头中气隙最常出现的位置建立三维仿真模型。以温度、应力及界面开裂量作为衡量电缆接头损伤程度的指标,在考虑接头附件与电缆本体间初始紧握力与气隙压强的情况下,利用有限元法计算出间隙放电能量、气隙压强、气隙厚度及气隙位置变化时接头温度与应力的变化规律,并重点研究间隙放电能量及气隙压强变化时接头复合界面的开裂情况。结果表明:随着间隙放电功率的增加,气隙附近局部温度和应力均呈快速上升趋势,在距原气隙一段距离出现界面开裂现象并形成新气隙。随气隙压强的增加,气隙面应力呈先下降后上升趋势,气隙负压有增大局部应力的效果,而气隙正压在一定区间内可以减小局部应力,并导致气隙两侧界面开裂造成原有气隙的持续扩张。In order to deeply study the variation rule of cable joint temperature and stress under micro-gap discharge and explore its influence on the cracking of the composite interface of cable joints,we took 110 kV cable intermediate joint as the prototype,established a three-dimensional simulation model combining with the most common air gap position in actual cable joint.Temperature,stress,and interface crack were taken as indexes to measure the damage degree of cable joint,the initial grip force between cable joint and ontology as well as the air gap pressure were taken into consideration,the charge law of temperature and stress of the joint with the change of gap discharge energy,air gap pressure,air gap thickness,and air gap position was calculated by finite element method.The effect of the change of gap discharge energy and air gap pressure on cracking situation of the composite interface of the joint was studied in detail.The results show that with the increase of the gap discharge power,the local temperature and stress near the gap increase rapidly,and the interface cracks appear at a distance from the original air gap and new gap generates.With the increase of the air gap pressure,the gap pressure decreases at first and then increases.The negative air gap pressure can increase the local stress,while the positive air gap pressure can reduce the local stress in a certain range,which leads to the interface cracking on both sides of the gap,results in the continuous expansion of the original gap.

关 键 词：电缆接头 界面 气隙 持续放电 开裂 

分 类 号：TM246[一般工业技术—材料科学与工程]