摘要
为探究高压电缆充油终端铜网缺失和铅封缺陷等接地系统缺陷对终端电压和电流的影响,利用集中参数电路,建立电缆充油终端电阻电感电容(RLC)等效模型,基于COMSOL计算终端电容参数以及实验测试电阻参数,分析缺陷下终端电压和电流的变化特征,并通过实际故障案例加以验证。结果表明:铜网缺失导致终端外半导电层接地失效,外半导电层电压显著增大,进而引起放电;铅封断裂导致铝护套与尾管连接不可靠,造成终端铝护套电压悬浮,长期运行会造成铝护套与缓冲层间放电;铅封层间缺陷导致铝护套与铅封接触面积减小,铅封处允许的最小接触面积约为10%。
In order to explore the influence of high voltage cable oil filled terminal grounding system defects such as lack of copper net and lead seal defects of on the voltage and current of oil filled terminal, we built an RLC equivalent model of oil filled terminal. On the basis of capacitance parameters and test parameters computed by COMSOL, the change of terminal voltage and current characteristic under the defects was analyzed, and then it was verified by actual fault cases. The results show that the loss of copper net leads to the grounding failure of the outer semi-conductive layer, and the voltage of the outer semi-conductive layer increases significantly, results in the discharge. The lead seal fracture leads to the unreliability of the connection between the aluminum sheath and the tail pipe, results in the voltage suspension of terminal aluminum sheath, and causes the discharge between the aluminum sheath and the buffer layer under long-term operation. Defects between the lead seals reduce the contact area between the aluminum sheath and the lead seal, the minimum allowable contact area at the lead seal is about 10%.
作者
方春华
郭凯歌
卢佳杨
胡冻三
陈杰
曹京荥
FANG Chunhua;GUO Kaige;LU Jiayang;HU Dongsan;CHEN Jie;CAO Jingying(Hubei Provincial Engineering Technology Research Center for Power Transmission Line,Yichang 443002,China;College of electricity and new energy,Three Gorges University,Yichang 443002,China;Electric Power Research Institute of State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 210008,China)
出处
《绝缘材料》
CAS
北大核心
2022年第2期104-110,共7页
Insulating Materials
基金
国家自然科学基金资助项目(51807110)
湖北省输电线路工程技术研究中心开放课题(2019KXL07)。
关键词
终端缺陷
等效电路
铝护套电压
接地电流
defects of terminal
equivalent circuits
aluminum sheath voltage
grounding current
作者简介
方春华(1980-),男(汉族),湖北天门人,副教授,主要从事高电压绝缘与在线检测技术方面的研究。
