高压XLPE电缆附件故障案例分析及讨论

Case Study and Discussion on Faults of High Voltage XLPE Cable Accessories

高压电缆系统是城市电网的重要组成部分,一旦发生故障将会造成重大损失。对故障原因的正确分析有助于线路维修工作的顺利进行,排除电缆线路隐患,进一步保障高压电缆线路的安全运行。结合实际案例对由于材料失效、界面压强不足、安装不当造成的高压电缆附件故障进行了分析。通过对故障附件的击穿主通道进行定位,结合材料理化分析,参考附件尺寸结构和安装工艺,并综合考虑线路的敷设方式以及故障录波信息,理清故障成因并对其劣化发展过程进行了复现。在此基础上对高压电缆线路的安全运行和故障预防提出了建议。

High voltage cable system is an important part of the power grid in cities,and huge loss would be caused if fault occurs.The correct interpretation of the cause of the fault will greatly help the repair work of the defective ca⁃ble circuit,getting rid of the safety risk and enduring the proper operation of the power cable system.In this paper,fault cases caused by insulating material failure,inadequate interface pressure,and improper installation are ana⁃lyzed.By locating the main breakdown channel,testing the insulating materials,reviewing the dimensions and instal⁃lation requirements of the accessories,and considering the laying of the cable circuit and fault records,the causes and the developing process of the faults are investigated.Based on this work,suggestions to help to improve safe oper⁃ation of high voltage cable system and discovering weak point in advance are proposed.