摘要
为及时发现高压电缆交叉互联接地系统中的故障问题,基于电缆金属护层首末两端的接地电流,构造了一种新型判据来实现电缆故障的分类与定位。该方法通过测量电缆交叉互联主段首末两端直接接地箱中金属护层接地电流的幅值与相位,并以同一金属护层回路首末两端接地电流幅值与相位的比值、以不同金属护层回路首末两端接地电流相位差的绝对值构造新的特征量,根据多维特征融合建立故障判据对应的特征量矩阵,以此进行故障诊断。分析了电缆中间接头开路、交叉互联接地箱进水和中间接头短路等常见的电缆故障,并通过仿真验证了新型故障判据的可行性,为高压电缆线路故障的在线监测提供了新的方法。
In order to timely discover the faults in the high-voltage cable cross-interconnected grounding system,this paper constructs a new criterion based on the ground currents at both ends of the metal sheath of cable to classify and locate the faults of power cables.Firstly,the amplitude and phase of grounding current of metal sheath in direct-grounding boxes at both ends of the main section of cable cross-interconnection are measured;and then a new characteristic quantity is constructed using the amplitude ratio and phase ratio of grounding current at both ends of the same metal sheath circuit and the absolute value of phase difference of grounding current at both ends of different metal sheath circuits;and finally a characteristic quantity matrix corresponding to fault criteria is established to identify the faults based on multi-dimensional characteristic fusion.The common cable faults,such as the open circuit of the cable intermediate joints,the water infiltration into the cross-interconnection grounding box,and the short circuit of the cable intermediate joints,are analyzed,and the feasibility of the new fault criterion is verified by simulation,which can provide a new method for on-line monitoring of high-voltage cable faults.
作者
周欣
夏向阳
夏君山
陈善求
张育粱
杨隆凯
罗彦鹏
王瑞琪
刘雄
ZHOU Xin;XIA Xiangyang;XIA Junshan;CHEN Shanqiu;ZHANG Yuliang;YANG Longkai;LUO Yanpeng;WANG Ruiqi;LIU Xiong(School of Electrical and Information Engineering,Changsha University of Science and Technology,Changsha 410114,China;Goldcup Electric Apparatus Co.,Ltd.,Changsha 410007,China)
出处
《中国电力》
CSCD
北大核心
2021年第9期45-54,118,共11页
Electric Power
基金
国家自然科学基金资助项目(柔性直流输电交流侧故障下换流器多桥臂主动应对的能量调控机理及穿越控制研究,51977014)
长沙市科技计划资助项目(输变电电缆故障在线监测与识别,kq2004074)。
关键词
高压电缆
交叉互联
金属护层
接地电流
故障分类
high voltage cable
cross-interconnection
metal sheath
ground current
fault classification
