基于容性设备接地电流的金属氧化物避雷器阻性电流现场检测方法  

On-Site Detection Method for Resistive Current of Metal-Oxide Surge Arrester Based on Ground Current of Capacitive Equipment

作　　者：邢超 赵军 刘涛 杨桦 杨世博 王辉 XING Chao;ZHAO Jun;LIU Tao;YANG Hua;YANG Shibo;WANG Hui(State Grid Hebei Electric Power Research Institute,Shijiazhuang 050021,China;State Grid Baoding Electric Power Supply Company,Baoding 071000,China;State Grid Hebei Electric Power Maintenance Company,Shijiazhuang 050011,China;Hebei Power Transmission and Transformation Co.,Ltd.,Shijiazhuang 050000,China)

机构地区：[1]国网河北省电力有限公司电力科学研究院,石家庄050021 [2]国网河北省电力有限公司保定供电分公司,河北保定071000 [3]国网河北省电力有限公司检修分公司,石家庄050011 [4]河北省送变电有限公司,石家庄050000

出　　处：《电瓷避雷器》2022年第1期113-117,共5页Insulators and Surge Arresters

摘　　要：现场检测避雷器阻性电流使用的方法分为检修电源法、感应板法、PT二次法。每种测试方法均有各自局限性。当前比较常用的方法是PT二次法,由于需要频繁操作PT二次端子,存在电网短路隐患。因此,提出了一种采用容性设备接地电流作为参考信号的测试方法,测量时无需接触任何参考电压端子,利用容性设备接地电流作为参考信号间接获取避雷器运行电压相位,进而计算得出避雷器阻性电流。通过对PT角差和电流互感器介质损耗角的对比分析以及现场检测验证了该方法的准确性。The on-site methods to detect the resistive current of metal oxide surge arresters are divided into three types: the method of using power supply, the method of using induction board and the method of PT secondary terminal. Each one has its own limitations. The method of PT secondary terminal is commonly used. Since the PT secondary terminals need to be operated frequently, there is a hidden risk of short circuit in the power grid. In response to this problem, a test method using ground current of capacitive equipment as reference signal is proposed. Resistive current can be calculated based on voltage phase of surge arresters which is indirectly obtained by taking ground current of capacitive equipment as a reference signal without touching any reference voltage terminals during measurement. The accuracy of the method is verified by comparative analysis on the angle difference of PT and the CT dielectric loss angle as well as the on-site inspection.

关 键 词：避雷器 容性设备 接地电流 参考信号 PT角差 介质损耗角 

分 类 号：TM862[电气工程—高电压与绝缘技术]