计量电流互感器二次回路在线监测技术研究  

Research on on-line monitoring technology of secondary circuit of metering current transformer

作　　者：王斌武 刘俭 张军 Wang Binwu;Liu Jian;Zhang Jun(China Electric Power Research Institute Co.,Ltd.,Wuhan 430074,China)

机构地区：[1]中国电力科学研究院有限公司,武汉430074

出　　处：《电子测量技术》2022年第17期29-35,共7页Electronic Measurement Technology

基　　金：国家电网公司科技项目(JL71-21-014)资助。

摘　　要：计量电流互感器二次回路异常状态不仅会给电网企业造成经济损失,而且还会酿成安全事故。为实现对二次回路状态的准确在线监测,通过理论研究不同状态下的回路等效电路,提出了一种基于10 kHz阻抗特征的二次回路状态监测方法,采用了基于微型互感器耦合和矢量电压电流法的回路10 kHz阻抗测量技术,研制了电流互感器回路状态监测装置。实验结果表明:研制的装置可在电流互感器变比为30/5~2000/5、环境温度为-40℃~60℃、二次电流为0%~120%I_(2n)的全工况下准确识别二次回路的正常连接、二次端子短接、二次开路和一次旁路状态。The abnormal state of the secondary circuit of metering current transformer will not only cause economic losses to power grid enterprises,but also lead to safety accidents.In order to realize the accurate on-line monitoring of the secondary circuit state,through the theoretical study of the circuit equivalent circuit under different states,a secondary circuit state monitoring method based on the 10 kHz impedance characteristics is proposed.The circuit 10 kHz impedance measurement technology based on micro transformer coupling and vector voltage current method is adopted,and the current transformer circuit state monitoring device is developed.The experimental results show that the developed device can accurately identify the normal connection of secondary circuit,short circuit of secondary terminal,secondary open circuit and primary bypass under the full working conditions of current transformer transformation ratio of 30/5~2000/5,ambient temperature of-40℃~60℃ and secondary current of 0%~120% I_(2n).

关 键 词：二次回路 计量回路 在线监测 回路监测 回路阻抗测量 电流互感器 

分 类 号：TM645.2[电气工程—电力系统及自动化]