电子式电流互感器温度特性分析  

Temperature Characteristic Analysis on Electronic Current Transformer

作　　者：王鹏[1] 张贵新[1] 朱小梅[1] 罗承沐[1] 

机构地区：[1]清华大学电机工程与应用电子技术系,北京100084

出　　处：《电工技术学报》2007年第10期60-64,共5页Transactions of China Electrotechnical Society

摘　　要：环境温度变化会影响电子式电流互感器的测量准确度,在研制过程中需对其温度影响准确度特性进行分析。根据一种基于低功率电流互感器(LPCT)的电子式电流互感器系统各组成部分的功能特点,推导出LPCT及高压侧信号处理电路的温度特性表达式。对研制出的220kV电子式电流互感器样机进行了型式试验,结果表明,所研制的样机满足IEC0.2级测量准确度要求,在?25～50℃温度变化范围内电流比值误差(简称比差)小于±0.1%,相位误差(简称角差)小于4′。试验结果验证了温度特性分析的有效性。Measuring accuracy is a key parameter for electronic current transformer（ECT）, but the temperature variation of the surrounding environment may influence its measuring accuracy. Temperature-dependent accuracy is one characteristic for ECT compared to traditional current transformer and it is a key parameter to be analyzed during the development of ECT. According to the function of an ECT based on low power current transformer （LPCT）, several sub-systems are decomposed by this paper. Temperature-dependent accuracy of these sub-systems is analyzed and the expressions on temperature dependence of LPCT and the amplifiers in the electronic circuitry in high voltage side are proposed. One type of electronic current transformer was developed and passed the type test in the national authoritative department of China. The test results show that the transformer developed by this paper fulfils IEC 0.2 class accuracy requirements and achieves accuracy within ±0.1% in ratio error and ±4＇ in phase error at -25-50℃. The validity of the analysis is confirmed by the results.

关 键 词：电子式电流互感器 温度特性 温度影响准确度 温漂 误差分析 

分 类 号：TM451[电气工程—电器]