变压器空投时电子式电流互感器输出励磁涌流波形异常分析  

Analysis on Abnormal Magnetizing Inrush Current Output from Electronic Current Transformer When No-load Transformer Operates

作　　者：郑玉平[1,2] 潘书燕[3,2] 夏雨[3,2] 王中浪 马玉龙[3] 龙锋[3,2] 

机构地区：[1]南瑞集团公司(国网电力科学研究院),江苏省南京市211106 [2]智能电网保护和运行控制国家重点实验室,江苏省南京市211106 [3]国电南瑞科技股份有限公司,江苏省南京市211106

出　　处：《电力系统自动化》2017年第9期188-193,共6页Automation of Electric Power Systems

摘　　要：针对某110kV变电站变压器空投时电子式电流互感器(ECT)输出的采样波形,分析了波形的异常特征,从基于Rogowski线圈的ECT保护电流采样系统中有损积分器的传递特性入手,推导了时间常数与传变误差关系的解析表达式,得出ECT达到5TPE级精度对积分时间常数选择的要求。基于理论分析建立仿真模型,并通过波形拟合手段,可得出励磁涌流波形异常的主要原因是现场ECT积分器时间常数的选择不当,同时仿真也证明选择适当积分器时间常数的ECT具有良好的暂态传变特性。For the no-load transformer operating in a 110 kV substation,the abnormal characteristics of magnetizing inrush current waveform output from the electronic current transformer（ECT）are analyzed.According to the transfer characteristic of lossy integrator in the protection current acquisition system of ECT based on Rogowski coil,the analytical expression of the relation between the time constant and the transmission error is derived.Thus an appropriate integration time constant is selected to achieve 5TPE level accuracy of ECT.A simulation model is developed based on the theoretical analysis.After waveform fitting,it is proved that the main reason of abnormal magnetizing inrush current waveform is the improper integrator time constant of ECT.Meanwhile,the simulation also shows that the ECT with a proper integrator time constant has better transient transfer characteristics.

关 键 词：ROGOWSKI线圈 电子式电流互感器 有损积分器 励磁涌流 时间常数 

分 类 号：TM452[电气工程—电器]