基于闭环算法的光学电流互感器的暂态电流误差特性研究  

Study on Transient Current Error Characteristics of Optical Current Transformer Based on Closed⁃loop Algorithm

作　　者：王耀[1] 赵玉灿[1] 阎嫦玲[1] 罗苏南[1] 赵森林[1] 熊慕文[1] WANG Yao;ZHAO Yucan;YAN Changling;LUO Sunan;ZHAO Senlin;XIONG Muwen(NR Electric Co.,Ltd.,Nanjing 211106,China)

机构地区：[1]南京南瑞继保电气有限公司,南京211106

出　　处：《高压电器》2022年第3期148-154,共7页High Voltage Apparatus

摘　　要：基于对光学电流互感器闭环调制解调算法的数学分析,研究了闭环算法对一次电流的计算误差来源,证实闭环算法的计算误差只与一次电流的变化速率相关,并在此基础上研究了暂态电流工况下,典型光CT的误差特性,探讨了减小暂态电流误差的几类措施并进行试验验证,证实减少传感光纤匝数、缩短光路总长度以及线性度误差实时补偿均可有效修正闭环算法的计算误差,提高互感器的暂态电流精度。The source of calculation error of the closed⁃loop algorithm to the primary current is studied on the basis of mathematical analysis of closed⁃loop demodulation algorithm of fiber optical current transformer.It is proved that the calculation error of the closed⁃loop algorithm is only related to the variation rate of primary current and,on this basis,the error characteristic of typical optical current transformer is studied in the condition of transient current.Several measures on reducing transient current error is discussed and the test verification is performed.It is proved that reducing the number of turns of sensing fiber,shortening the total length of optical path and real⁃time compensa⁃tion of linearity error can effectively eliminate the calculation error of closed⁃loop algorithm and improve the transient current accuracy of OCT.

关 键 词：光学电流互感器 闭环调制 暂态电流 测量误差 线性度补偿 

分 类 号：TM452[电气工程—电器]