基于数字比较法的宽频标准电流互感器溯源技术研究  

Research on traceability technology of broadband standard current transformer based on digital comparison method

作　　者：姚力 许灵洁 李舜 陈骁 马笛 朱重冶 YAO Li;XU Lingjie;LI Shun;CHEN Xiao;MA Di;ZHU Chongye(Marketing Service Center,State Grid Zhejiang Electric Power Co.,Ltd.,Hangzhou 311100,China;Hangzhou Power Supply Company,State Grid Zhejiang Electric Power Co.,Ltd.,Hangzhou 310015,China;Ningbo Sunrise Instruments Co.,Ltd.,Ningbo 315032,Zhejiang,China)

机构地区：[1]国网浙江省电力有限公司营销服务中心,杭州311100 [2]国网浙江省电力有限公司杭州供电公司,杭州310015 [3]宁波三维电测设备有限公司,浙江宁波315032

出　　处：《电测与仪表》2024年第8期97-103,共7页Electrical Measurement & Instrumentation

基　　金：浙江省电力公司科技项目(5211YF220007)。

摘　　要：对于宽频标准电流互感器的校准,在50 Hz附近的频段通常采用测差的方法,而在低至5 Hz高至2.5 kHz的频率下,由于标准器大都采用磁通门传感器的原理,无法与被检互感器的变比一一对应,因此必须采用同步采样的数字比较方法,文中通过对同轴分流器的宽频特性分析,设计了一种适合同轴分流器自校准的宽频互感器校验仪,以此完成对宽频标准电流互感器的误差校准,并采用多功能校准源与高精度数字万用表的配合实现分流器的校准和溯源。文章提供了完善的校准方案和详实的测试数据,并对各环节的校准不确定度进行了科学的分析,论证了校准方法的合理性和准确性,本方法对目前正在运行的某省电力公司20 Hz示范性电网的计量工作有很大的实用意义。For the calibration of broadband standard current transformers,the method of measuring deviation is usually used in the frequency band near 50 Hz.However,at frequencies as low as 5 Hz and as high as 2.5 kHz,due to the principle of using flux gate sensors in most standard transformers,it is not possible to correspond one-to-one with the transformation ratio of the tested transformer.Therefore,a synchronous sampling digital comparison method must be used.This paper analyzes the broadband characteristics of coaxial shunt,a broadband transformer calibrator suitable for self calibration of coaxial splitters has been designed to achieve error calibration of broadband standard current transformers.The calibration and traceability of the splitter are achieved through the combination of a multifunctional calibration source and a high-precision digital multimeter.This paper provides a comprehensive calibration plan and detailed test data,and conducts a scientific analysis of the calibration uncertainty in each link,demonstrating the rationality and accuracy of the calibration method.This method has great practical significance for the measurement work of the currently operating 20 Hz demonstration power grid of Zhejiang Electric Power Company.

关 键 词：同轴分流器 磁通门传感器 宽频标准电流互感器 数字比较法校验仪 

分 类 号：TM932[电气工程—电力电子与电力传动]