摘要
利用电流比较仪测量微小误差电流的原理,采用嵌入式控制模块,由电流互感器误差校验回路中电流标准回路的电流信号产生的工作电压,通过程控的电导箱和电容箱产生与工作电压同相和正交的高准确度微差电流,并与被测电流互感器误差电流同时输入电流比较仪绕组,再通过高分辨力的数字指零仪进行自主平衡测量,实现了0.00001%至10%宽误差范围和50 Hz至1 kHz宽频带电流互感器的比值误差和相位误差的测量,与传统的电流互感器校验仪相比具有准确度高,测量范围宽和测量速度快等优点。
Based on the principle of measuring small error current by current comparator,the embedded control module is adopted.The working voltage generated by the current signal from the standard current loop in the error calibration circuit of the current transformer is used to produce weak error currents with high accuracy,both in-phase and orthogonal to the working voltage,through a program-controlled conductance box and capacitance box.These weak error currents,along with the error current of the tested current transformer,are simultaneously fed into the winding of the current comparator.And then autonomous balance measurement is performed using a high-resolution digital null detector,achieving ratio error and phase error measurements for wideband current transformers within a wide error range of 0.00001%to 10%and a wide frequency band of 50 Hz to 1 kHz.Compared with traditional current transformer calibrators,this method offers advantages such as higher accuracy,a wider measurement range,and faster measurement speeds.
作者
金海彬
胡志远
梁晟直
任秀伟
JIN Haibin;HU Zhiyuan;LIANG Shengzhi;REN Xiuwei(Beijing Orient Institute of Measurement&Test,Beijing 100086,China;Shanxi Transformer Electrical Testing Equipment Co.,Ltd,Taiyuan,Shanxi 030009,China)
出处
《计量学报》
北大核心
2025年第1期19-24,共6页
Acta Metrologica Sinica
基金
国家国防科技工业局技术基础项目。
关键词
电磁计量
误差测量仪
电流互感器
校验仪
宽频带
electromagnetic meteorology
error measuring instrument
current transformer
calibrator
broadband
