基于改进型数字比较法的15~30 Hz低频互感器误差校验技术研究  

Error Measurement Method of 15~30 Hz Low Frequency Transformer Based on Improved Digital Comparison Method

作　　者：熊博 刘浩 周峰 李鹤 黄天超 XIONG Bo;LIU Hao;ZHOU Feng;LI He;HUANG Tianchao(China Electrical Power Research Institute,National Central for High Voltage Measurement,Wuhan,Hubei 430074,China;Marketing Service Center of State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing,Jiangsu 210019,China)

机构地区：[1]中国电力科学研究院有限公司国家高电压计量站,湖北武汉430074 [2]国网江苏省电力有限公司营销服务中心,江苏南京210019

出　　处：《计量学报》2024年第11期1601-1606,共6页Acta Metrologica Sinica

基　　金：国家电网有限公司总部管理科技项目(5108-202218280A-2-414-XG)。

摘　　要：对低频校验仪的误差测量技术进行了全面研究,旨在实现高精度的测量。首先,对数据采集卡中A/D通道的低频误差线性进行了分析和测试。针对采样数据点的低频误差,提出了一种动态补偿方法。此外,使用采样序列重建方法消除了通道增益误差。设计了采样频率和信号频率之间的最佳自适应比,以及低频信号数据处理的优化算法,显著提高了低频校验仪的测量精度。测试结果表明,测量不确定度显著改善,对于不同的输入比和频率,比率差和相位差降低到10×10^(-6)(10μrad)。To presents a comprehensive study on error calibration technology for low frequency instrument transformers test set,aiming to achieve high accuracy measurements.Firstly,the low frequency error linearity of the A/D channel in the data acquisition board is analyzed and tested.To address the low frequency error in the sampling data points,a dynamic compensation method is proposed.Additionally,the channel gain error is eliminated using the sampling sequence reconstruction method.An optimal adaptation ratio between the sampling frequency and signal frequency is designed,along with an optimization algorithm for low-frequency signal data processing,significantly improving the measurement accuracy of low-frequency instrument transformers test set.The test results demonstrate a remarkable improve in measurement uncertainties,with ratio difference and phase difference reduced to 10×10^(-6)(10μrad)for different input ratios and frequencies.

关 键 词：电学计量 低频输电 低频互感器 测量不确定度 精密测量 数字比较法 采样序列重构 

分 类 号：TB971[一般工业技术—计量学]