影响电子式互感器校验系统设计精度的关键技术  

Key Technology of High-accuracy Design of Electronic Transformers Calibration System

作　　者：张明珠[1] 李开成[2] 李振兴[2] 

机构地区：[1]许昌学院数学与统计学院,河南许昌461000 [2]华中科技大学强电磁工程与新技术国家重点实验室,武汉430074

出　　处：《电测与仪表》2012年第12期41-45,共5页Electrical Measurement & Instrumentation

基　　金：国家自然科学基金资助项目(51077058);河南省教育厅科学技术研究重点资助项目(12A110022)

摘　　要：从提高校验系统的精度出发,分析影响校验系统精度设计的几个关键因素,包括信息测量和采样同步技术、数字信号处理技术、设计系统延时和度量溯源等,并提出一些解决技术方案。以八位半的高精度万用表HP3458A作为标准互感器的采集系统为例,分析了信息测量时的高精度采样,采样同步及其与合并单元的同步性等技术实现。进一步基于测量信息可离线分析的特点,提出多数字滤波器和计算算法相结合的信号处理技术,以提高信息测量精度。同时基于校验系统设计方案,提出相对应的比差和相位差溯源分析方案。试验结果显示校验系统具有较高的精度,较好的稳定性和可靠性。In this paper, some key factors affecting electronic instrument transformers （CSEIT） accuracy, including signal measurement, sampling synchronization, digital signals processing and metrological traceability are analyzed, and the corresponding solutions are also offered. Taken HP 3458A multimeter as measurement system, the paper shows that the selection of reference source transformer, sampling synchronization, merging unit synchronization and digital signal processing technology. Furthermore, the method of multi-filters and DSP fusion is proposed to enhance the accuracy of CSEIT based on off-line character for measurement signals. At the same time, a novel metrological traceability scheme of CSEIT is proposed based on FLUKE 5720A, a muhifunction calibrator with an accuracy of one per ten thousand, and BHE-I type. Results of verification show that the designed CSEIT can has higher accuracy and better reliability.

关 键 词：电子式互感器 校验系统 HP3458A 数字信号处理 溯源 

分 类 号：TM933[电气工程—电力电子与电力传动]