基于时间数字转换器的数字输出电子式互感器校验系统  

TDC-based calibration system of electronic transformer with digital output

作　　者：范洁[1] 程含渺 季欣荣[1] 陈刚[1] 周玉[1] 陈霄[1] 易永仙 

机构地区：[1]江苏省电力公司电力科学研究院,江苏南京211103 [2]华中科技大学电气与电子工程学院,湖北武汉430074

出　　处：《电力自动化设备》2014年第10期164-168,共5页Electric Power Automation Equipment

基　　金：国家电网公司科技项目(52100113058M)~~

摘　　要：为了提高基于高精度采集卡的数字输出电子式互感器校验系统的相位测量精度,分析了其相位测量误差产生的原因。基于此,提出通过时间数字转换器(TDC)测量采集卡从触发采样到开始采样的时间差,再将该时间差换算为角度以校正相位,给出了所提方法在校验系统中的实现方法。对应用所提方法的校验系统的准确度进行理论分析,结果表明其测量准确度为0.05级,可用于校验精度为0.2级及以下的电子式互感器。In order to improve the phase measurement accuracy of the electronic transformer with digital output based on the high-accuracy data acquisition card,the causes of its phase measurement error are analyzed. It is proposed that,the time difference between triggering and sampling should be measured and converted to degree by a TDC（Time-Digital Converter） for correcting the phase angle. Its implementation in the calibration system is given. The accuracy of the calibration system applying the proposed method is theoretically analyzed and results show its accuracy is of 0.05 grade,suitable for calibrating the electronic transformers of 0.2 grade and below.

关 键 词：电子式互感器 校验系统 采样 非同步 时间数字转换器 相位校正 测量误差 

分 类 号：TM743[电气工程—电力系统及自动化]