电子式互感器误差分析  

Error analysis of electronic instrument transformers

作　　者：王鹏[1] 张贵新[1] 李莲子[1] 朱小梅[1] 罗承沐[1] 

机构地区：[1]清华大学电机工程与应用电子技术系,北京100084

出　　处：《清华大学学报（自然科学版）》2007年第7期1105-1108,共4页Journal of Tsinghua University(Science and Technology)

摘　　要：为提高电子式互感器的测量准确度,研究了其系统中的误差特性。在对其中噪声特点进行分析的基础上,对前级放大器、A/D转换器以及低压侧信号处理系统等单元的误差特性进行了研究,指出了影响系统测量准确度的关键环节。在此基础上,给出了元件选择和系统设计的参照原则,并研制出220 kV电压等级电子式电流互感器样机。试验结果表明:该互感器满足IEC 0.2级测量准确度要求,并且-30℃^+70℃范围内,测量比差小于±0.1%,角差小于±2′。验证了误差分析的有效性。The system error characteristics are analyzed to improve the measurement accuracy of electronic instrument transformers. The noise characteristics of the electronic instrument transformers are related to the error characteristics of front-amplifiers, A/D converters, and signal processing units on the low-voltage side. The analysis identifies the key factors influencing the system measurement accuracy. Criteria are then developed for component selection and system design of the transformers with a 220 kV electrortic current transformer developed and tested. The results show that the current transformer meets the IEC 0. 2 class accuracy requirements, has a ratio the range of error of less than ± 0. 1% and a phase error of less than ± 2＇ at the range of - 30℃ to ＋ 70℃.

关 键 词：电流互感器 误差分析 噪声 信号处理 温度影响准确度 

分 类 号：TM452[电气工程—电器]