电子式电流互感器模拟量输出校验技术的研究

Research on calibration technique for analog output of electronic current transformers

电子式电流互感器(ECT)是一种用于电气测量和保护的新型电流传感器,其标准定义的输出信号有别于传统电流互感器的输出信号。针对传统电流互感器校验技术及装置无法满足新型电子式电流互感器校验要求的问题,本文根据IEC60044-8,对基于差值测量法的ECT模拟量输出校验技术、系统构成及误差进行了理论分析,并利用研制的校验系统进行试验,试验结果验证了所述方法及系统的正确性。

The electronic current transformer （ECT） is a new kind of current transducer, which is used for electrical measurement and protection purpose. Its output signals defined by the relevant standard are different from those of traditional current transformers. In view of the fact that traditional CT calibration technique and devices can＇t meet the requirement of ECT calibration, According to IEC60044-8 and based on difference measurement method, an ECT calibration system and its circuits are discussed in this paper. The system operation principle and measurement errors are theoretically analyzed. By using a developed calibration system, the experimental results have verified the correctness of both theory analysis and calibration system operation.