电子式电流互感器校验方法研究

提出一种校验电子式电流互感器模拟量输出和数字量输出的方法,该方法基于采样测量技术,测量标准电流互感器和被校电子式电流互感器的二次输出,比较二者的差异得到被校电子式电流互感器的比值误差和相位误差。详细分析了电子式电流互感器模拟量输出及数字量输出校验方法的测量误差,论证了该方法的合理性和可行性。根据该方法研制的校验装置样机在国家高电压计量站进行了校准测试,测试结果表明,所研制的校验装置满足校验0.2及以下等级计量用电子式电流互感器的准确度要求。

A Method for Calibration of Electronic Current Transformer

A method based on the sampling measurement technology for calibration of electronic current transformer with analog and digital outputs is described.The ratio and phase errors of the current transformer under calibration are determined as the difference between the two measurement values that are collected at the secondary of the calibrated transformer and of a reference transformer when the same signal is applied to their primary. The error of the method is thoroughly analyzed and the possibility is proved. A prototype of calibration system for electronic current transformer has been developed. The test that estimates the performance of the calibration system has been carried out in National Center for High Voltage Measurement. The tested results show that the system fulfills the requirements for calibrating current transformers for use with electrical measuring instruments and with accuracy class up to 0.2.