±500 kV电子式直流电流互感器设计及检验

介绍了一种适用于±500kV高压直流系统的电子式直流电流互感器。与传统直流互感器采用的电磁感应原理不同,该互感器采用分流器+罗氏线圈+光纤传输模式,由分流器测量直流电流,罗氏线圈测量谐波电流,将光纤复合绝缘子作为光信号传输通道,利用光纤传导技术解决了传统测量技术中高低压间信号隔离的难题,通过温升和精度试验证明了该互感器的主要技术参数满足高压直流电流测量系统设计指标。

Design and Test of Electronic Current Transformer in DC±500 kV

This paper introduces a new-type electronic DC current transformer used in ±500 kV HVDC system. Different from the principle of traditional DC measurement system, combination scheme of shunt, Rogowski coils and fiber-optical transmission is adopted to design the new-type current transformer. The DC current is measured with shunt and the harmonic current is measured with Rogowski coils. The compound fiber-optical insulator is taken as the channel of signal transmission. Problem of the signal isolation between the high and low voltage in traditional measurement techniques is solved with fiber-optical transmission technology. Finally, the main technical parameters of the current transformer are proved to meet the design target of the HVDC current measurement system by precision and temperature rising test.