用于HVDC极线电流测量的光纤电流传感器

高压直流输电系统极线线路上的直流电流是高压直流输电系统运行、控制过程中的重要技术参数。由于直流线路中换流装置产生的叠加在直流线路上的谐波电流会干扰邻近的通信线路,这就要求电流传感器能提供准确的谐波电流信号给有源滤波器以有效地抑制谐波电流。基于此,研制了一种适用于高压环境下的光纤电流传感器,直流测量准确可靠,响应快速,谐波测量频带范围宽广,准确度高;介绍了光纤电流测量系统的原理、结构以及设计中采用的关键技术。

Optical Fiber Current Sensor for HVDC Pole Line Current Measurement

Direct current on the DC transmission pole line of the high voltage direct current(HVDC) project is one of the most critical technical data for supervising the operating conditions and system control.Harmonic currents,which caused by the converter in HVDC,superimpose on the direct current,and this will interfere the telephone & communication lines.In recent years,the possible interference has been more and more heavily restricted in the specifications of HVDC-schemes,which requires the current sensor to offer the accurate harmonic current signal to active DC filter to suppress interference effectively.For this reason,a new optical fiber current sensor suitable for high-voltage environment is designed to measure currents of HVDC pole line accurately.This paper describes its principle,construction and key technologies adopted in detail.