光纤传感技术用于检测地下电力电缆故障

The Application of Optical Sensing Technique in Fault Detection System for XLPE Underground Power Cables

依据 Faraday效应的光学磁场传感器用于地下电力电缆故障电流的检测 ,能检测出接地故障电流的幅值、相位并确定出故障段用光纤传输信号 ,避免了接地故障电流 (50 0 0～ 5 0 0 0 0 A)引起的电磁感应对测量结果的影响。光学磁场传感器和故障段检测器 /显示器之间的最大无中继距离为1 0 km。

The application of optical fiber technique in fault section detection system for XLPE insulated underground power cables is introduced in this paper. In case of ground fault, the system detects the fault current and determines the fault section from the magnitude and phase information of the fault current. Optical magnetic field sensors based on Faraday effect are used for detection of fault current, and optical fiber are used for signal transmission to eliminate effects of electromagnetic induction. The distance between an optic magnetic field sensor and the fault section detector/indicator can be as long as 10 km without the use of any repeaters.