摘要
局部放电检测可及早发现电气设备的绝缘缺陷,为状态检修提供依据。目前,各种检测方法仍难以解决抗电磁干扰能力差的问题。提出将基于Faraday磁光效应原理研制的双螺线管结构光学电流传感器应用于局部放电检测,丰富了局部放电检测的内容,突破了现有检测方法的局限性。建立了4种局部放电模型,利用马吕斯定律和安培定律研究了传感器光路损耗特性和抗电磁干扰性能,采用连续小波变换对光学电流传感器采集的局部放电信号进行了时频分析。与其他检测方法的比较结果表明,该传感器系统具有良好的使用特性,为今后光学方法在局部放电检测中的应用奠定了基础。
The partial discharge （PD） measurement is an effective technique for the detection of insulation defects and provides data on the condition maintenance. On-line PD measurement is currently affected by the electromagnetic interference, which makes sensitive PD detection very difficult. In this paper, an optical current sensor based on the Faraday magneto-optic effect with a double solenoid structure is applied in the PD detection, enriching the content of the PD detection and breaking through the limitations in the current method. Four PD models have been developed, and the characteristic of the optical path loss and the anti-interference capability of sensor are studied using Malus＇ law and Ampere＇s law. The continuous wavelet transform theory is used to analyze the time-frequency characteristic of PD signals. The comparison results with other sensors show that the optical current sensor has superior performance, providing a basis for further application of the optical method in PD measurement.
出处
《电力系统自动化》
EI
CSCD
北大核心
2008年第16期66-71,共6页
Automation of Electric Power Systems
基金
国家自然科学基金资助项目(50777048)~~
关键词
局部放电
电磁干扰
Faraday磁光效应
光学电流传感器
双螺线管结构
连续小波变换
partial discharge
electromagnetic interference
Faraday magneto-optic effect
optical current sensor
double solenoid structure
continuous wavelet transform
