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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。
Partial Discharge Detection Early detection of insulation defects of electrical equipment, provide the basis for the state maintenance. At present, various detection methods are still difficult to solve the problem of poor anti-electromagnetic interference ability. Proposed based on Faraday principle of magneto-optical dual-coil optical current sensor developed for partial discharge detection, enriching the content of partial discharge detection, breaking the limitations of existing detection methods. Four partial discharge models are established. The optical path loss characteristics and anti-electromagnetic interference performance of the sensor are studied by using Marius’s law and Ampere’s law. The partial discharge signals collected by the optical current sensor are analyzed by using continuous wavelet transform. The results of comparison with other detection methods show that the sensor system has good performance and lays the foundation for the application of optical method in partial discharge detection in the future.