开关类设备局部放电光脉冲与特高频脉冲特性对比研究

A Comparative Study on Characteristics of Partial Discharge Optical Pulse and UHF Pulse in Switch Equipment

探究了新型硅光电传感器在局部放电检测方面的性能,并将其测得的光脉冲与传统特高频脉冲进行了对比试验分析。通过光、电同步局放试验,对各种传感器的检测性能、工作特性和统计特征进行了分析和讨论,探索了硅光电局放传感器在实际放电监测中的优势及可行性。此外,通过光、电同步监测数据分析,获得了局放光辐射与电磁辐射两种物理现象的统计学表现。结果表明,与特高频传感器相比,处在最佳工作电压下的硅光电传感器有着更高的信噪比;两种光学检测手段在高频电机的电磁干扰下,硅光电传感器体现出更好的抗电磁干扰能力;两种检测手段获得的PRPD图谱所反映的放电相位区间与放电特征都保持较好的一致性;脉冲重复率随施加电压的变化趋势一致,但硅光电传感器具有较高的信噪比和单光子灵敏度,得到的光脉冲统计频次相对局放电磁脉冲频次较高,并且相基统计数据中的偏斜度和陡峭度也具有较好的一致性。

This article explores the performance of the new silicon photoelectric sensor in partial discharge detection,and compares the measured optical pulse with the traditional UHF pulse.Through optical and electrical synchronous partial discharge experiments,the article analyzes and discusses the detection performance,working characteristics and statistical characteristics of various sensors,and explores the advantages and feasibility of silicon photoelectric partial discharge sensors in the actual discharge monitoring;In addition,the statistical performance of the two physical phenomena of partial light radiation and electromagnetic radiation is obtained through the analysis of optical and electrical synchronous monitoring data.The result suggests that compared with UHF sensor,the silicon photoelectric sensor under the optimal working voltage has a higher signal-to-noise ratio(SNR);under the electromagnetic interference of the highfrequency motor,the silicon photoelectric sensor exhibits better anti-electromagnetic interference ability;discharge phase interval and characteristics reflected by the phase-resolved partial discharge(PRPD)obtained by two detection methods maintain good consistency;pulse repetition rate has the same trend with applied voltage,but statistical frequency of optical pulses obtained is higher than that of electromagnetic pulses because the silicon photoelectric sensor has a higher SNR and single-photon sensitivity.The skewness and steepness in the phase-based statistics also have good consistency.