局部放電為絕緣體質發生放電而未發生閃絡之現象，局部放電與電氣絕緣之故障有關聯，局部放電也是絕緣老化與故障之主要原因，其通常伴隨著產生聲音、光、熱、電流脈衝、電磁波、化學反應等現象。在本文中之偵測方法是攫取局部放電之電磁波訊號。為了探討電氣設備故障之放電特性，製作四種故障模型如：故障模型1(金屬尖突)、故障模型2(金屬微粒)、故障模型3(浮動電極)、故障模型4(絕緣表面放電)，對每一種故障施加五種電壓(16kV、17kV、18kV、19kV、20kV)，試驗過程依據IEC60270標準，以頻譜分析儀記錄局部放電之頻譜，所有的實驗都在金屬屏蔽之試驗場中完成，最後分析與歸納每一種故障類型之放電特徵。

The partial discharge is a phenomenon that a discharge does not bridge in an insulation material. It has a relationship between partial discharges and the failure of electrical insulation. Partial discharges are the major reason for the aging and failure of an insulation. It is usually accompanied by some phenomena such as voice, light, heat, electrical current pulses, electromagnetic waves, chemical changes. In this paper, the detection method is to capture electromagnetic waves of partial discharges. In order to investigate the partial discharge characteristics of the failure in an electrical equipment. We manufacture four kinds of defect models, such as defect model 1(fixed protrusions), defect model 2(free particals), defect model 3(floating electrodes), defect model 4(insulator surface discharge). Five kinds of voltage (16kV,17kV,18kV, 19kV,20kV)applied to each fault mode. Test procedure according to standard IEC60270. Recording partial discharge phenomena of fault models in the frequency domain. Finally, to do the analysis and conclusion of partial discharge characteristics of each fault model.

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