地下電纜是電力輸配電系統中的主要設備，由於目前供電吃緊任何電力設備事故將影響人民生活與經濟損失，因此長期監測設備的局部放電越為重要。而局部放電在國際上已成為評估電力設備絕緣狀態的重要指標，因此本文針對配電級的地下電纜接頭研製一套具絕緣狀態評估機制的線上局部放電監測系統。
本文提出的線上局部放電監測系統，由量測單元、類比訊號處理器、TMS320F28335數位信號處理器與電能自給式電路組成，配合多工器切換與電壓零點偵測可監測三相電纜接頭，並將診斷規則導入至局部放電監測單元進行線上監測，透過定時的量測與傳輸建立資料庫，即時評估電力設備的絕緣狀態，並搭配人機介面展示與分析，適時發出警示告知維修人員。
本線上局部放電監測系統有實際應用於兩個含有人工製作瑕疵的電纜接頭，並進行交流耐壓試驗直到絕緣破壞為止，相關數據與實驗室既有的局部放電檢測系統比較得知有相同的趨勢，故可驗證本系統具備相同性能。
關鍵詞：局部放電、電纜接頭、狀態評估、線上監測系統、數位訊號處理器

The underground cable is the main equipment in the power transmission and distribution system. Due to the current low power reserve capacity, any accident event on electrical equipment will affect people’s lives and cause economic losses. It is more and more important to have long-term monitoring on the partial discharge (PD) of the equipment. PD has become an international recognized index for assessing the insulation status of power equipment. Therefore, this thesis developed an on-line monitoring system with insulation status assessment scheme for power cable joints.
The on-line PD monitoring system consists of measuring unit, partial discharge signal processor (PDSP), TMS320F28335 and self-energized circuit. With multiplexer switching and voltage zero detection, the system can monitor the joints of three-phase cable, and the diagnostic rules will be imported into the partial discharge monitoring unit (PDMU) for on-line monitoring. Database is established through regular measurements and transmissions to assess the insulation status of the power equipment in real time, timely raise alerts to maintenance personnel by HMI.
The on-line PD monitoring system has been applied to two cable joints that contain artificial defections, and the AC withstand voltage test is performed until the insulation is destroyed. The relevant data from the system is known to have the same trend with the data from the existing PD detection system in the laboratory, thus the system is proved to have the same performance.
Keyword: partial discharge, cable joint, insulation status, on-line monitoring system, digital signal processor

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