地下電纜為電力系統主要的設備之一，而局部放電則被視為電力設備絕緣狀態的指標，透過長期觀察設備局部放電現象，可即時得知其絕緣狀態。而地下電纜系統常見的事故，多發生於現場施工的電纜接續處，為提升電力系統的安全性、可靠度與供電的品質，本文針對配電級地下電纜接頭研製電能自給式局部放電監測系統。
本文提出的電能自給式局部放電監測系統，主要由局部放電信號處理器、數位信號處理器(TMS320F28335)與電能自給式電路所組成。藉由數位信號處理器控制局部放電信號處理器，進行量測、特徵計算、狀態評估與資料傳輸等功能。針對現場環境設計電能自給式電路，利用非接觸式感應饋電技術，擷取取電纜上的負載電流，透過後端電路進行電能轉換與儲存，作為局部放電監測系統的電力來源。
本文製作有瑕疵的電纜接頭作為試驗被試物，進行絕緣劣化試驗，應用本系統進行局部放電監測，得到的放電數據可說明本系統能有效辨識電纜接頭內部的局部放電信號；電能自給式電路透過模擬設備產出電纜電流進行試驗，於實驗結果可知當電纜電流達到40A以上即可使系統穩定工作，若低於此電流則可透過儲能裝置進行搭配，達成長期監測之目的。

Underground cable is one of the main equipment in power system, and the partial discharge (PD) measurements provide valuable information for insulation status assessment of high voltage equipment. Therefore, the long-term monitoring of PD can be immediately informed of insulation status. Because the underground cable system accidents usually results from site construction of cable joint. In order to ensure security, reliability and quality of power system, this thesis developed of self-energized partial discharge monitoring system for underground cable joint.
This system structure in this thesis can be divided into two parts, one is partial discharges monitoring unit (PDMU), which responsible to partial discharge signal measurement and data computation and transmission. The PDMU consists of partial discharge signal processor (PDSP) and digital signal processor (DSP), TMS320F28335. The other is self energized circuit, using non-contact induction feed technology and power electronics technology for energy conversion and storage, as a PDMU device power supply.
The thesis utilized defective cable joints as experiment objects. Application of the system for monitor, the experimental data shows that the partial discharge of cable joint can effectively identified. The self-energized circuit tested by simulation equipment, the experimental result shows that the monitoring device minimum stable operating current of cable is 40A. According to experiment mentioned above, it prove that the system can be long-term monitoring partial discharge of cable joint.

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