對於地下電纜系統的維護而言，發展線上監控系統，不但可節省人力成本，也能有效與多元地管理電力電纜絕緣系統，進而提升電力系統的安全、可靠與品質。由於地下電纜常見的事故，多在需要人員施工的電纜接續部份，本文以配電級地下電纜接頭為設計對象，研製線上監控系統。
線上監控系統中的局部放電信號處理技術，由既有的個人電腦架構化簡為數位處理器架構，以建構簡單、有效與可靠的系統，達到廣泛實用的價值。線上監控系統的架構分成硬體的量測單元、監測單元、傳輸單元與監控電腦；軟體的信號擷取、濾波、特徵值、趨勢分析與絕緣狀態評估。
本文利用有瑕疵的電纜接頭，做為系統的試驗被試物，由試驗的數據與被試物擊穿的瑕疵位置，可以說明本系統可有效辨識電纜接頭的內部局部放電信號與提供評估絕緣狀態的分析資料。

For the sake of maintenance for the underground cable system, it is an essential to develop an on-line monitoring system. In addition to save the manpower cost, it can effectively manage the electric insulating system of cable, so as to improve security, reliability and quality of the power system. Because the common underground cable system accidents usually results from on-site cable accessories which are assembled by the personnel, this thesis selects distribution cable joint to develop the on-line monitoring system.
This thesis establishes a simple effective and reliable on-line PD monitoring system via DSP, instead of adopting the computer-based signal processing method structure. The implementation of on-line monitoring system structure can be divided into two parts: 1) hardware: measuring unit, monitoring unit, transmit unit and PC; 2) software: signal acquiring, filtering, characteristic value, trend analysis and insulating state estimating.
This thesis utilizes a defective cable joint as an experimental object. The experimental result shows that the proposed on-line monitoring system can exclude noise from measured PD signal and offer a variety analysis data for assessing the insulation status.

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