隨著城鄉建設的發展，以架空被覆線路為主的郊區或偏遠地區之配電方式，其架設規模亦逐漸擴大，但因天然、環境、材料或人為疏失等因素，皆可能導致架空被覆線路斷落後的接地短路，其故障電流會隨接地阻抗的特性而異，有時傳統之過電流保護方式皆難以偵測，以致斷落於地之高壓導線或其伴隨之電弧閃絡，將對人員、動物或環境造成莫大之危害。本論文基於小波轉換理論與類神經網路，開發出適用於輻射型配電饋線末端設備(FTU)中之高阻抗偵測器，主要是利用3I0零序電流作為偵測高阻抗接地故障之依據。首先，應用小波轉換理論解析出高阻抗故障特徵訊號，再將此特徵信號透過類神經網路加以分類辨識，若判斷出高阻抗故障，即可產生識別訊號，經由饋線末端設備傳送至遠端配電調度中心，整體偵測架構具有分辨高阻抗故障類型及故障所在區段之功能。本文高阻抗偵測器分別透過實際饋線人工故障試驗資料，與高阻抗數學模型故障模擬資料進行訓練，最後，經由Matlab/Simulink模擬與Doble波形重現模擬器，重現真實高阻抗接地故障訊號並進行測試，結果顯示高阻抗故障偵測器可準確偵測各類型高阻抗接地故障，具有實際應用之價值。

Along with the development of urban or suburban areas, the scale of electrical infrastructure which mainly as overhead distribution line has been gradually expanded. Unfortunately, the overhead distribution line may broke or falling down due to natural disaster, environmental issues, material degradation or human error. However, the fault current is mainly dependent on grounding impedance characteristics. Most of time the current is so small that the fault condition shall hard to detect by exists protection relay. Usually, the falling down conductor may create an arcing once touch with ground. This arcing would danger living life or cause fire.
This thesis has been successfully developed an intelligent high impedance fault (HIF) detector for using in Feeder Terminal Unit (FTU). Generally, the zero-sequence current (3I0) is introduced to detecting HIFs. The wavelet transform is used for analyzing HIF feature signal and the back-propagation neural network is used for identification. If the HIF is detected by detector, the FTU will issue an identified signal and transmitted it to the remote side of distribution control center. As a result, not only the HIF fault can be detected but also the fault zone also will be located.
First of all, the intelligent HIF detector will be intensively trained by using some of actual test data in field and Matlab/Simulink simulation data. Then, The Matlab/Simulink simulation and Doble waveform reproducer are introduced to reproduce the recorded waveform of actual HIF grounding fault current for test. Finally, the test results show that the intelligent HIF detector can accurately detect various type of HIF grounding fault with high accuracy. It proves that the proposed detector have highly application value.

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