電氣設備長期運轉之下，絕緣材料特性會因不同外在因素影響逐漸劣化，當劣化部位之電場強度大於絕緣材料本身所能承受的絕緣強度時，即會產生局部放電(Partial Discharge, PD)現象。雖然局部放電可能使絕緣劣化而導致損壞，然其劣化發展需一段時間，其發展時間與設備本身運轉狀況、PD位置與設備的絕緣結構等因素有關。若能運用局部放電檢測裝置測量局部放電信號，並進一步分析設備絕緣狀態，應能避免設備無預警崩潰，降低故障發生。
本研究旨在研製一套局部放電訊號偵測裝置，主要整合高速類比數位轉換器、快速擷取傳送及場效可程式邏輯閘陣列(Field Programmable Gate Array，FPGA)儲存傳送三塊模組。主控台負責下達給各個模組指令，功能為資料的儲存接收和運算判斷；高速類比數位轉換模組負責將擷取到的類比訊號轉換成數位訊號；快速擷取傳送模組負責將擷取到的資料透過USB快速的傳送到主控台；FPGA儲存傳送模組負責將快速大量擷取的訊號暫時儲放再傳送到主控台。擷取訊號後判斷信號是否為PD訊號，確定後計算局部放電電壓最大值、平均放電量和放電次數。為驗證所提出局部放電偵測裝置之可行性，本研究設計不同案例，與Teledyne LeCroy WaveRunner 610Zi示波器和NI的工業電腦作分析與比較，結果顯示本裝置對於高達50MHz，仍能有效偵測局部放電信號。

When the electrical equipment is in long-term operation, the insulating material characteristics deteriorate gradually under the effect of different external factors. When the electric field intensity in the deterioration position is higher than the allowable insulating strength of the insulating material, the Partial Discharge (PD) phenomenon is generated. The PD may deteriorate insulation causing damage, but the deterioration development takes a while. The development time is related to the equipment operating condition, PD position and insulation structure of equipment. If the PD signal can be measured by using PD detection device, and the equipment insulation state is analyzed, the unwarned equipment breakdown may be prevented, the fault occurrence is reduced.
This study aims to develop a PD signal detection device, integrated with high speed analog-digital converter, rapid capture transfer and Field Programmable Gate Array (FPGA) storage transfer modules. The master station issues instructions to various modules, so as to store, receive, calculate and judge data. The high speed analog-to-digital conversion module converts the captured analog signal into digital signal. The rapid capture transfer module transfers the captured data via USB to the master station rapidly. The FPGA storage transfer module stores the rapidly captured signals temporarily and sends them to the master station. If the captured signal is identified as PD signal, the maximum value of PD voltage, mean discharge and numbers of discharge are calculated. In order to validate the feasibility of the proposed PD detection device, different cases are designed in this study, and compared with Teledyne LeCroyWaveRunner 610Zi oscillograph and NI industrial computer. The results show that this device can detect as high as 50MHz PD signal effectively.

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