本論文之主要目的在設計簡易型局部放電量測電路，此量測電路使用在以音射法檢出低電壓旋轉電機所產生之局部放電信號。因使用PWM變頻使旋轉電機暫態端電壓高於2-3倍額定電壓，造成局部放電。傳統旋轉電機局部放電的量測大多使用電氣法，也就是使用耦合電容、檢測阻抗、或是高頻比流器等方法量測線路上因局部放電所產生的高頻電流成分。但在實際旋轉電機的運轉現場，卻充斥許多高頻雜訊，導致訊號不易量測。因此為求提高訊號雜訊比，紛將頻段移往高頻，這也意味著其電路成本，與後端分析儀器成本將大幅提高。我們使用音射法量測低電壓旋轉電機中的局部放電信號，主要是因為音射信號頻率只有數百千赫(kHz)，遠比電氣量測法所需的數十至數百 MHz的頻率低許多，可以大幅降低整體量測成本。此外因為所量測的訊號為音波信號，非電氣法所量測之射頻電波，因此可大幅減低現場高頻雜訊的干擾。經實際驗證，本研究所發展的簡易型局部放電量測系統可以正確檢測出低電壓旋轉電機所產生之局部放電信號，其最大優點在於與傳統檢測法比較，可以大幅降低成本。

In this paper, we develop a simple detection circuit which using the acoustic emission (AE) technique to examine partial discharge (PD) signals from low-voltage rotating electrical machines. Most of traditional PD measurement methods use electrical techniques, namely, capacitive coupling (CC), RLC circuit, or high-frequency current transformer (HFCT), to examine the high-frequency electrical signals produced by partial discharge. To reduce the effect of noise from environment and improve the signal-to-noise ratio (SNR), higher frequency detectors are used. However, it means the cost of hardware and instruments will increase. The frequency of signals from AE measurements is in the range from several kHz to hundreds kHz. It is much lower than the signal frequency of electrical methods (several hundred MHz). So, the AE method can substantially reduce the cost of the whole system. In additional, since AE signal is acoustical, it can be easily kept away from the interference of high frequency electrical noises. From the practical experiment results, the measurement system developed in this work can be used to detect the PD-AE signal correctly. When compare with traditional methods, the AE technique exhibits a potential for low-cost PD measurement.

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