| Summary: | 碩士 === 國立成功大學 === 電機工程學系碩博士班 === 94 === Transformer and gas insulated switchgear (GIS) breakdown is usually caused by the malfunction of the insulation, giving rise to partial discharge (PD). We design a simple discharge detector for power equipment monitoring using acoustic emission (AE) technique. The frequency of AE signals generated form PD is around 20 to 80 kHz. Hence, general electric components can be used to build a detector, easily causing tens of thousands to millions priced detecting equipments to reduce their costs. At the same time, we also designed an AE-PD signal waveform simulator, paving for convenient development of the AE detector. Using LabVIEWTM language and data acquisition board, paired with self-developing interface and digital/analog signal convert control, we can build a set of AE signal waveform simulator applicable to a PD detector. This research uses AE signal waveform simulator to reconstruct AE signal and use the signal to test the simple PD detector. The detector uses an AVR microcontroller as the systematic control unit. The AE signals are transformed into square-wave signals by a comparator and then transmitted to a microprocessor, and a timer/counter inside the microprocessor is provided to count the times of PD events. It shows the number of PD events on a LCD so as to determine whether the power equipment needs to be maintained or not and prevents it from breakdown.
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