Ultra-high-frequency partial discharge detection with scanning and comparing method

This paper proposes a novel UHF PD monitoring system, which is based on the scanning and comparing method. It does not need to record the complete signal waveform. This system is constituted by the high-frequency filter and amplifier, the field programmable gate array and high-frequency comparator, which realizes signal digitizing in-field and the partial discharge features extraction, and transmits data to the host computer via Ethernet. This paper describes the basic principle and components of the UHF Scanning System, and the detected signal is analyzed too. And PD is detected using this UHF monitoring system in the laboratory and field. Experiments and field results show that in addition to the PD characteristic parameters can be obtained, the system can extract spectrum and real-time monitor PD phenomena.