Study On Ultrasonic-based Method To Detect Partial Discharge In GIS

Measurement of partial discharge (PD) is an important means of monitoring the insulation condition and improving the reliability of power equipments. With regard to Gas Insulated Switchgear (GIS), investigation of acoustic based PD detection system was carried out.In the dissertation, following research in the PD on-line detection system was covered.1. Present status of PD detection in GIS was reviewed;2. Acoustic based PD detection scheme was proposed;3. Design and realization of the hardware of acoustic based PD detection system, including acoustic emission sensor, pre-amplifier, data acquisition system, etc;4. Design of the software of acoustic based PD detection system, including the frame of the software, flowchart of signal processing, PD evaluation rules, etc;5. Construction of PD detection set-up in the laboratory, including GIS experiment model, artificial defect, testing equipments, etc.At the end of this dissertation, a systematical summary is given. Further work to the research is pointed out.