Propogation characteristics of PD-induced UHF signal in 126 kV GIS with three-phase construction based on time–frequency analysis

Partial discharge (PD) detection of the gas-insulated switchgear (GIS) is an effective method for substation security. The GIS with three-phase construction is widely used for substations. The propagation characteristics of PD-induced ultra-high-frequency (UHF) signal in three-phase GIS is investigated in this study by time–frequency analysis method. The variation of peak-to-peak value (V pp) and cumulative energy, and especially the energy density in the time–frequency plane are used to represent the feature of the UHF signal. Furthermore, the different situation of the insulation defects and the detection point positions are compared, and the reason for the difference is explained as well. As a result, this study identified a novel method to determine the PD source position in the GIS with three-phase construction.

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