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This paper deals with PD current pulse waveforms of environmental friendly gases such as N2, CO2, dry air, and CF4 gas that were measured with the SHF_PDPW (Super High Frequency wideband PD current Pulse Waveform measurement) system. This specially developed system enables us to obtain accurately PD current pulse waveforms up to the SHF band (330GHz). When one discusses the UHF method for the insulation...
This paper investigates the sensitivity of two UHF sensors of a disc-type measuring electrode and a loop-type measuring electrode embedded in an epoxy insulator for detecting partial discharges (PD) and for diagnosing gas-insulated switchgear (GIS). The experimental results show that the disc-type electrode has a wide frequency range up to 8 (GHz), which is advantageous for detecting a particle on...
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