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Reference: ISH2017_441

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Partial discharge inception voltage measurement and its estimation by volume-time theory for SF6/PET insulated wedge gap under impulse voltage



Insulation properties of SF6 gas gap formed at the wedge gap of gas-insulated transformer has not been investigated well. So, the authors aim to study characteristics of partial discharge inception voltage (PDIV) of the wedge gap formed by two electrodes wrapped with polyethylene terephthalate (PET) film to simulate wedge gap insulation system of the gas-insulated transformer coil insulation. Applying a given magnitude of impulse voltage to a set of the electrode systems, discharge generation probability is obtained at different pressures (0.10, 0.22, 0.50 MPa) of SF6 gas. Partial discharge (PD) signal occurring at the wedge gap is detected using a number of 1 kO resistors connected in series of the electrode systems. An attempt is made to interpret these results in terms of the Volume-Time theory. It was found that the Volume-Time theory can explain the measured discharge inception probability quantitatively.

File Size: 824,5 KB

Pages NB: 6

Year: 2017

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