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Partial Discharge (PD) is considered to be one of the main reasons for aging and degradation of the oil/pressboard insulation system in power transformers. Vegetable oils which own excellent dielectric performance are introduced as potential insulation liquids substituting traditional mineral oil. In this paper, an air-gap PD model was adopted to investigate the PD characteristics of refined rapeseed...
The operation data obtained abroad indicates that shielding failure in AC UHV transmission system mostly accounts for the tripping-out accidents introduced by lightning striking the transmission line. Based on the discharge theories of long air gap and randomness theory, a leader progression model of lightning shielding failure is presented in this paper. The simulation results shows the good agreement...
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