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Effect of pre-deposited surface charges on impulse flashover characteristics of a polymeric insulator is studied by means of computer simulations utilizing a model based on criteria for streamer inception, propagation and sustenance. A parametric study is performed to investigate the influences imposed by magnitude and polarity of the charge, its location on insulator surface and properties of insulator...
A 10-stage Marx generator has been used to apply voltages of up to 400 kV, with rise times in the region of 150 ns, to samples of polymeric insulating materials held between two electrodes immersed in transformer oil. The Marx is triggered by depressurisation of a spark column filled with dry air. Electrical fields of up to 500 kV/cm are applied across the electrodes, causing surface flashover of...
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