Abstract
Surface charges accumulated on the polymeric insulating materials play a crucial part in determining the performance of those materials. This paper presents the mechanism of surface charge accumulation on polymeric insulator and its influence on flashover voltage of the insulator under positive polarity lightning impulse voltages. The needle- plane electrode geometry is used to simulate the surface charge production and accumulation mechanisms due to corona. Later, the identified charge distribution with known charge density is pre-deposited in the various locations of the sample insulator with a single weather shed and lightning impulse flashover voltage is computed using streamer criteria. The flashover characteristics show a strong dependency on polarity, magnitude and location of the surface charges. The computed results are evaluated based on electric field distribution and the flashover voltage computation method is validated with experimental results.
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