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Insulator Flash-Over in SF6 Gas

机译：sF6气体中的绝缘体闪络

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Flash-over along solid insulators in SF6 was studied experimentally. The breakdown voltage was measured under different experimental conditions; the parameters varied were: the voltage source (AC, DC and lightning impulse), gas pressure, electrode distance, charge condition of the insulator surface (positively charged, negatively charged or uncharged), insulator material (epoxy resin or Teflon-PTFE) and insulator shape (cylindrical or conical). Special attention was paid to the deposition, measurement and decay of surface charges on insulators. The modification of the applied electric field by surface charges was computed. Experiments with an image converter camera showed that photons play an important role in the flash-over mechanism. Measurements of the quantum yield of photo-emission can contribute to the formation of avalanches. A new model for time-dependent growth of an avalanche near an insulator is presented. The model takes into account field disturbances caused by surface charges. Comparison between this model and measured avalanche currents yielded values for a photo-emission coefficient. The surface damage to an insulator after flash-over was also investigated.

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