Gas Discharge and Gas Insulation by Dengming Xiao

Author:Dengming Xiao
Language: eng
Format: epub
Publisher: Springer Berlin Heidelberg, Berlin, Heidelberg

6.1.3.3 Breakdown Characteristics in Uniform and Weakly Nonuniform Electric Fields

Because the breakdown voltage under operating impulse voltage also has dispersion, the 50 % breakdown voltage is used to represent the gas insulation strength. When considering about the insulation coordination, the volt-second characteristics should be used.

Duration of the operating impulse voltage is between that of the power frequency AC voltage and the lightning impulse voltage. In uniform and weakly nonuniform fields, the 50 % breakdown voltage of the operating impulse is actually equal to the 50 % breakdown voltage of the lightning impulse and the peak value of the power frequency AC breakdown voltage. Dispersion of the breakdown voltage of the opera ting impulse voltage is small, and the breakdown occurs at the peak point.

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