Abstract
This paper decribes a high voltage laboratory testIng program of artificially dust-contaminated cap and pin insulators. Several factors are found to influence the flashover characteristics including : the method of voltage applications the rate of wetting of the contaminated insulators, and the duration of the high voltage test. The 50% o flashover voltage is found to be proportional to the number of insulator units per string while the relative dispersion decreases considerably for longer strings, Within the range investitated. Flashover characteristics of artificially and naturally contaminated insulators are compared. Due consideration is given to the statistical nature of the problem which determines the volume of the tests involved. Flashover values are shown to belong to a population characterized by a gaussian distribution and a procedure for optimizing the number of necessary tests is developed.
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