EQUIPMENT and methods used for the surge testing of distribution transformers at the engineering experiment station at Purdue University are described in this paper. The surge generator of 1,000 kv maximum and the cathode ray oscillograph used in these tests are described. Curves are presented to show the desirability of ultra-violet illumination of the sphere gaps, especially for the smaller gaps and shorter spacings.
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Harding et al. (1933) studied this question.