The fact that the dielectric strength of liquids is higher than that is for dielectric solids at the times of voltage duration less than lps was founded at Tomsk Polytechnic University at the end of the fiftieth. Fig.1 illustrates the dependence of the breakdown voltage Uw to the time of voltage acts t~ (time of voltage increasing till the coupon breakdown) for several materials. It can be of transformer oil and tap water is higher than that is for quartz, marble and sandstone to the left of volt-time characteristics crossing.

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