Abstract
Liquid development method of electrophotography was applied to the study on figures of discharge on the surface of dielectric plate in liquid insulators. The experiments were carried out with non-uniform electrode configurations, applying the standard impulse voltage, and voltage-current characteristics also were measured in various kinds of liquids.
According to the results in this work, it was found that, in order to obtain the discharge figure in liquid, it was necessary to use a dielectric plate which had high leakage resistance and higher dielectric constant than that of liquid insulator used, and that a phenol resin plate was the best material for the purpose of taking a discharge figure in insulating oil.
By employing this technique, it became possible to obtain a clear figure easily and to know the distribution and polarity of the residual charges, which were formed on the surface of the dielectric plate when an intensive discharge took place by high electric stress.
