Japanese Method of Artificial Pollution Tests on Insulators

Abstract

Salt pollution on outdoor insulators has been a serious problem in Japan, and steady efforts have been made to prevent flashover faults on polluted insulators. As a part of such efforts, a simple method of artificial pollution test has been developed to evaluate the flashover characteristics of polluted insulators, especially those with large dimensions. In this test, a salt solution of various concentrations containing a certain amount of kaolin is prepared and sprayed on the entire surface of the insulator to give a required density of salt deposit and sufficient moisture.