Nondestructive testing of the quality of winding impregnation in electric machines

Abstract

The topicality of this work is accounted for by a need to upgrade the evaluation of the quality of winding impregnation in electric machines and to raise their safety margin and reliability. Our goal is to substantiate the possibility of using the measured capacitance of the winding of an electric machine (with respect to its magnetic core) for testing the impregnation of cavities in the major insulation and assessing metrological characteristics of the proposed testing technique. Methods of electric measurements for studying the capacitance characteristics of electric-machine windings, formulae for calculating the dielectric constant of binary mixtures, and techniques for assessing the errors of indirect measurements have been used.