Research on transformer condition evaluation technology based on vibration signal analysis

Abstract

In order to analyze and judge the looseness defects of transformer core and winding, the causes and characteristics of core and winding vibration were analyzed theoretically. It could be seen that the resonance frequency and frequency spectrum distribution of vibration signals at different measuring points were not the same.The vibration signals of different measuring points of the transformer shell under the conditions of normal core and winding looseness and different degrees of looseness were tested experimentally. Then the method for judging the looseness defect of core and winding based on the content of fundamental frequency signal was proposed, which had advantage in effectiveness and convenience. Finally, the further research direction was pointed out to promote actual using.