Diagnosis on Winding Failure Through Impulsive Sound of Power Transformer

The transformer windings will flow a large impact current in the event of an external short circuit, causing strong vibration, resulting in winding looseness and deformation. Therefore, it is of great significance to carry out the research on fault diagnosis under short-circuit impact. The sound signal can reflect the overall mechanical condition of the equipment. According to the characteristics of the impulsive sound signal in time-frequency domain, two fault parameters like sound entropy (SE) and odd-even ratio (OER) were proposed. It is found that the SE and OER increase when the winding loosens, while they decrease when the deformation occurs. The deviation of parameters can reflect the degree of mechanical failure. According to the proposed fault parameters, a diagnosis on winding failure through the impulsive sound of the transformer is proposed.