Research on Mechanical State Evaluation Method of Transformer Winding Based on vibro-acoustic Signal Fusion under Short-Circuit Impact

A mechanical state evaluation method of transformer winding based on vibro-acoustic signal fusion under short circuit condition is presented in this paper. The special analog transformer A phase winding is studied. Transformer internal vibro-acoustic mechanism is analyzed, then the three transient vibro-acoustic characteristic is defined and extracted. The short circuit impact test platform of transformer winding is established and 22 short circuit impact tests are carried out. The transient vibro-acoustic signal of transformer and the state of winding after short circuit impact are analyzed. The results show that the damage of transformer winding under short-circuit impact is a process of accumulation, and transient vibro-acoustic signal can reflect the mechanical state of transformer winding sensitively. Finally, the SVM algorithm is used to classify the transient vibro-acoustic characteristic, which can effectively distinguish and accurately identify the different mechanical states of transformer winding. The evaluation method is innovative to evaluate the mechanical state of transformer winding.