A transformer is a device that uses the principle of electromagnetic induction to change AC voltage. The main components are a primary coil, a secondary coil, and an iron core (magnetic core). The main functions are: voltage conversion, current conversion, impedance conversion, isolation, voltage stabilization (magnetic saturation transformer), etc. It is a key device in the power system. Generally, transformers rarely fail. Once a certain defect occurs inside the transformer equipment, equipment failure is extremely easy to occur. Therefore, strengthening and improving the operation monitoring of transformer equipment is of great significance for ensuring the safe operation of transformers.