Evaluation method and apparatus for judging electromechanical state of transformer using wideband vibration feature

An evaluation method for judging an electromechanical state of a transformer using a wideband vibration feature, comprising:

• receiving a wideband detection signal collected by a sensor for a target transformer, performing filtering processing on the wideband detection signal based on a filter, to obtain a wideband vibration signal, and sampling the wideband vibration signal and a power-frequency voltage in real time, to obtain a wideband sample signal and a voltage sample signal;
• performing Fourier decomposition and reconstruction on the wideband sample signal, to obtain a low-frequency diagnostic signal and a high-frequency diagnostic signal that correspond to the target transformer;
• processing the low-frequency diagnostic signal based on a mechanical diagnostic policy, to obtain a fault signal eigenvalue, and obtaining a mechanical fault result according to the fault signal eigenvalue;
• and
• processing the high-frequency diagnostic signal according to a partial discharge diagnostic policy, to obtain a phase resolved partial discharge diagram, and obtaining a partial discharge fault result based on the phase resolved partial discharge diagram.