THE SYSTEM AND METHOD FOR DETECTING THE STATE OF THE TRANSFORMER WINDING BY UTILIZING EXCITATION OF THE CONSTANT CURRENT SWEEP FREQUENCY POWER SOURCE

摘要

A system and method for detecting the state of the transformer winding are provided by utilizing excitation of the constant current sweep frequency power source. The method includes the following steps: the measuring and controlling and analyzing module controls the sweep frequency power source to apply outputted constant current and sweep frequency exciting signal on high voltage side of the measuring transformer from an excitation transformer; the vibration transducer measures the vibration response signal of the measuring transformer under different exciting frequency; the vibration signal sampler samples and pre-processes the measured signal from the vibration transducer; the measuring and controlling and analyzing module perform frequency spectral analysis on the received vibration signal which is after-treatment; the resonance frequency curve of the transformer winding in frequency domain is displayed and recorded, and compared with the resonance frequency curve measured and recorded previously and the vibration frequency curve of three phase coils of the transformer to judge the state of the transformer winding.