Research on Online Detection Method of Transformer Winding Deformation Based on VFTO Characteristics

At present, most of the winding fault detections transformers use offline methods, which require entire line to be powered off or after transformer has been shut down due a serious fault, and they cannot detect running status windings in real time online. Since will impacted by VFTO during operation, is used as excitation, basic principle frequency response method propose an online detection deformation based on characteristics. The finite element software calculate equivalent circuit parameters normal deformed windings, model before established. Due uncertainty waveform, combined with method, waveform injected into health, curve obtained from circuit, analyze change resonance point case radial deformation, axial displacement winding. simulation results show that can comprehensively reflect information same time, feasibility verified experiments.