Simulation study of partial discharge detection technology based on iron core induction

Ultra-high frequency (UHF) method of partial discharge detection has the advantages of high sensitivity and high signal-to-noise ratio, the existing external transformer sensors have low sensitivity, while the built-in sensors will affect the actual operation of the transformer, which limits the application of UHF sensors in the field partial discharge detection of transformers. For this purpose, it is proposed that the transformer core be employed as an UHF antenna for the purpose of detecting the electromagnetic signals generated by partial discharges. Three distinct transformer core configurations are selected for use as UHF antennas, and their respective models are developed and subjected to simulation. The antenna characteristic parameters of the core are simulated and calculated, and the results show that the core can be used as an antenna for partial discharge detection in the UHF range. The entire transformer is modeled, and the receiving characteristics of the core inside the transformer for UHF signals are simulated. The simulation results show that the iron core can sense the UHF signals generated by partial discharges well and play the role of detecting partial discharges.