Study on Gas Diffusion Distribution Law of Inverted Oil Immersed Current Transformer

Abstract

Oil-filled equipment such as inverted oil-immersed current transformers, etc., during operation, due to electric field, magnetic field, etc., the insulating oil will oxidize, crack and carbonize, causing some CH bonds and CC bonds to break through complex chemistry. The reaction is recombined to form gases such as CO, CO2, and H2. Because in the study of inverted oil-immersed current transformers, the gas generated by the head due to fault can only be detected by chromatographic analysis of the oil sample taken at the bottom of the transformer. Therefore, in order to study the law of gas diffusion from generation to stable diffusion in insulating oil, the gas diffusion distribution rule of 65kV inverted oil-immersed current transformer model was established by COMSOL simulation platform, and finite element analysis method, Multiphysics coupling analysis method were used to build the physical model and at the same time, to verify the experiment. The experimental and simulation results are mutually verified, and the diffusion distribution law of gas in insulating oil is obtained. The calculation model of gas diffusion distribution of current transformer is established, which provides a new idea for the maintenance of related equipment.