Study on temperature distribution in oil-immersed inverted current transformer

Abstract

Oil-immersed inverted current transformer, as an important electrical equipment in power grid, is mainly used in power plants and substations. Accidents caused by oil-immersed inverted current transformers are generally accompanied by explosions, which not only reduce the amount of electricity delivered, but also damage other nearby equipment in the substation and even cause casualties. Therefore, it is very necessary to detect and evaluate the operation status of oil-immersed inverted current transformer and study the fault prevention technology to reduce the probability of accidents. According to the common faults of oil-immersed inverted current transformer, this paper firstly analyzed the parts and components with high fault rate of current transformer. Combined with the operating condition of current transformer and its internal insulation structure, the internal temperature field simulation model of current transformer and the temperature calculation model of key parts were established. It was found that the temperature near the winding of the oil-immersed inverted current transformer was the highest, while the temperature rise at the lower part far from the heat source was very small. The simulation results were basically consistent with the experimental results, and it was found that the temperature distribution on both sides of the primary conductor in the head region of the current transformer was symmetrical.