Simulation of Temperature Distribution in Current Transformers with Current Flow

摘要

On-site experience suggests the possibility of condensation of the moisture in Current transformers (CTs) which is impossible theoretically if temperature distribution in the CT is uniform.In order to study the temperature distribution in a typical CT,finite element analysis software (COMSOL Multiphysics) is used to obtain the temperature distribution of the outer surface and inside of SF6 in CT in different ambient temperatures (20 °C to-10 °C).Besides,experiments are conducted to obtain the temperature of different positions on the CT surface that correspond to conductor,shell,spacer and porcelain bushing that are inside the CT with different ambient temperature.Both simulation and experiments show that temperature distribution in the CT is non-uniform,and the closer the part is to the conductor,the higher the temperature.Furthermore,maximum temperature difference remains about 35 °C in both simulation and experiments with different ambient temperatures from 20 °C to-10 °C.