Objective In response to the problem that the existing single physical field model and two-two coupling model are not accurate enough to study the overall temperature field distribution of defective high-voltage cable terminals,the multi-physical field finite element coupling model of electromagnetic field,solid heat transfer field and fluid heat transfer field considering the influence of load current was proposed.Methods The temperature field distribution characteristics of 110kV cable terminals with oil leakage and silicone oil degradation defects were studied by the model.Results In the simulation,the temperature inside the terminal rose significantly,with the in-crease of load current,and the temperature from the core to the umbrella skirt decreased gradually.The oil leak-age defect caused the temperature stratifying of the outer surface of the terminal with the temperature of the air domain lower than that of the silicone oil domain,and the degradation of the silicone oil made the terminal to heat up locally,resulting in an increase of the maximum temperature near the stress cone on the outer surface.Conclu-sion In practical application,the error between the model's results and the actual values is within 1％,and the study clarifies the feasibility of using the overall temperature distribution characteristics to monitor the common defects of terminals in practical application.
high voltage cable terminalsoil leakagesilicone oil degradationtemperature field simulation
维普
万方数据
