In hot and humid condition

the power composite grease applied on the electrical connection of power transmission and distribution equipment has aging acceleration

resulting in abnormal heating.The high current temperature rise test at the bus connection of the 10 kV incoming line is performed in this paper

the temperature rise characteristics at the bus connection under different current conditions are studied. It is found through curve fitting that the relationship between temperature rise and current is roughly quadratic function. The analytical formula of temperature rise and time of copper bar can be obtained by exponential function fitting. It can be found by analyzing the temperature rise curve before and after applying the connection part with electric composite grease that different electric composite grease has certain drag reduction and cooling effect and the effect is different. Increasing the carbon black content of power composite grease can improve conductivity of power composite grease. The thickener itself will also have a certain impact on the properties of electric composite grease.