The heat fault for type TBB14-35-54000/500M-2AQW reactive capacitor at 500 kV substation in Jiangxi EHV grid is occurred frequently due to structural defect of connections and stable operation of the power system is affected seriously. In this paper

the overheating of capacitor bank is summarized and the design improvement of the capacitor connection（new type H clip）is made and the brass plated with in process for the clip is used to increase corrosion resistance of the equipment. It is found throughout the installation and application at many substations that the infrared temperature measurement result and maintenance convenience are superior to Harvard clip

which provides reference for the operation and maintenance of reactive compensation capacitor.