Abstract: In order to reduce the occurrence of short circuit accidents caused by small animals or foreign objects in the bus bridge in the 10 kV switchgear, the bus bridge is usually wrapped with a heat shrinkable sleeve and the bus bar connection is wrapped with an insulating sheath, but the resulting fault events occur from time to time. Combined with the on-site inspection of the fault, the main cause of the accident is analyzed by building a test model and carrying out simulation verification tests, and combined with the current standards and technical specifications, the relevant operation and maintenance strategies such as improving the installation and acceptance specifications and shortening the maintenance cycle are proposed.