Voltage transformer is an important device in the power system, and its main function is to measure and protect the power system. The equipment has been installed and used in excitation systems, measuring instruments, speed regulators and other electrical equipment. Voltage transformers and high voltage fuses are common accidents in power systems. When the high-voltage fuse of the voltage transformer blows, it will have a serious impact on the safety of the voltage transformer and the measurement of electricity bills. The maintenance and replacement of the high-voltage fuse is also troublesome.