At present

the design of internal fuse of capacitor mainly depends on both test and previous experience. In case of great change of technical parameters

the design and type selection the internal fuse often lack sufficient support since the waveform of the internal fuse fusing current in the capacitor is difficult to be measured. Therefore

in this paper the MATLAB Simulink model of internal fuse is set up based on the resistivity-specific action model of electric explosion wire. The influence of the internal fuse size itself and external voltage on the fuse current is studied by using this simulation model and based on the parameters of the actual capacitor. The fuse current waveforms in case of breakdown of elements in different positions are also simulated. The results show that the specific action circuit model can well describe the operation process of the fuse in the capacitor

and the fuse current has a great relationship with the position of the breakdown element in the series section

which provides theoretical support for the design and selection of the internal fuse and the monitoring and identification technology of the internal fuse fusing.