The fuse endured ability which to the high-pressured shunted capacitor in the short circuit discharge test and switched on flows rapidly to carry on the comprehensive theoretical analysis The selective analysis had transited the electric current and causes gives off heat the energy The comprehensive theoretical analysis on withstanding short circuit discharge test and inrush current capacity in closing operation in the high voltage shunt capacitor is conducted

mainly in the analysis of transient over current and its caused give off the heating energy

fusing energy of internal fuse

temperature rise and fall

and calculation formula is given in detail.It is pointed out that the heating energy of fuse due to transient over current is proportional to the capacity of elements in series with it and independence of the size and shape of transit overcurrent.In the short circuit discharge test each time the transient heating energy is 3.125 times that of inrush current in closing operation.From the view of transient heating energy and temperature rise

once the internal fuse capacitor can withstand the short circuit discharge test

it can be able to withstand inrush current in closing operation without any damage.