Bursting test process and mechanism of the high voltage all-film shunt capacitors are analyzed.It is pointed out in this paper

through particular behavior of the internal fuse capacitors with combination of achievement of the oil switch bursting research

that the direct reason of capacitor bursting failure is due to the pressure wave produced by the arc in capacitor oil

and the amplitude of the bow wave of the pressure is determined by the energy injection rate dW/dt.Therefore

direct reason for the bursting of capacitor is not due to injected energy but energy rising rate dW/dt.The behavior of the internal fuse in capacitor bursting test is also especially analyzed.It is shown in the test that a great deal of energy is injected during the bursting test of some internal fuse all-film capacitors

but the capacitor case is still in good condition without any damage.This is not only related to the dielectric system construction

but also to the fuse’s action behavior.Finally

the measures of improving the ability of capacitor to resist the bursting are discussed.