To obtain the difference in vibration signal during the mechanical performance deterioration of circuit breaker in multiple breaking and closing actions

this paper extracted the vibration signal of SF6 circuit breaker in the process of breaking and closing actions for 4 000 times based on wavelet packet decomposition theory.Besides

it carried out wavelet packet decomposition to calculate the energy spectrum and energy entropy of each node.The calculation results show that the energy spectrum of the vibration signal in the process of closing and breaking is mainly distributed in node(4

0)and node(4

1)

which account for 95% of the energy.As the number of circuit breaker actions increases

the energy share of the breaking vibration signal node(4

0)increases

the energy share of node(4

1)decreases

and the energy distribution shifts to lower frequencies.The energy ratios of node(4

0)and node(4

1)of the closed vibration signal fluctuate within a certain range and show no obvious trend

the wavelet packet-energy entropy of each node of the closed vibration signal and the split vibration signal remain unchanged.