The double-break vacuum circuit breaker can remarkably reduce the re-strike probability and improve the performance of switching the capacitor bank during capacitive current switching period by way of sufficiently using the perfect insulation performance of short vacuum gap. In this paper

the pre-strike characteristics

in including pre-strike voltage

pre-strike clearance and its dispersion of the double-break vacuum circuit breaker in the case of using grading capacitance and resistance

is studied by experiment and its Weibull distribution is calculated. The study result shows that no matter how the voltage amplitude is

the high-voltage resistance can mitigate the breakdown process by obstructing the discharge current flowing from the grading capacitor to the vacuum interrupter

and considerably enhance the pre-strike characteristics of the double-break vacuum circuit breaker. As for such two resistance and compactness grading modes as serial resistor and bridge resistor

the latter can reduce the number of resistors used in a circuit

thereby decreasing both cost and volume of the circuit breaker and

at the same time

helping to improve heat dissipation of the vacuum circuit breakers during operation. The study result presented in this paper can provide technical support for reducing the electrical dispersion angle and improving the phase-controlled making accuracy of the double-break vacuum circuit breaker.