High-voltage circuit breaker is an important control and protection device in a power system

and its reliability affects the safe operation of power system. Investigations have shown that the main fault of high-voltage circuit breaker is mechanical fault

so the mechanical characteristics of the high-voltage circuit breaker need to be tested. In this paper

we used a high speed camera to build a mechanical characteristic measurement platform for circuit breakers. Using this measurement platform

we tested the ZN63 A-12 vacuum circuit breaker

measured the dynamic vibration characteristics of the closing spring of the high voltage circuit breaker

and compared the stress relaxation spring with the normal spring to explore the effect of spring stress relaxation fault on the vibration characteristics of the circuit breaker closing spring. In addition

taking the closing process of the high voltage circuit breaker as an example

we took the photograph of the dynamic motion process of the four-bar linkage mechanism by the platform

and calculated the curve of the angle of the connecting rod during the closing process. The research results show that there are obvious differences in the vibration characteristics of the normal spring and the stress relaxation spring

and the angle between the connecting rods is changed from 139.7° to 175.6°

namely

the angle has changed by 35.9°

which is consistent with the actual value.