Theoretical and experimental study on the opening characteristic of puffer circuit breakers

According to the relationship between the operating mechanism and the are extinguish chamber of a puffer circuit breaker, mathematical models have been developed, and the influences of the hydraulic mechanism and the chamber on the moving characteristics of the puffer circuit breaker have been studied. Therefore, adjusting the diameter of the drain oil aperture of the operating mechanism is an effective way to obtain various breaking characteristics. Hence, it is possible to realise 'intelligent operation'. The simulation results are shown to be in accordance with the experiment results; and it is also shown that the models are more universal and practical.