Fast vacuum switch can achieve fast clearance of short circuit fault of power system

which is of great significance to improve the transient stability of power system. It is also

at present stage

a research hotspot in the field of large current interruption technology both at home and abroad. The objective of this paper is to determine the influence of moveable mass of the driving system of the fast vacuum switch gas buffer on its opening characteristics. In this paper

the 72.5 kV single-break fast vacuum switch is taken as the research object. The multi-physical field simulation and calculation model with intercoupling of the air flow field

electromagnetic field

motion equation and external circuit is set up by using the multi-physical filed simulation and calculation method. The influence of the movable mass of the fast vacuum switch on its such opening characteristics as opening speed

momentum and buffering force is analyzed. The opening speed is the average speed within 10 mm after contacts separation during the opening process of the fast vacuum switch. The simulation results show that with the increase of moveable mass from 4 to 12 kg

the opening speed decreases following a negative exponent function from 6.13 to 3.50 m/s. The momentum reaching30 mm full clearance increases following a positive exponent function from 12.26 to 21.01 kg·m/s. The work

which is done by the buffering force

decreases following quadratic function from 443.61 to 203.02 J. Furthermore

the relationship between buffering force and the stroke complies with the form of power function.