The making inrush current generated during the making operation of SF

6

circuit breaker will cause severe erosion to the arcing contact. For studying the erosion of the arcing contact at different making speeds

a simulated SF

6

circuit breaker interrupter is designed

the making erosion experiment of CuW arcing contact at different making speeds is performed

and the stress analysis of arcing contacts at different making speeds is simulated. It is found by the study that the mass erosion rate per joule does not monotonically increase with the arc energy. The arc energy of No.4 contact is minimum

but the mass loss rate is as high as 40 mg·kJ

-1

. With the increase of the making speed under the same current

although the arcing time and arc energy will decrease

yet the stress of the arcing contact will increase with the increase of the making speed. The friction and wear erosion will increase

the mass loss rate per joule

as a result

will also increase. The research results in this paper have certain guiding significance for the analysis of the electrical endurance of contact erosion in making operation.