Abstract
For an SF 6 circuit breaker in capacitor bank making operation, the inrush current may cause serious erosion to its arcing contacts. In order to observe the contact erosion property and electrical life under making process, an arc extinguish chamber of SF 6 circuit breaker with Cu-W arcing contacts was designed, and experiments of capacitor bank making were carried out under different experimental conditions. In the experiment under various conditions, the arc duration and inrush current have been recorded, the mass loss has been measured after 100 times of operation, and the mass loss rate and friction coefficient have been calculated. Based on the failure mode of reversed order contacting between arcing and main contacts, an estimation method has been proposed to calculate the electrical life of arcing contact in making operation. This method can be used to support the design of the arcing contacts. Changing the arcing contact geometry and reducing arc energy in making operation will improve electrical life of arcing contact.
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