Experimental Study on Influence of Cup-shaped Longitudinal Magnetic Contact on Arc Characteristics
The structure parameters of contact of vacuum interrupter have an important influence on the arc charac-teristics of its arcing process.The influence of contact slotting number,clearance and ferromagnetic structure on the arc characteristics is obtained by designing two types of experimental platforms for experimental study.The experi-mental results show that the contact slotting has an important influence on accelerating the arc diffusion and improv-ing the breaking capability,and the increase of the number of contact slotting will make the arc configuration more stable but,at the same time,excessive slotting number will make the longitudinal magnetic field intensity amplitude too large,which is not conducive to rapid arc diffusion.The clearance has two opposite influence on the movement of the cathode spot.The proper clearance can improve the arc configuration and the addition of ferromagnetic materials can make the cathode spot distribution more uniform,can make the contact edge burn more stably and improve the contact surface utilization.
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