Simulation Of Arc Dynamic Process For Aviation Circuit Breaker

Low-voltage circuit breaker is widely used in the electrical industry, and it plays a very important role in the power supply system. Breaking reliably is an important aspect of the circuit breaker. The arc is produced during the breaking process of the circuit breaker. The motion of arc is very complex in Physics, which involves multiple physical fields coupling effect. In the electrical appliance industry, the arc not only burns out the contacts, but also leads to fusion welding of the contacts, which causes a short circuit to damage power lines and even to hurt the staffs. And, it is always the bottleneck that arc makes the contact ablate during the breaking process of the aviation circuit breaker, which restraints the development of long life and high power circuit breaker. Therefore, the production of arc and its motion should be studied through searching effective methods of arc extinction to make system fault be isolated reliably and effectively so as to the stability of system. The SDB-A series circuit breaker is chosen as the main research object, and the arc properties in contacts breaking process and methods of arc extinction are researched in this paper. The main work is as followings:First, the arc simulation model is established in this paper. Then the proper magnetic blow program is chosen according to the established model. The shape and size of the permanent magnet is designed.Second, the distribution nephogram of magnetic induction intensity about contacts and arc are calculated and analyzed. And then, it studies the distribution rule. The force situation of arc in steady magnetic field is calculated. Besides, the force situation of arc is compared under different contact shapes, materials of contact, the numbers of grid plate and different currents.Third, the volt ampere characteristic of the arc is calculated in this paper. And it summarizes the methods of arc extinction.