Winding Design for a Rotating Arc SF6 Circuit Breaker and Investigating its Effects on Arc Temperature and Resistance

A winding is designed for a rotating arc circuitbreaker which is used to generate an external magnetic field in Zdirection for imposing a rotational electromagnetic force to arc.The winding location is chosen according to the structure of casestudy. Simulation results are obtained using a three-dimensional(3-D) transient model. The effect of winding on arc is driven byanalysis of magnetic field and its interaction with externalmagnetic fields and their influences on arc stability in circuitbreaker. The 3-D distribution of electric current density isobtained from a current continuity equation along with thegeneralized Ohm’s law, while the magnetic field induced bycurrent flowing through the arc column, is calculated bymagnetic vector potential equation. In SF6 circuit breakers whengas interacts with arc column, fundamental equations such as;Ampere’s law, Ohm’s law, turbulence model, transport equationsof mass, momentum, and energy of plasma flow have to becoupled for analysis the phenomenon. The coupled interactionsbetween arc and plasma flow are described in the frame work ofmagnetohydrodynamic (MHD) equations in conjunction with aK  turbulence model. Simulations have been focused ondesigning the winding and the effects of external field on arccharacteristics such as; magnetic field distribution,electromagnetic force density, pinch effect, electricalconductivity, arc resistance and temperature

کلیدواژه ها:

Rotating Arc ، Circuit Breaker ، plasma ، WindingDesign