Operation Characteristics of DC Circuit Breaker Using Arc Induction Technique According to the Magnetism of the Superconducting Magnet

With the development and advancement of renewable energy sources, the interest in DC power distribution systems is increasing, highlighting the importance of research on the fault current cutoff technology for DC power and grid protection. A stable cutoff technology must be developed to secure the stability and high reliability of the DC system in the future. The most important factor in the cutoff technology is how to effectively extinguish the arc that occurs when the fault system is interrupted. Therefore, further research on arc extinguishes technology for DC distribution systems is inevitable. In this paper, a new magnetic arc induction technique is proposed. The magnetic arc induction technique blows the arc between the break contacts through the magnet toward the induction needle. The induction needle absorbs the arc before sending it to the ground wire for extinction purposes. However, the mechanical DC circuit breakers have a limited opening speed. We want to overcome this limitation with superconducting magnets. The previous simulation results confirm the feasibility of the magnetic arc induction technique, and this was attempted to be proven in this study through experimentation. As a result, it was confirmed that the arc extinction time was reduced depending on the presence or absence of a magnet. It may be the basis for developing the distribution system mechanical breakers.