Operating characteristics of superconducting arc-induction type DC circuit breaker for reliable arc induced

This paper compared and analyzed the arc-induction efficiency of a superconducting arc-induction type DC circuit breaker. The superconducting arc-induction type DC circuit breaker is composed of a superconducting magnet, a mechanical breaking contact, and an induction needle. In addition, by inducing the arc generated from the mechanical contact using the induction needle connected in series with the ground wire, the high efficiency of the arc extinguishing operation is performed. However, in order to perform a reliable arc-induction operation, verification of the use of an appropriate induction needle is required. Therefore, we tried to compare and analyze the arc-induction characteristics depending on the length of the arc between the mechanical contacts and the presence or absence of a superconducting magnet. As a result, it was confirmed that the blocking operation time was shortened by about 21 times depending on the presence or absence of the superconducting magnet, and the result that the arc length had an effect on the arc-induction rate was confirmed.