Patent ID: 9413157
Filing Date: 2016-08-09
CPC Classification: H01H,H02H,H03K

Claim Text:
1. A direct-current circuit breaker that includes an interrupting unit that forms a current zero point by superimposing a resonance current on a direct current flowing in a direct-current line and interrupts the direct current at the current zero point, the direct-current circuit breaker comprising: a switching unit inserted in the direct-current line; a commutation circuit that includes a series circuit including a first current-limiting element, which is a reactor, and the interrupting unit and becomes a flow path for the direct current after the switching unit is opened, and a second current-limiting element which is inserted in series with the switching unit in the direct-current line, in which an impedance becomes approximately zero in a steady state, and in which an impedance instantaneously increases when overcurrent flows,