DIRECT-CURRENT CIRCUIT BREAKER

摘要

A direct-current circuit breaker includes a switching unit inserted in the direct-current line; and a commutation circuit that includes a series circuit including a first current-limiting element and an interrupting unit that forms a current zero point by superimposing a resonance current on a direct current flowing in the direct-current line and interrupts the direct current at the current zero point, that is connected in parallel with the switching unit, and that becomes a flow path for the direct current after the switching unit is opened, wherein current interruption is performed by the interrupting unit after the switching unit is opened.

主权项

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, wherein current interruption is performed by the interrupting unit after the switching unit is opened.