DIRECT-CURRENT INTERRUPTION DEVICE

• Main Authors: MATSUO, Takayuki, Oi, Kazunobu
• Format: Patent
• Language: English; French; German
• Published: 27.03.2019
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRIC SWITCHES; ELECTRICITY; EMERGENCY PROTECTIVE DEVICES; RELAYS; SELECTORS

To provide a dc interruption apparatus requiring no circuit for producing current zero point forcibly and having a simplified construction adequate for cost reduction, one end of a main contact 30a, 30b, 30c for each phase of a dc high speed vacuum circuit breaker 30 is connected with a positive output end of a corresponding phase of a rectifier 20 for converting ac power to dc power with semiconductor devices arranged in a bridge. The other ends of the main contacts 30a, 30b, 30c are connected together to form a positive side output line 40. A pulse-shaped current flows in an arm of each phase of the rectifier 20 and the current is commutated among the arms sequentially, so that the current is reduced to zero after the commutation. Each of main contacts 30a, 30b, 30c of dc high speed vacuum circuit breaker 30 interrupts the current reduced to zero by the commutation, so that the interruption is easier.