Kilovolt-level double-pole double-breakpoint air type isolation change-over switch for mines

• Main Authors: YUE FULIANG, HUANG AIMIAO
• Format: Patent
• Language: Chinese; English
• Published: 19.09.2012
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRIC SWITCHES; ELECTRICITY; EMERGENCY PROTECTIVE DEVICES; RELAYS; SELECTORS

The invention discloses a kilovolt-level double-pole double-breakpoint air type isolation change-over switch for mines and relates to an electric element. A double-pole double-breakpoint movable contact and a magnetic blow grid arc-extinction device are utilized, and make-break capacity of working current can reach more than 630 A. Casings of the arc-extinction device are installed at the upper end and the lower end of an insulation seat respectively and serve as an upper cover and a lower cover of a switch casing, a sealing space is defined by the casings and the insulation seat, and the magnetic blow grid arc-extinction device is arranged in the sealed space. The magnetic blow grid arc-extinction device comprises the casings, arc-extinction grids, an arc striking plate, a magnetic blow coil, a magnetism conduction iron core and magnetism conduction plates. Under the effect of an electric field, the arc root of a brake-separating arc moves to the arc striking plate with the same electric potential as the arc