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

A technology of isolating reversing and double breakpoints, which is applied in the direction of electric switches, high-voltage air circuit breakers, high-voltage/high-current switches, etc., can solve the problems of increasing the on-off capacity of the circuit and the large volume of the isolating reversing switch, and achieve contact resistance Small, not easy to burn, safe and reliable to use

Inactive Publication Date: 2012-09-19
XUZHOU ZHIXIN ELECTRICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reversing switch with double breakpoint structure can be applied to the medium voltage electrical system. In the foreign 3.3kV electrical system, Baldwin&Francis company adopts the isolation reversing switch with double breakpoint bridge contact and magnetic blowing grid interrupter structure, Allenwest The B77 switch of Wallacetown company adopts the structure of single-pole double breakpoint plus grid plate interrupter, and adopts the method of parallel connection of two groups of units to increase the circuit on-off capacity. The isolation reversing switch has a large volume

Method used

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

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Embodiment Construction

[0014] like figure 1 As shown in the electrical schematic diagram: Compared with the three-phase power supply L1, L2, L3, the double-pole double-breakpoint air-type isolating reversing switch has three working units: the first static contact 2 of the first unit, the second The static contacts 3 are connected in parallel and connected to the power supply L1. When the double-pole double-break point moving contact 6 turns to the positive closing position, the first static contact 2 and the fourth static contact 5 are connected, and the power supply L1 is connected to the U phase of the motor. When the double-pole double-break point moving contact 6 turns to the reverse closing position, the second static contact 3 and the third static contact 4 are connected, and the power supply L1 is connected to the V phase of the motor; the purpose of motor commutation is realized.

[0015] like figure 2 , image 3 Shown: a mine-used kilovolt-level double-pole double-breakpoint air-ty...

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Abstract

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 root, the magnetic blow coil connected with the arc striking plate generates excitation through arc current, and the excitation generates an arc blowing magnetic field between two magnetism conduction plates through the magnetism conduction iron core. Under the effect of the arc blowing magnetic field, the brake-separating arc is introduced into arc-extinction areas of the arc-extinction grids to be extinguished.

Description

technical field [0001] The invention relates to a mine electric switch, in particular to a mine kilovolt-level double-pole double-breakpoint air-type isolating reversing switch, which can be used for power isolation and reversing of a 3.3kV mine magnetic starter switch. technical background [0002] In the domestic 3.3kV electrical system, drum-type isolating reversing switches are mainly used, which have no breaking capacity. The reversing switch with double breakpoint structure can be applied to the medium voltage electrical system. In the foreign 3.3kV electrical system, Baldwin&Francis company adopts the double breakpoint bridge contact and the isolation reversing switch with the structure of magnetic blow grid slice interrupter, Allenwest The B77 switch of Wallacetown Company adopts the structure of single-pole double breakpoint plus grid plate interrupter, and adopts the method of parallel connection of two groups of units to increase the circuit on-off capacit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H33/18
Inventor 岳福良黄爱淼
Owner XUZHOU ZHIXIN ELECTRICAL TECH
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