Mining kilovolt-level double-pole single-breakpoint air isolation reversing switch

Abstract

The invention discloses a mining kilovolt-level double-pole single-breakpoint air isolation reversing switch, and relates to an electrical element. A double-pole single-breakpoint moving contact and grid type magnetic quenching devices are adopted. Working current switching-on / off capability reaches more than 630A. The grid type magnetic quenching devices are fixed in a transverse isolation groove of an upper cover. The transverse isolation groove of the upper cover and a corresponding transverse isolation groove of an upper cavity of an insulating seat form a closed space in which the grid type magnetic quenching devices are positioned. Each grid type magnetic quenching device comprises a cover, arc quenching grids, a run-on plate, a magnetic blowout coil, a concentrating flux core and a concentrating flux plate. The arc root of an opening arc is shifted downwards to the run-on plates under the action of an electric field, the blowout coils generate an excitation field through arc current, the excitation field generates an arc blowing magnetic field on the two concentrating flux plates through the concentrating flux cores, and the opening arc is struck into the arc quenching grids under the action of the arc blowing magnetic field to be quenched.

Description

technical field [0001] The invention relates to an electrical component, in particular to a kilovolt-level double-pole air-type isolating reversing switch used for a large-scale motor in a coal mine, and can also be used for the isolation of a kilovolt-level magnetic starter configuration used by a motor on other mining equipment Reversing switch. Background technique [0002] At present, the air-type isolating reversing switches used in domestic coal mines and other mines mostly adopt GHK series reversing switches, "see patent CN2048236UCN201956259U". Its switch contacts are double-arm clapping structure, each arm is equipped with three reversing moving contacts, and the reversing operating mechanism drives the three reversing moving contacts on the left and right rotating arms to respectively engage with the static contacts to realize isolation and reversing Features. The snap-fit ​​contact has low contact pressure, is easy to burn, and is unsafe to use. [0003] In...

AI Technical Summary

Problems solved by technology

[0005] 1. Many equipments in large coal mines require the on-off capacity of the isolation reversing switch to be above 630A. The on-off capacity of the above two reversing switches is only 450A, which cannot meet the requirements of use.

[0006] 2. The arc extinguishing device used by the reversing switch is a grid plate arc extinguishing chamber structure. There is no magnetic blowing coil and magnetic core, so the arc current cannot be excited. The excitation generates arc blowing between the two magnetic conductive plates through the magnetic core. Magnetic field, arc extinguishing effect is poor, especially when used in coal mines, it brings safety hazards

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