Fully covered three-position isolation circuit breaker

Abstract

The invention discloses a fully covered three-station isolating circuit breaker, which comprises three three-station isolating switches arranged side by side, three vacuum circuit breakers and cable terminals arranged side by side; the three-station isolating switch includes an insulating box , a three-position adjustment mechanism and a three-position operating mechanism; the vacuum circuit breaker is arranged below the three-position isolating switch, the vacuum circuit breaker includes a solid-sealed pole, and the top of the solid-sealed pole is connected to the The bottom of the insulating box is sealed and connected; the cable terminal is arranged under the vacuum circuit breaker, and the top of the cable terminal is sealed and connected with the bottom of the solid-sealed pole. The three-position isolating circuit breaker in the present invention adopts a fully-covered method, and the structure of electrical equipment is more compact and miniaturized, which reduces the occupation of working space, is convenient to operate, and has better insulation performance, further improving the safety performance of electrical equipment and pressure resistance, to ensure the safety of employees and prevent accidents in production.

Description

technical field [0001] The invention relates to the technical field of switch cabinets, in particular to a full-covered three-position isolation circuit breaker arranged in a switch cabinet and mainly applicable to below 40.5KV (international standard). Background technique [0002] Three-position isolating circuit breaker includes three-position isolating switch, vacuum circuit breaker and cable terminal. [0003] Three-position switch, English abbreviation 3PS, that is, 3 position switchgear. The three-position switch is often used in fully enclosed combined electrical appliances (GIS) or composite electrical appliances (PASS), and is not a separate product. Commonly used in XGN ring main unit. The so-called three-position refers to three working positions: 1 is the closing position where the main breakout of the isolating switch is connected, 2 is the isolation position where the main breakout is separated, and 3 is the grounding position on the grounding side. The thr...

AI Technical Summary

Problems solved by technology

[0006] The existing three-position isolating circuit breaker cannot achieve full coverage, poor voltage resistance, large electrical equipment, troublesome operation, cannot meet the requirements of miniaturization and full insulation, poor safety performance, and cannot be used in various occasions

[0007] Sulfur hexafluoride (SF 6 ) gas, especially in the vacuum circuit breaker to be filled with sulfur hexafluoride (SF 6 ) gas, sulfur hexafluoride (SF 6 ) has good insulation performance and arc extinguishing performance, filling it into a vacuum circuit breaker can have better insulation performance and voltage resistance performance, and can ensure safe production operations, but sulfur hexafluoride (SF 6 ) The chemical properties of the gas are stable, it is not easy to decompose in the atmosphere, and sulfur hexafluoride (SF 6 ) gas will cause harm to the environment and cause the greenhouse effect, the existing sulfur hexafluoride (SF 6 ) gas is usually mixed with toxic sub-sulfur fluoride, hydrogen fluoride, disulfur decafluoride gas, which is easy to cause harm to the human body

[0008] The structure of the three-position isolating switch on the market is relatively complicated. At present, the three-position switch used in the power grid is mainly assembled by imported components. It has a complex structure, large volume, high cost, and poor accuracy and reliability of the switching action.

[0009] The existing three-position isolating switch is usually connected to the bus bar. At present, the bus bar is basically exposed, which cannot meet the requirements of full insulation, and has a large potential safety hazard. It cannot be used in various occasions.

[0010] Existing cable terminals usually set the output port vertically, which causes the cable to be bent when it is connected, which increases the difficulty of the operation and affects the service life of the cable

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