Combined electrical apparatus with isolation switch, vacuum breaker and earthing switch

Abstract

The invention discloses a combined electrical apparatus with an isolation switch, a vacuum breaker and an earthing switch. The combined electrical apparatus comprises a machine frame, wherein three bus wire inlet columns are fixed on the upper portion of the machine frame, an insulation rotating shaft is pivoted on the upper middle portion of the machine frame, and three isolation knife switches are arranged on the insulation rotating shaft. Three fixedly sealed poles are arranged in the middle of the machine frame, and each fixedly sealed pole comprises an insulation casing, a vacuum arc-extinguishing chamber, a wire inlet column and a wire outlet column. Each vacuum arc-extinguishing chamber is provided with an operation pull rod, an earthing contact is arranged on the lateral surface of each wire outlet column, the middle of an insulation connection rod is hinged to the lower portion of each insulation casing, one end of the insulation connection rod is hinged to the lower end of each pull rod, and the other end of the insulation connection rod is hinged to an over-travel rod. The lower end of each isolation knife switch is hinged to the upper end of the wire inlet column of each fixedly sealed pole. A breaker operation shaft is pivoted onto the machine frame located on the side of the three fixedly sealed poles. An earthing rotating shaft is pivoted on the middle lower portion of the machine frame, and an operation mechanism is arranged on one side of the machine frame. The combined electrical apparatus is compact in structure, small in volume, simple in the transmission mechanism and high in operation reliability.

Description

technical field [0001] The invention relates to a switchgear for an indoor switchgear, in particular to a combination electric appliance with a disconnector, a vacuum circuit breaker and a grounding switch. Background technique [0002] At present, 12kV switch cabinets are developed in China. Vacuum circuit breakers, isolating switches, and grounding switches are installed independently. There are disadvantages such as large volume of switch cabinets, complicated interlocking, large amount of copper bars, many connection points, complicated operations, and troublesome maintenance. There are also a few in China. Manufacturers have introduced vacuum circuit breakers with isolation, but most of them are modified on the basis of traditional horizontal circuit breaker mechanisms. The phenomenon of patchwork is obvious, and there are problems of large volume and complicated transmission. At the same time, the problems are low reliability. Maintenance trouble. [0003] On December...

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Problems solved by technology

[0002] At present, 12kV switch cabinets are developed in China. Vacuum circuit breakers, isolating switches, and grounding switches are installed independently. There are disadvantages such as large volume of switch cabinets, complicated interlocking, large amount of copper bars, many connection points, complicated operations, and troublesome maintenance. There are also a few in China. Manufacturers have introduced vacuum circuit breakers with isolation, but most of them are modified on the basis of traditional horizontal circuit breaker mechanisms. The phenomenon of patchwork is obvious, and there are problems of large volume and complicated transmission. At the same time, the problems are low reliability. maintenance trouble

[0003] On December 30, 2009, although an invention patent with the patent number ZL200920035512.6 and the name "isolating switch and vacuum circuit breaker combined electrical appliance" was published, it includes the isolating switch part, the vacuum circuit breaker part, the grounding part, and the operation lock part and the frame, but the isolating switch part is set on one side of the vacuum circuit breaker part, and the grounding part is set on the other side of the vacuum circuit breaker part; this structure also has the problem of relatively large volume, which is not conducive to the miniaturization of the switchgear

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