Miniature fixed metal-armored switchgear

Abstract

The invention relates to a miniature fixed metal-armored switchgear, which comprises an instrument box, a mechanism case, composite apparatuses, current transformers and a grounding switch. A cabinet body comprises an upper cabinet body unit and a lower cabinet body unit. The composite apparatuses are arranged on the upper cabinet body unit. Upper side plates on the upper cabinet body unit are provided with a busbar wall bushing respectively. Isolating switch fixed contacts are poured in corresponding pedestals and positioned on the inner side of a wall body. Three-phase isolating switch moving contacts of the composite apparatuses correspond to the three-phase isolating switch fixed contacts. Three current transformers are overlapped and arranged on the lower cabinet body unit. The grounding switch and an arrester are arranged in the lower cabinet body unit. The composite apparatuses and the three current transformers divide the cabinet body into an upper main cable chamber, a middle vacuum switch chamber and a lower switching cable chamber. The miniature fixed metal-armored switchgear has switching-on, isolating and grounding functions, remarkable isolating fractures and a compact structure, and is convenient to mount; and mounting efficiency can be improved, a cabinet body mounting space can be reduced and cabinet body manufacturing cost can be decreased.

Description

technical field [0001] The invention relates to a metal-clad miniaturized fixed switchgear, which belongs to the technical field of fixed high-voltage switch cabinets. Background technique [0002] In the field of high-voltage electrical equipment technology, indoor box-type metal-enclosed switchgear is a new generation of miniaturized and combined electrical switchgear, which can be widely used in 3-12kV three-phase AC 50Hz power systems and suitable for various box-type substations , Ring network power distribution system. [0003] For medium voltage (3.6kV ~ 24kV) ring network cabinets, most of them use SF 6 Inflatable switch with gas as insulating medium and arc extinguishing medium, but SF 6 There is a possible SF in the ring main unit 6 Gas leakage, so during use, regular switch maintenance is required, so additional operation and maintenance costs are required, and SF 6 Gas recovery and post-processing are very difficult. The vacuum switchgear can solve the above...

AI Technical Summary

Problems solved by technology

However, the fixed switchgear cabinet is connected by multiple ribs, so the cabinet structure is complicated, the assembly is cumbersome, and the production efficiency is low. The combined electrical appliances are fixedly installed in the cabinet, which is not convenient for on-site maintenance and repair of electricity.

Furthermore, the current transformer in the switchgear is installed in the cable room, and the connection between the current transformer and the vacuum switch room is through connecting wires. In order to achieve the purpose of safe work, there is also a partition on the cabinet to form a vacuum switch. room and cable room, so the connecting wires need to pass through the wall bushing set on the switch cabinet partition to connect with the vacuum switch, so it is bound to increase the size of the switch cabinet and increase the manufacturing cost, and the wall bushing must be connected together by wires This makes the space of the switchgear must be large enough, which not only increases the manufacturing cost of the switchgear, but also increases the floor space as the space of the switchgear increases.

Secondly, the three phases of the current wall bushings are used independently, so when the wall bushings are installed on the cabinet, they need to be adjusted to ensure that each phase can be connected feasible, and in order to avoid generating a magnetic field when passing through the cabinet The eddy current needs to be installed on the stainless steel plate, which further increases the manufacturing cost of the cabinet

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