Switch cabinet

Abstract

The invention provides a switch cabinet comprising a bus room, an instrument room, a mechanism room, a cable room, a switch room and a pressure-releasing channel. The front cabinet of the switch cabinet is formed by the instrument room, the mechanism room and the cable room. The rear cabinet of the switch cabinet is formed by the bus room, the switch room and the pressure-releasing channel. The switch room is internally provided with, from the top to the bottom in turn, an upper inlet wire insulator group, a circuit breaker assembly, a grounding switch and a lower outlet wire insulator group. Function room areas in the front cabinet and the rear cabinet are distributed in a step way. The circuit breaker assembly comprises a supporting frame, a circuit breaker, an operation member and a sealing member. When the circuit breaker assembly is arranged in the switch cabinet, the switch room is sealed by the sealing member. The circuit breaker assembly can be moved out of the switch room and the mechanism room by the supporting frame to be detected and maintained. The switch cabinet has advantages of a fixed cabinet, a mid-arranged type handcart cabinet and an inflation cabinet, integral units and buses are designed in a modularized way, and installation and maintenance are safe and simple.

Description

technical field [0001] The invention relates to a power distribution cabinet, in particular to a switch cabinet, more specifically to a sealed high-voltage switch cabinet, and belongs to the technical field of electrical equipment. Background technique [0002] High-voltage switchgear is an electrical product used to realize on-off, control or protection in power system generation, transmission, distribution, power conversion and consumption. The high-voltage switch manufacturing industry is an important part of the power transmission and transformation equipment manufacturing industry, and occupies a very important position in the entire power industry. [0003] At present, the high-voltage switchgear (circuit breaker switchgear) of 6-40.5KV at home and abroad mainly includes fixed switchgear (fixed switchgear), middle-mounted or removable switchgear (handcart cabinet), inflatable switchgear (gas-filled cabinet) and Solid insulation switchgear, the above-mentioned high-vol...

AI Technical Summary

Problems solved by technology

The positioning device disclosed in this application and the switchgear circuit breaker handcart obtained by its application can realize the accurate guidance and left and right limit of the handcart, and can meet the stable positioning of the handcart in different positions, which can effectively reduce the loss of electric power. The acting torque can overcome the large electric force; however, it still cannot achieve the same or similar stability as that of the fixed cabinet; in addition, the circuit breaker in the cabinet generally adopts VS1 or VD4 vacuum circuit breaker, and the alignment of the dynamic and static contacts is accurate and consistent with that of the fixed cabinet. If it cannot be monitored, the structure of the contact box is not conducive to the heat dissipation of the contacts, the insulation components are easy to age, and insulation breakdown discharge accidents occur

[0006] Both of the above two switchgears have two disadvantages: they occupy a large space and the primary circuit live main components are not completely enclosed in the switchgear

The so-called solid insulation is different from the solid-sealed pole in that it not only seals the vacuum interrupter of each item, but also casts the interrupter and its related components with epoxy resin as a whole, so that the switch The safe insulation distance between the internal phases and the ground has been shortened from 125mm for air insulation to the millimeter level, although the size and volume of the switchgear has been greatly reduced; the switchgear is green and environmentally friendly, suitable for distribution network automation, and has strong resistance to environmental pollution; but due to its The solid insulation is formed by the solid insulation method. The solid insulation is susceptible to moisture aging, the insulation performance is reduced, and it cannot be monitored and supervised in real time. On the contrary, it is prone to insulation breakdown discharge accidents; the production process is complex, and the insulation material with high performance and good stability It is a major difficulty for solid insulated switchgear. In addition, this type of switchgear also has the disadvantages of fixed cabinets. It is extremely inconvenient to detect and repair if a fault occurs; domestic companies are still in further research and development, while foreign imports are expensive and costly

[0009] At present, none of the above switchgears can meet the higher and higher requirements of the power system for power supply quality and reliability, nor can it meet the higher and higher requirements of the power system for the economy and reliability of high-voltage switchgear.

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