Switch cabinet

Abstract

Provided in the invention is a switch cabinet comprising a bus chamber, an instrument chamber, a mechanism chamber, a cable chamber, a switch chamber and a pressure relief channel. The instrument chamber, the mechanism chamber, and the cable chamber form a front cabinet of the switch cabinet; and the bus chamber, the switch chamber, and the pressure relief channel form a rear cabinet of the switch cabinet. An upper inlet wire insulator group, a circuit breaker assembly, a grounding switch and a lower outlet wire insulator group are arranged in the switch chamber successively from top to bottom. Besides, a temperature monitoring unit is also arranged at the switch. All functional chamber zones in the front cabinet and the rear cabinet are distributed in a stepped mode. The provided switch cabinet has advantages of a fixed cabinet, a mid-set handcart cabinet, and gas-insulated switchgear equipment; the overall unit and bus modularization design is employed; and the installation and maintenance become secure, simple, and convenient.

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 switchgears (circuit breaker switchgears) of 6-40.5KV at home and abroad mainly include fixed switchgears (fixed cabinets), central or removable switchgears (handcart cabinets), inflatable cabinets (gas-filled cabinets) and Solid insulation switchgear, the above-mentioned high-voltage s...

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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