Three-phase buses in switch cabinet

Abstract

The invention relates to three-phase buses in a switch cabinet. The three-phase buses are formed by adding at least one reinforcement rib to one or two sides of regular rectangular buses, the reinforcement rib is a rectangular, arc-shaped or trapezoid-shaped structure, the manufacturing material of the special-shaped buses is copper, aluminum, aluminum alloy or copper-clad aluminum, if the special-shaped buses are three-phase special-shaped buses in a back delta-shaped structure, a front delta-shaped structure or a step-shaped structure, the special-shaped buses are arranged in the switch cabinet in a staggered mode. According to the three-phase buses, influence of electro-dynamic repulsion force on moving and hot stability of the buses is reduced, moving and hot stability among the buses is effectively improved, great importance is exerted onto safe and reliable operation of electric equipment; a back cross section area of a special-shaped aluminum bar is improved by one times, cost is reduced by 70%,various parameters such as the cross section area, circumference, hot radiation coefficients, weight and cost are all better than those of copper bars in the prior art, and the three-phase buses have wide application prospects.

Description

technical field [0001] The invention relates to a busbar in a switch cabinet, in particular to the structure of the busbar and its layout in low-voltage switchgear. Background technique [0002] At present, electric energy has become the main energy and driving force of modern society and human activities. The task of power supply is to supply and distribute electric energy reasonably on demand. Therefore, it must meet the basic requirements of safety, reliability, quality and economy. When a short-circuit fault occurs in the power system, its impedance is much smaller than that of the circuit during normal operation, and a short-circuit current that is dozens or even hundreds of times higher than the normal operating current is generated, and its value can reach tens of thousands or even hundreds of thousands of amperes, that is, there is a strong The short-circuit current passes through the electrical equipment and conductors to generate a strong electromotive force and ac...

AI Technical Summary

Problems solved by technology

[0009] (1) When the busbars are arranged, all parts are arranged in parallel, and no effective measures are taken to solve the electrodynamic problem. Therefore, the anti-phase electrodynamic force of the three-phase horizontal busbar is poor, resulting in poor dynamic and thermal stability between the busbars

At the same time, it also has a great impact on temperature rise and heat dissipation, which is not conducive to the long-term operation of the switchgear

[0010] (2) The layout of the busbar results in a large width of the switchgear cabinet, a large footprint and high cost

[0011] (3) Unreasonable layout causes waste of non-ferrous metals

[0014] 2) The mechanical properties of aluminum busbars are also much different than those of copper busbars, and the ability to resist motion and thermal stability is poor

Some foreign companies also have reports on the application of aluminum bus bars in low-voltage switchgear, but there are no examples of special-shaped bus bars

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