Dry type transformer aluminum alloy clamp

Abstract

A dry type transformer aluminum alloy clamp includes an upper clamp part and a lower clamp part which are made by 6061-T6 aluminum alloy to replace steel-structure clamps commonly used nowadays. The surface of 6061-T6 aluminum alloy is subjected to anodic oxidation treatment, the thickness of an anodic oxide film is 8-10 micrometers, and the corrosion resistance of the surfaces of the upper clamppart and the lower clamp part can be largely improved. Finite element modeling is used for calculating the strength of the upper clamp part and the lower clamp part, the lifting, hoisting and swinging, transportation and turnover conditions of a dry type transformer clamped by the upper clamp part and the lower clamp part are calculated, the cross-sectional shapes of the upper and lower clamp parts are optimized, and the cost of the upper and lower clamp parts is reduced. By omitting the use of welding of the upper and lower clamp parts, the strength of the upper and lower clamp parts is increased; elastic washers are added at the positions of iron core clamping, coil pressing and steel structure bolt connection parts so as to compensate for clamping-force reduction caused by thermal expansion and cold contraction, zinc plating or zinc-nickel plating anticorrosive treatment is adopted for the surfaces of steel-structure parts and steel fasteners making contact with aluminum alloy clamps, the thickness of a plating layer is 8-12 micrometers, and the bimetallic contact corrosion degree of aluminum alloy is reduced.

Description

technical field [0001] The invention relates to a dry-type transformer aluminum alloy clamp, in particular to an F-class insulated dry-type transformer aluminum alloy clamp with a weight not greater than 3 tons and used indoors. Background technique [0002] In recent years, as the country has become more and more stringent on environmental pollution control, the surface painting treatment of steel structure clamps has polluted the environment, and there are fewer qualified outsourcing manufacturers. Because there is an oxide film on the surface of the aluminum alloy to protect the surface of the aluminum alloy. Aluminum alloy clamps are used instead of steel structure clamps, no need to spray paint, which reduces the pollution to the air environment. At the same time, the transformer aluminum alloy clamp has the following advantages: [0003] 1) The aluminum alloy has good thermal conductivity, which is beneficial to the heat dissipation of the transformer core. [0004]...

AI Technical Summary

Problems solved by technology

[0008] 1) Cost-effectiveness problem: Since the unit price of aluminum alloy channel aluminum is 4 to 5 times that of channel steel, the cost is relatively high

[0009] 2) The strength reduction problem of the welding part: the strength of the welding part of the aluminum alloy clamp drops more, which is about 60% of the strength of the base metal

The clamping force of the transformer is easily reduced under the action of thermal stress of increasing temperature and decreasing

[0011] 4) The use temperature of aluminum alloy clamps should not be high. After exceeding 200°C, the aluminum alloy will soften

[0012] 5) The potential of the aluminum electrode is very negative, and when in contact with dissimilar metals, it is easy to cause serious galvanic corrosion as an anode

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