Resin-cast rectangular dry-type transformer

Abstract

The invention discloses a resin-cast rectangular dry-type transformer. The transformer consists of a bracket, an iron core, a high-voltage coil and a low-voltage coil, wherein the iron core, the low-voltage coil, an insulation layer and the high-voltage coil are sequentially arranged from inside to outside; the high-voltage coil and the low-voltage coil are connected with a high-voltage terminal and a low-voltage terminal respectively; the iron core is fixed on the bracket through an upper clamping piece and a lower clamping piece; the cross section of the iron core has a rectangular structure; the high-voltage coil and the low-voltage coil are wound on a mandrel along a rectangular shape; and each winding per phase is molded by casting the resin. As the iron core, the high-voltage coil and the low-voltage coil have the rectangular structure, the transformer has the advantages of reducing the length of a magnetic path and the center distance of the transformer mandrel, decreasing the weight of a yoke by about 20 percent, saving material, reducing the no-load losses of the dry-type transformer by 10 to 15 percent, the no-load current by about 5 to 12 percent, noise and production cost and enhancing the market competitiveness.

Description

technical field [0001] The invention relates to a power distribution equipment in a power grid, in particular to a resin casting rectangular dry-type transformer, which belongs to the technical field of transformers. Background technique [0002] With the rapid development of my country's industrial and agricultural production and the acceleration of power grid transformation, in response to the government's policy of vigorously carrying out resource conservation, energy saving and consumption reduction, and promoting the construction of a conservation-oriented society, a large number of small-volume, material-saving, flame-retardant, and environmental-friendly functions are required. Dry-type transformer, dry-type transformer is widely used as a kind of power distribution equipment, and is widely used in power supply occasions such as electric power, metallurgy, chemical industry, railway, office building and residential quarters. However, in the existing dry-type transforme...

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Problems solved by technology

[0003] There are obvious deficiencies in the above core column structures. For example, the center distance of the transformer is relatively large, the amount of iron core is large, the number of iron chips is relatively large, and the cutting specifications of the iron chips are more, which greatly increases the labor hours of cutting the iron chips and the difficulty of lamination work. The structure of the stage elliptical cross-section structure is complicated, the mold manufacturing is troublesome, the number of stages of the iron core is relatively large, and the length of the conductor increases, thereby increasing the no-load loss and the weight of the wire, and increasing the manufacturing cost of the transformer.

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