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Dry power transformer

A technology of power transformers and transformers, which is applied in the direction of transformers, fixed transformers, transformer/inductor cores, etc., can solve the problems of dry-type power transformers with low performance and manufacturing of dry-type power transformers with winding cores, and achieve sudden short-circuit resistance Strong ability, good craftsmanship and high production efficiency

Inactive Publication Date: 2008-09-24
齐会南
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention designs a dry-type power transformer whose iron core is an open-rolled iron core, which completely solves the problems of low performance of the laminated iron-core dry-type power transformer and the manufacturing process of the wound-core dry-type power transformer

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Embodiment Construction

[0020] specific implementation plan

[0021] see figure 1 The opening of the iron core is formed by cutting the silicon steel strip layer by layer and winding it evenly. The opening position can be on the upper yoke (4) and (5). The open-rolled iron cores (1) and (2) with a concave semicircular cross-section are placed side by side to form a rectangular frame in the shape of a horizontal "日", and the other open-rolled iron core rectangular frame with a convex semi-circular cross-section Body (3) wraps (1), (2) in it. see Figure 4 , the cross-sections of the three core columns of the open-rolled iron core are circular by joining two concave semicircles and one convex semi-circle, and the cross-sections of the three core columns of the assembled iron core are all circular. The three single-phase iron cores used to wind the entire iron core are all formed by continuous winding of silicon steel strips after cutting. see Figure 5 , if the cross-sectional shape of each single...

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Abstract

The invention provides a dry-typed electric transformer, comprising an iron core, a low-voltage coil (13), an insulation layer (15), a high voltage coil (14), an upper clamping part (12), a lower clamping part (11), a high voltage wiring terminal (16) and a low voltage wiring terminal (10). The iron core is formed by that two open coiled iron cores with O-shaped appearance and internally concave semi-round section are arranged in parallel to form a transverse theta-shaped rectangle frame; another open coiled iron core rectangle frame with externally convex semi-round section wraps the transverse theta-shaped rectangle frame. The section of three columns of assembled iron core can be round or step-shape (circumcircle shape) or polygon (circumcircle). As the iron core has opening characteristic, the coil can be enwound separately, and the iron core at the U-shaped opening gap can be opened to carry out the installation or to replace the coil during the production and maintenance, thus leading the whole process to be convenient and fast.

Description

Technical field [0001] The invention relates to a dry-type power transformer. Background technique [0002] Dry-type power transformers are mainly composed of iron cores and coils. At present, the core structures of traditional dry-type power transformers in China are laminated and wound. The laminated iron core is formed by stacking silicon steel sheets. Since the laminated iron core has many oblique joints at the joints of each layer, it will increase the reluctance and iron loss, and make the excitation of the transformer The current also increases, which reduces the power factor and seriously affects the power supply quality of the grid. The existence of iron core joints also leads to the problem of high operating noise. The wound core is made of silicon steel strips of a certain shape. Compared with the laminated core, the performance of the wound core is improved to a certain extent, which is mainly reflected in the low no-load loss and low noise. However, due to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F27/24H01F27/28H01F30/06
Inventor 齐会南
Owner 齐会南
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