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Dry transformer

A technology for dry-type transformers and transformer cores, which is applied in the directions of transformer/inductor cores, transformer/inductor coils/windings/connections, etc., and can solve the problem of low-performance dry-type power transformers with laminated cores. Problems such as manufacturing of type power transformers, to achieve strong anti-sudden short-circuit capability, reduced loss, and solve the effects of non-maintenance

Inactive Publication Date: 2008-10-01
齐会南
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AI Technical Summary

Problems solved by technology

[0003] The present invention provides a dry-type transformer whose iron core is an open wound iron core with an elliptical cross-section, which completely solves the problem of low performance of laminated iron core dry-type power transformers and the problem of dry-type power transformers with wound iron cores. Problems in Transformer Manufacturing

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Embodiment Construction

[0021] specific implementation plan

[0022] see figure 1 , figure 2 , the transformer core consists of two open coil cores (1) and (2) placed side by side with a "mouth" shape and a concave semi-elliptical cross-section to form a horizontal "day" rectangular frame. The shape is a big "mouth" and the cross-section is convex semi-elliptic with an open roll iron core rectangular frame (3) wrapping the Japanese-shaped frame inside it. see image 3 , the cross-sections of the three core columns of the iron core are elliptical by joining two concave semi-elliptical shapes and one convex semi-elliptical shape, and the cross-sections of the three core columns of the assembled iron core are all oval. 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, instead of cutting the wound iron cores layer by layer. see Figure 4 , if the cross-sectional shape of each single-phase open coil core is...

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Abstract

A dry power transformer comprises an iron core, a low-voltage coil (13), an insulative layer (14), an upper clip member (10), a lower clip member (11), a high-voltage connecting terminal (16) and a low-voltage connecting terminal (12). The iron core is configured that a two-square-shaped rectangular frame is constructed by abreast arranging two open rolled iron cores with square shapes and indent semiellipse sections, and the two-square-shaped rectangular frame is packaged in an open rolled iron core rectangular frame with a convex semiellipse section. The sections of three columns of the iron core after assembling can be ellipses, step shapes (external ellipses) or polygons (external ellipses). Because of the open characteristic of the iron core, the coil can be winded singly. The coil can be mounted or replaced by opening the iron core at a U-shaped position of an open slot during production and maintaining, so that the whole process is convenient.

Description

Technical field [0001] The invention relates to a dry-type transformer. Background technique [0002] Dry-type transformers are mainly composed of iron cores and coils. At present, the iron core structures of traditional dry-type 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 seamless str...

Claims

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Application Information

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