Dry-type transformer

Abstract

The invention discloses an open rolled iron core dry-type transformer. The dry-type transformer comprises an iron core which is three-phase and three-column. The cross-section shapes of three core columns of the iron core are rectangular open rolled iron cores. Each layer is provided with two fractures, and the fractures are arranged at the three core columns. A low-voltage coil is arranged in the three core columns of the iron core, an insulating layer is tightly fixed outside the low-voltage coil, a high-voltage coil is arranged outside the insulating layer, an upper clamp piece and a lower clamp piece are fixed on the iron core, and the iron core draw a high-voltage terminal and a low-voltage terminal. The dry-type transformer has the advantages of being short in magnetic circuit, high in power factor, small in size, strong in sudden short circuit resistance, good in process condition and the like.

Description

technical field [0001] The invention relates to the field of transformer manufacturing, in particular 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. Wound core, also known as roll core, is made of silicon steel strip with a certain shape. Compared with laminated core, the performance of roll core is improved, mainly reflected in low no-load loss and low no...

AI Technical Summary

Problems solved by technology

However, due to the seamless structure of the coiled iron core, there are also many problems, such as: the production capacity of the manufacturing equipment is limited, and special winding equipment is required when winding the iron core coil, and the winding must be carried out with the iron core. Difficult, complicated process and low production efficiency

Maintenance is even more difficult. Once the coil of the transformer fails, the coil cannot be removed from the iron core for replacement, which will inevitably cause the entire transformer to be scrapped.

Due to the above shortcomings, the promotion and use of seamless rolled iron cores are restricted

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