Novel low-voltage external coil structure

Abstract

The invention discloses a novel low-voltage external coil structure which comprises a paper tube, an inner supporting strip, a coil cake and an outer supporting strip. The inner supporting strip is fixed to the inner side of the paper tube, the outer supporting strip and the inner supporting strip are arranged oppositely, a coil is arranged between the inner supporting strip and the outer supporting strip, and the coil cake is wound with a coil. A selecting mode that the number of traditional coil turns is an integer or 0.5 is changed, and a selecting mode that the number is 0.75 is achieved. The selecting problem of the number of low-voltage coil cakes of a high-capacity transformer is solved, the problem of poor short-circuit resisting capacity of spiral outer coils is solved, and the economy of products is also improved while the product reliability is improved.

Description

technical field [0001] The invention relates to the technical field of low-voltage outer coils, in particular to a novel low-voltage outer coil structure. Background technique [0002] In power systems, we use various types of transformers to complete the transmission of electrical energy from power plants to consumers. With the rapid development of power equipment, the proportion of electricity in social and economic development and people's work and life is also increasing. As the demand for electricity increases, the capacity of the transformer will also increase. With the development of society and the improvement of people's living standards, higher requirements are placed on the quality of power supply. As an important part of transformer faults, short-circuit faults often cause huge damage. The industry is paying more and more attention to the research on the short-circuit resistance capability and improvement measures of transformers. With the rapid development of...

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Problems solved by technology

The low-voltage profile coil has fewer turns and a large current. When a single helix structure is adopted, the wire gauge width is large, and the eddy current loss caused by the lateral magnetic flux leakage at the end is large, which not only increases the loss of the product but also causes the temperature rise of the hot spot at the end to be too high; There are too many coil cakes in the spiral, and the width of the wire gauge is too small, resulting in insufficient axial bending strength of the coil cakes. The increase in the number of oil passages caused by the increase in the number of coil cakes reduces the economical efficiency of the coils, and the spiral outer coils all have The problem of insufficient short-circuit resistance in the amplitude direction

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