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Layer coil for oil-immersed distribution transformer and manufacturing method of layer coil

A distribution transformer, oil-immersed technology, applied in the field of transformers, can solve the problems of reduced insulation strength, complex coil process, easy to affect coil heat dissipation, etc., and achieve the effect of improving electrical insulation strength and simple process

Inactive Publication Date: 2016-09-07
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to ensure that the filling factor is increased without reducing the insulation strength, a positive angle ring is arranged at the end of the high-voltage coil in the traditional structure, but this structure makes the coil process complicated and easily affects the heat dissipation of the coil

Method used

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  • Layer coil for oil-immersed distribution transformer and manufacturing method of layer coil

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0020] like figure 1 As shown, a layered coil for an oil-immersed distribution transformer in this embodiment includes several layers of low-voltage coils 2 and high-voltage coils 1 wound in sequence inside and outside, and a main coil is formed between the high-voltage coil 1 and the low-voltage coil 2. Empty channel, characterized in that: the high-voltage coil 1 is wound on the outside of the main air channel, and the high-voltage coil 1 is wound with the first layer coil 10, the second layer coil 11 to the Nth layer sequentially from the inside to the outside Coils 12 and interlayer insulating layers 13 are respectively provided between two adjacent coils of the high-voltage coil 1. The upper and lower ends of the high-voltage coil 1 are respectively provided with a stepped insulating layer 5, and the thickness of the inner insulating layer...

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Abstract

The invention relates to a layer coil for an oil-immersed distribution transformer and a manufacturing method of the layer coil. The layer coil comprises multiple layers of low-voltage coils and high-voltage coils, which are sequentially wound from the inside to the outside, wherein a main empty path is formed between the high-voltage coils and the low-voltage coils; the high-voltage coils are wound on the outer side of the main empty path; the high-voltage coils are sequentially wound by a first layer of coil, a second layer of coil and an Nth layer of coil from the inside to the outside; an interlayer insulating layer is arranged between two adjacent coils of the high-voltage coils; stepped insulating layers are arranged at the upper ends and the lower ends of the high-voltage coils; and the thickness of the insulating layer at the inner side is greater than that of the insulating layer at the outer side. The layer coil for the oil-immersed distribution transformer has the beneficial effect that the electric insulation strength between the high-voltage coils and the low-voltage coils is improved.

Description

technical field [0001] The invention relates to the field of transformers, in particular to a layered coil for an oil-immersed distribution transformer and a manufacturing method thereof. Background technique [0002] The structure of the oil-immersed distribution transformer is relatively simple. The high and low voltage generally adopt layered coils. The high voltage coil is wound outside the low voltage coil. A main channel is set between the high and low voltage coils. The main channel adopts an insulating cardboard oil channel structure. In order to improve the filling factor of the wires in the core window, the size of the coil's end turns and the main empty channel is constantly shrinking. In order to ensure that the filling factor is increased without reducing the insulation strength, a positive-angle ring is arranged at the end of the high-voltage coil in the traditional structure, but this structure makes the coil process complicated and easily affects the heat dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F27/32H01F27/28H01F41/06H01F41/12
CPCH01F27/323H01F27/28H01F27/324H01F41/06H01F41/122H01F41/125
Inventor 陈伯根吴霆
Owner STATE GRID CORP OF CHINA
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