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Wire outlet structure of high-impedance transformer, and high-impedance transformer

A high-impedance transformer and package structure technology, applied in the field of transformer manufacturing, can solve problems such as partial discharge, unreasonable structure of the high-voltage winding end outlet, and achieve the effects of solving temperature rise, operability and strength, and easy implementation.

Active Publication Date: 2017-04-05
特变电工湖南工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In engineering practice, it is easy to cause partial discharge due to the u

Method used

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  • Wire outlet structure of high-impedance transformer, and high-impedance transformer
  • Wire outlet structure of high-impedance transformer, and high-impedance transformer
  • Wire outlet structure of high-impedance transformer, and high-impedance transformer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] This embodiment provides a high-impedance transformer for a voltage level of 220kV. In this high-impedance transformer, the outlet structure adopts Figure 1-3 The outlet structure shown.

[0046] In this example, figure 1 The outlet structure of the high-impedance transformer disclosed in is specifically the outlet structure of the end leads of the high-voltage winding. The outlet structure of the high-impedance transformer includes an insulating protective layer covering the end leads of the high-voltage winding, the insulating protective layer includes an oil flow channel and an insulating layer, and the oil flow channel and the insulating layer are respectively formed by a butt joint structure, The butt joint position of the oil flow channel and the joint position of the insulating layer are staggered from each other.

[0047] see figure 1 In this embodiment, the protection section of the end lead of the high voltage winding specifically refers to the part of the...

Embodiment 2

[0072] The difference between the outlet structure of the high-impedance transformer in this embodiment and the outlet structure in Embodiment 1 lies in that in this embodiment, the structure of the inner insulation protection layer in the insulation protection layer is different.

[0073] In this embodiment, the inner insulating protection layer includes only the first oil flow channel and the first insulating layer arranged sequentially from the inside to the outside, without the second oil flow channel and the second insulating layer, and the first oil flow channel and the second insulating layer are not provided. The size of the flow channel along its radial direction can be appropriately increased relative to the size in Example 1.

[0074] Other structures of the outgoing line structure in this embodiment are the same as the outgoing line structure in Embodiment 1, and will not be repeated here.

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Abstract

The invention discloses a wire outlet structure of a high-impedance transformer, and a high-impedance transformer. The wire outlet structure comprises an insulation protective layer wrapping an end-portion lead wire of a high-voltage winding, the insulation protective layer comprises an oil-flow channel and an insulation layer, the oil-flow channel and the insulation layer are each formed by use of a butt joint structure, and the butt joint position of the oil-flow channel is mutually staggered from the butt joint position of the insulation layer. The wire outlet structure is reasonable in structure and high in reliability and does not generate partial discharge.

Description

technical field [0001] The invention belongs to the technical field of transformer manufacturing, and in particular relates to an outlet structure of a high-impedance transformer and a high-impedance transformer including the outlet structure. Background technique [0002] The use of high-impedance transformers is one of the effective measures to reduce transformer short-circuit current and improve short-circuit resistance in large-capacity power systems. At present, for high-impedance transformers with built-in high-voltage windings, the winding arrangement adopts the insulation structure of iron core-high-voltage winding-medium-voltage winding-voltage regulating winding-low-voltage winding. Since the high-voltage winding is close to the iron core, the diameter of the high-voltage winding is small, the DC resistance is small, the loss is reduced, and the volume and weight are reduced, and the cost is reduced. Therefore, transformers with this structure are widely used in va...

Claims

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Application Information

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IPC IPC(8): H01F27/32H01F27/29
Inventor 宁朝辉李春常刘金波田国华李先巧陆帅
Owner 特变电工湖南工程有限公司