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A shield suitable for epoxy resin casting winding and its manufacturing method

A manufacturing method and epoxy resin technology, applied in the direction of preventing/reducing unwanted electric/magnetic influences, etc., can solve problems such as poor, easy-to-crack shielding effect, etc., achieve simple structure, avoid wrinkles and sharp corners, Good shielding effect

Active Publication Date: 2020-05-19
NANJING NARI GROUP CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Purpose of the invention: In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a shielding structure suitable for epoxy resin casting type dry-type transformer windings and its manufacturing method, so as to solve the problem that the epoxy resin casting winding is easy to install after shielding Problems with cracking and poor shielding make transformers more suitable for harsh power supply environments

Method used

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  • A shield suitable for epoxy resin casting winding and its manufacturing method
  • A shield suitable for epoxy resin casting winding and its manufacturing method
  • A shield suitable for epoxy resin casting winding and its manufacturing method

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0021] Such as figure 1 and figure 2 , a shielding structure suitable for epoxy resin casting dry-type transformer windings disclosed in the embodiment of the present invention, mainly includes a shielding main body 1 and an alkali-free and wax-free glass fiber cloth 2 on both sides; wherein the shielding main body 1 includes a shielding layer 1-1 and the ground copper strip 1-2 connected thereto.

[0022] Such as figure 2 The shielding layer 1-1 of the shielding main body 1 is an insulating material (such as DMD, PET, SHS, etc.) with a thickness of 0.15 to 0.3mm in F or H grade, and a conductive coating (such as Cu, Ag, Ag / Cu series conductive paint), the conductive coating is composed of several strip-shaped conductive strips, and several shielding rings are formed after the roll is rolled up to reduce eddy current loss. The width A of ...

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Abstract

The invention discloses a shield suitable for an epoxy resin casted winding and a manufacturing method thereof. The shield comprises a shielding body and alkali-free wax-free glass fiber cloths liningthe two sides of the shielding body; the shielding body comprises a shielding layer and a grounding copper strip connected to the shielding layer; and the shielding layer formed by coating conductivecoatings on an upper surface and / or a lower surface of an F or H grade 0.15-0.3 mm-thick insulating material. The integrated shielding structure of the invention has the advantages of a simple structure, easy operation and overall flatness, thereby avoiding the existence of wrinkles and sharp corners and realizing better fusion with the epoxy resin without cracking. The integrated shielding structure of the invention is vacuum-casted together with the wound winding with epoxy resin, thereby achieving good shielding effect and small eddy current loss.

Description

technical field [0001] The invention belongs to the technical field of dry-type power transformers, and relates to a shielding structure of epoxy resin pouring type dry-type transformer windings and a manufacturing method thereof. Background technique [0002] Dry-type transformers are safer and more environmentally friendly power products than oil-immersed transformers, and are used in densely populated places such as high-rise buildings. Dry-type transformers are solid-gas mixed insulation. The dielectric coefficient of epoxy resin is high, and the dielectric coefficient of air is small. Therefore, partial discharge is prone to occur in the air. This phenomenon is more severe in dry-type transformers of 35kV and above. protrude. At the same time, the winding shielding structure commonly used in oil-immersed transformers is rarely used in dry-type transformers. One of the reasons is that the shielding structure does not match the epoxy resin or the process is difficult to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F27/36
CPCH01F27/36
Inventor 张志立潘有龙黄健赵仰东柳涛杨文清邵传益周小华
Owner NANJING NARI GROUP CORP