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Shielding ring, shielding structure and casting type voltage transformer

A technology of voltage transformers and shielding rings, applied in inductors, transformers, magnetic field/electric field shielding, etc., can solve the problems of irregular deformation of metal shielding rings, low product casting qualification rate, inconsistent shrinkage, etc., to avoid air gaps. or cracking, ensuring the casting quality and shielding effect, and improving the casting qualification rate

Inactive Publication Date: 2017-12-08
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, most of the primary winding ends of cast-type voltage transformers used in high-voltage power systems have no shielding structure, which causes the electric field concentration at the primary winding ends. ; Some manufacturers try to add a metal shielding ring to the end of the primary winding before pouring, but because the shrinkage of the metal is inconsistent with that of the epoxy resin during cooling, the metal shielding ring is irregularly deformed or deformed when the product is cooled after pouring. There are air gaps or product cracks, and the product still has the problem of low pouring pass rate

Method used

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  • Shielding ring, shielding structure and casting type voltage transformer
  • Shielding ring, shielding structure and casting type voltage transformer
  • Shielding ring, shielding structure and casting type voltage transformer

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Embodiment Construction

[0022] Embodiments of the casting type voltage transformer of the present invention, such as Figure 1-4 As shown, the cast-type voltage transformer includes an annular iron core 1 and a primary winding 2 wound on the upper side of the iron core 1. Both ends of the outer circle of the primary winding 2 are provided with shielding rings. The shielding ring includes a circular cross-section The rubber ring 3, the outer half of the rubber ring 3 is wrapped with semi-conductive crepe paper 4, the rubber ring 3 is made of EPDM rubber material, and its inner diameter is smaller than the outer diameter of the primary winding 2mm; the shielding ring is bonded to the primary winding 2 with conductive adhesive At the end of the outer circle, the conductive glue ensures the reliable connection between the rubber ring 3 and the primary winding 2 .

[0023] The casting type voltage transformer of the above embodiment is provided with a shielding ring at the outer circular end of the primar...

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Abstract

The invention discloses a shielding ring, a shielding structure and a casting type voltage transformer. The shielding ring includes a rubber ring and a shielding layer formed of semi-conductive crepe paper is arranged on the peripheral surface of the rubber ring; because the semi-conductive crepe paper is high The conductor of the resistor can achieve the shielding effect. The use of the rubber ring enables the shielding ring to have the ability to elastically deform. On the one hand, it uses its own elasticity to fix the shielded body when in use; In the transformer, elastic shrinkage can occur with the cooling and shrinkage of the casting body, which will not affect the shielding effect and the casting quality.

Description

technical field [0001] The invention relates to a shielding ring, a shielding structure and a casting type voltage transformer. Background technique [0002] At present, most of the primary winding ends of cast-type voltage transformers used in high-voltage power systems have no shielding structure, which causes the electric field concentration at the primary winding ends. ; Some manufacturers try to add a metal shielding ring to the end of the primary winding before pouring, but because the shrinkage of the metal is inconsistent with that of the epoxy resin during cooling, the metal shielding ring is irregularly deformed or deformed when the product is cooled after pouring. Air gaps or product cracks are generated, and the product still has the problem of low pouring pass rate. Contents of the invention [0003] The purpose of the present invention is to provide a shielding ring that can solve the electric field concentration at the end of the primary winding of the cast...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K9/00H01F38/24H01F27/36
Inventor 李阳
Owner STATE GRID CORP OF CHINA
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