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A high voltage corona grading ring and a high voltage device comprising such ring

A technology of high-voltage corona and high-voltage equipment, which is applied to transformer/inductor components, circuits, electrical components, etc.

Inactive Publication Date: 2009-09-02
ABB TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the bending of the grading ring itself should guarantee more or less partial discharge (pd) free operation, small particles on such rings can lead to discharge behavior

Method used

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  • A high voltage corona grading ring and a high voltage device comprising such ring
  • A high voltage corona grading ring and a high voltage device comprising such ring
  • A high voltage corona grading ring and a high voltage device comprising such ring

Examples

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Embodiment Construction

[0022] Next, a detailed description of preferred embodiments of the present invention will be given. In this description, the term "high voltage" is used for voltages of 50KV and higher. Today, the upper limit in commercial high voltage installations is 800KV, but even higher voltages, such as 1000KV or higher, are also established or envisioned in the near future.

[0023] The present invention can be applied to reference figure 1 and figure 2 A general description of the high-voltage bushing arrangement given in the Background section, reference will be made to these figures below. However, first refer to the attached image 3 , image 3 A schematic cross-sectional view of an embodiment of a corona grading ring according to the invention is shown, wherein together with a part of the corona grading ring 10 a part of the hollow bushing insulator 2 and the upper external terminal 8 are shown. The corona grading ring is cylindrical or annular, like the corona grading rings...

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PUM

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Abstract

A high voltage corona grading ring for use with a high voltage device is disclosed, where the corona ring comprises an electrically conductive body arranged to be electrically connected to the high voltage device. The conductive body comprises a layer having reduced electrical conductivity.

Description

technical field [0001] The invention relates to a high-voltage corona pressure grading ring used together with high-voltage equipment. [0002] The invention also relates to a high voltage bushing comprising a bushing insulator. Background technique [0003] We already know that electrical installations and equipment like high-voltage transformers are usually equipped with bushings, which are adapted to carry current at high potential through a grounded barrier, such as a transformer box or a wall. [0004] Conventional bushings consist of an insulator made of ceramic or composite material, which has a shed and is generally hollow. Voltage equalization may be obtained with or without the capacitor body through which the electrical conductors pass. [0005] Examples of bushings suitable for use with high voltage DC transformers now refer to figure 1 and figure 2 Be explained, figure 1 The overall structure of the bushing is shown with reference number 1, figure 2 show...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B17/44H01B17/26H01F27/04
CPCH01F27/04H01F2027/329H01B17/44
Inventor R·哈丁斯
Owner ABB TECH AG
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