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An extra-high voltage electric porcelain outer insulation outlet bushing

An outlet bushing and UHV technology, applied in the direction of insulators, insulators, lead-in/through-type insulators, etc., can solve the problems of easy occurrence of wet flashover and uneven distribution of external insulation voltage, and achieve improved wet flashover The effect of voltage and internal insulation electrical performance, production difficulty reduction, and reliability improvement

Active Publication Date: 2018-07-13
JIANGSU ZHIDA ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, since the grounding electrode will not be made too high, generally not more than 20% of the height of the porcelain sleeve (too high will cause the potential difference between the grounding electrode and the outer insulating surface of the porcelain sleeve to be too large and cause breakdown), so the voltage of the outer insulation The distribution is very uneven. Less than 20% of the height of the porcelain bushing at the lower end accounts for more than 50% of the distribution of the external insulation voltage. In the rainy state, the pagoda-like shape makes the rainwater at the lower end very dense, so the lower end is very prone to wet flashover

Method used

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  • An extra-high voltage electric porcelain outer insulation outlet bushing
  • An extra-high voltage electric porcelain outer insulation outlet bushing
  • An extra-high voltage electric porcelain outer insulation outlet bushing

Examples

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Embodiment Construction

[0030] The present invention will be further described in detail below in conjunction with examples. However, the invention is not limited to the examples given.

[0031] like figure 2 As shown, the UHV electric porcelain outer insulating outlet bushing of this embodiment has an upper porcelain sleeve 5 and a lower porcelain sleeve 6, and the upper and lower porcelain sleeves are fixed on the transition plate 7 through the intermediate flange, and the transition plate 7 is equipped with a pressure equalizing ring. The porcelain sleeve is filled with sulfur hexafluoride (insulating gas). The upper flange 2 is set on the top of the upper porcelain sleeve 5, the lower flange 1 is set on the bottom end of the lower porcelain sleeve 6 (the lower flange 1 is grounded, so the lower flange 1 is also called the grounding flange), and the grounding electrode 4 (can be Transition plate) is installed on the lower flange 1, and the ground electrode 4 is at the same potential as the lowe...

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Abstract

Disclosed is an ultra-high voltage electroceramics external-insulation lead-out bushing, which can be applied to such a device as an ultra-high voltage GIS, a tubular busbar and a circuit breaker. The bushing comprises a ceramic bushing, a grounding flange (1) and a conductive rod (3) arranged in the centre of the ceramic bushing. A cylindrical grounding electrode (4) is provided between the conductive rod (3) and the grounding flange (1). The ceramic bushing at least has two adjacent sub-bushings (5, 6). The sub-bushings (5, 6) are fixed to each other as a whole via a transition member (7). A cylindrical intermediate electrode (8) penetrating the sub-bushing (6) therebelow is provided between the grounding electrode (4) and the conductive rod (3). The intermediate electrode (8) is isolated from the grounding electrode (4) and the conductive rod (3). This solution can significantly improve the electrical performance of the bushing, and in particular, improve the wet flashover voltage, the bending strength, etc. of the bushing, while reducing manufacturing difficulties and manufacturing costs of the ultra-high voltage ceramic bushing.

Description

technical field [0001] The invention relates to an ultra-high voltage bushing, in particular to a porcelain jacket outlet bushing which can be used on busbars, GIS, circuit breakers and similar equipment. Background technique [0002] At present, there are two types of outer insulation for 550kV and above UHV circuit breakers and GIS outlet bushings: electric porcelain and composite. For outlet bushings with electric porcelain as the outer insulation, the porcelain bushings are basically tower-shaped structures (also known as cones). For 750kV products, the height is above 7m. Due to the technical characteristics of the molding and firing stages in the manufacturing process of the electric porcelain bushing, the height of the fired electric porcelain element does not exceed 2m, so the porcelain bushing of 550kV and above is made of several single-section porcelain bushings through inorganic bonding for secondary firing. The higher the porcelain piece, the higher the difficu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B17/28H01B17/36H01B17/58H01B17/42
CPCH01B17/28H01B17/36H01B17/42H01B17/583
Inventor 虞育号
Owner JIANGSU ZHIDA ELECTRIC
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