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External-expander capacitive voltage transformer and vacuum treatment method thereof

A technology of voltage transformers and expanders, applied in transformer/inductor cooling, inductors, circuits, etc., can solve the problems of oil leakage between bushing flange and cover, product performance increase, difficult to replace, etc., to reduce The effect of labor intensity, quality improvement and consumption saving

Active Publication Date: 2011-06-01
CHINA XD ELECTRIC CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the old-fashioned CVT uses an external oil-type expander, which is installed inside the porcelain bushing. If there is a problem, it is not easy to replace. Moreover, when the temperature rises, the pressure inside the porcelain bushing changes significantly. Oil leakage between the flange and the cover, and once a fault such as discharge occurs, the excess pressure generated may cause the porcelain bushing to withstand higher internal pressure, adding unstable factors to product performance

Method used

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  • External-expander capacitive voltage transformer and vacuum treatment method thereof
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  • External-expander capacitive voltage transformer and vacuum treatment method thereof

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Embodiment Construction

[0018] The present invention is described in further detail below in conjunction with accompanying drawing:

[0019] see figure 1 , the external expander type capacitor voltage transformer of the present invention includes a bushing 2 , a core 1 and an expander 3 . The core 1 is set in the casing 2 and sealed by the upper and lower covers 8 and 9 at both ends of the casing 2 , the expander 3 is set on the upper end of the cover 8 on the casing 2 , and the casing 2 is filled with insulating oil 4 . In addition, an end cover 7 for covering and sealing the expander 3 is provided on the upper cover 8 . The present invention adopts an external expander structure such as image 3 As shown, it is a disc-shaped box body made of corrugated board 10. A lower connection port 12 and a connection nut 11 are provided at the center of the lower end of the disc-shaped box body, and an upper connection port 13 is provided at the center position of the upper end of the disc-shaped box body. ...

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Abstract

The invention discloses an external-expander capacitive voltage transformer and a vacuum treatment method thereof. The voltage transformer comprises a casing, a core and an expander, wherein the core is arranged in the casing and is sealed by an upper sealing cover and a lower sealing cover at the two ends of the casing; the expander is arranged at the upper end of the upper sealing cover of the casing; and the casing is filled with insulating oil. An oil-filled expander is arranged outside a porcelain sleeve, so that the amount of oil and pressure inside the porcelain sleeve can be effectively adjusted, excessive pressure can be effectively released and the porcelain sleeve is safer and more stable. An external expander can have a small size and is arranged outside the porcelain sleeve, so that effective height of the porcelain sleeve is saved and the size and weight of a product are remarkably reduced. In the vacuum treatment method, drying, degassing, oil injection and soaking can be performed on each equipped product at one time, so that vacuum treatment time is shortened, labor intensity is lowered, the treatment capacity of insulating oil is reduced and the using amount of the insulating oil is decreased.

Description

technical field [0001] The invention belongs to the field of manufacturing and application of capacitive voltage transformers, and relates to a capacitive voltage transformer, in particular to an external expander type capacitive voltage transformer and a vacuum treatment method thereof. Background technique [0002] The types of traditional expanders are: bellows expander, laminated bellows expander, cartridge expander, series expander, internal oil expander and external oil expander. At present, the old-fashioned CVT uses an external oil-type expander, which is installed inside the porcelain bushing. If there is a problem, it is not easy to replace. Moreover, when the temperature rises, the pressure inside the porcelain bushing changes significantly. Oil leakage between the flange and the cover, and once a fault such as discharge occurs, the excess pressure generated may cause the porcelain bushing to withstand higher internal pressure, which adds unstable factors to produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F38/24H01F38/26H01F27/14G01R15/06
Inventor 郭晓风王香芳董轩
Owner CHINA XD ELECTRIC CO LTD
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