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A method for wrapping and connecting the main insulation of an oil-immersed inverted current transformer

A current transformer and main insulation technology, applied in the direction of inductors, transformers/inductor coils/windings/connections, inductors/transformers/magnets, etc., can solve problems such as unstable quality and low wrapping efficiency, and improve the overall The effect of quality, simple structure and reasonable process

Active Publication Date: 2017-12-15
BAODING TIANWEI TRANSFORMER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main insulation of the oil-immersed inverted current transformer is wrapped outside the secondary winding, usually by manual wrapping, the wrapping efficiency is low, and the quality is unstable

Method used

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  • A method for wrapping and connecting the main insulation of an oil-immersed inverted current transformer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0034] Embodiment: Take a 110kV current transformer as an example to design a stepped gradient. Withstand short-time power frequency voltage U s Take 230kV, the insulation axial power frequency allowable field strength E l Take 1.25kV / mm, the total length L of the stepped difference C ≥U s / E l =230 / 1.25=184mm, take L C =200mm, divided into 10 equal-length stepped surfaces, the length of each stepped surface is S= L C / n =200 / 10=20mm, the starting radius of the main insulation wrapping r C Take 31.4mm, take the finished radius R of the main insulation wrapping as 57.7mm, then the radius y of the first stepped surface from inside to outside 1 =r C (R / r C ) 1 / n =31.4 (57.7 / 31.4) 1 / 10 =33.4mm, and so on 2 =35.5mm,y 3 =37.7mm,y 4 =40.1mm,y 5 =42.6mm,y 6 =45.3mm,y 7 =48.1mm,y 8 =51.1mm,y 9 =54.3mm,y 10 =57.7mm.

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Abstract

The invention relates to an oil-immersed inversion type current transformer major insulation wrapping connection structure and method, and belongs to the technical field of instrument transformer manufacture. The oil-immersed inversion type current transformer major insulation wrapping connection structure is characterized in that a lead part main insulator of a lead tube (1) is wrapped by a whole piece of cable paper, or is wrapped in a half-folding mode by a cable paper tape or wrinkle paper tape through machine wrapping; a ring major insulator is wrapped after the lead part major insulator of the lead tube (1) is wrapped; the ring major insulator is wrapped by adopting a machine or manpower, and is connected with the lead part major insulator; the lead part major insulator is of a partial pressure structure of multiple terminal screens, and stair-shaped stair differences with equal length and unequal thicknesses are reserved to be favorable for connection with the ring major insulator. The oil-immersed inversion type current transformer major insulation wrapping connection structure has the positive effects that the lead part major insulator uses machine wrapping, the wrapping quality and the wrapping efficiency are improved, the structure is simple, the technology is reasonable, and the whole quality of a product is improved.

Description

technical field [0001] The invention relates to a method for wrapping and connecting the main insulation of an oil-immersed inverted current transformer, and belongs to the technical field of transformer manufacturing. Background technique [0002] Oil-immersed current transformers are divided into oil-immersed vertical current transformers and oil-immersed inverted current transformers. The main insulation of oil-immersed vertical current transformers is wrapped outside the primary winding, and the primary winding is generally "U". shape, the main insulation wrapping is done by machine. The main insulation of the oil-immersed inverted current transformer is wrapped outside the secondary winding, usually by manual wrapping, the wrapping efficiency is low, and the quality is unstable. Contents of the invention [0003] The purpose of the present invention is to provide a method for wrapping and connecting the main insulation of an oil-immersed inverted current transformer....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F38/30H01F27/28H01F27/36H01F27/32H01F41/12
CPCH01F27/288H01F27/324H01F38/30H01F41/125
Inventor 张伟明薛晚道王文娣孟令徐君江金星
Owner BAODING TIANWEI TRANSFORMER CO LTD