Oil-immersed inversion type current transformer major insulation wrapping connection structure and method
A technology of current transformer and connection structure, which is applied in the direction of inductor, transformer/inductor coil/winding/connection, inductor/transformer/magnet manufacturing, etc., which can solve the problems of low bandaging efficiency and unstable quality, and achieve simple structure , improve the overall quality, improve the effect of bandaging quality and bandaging efficiency
Active Publication Date: 2017-02-08
BAODING TIANWEI TRANSFORMER CO LTD
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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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Embodiment
[0034] Embodiment: Taking a 110kV current transformer as an example to design a step-like step difference. Withstand short-time power frequency voltage U s Taking 230kV, the axial power frequency allowable field strength of the insulation is 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 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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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 main insulation wrapping connection structure and method 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 main insulation wrapping connection structure and method of an oil-immersed inverted current transfor...
Claims
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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