CN101651020B

CN101651020B - Wire and foil mixedly winding coil grounding transformer

Info

Publication number: CN101651020B
Application number: CN2009100175700A
Authority: CN
Inventors: 顾建伟; 路卫涛; 刘海东
Original assignee: Ji'nan Jibian Zhiheng Electrical Equipment Co Ltd
Current assignee: Ji'nan Jibian Zhiheng Electrical Equipment Co Ltd
Priority date: 2009-08-05
Filing date: 2009-08-05
Publication date: 2011-07-20
Anticipated expiration: 2029-08-05
Also published as: CN101651020A

Abstract

The invention belongs to the field of dry type reactor, in particular to a wire and foil mixedly winding coil grounding transformer, comprising an iron core, a high pressure coil and a support frame, wherein, the high pressure coil comprises an inner coil and an outer coil; an airway is arranged between the inner coil and the outer coil; the inner coil adopts an enameled flat type copper wire as a conductor to wind in separated layers; a vacuum dipping glass grating plate is arranged between each layer; an inner connecting terminal which is used for coating a high pressure shrinkable tube is arranged respectively at two ends of the inner coil; the outer coil adopts copper foil to serve as the conductor to wind in separated layers; an electric insulating basal membrane is arranged between each circle; the two ends of the outer coil are provided with outer connecting terminals; the middle part is provided with a tapping terminal; and the inner side of the inner coil, the inner side and the outer side of the outer coil are respectively wound with an insulating layer. In the invention, the interturn capacitance of the transformer is distributed in equalization; and the invention has excellent electric insulating performance of no partial discharge and thunder impact resistance and is mainly applied to a 10-35 kV power grid grounding protection system.

Description

Wire and foil mixedly winding coil grounding transformer

Technical field

The invention belongs to the dry reactor field, specifically a kind of wire and foil mixedly winding coil grounding transformer.

Background technology

Grounding transformer is called the neutral point coupler again, is three-phase transformer (or three-phase reactor), be used for for the earth-free point of network system provide one artificial, can load-carrying neutral point, use for system earth.The key structure high-tension coil of existing dry-type earth transformer all adopts the copper cash coiling, and the high-tension coil of copper cash coiling exists electric capacity skewness on the coil, the shortcoming that the lightning impulse resistant performance is on the weak side.

Summary of the invention

The objective of the invention is to overcome the deficiencies in the prior art provides a kind of wire and foil mixedly winding coil grounding transformer, and this transformer turn-to-turn capacitance distributes impartial, has that no office puts, the superior electrical insulation property of anti-lightning impulse.

The present invention solves the problems of the technologies described above the technical scheme that is adopted to be: this kind wire and foil mixedly winding coil grounding transformer, comprise iron core, high-tension coil and bracing frame, described high-tension coil comprises inner coil and outer coil, is provided with air flue between inner coil and outer coil; Described inner coil adopts the enamel-cover flat type copper wire as conductor layering coiling, is provided with the vacuum impregnation glass plate grid between each layer, is respectively equipped with the internal layer binding post that coats a hot high pressure draw at the two ends of inner coil; Described outer coil adopts Copper Foil as conductor segmentation coiling, is provided with the electric insulation basement membrane between each circle, and the two ends of outer coil are provided with outer binding post, and the middle part is provided with tap terminals; Be wound with an insulating barrier respectively in the inboard of inner coil, the inboard and the outside of outer coil.

The invention has the beneficial effects as follows: inner coil adopts copper conductors to be convenient to lift one's head be connected with lead-in wire; Outer coil adopts the Copper Foil conductor, has only a circle electromotive force (about 10V) between every cake adjacent turn, the highest turn-to-turn voltage (maximum voltage can reach the kV level between laminar winding adjacent turn) far below wound coil, the operating voltage that layer insulation is born is low more, its electric property is good more, insulating material is easier to satisfy instructions for use, thereby makes transformer reach the target of no partial discharge; When winding suffers lightning surge, owing to be subjected to the influence of winding-to-earth capacity shunting action, it is many that first section voltage is distributed, terminal voltage distributes few, adopt many that relative its winding-to-earth capacity of wire-wound structure of vertical (series connection) electric capacity of the outer coil of paper tinsel formula winding will be big, therefore lightning impulse voltage distributes better, the Potential distribution of winding each point is more even, initial distribution and steady-state distribution difference under the surge voltage are less, thereby suppressed the concussion of starting voltage, improved anti-lightning impulse intensity.Transformer of the present invention is easy on the advantage basis that outlet connects keeping the copper coiling, possessed simultaneously paper tinsel formula high-tension coil turn-to-turn capacitance distribute impartial, no office puts, the superior electrical insulation property of anti-lightning impulse.

Description of drawings

Fig. 1 is a structural representation of the present invention.

Fig. 2 is the side sectional structure schematic diagram of high-tension coil.

Among the figure, 1, iron core; 2, high-tension coil; 21, inner coil; 211, vacuum impregnation glass plate grid; 212, internal layer binding post; 22, outer coil; 221, electric insulation basement membrane; 222, outer binding post; 223, tap terminals; 3, bracing frame; 4, air flue.

Embodiment

As shown in Figure 1, this kind wire and foil mixedly winding coil grounding transformer comprises iron core 1, high-tension coil 2 and bracing frame 3.

As shown in Figure 2, described high-tension coil 2 comprises inner coil 21 and outer coil 22, is provided with air flue 4 between inner coil 21 and outer coil 22, and these air flue 4 axial thorough coils have improved the heat radiation and the capability of overload of coil.Described inner coil 21 adopts the enamel-cover flat type copper wire as conductor layering coiling, is provided with vacuum impregnation glass plate grid 211 between each layer, is respectively equipped with the internal layer binding post 212 that coats a hot high pressure draw at the two ends of inner coil 21; Described outer coil 22 adopts Copper Foil as conductor segmentation coiling, is provided with electric insulation basement membrane 221 between each circle, and the two ends of outer coil 22 are provided with outer binding post 222, and the middle part is provided with tap terminals 223; Be wound with an insulating barrier respectively in the inboard of inner coil 21, the inboard and the outside of outer coil 22.

The high-tension coil processing technology is as follows: coiling one deck vacuum impregnation glass plate grid 211 begins coiling inner coil 21 then as the insulating barrier of inner coil 21 inboards on mould earlier.After inner coil 21 coilings are finished, place gas channel formation mould thereon, coiling one deck vacuum impregnation glass plate grid 211 and five layers of electric insulation basement membrane 221 are as the insulating barrier of outer coil 22 inboards successively, twine simultaneously with Copper Foil and one deck electric insulation basement membrane 221 then, the wire turn of last each Copper Foil is all after finishing, again around the insulating barrier of one deck vacuum impregnation glass plate grid 211 as the outer coil outside.The outer binding post 222 of high-tension coil and tap terminals 223 adopt copper sheathing with Copper Foil and the crimping of circle copper rod, are welded on the copper nut and draw, and pour into an integrated entity with insulating resin at last and make.

Claims

1. a wire and foil mixedly winding coil grounding transformer comprises iron core, high-tension coil and bracing frame, it is characterized in that, described high-tension coil comprises inner coil and outer coil, is provided with air flue between inner coil and outer coil; Described inner coil adopts the enamel-cover flat type copper wire as conductor layering coiling, is provided with the vacuum impregnation glass plate grid between each layer, is respectively equipped with the internal layer binding post that coats a hot high pressure draw at the two ends of inner coil; Described outer coil adopts Copper Foil as conductor segmentation coiling, is provided with the electric insulation basement membrane between each circle, and the two ends of outer coil are provided with outer binding post, and the middle part is provided with tap terminals; Be wound with an insulating barrier respectively in the inboard of inner coil, the inboard and the outside of outer coil.