CN2726079Y

CN2726079Y - Shield structure of transformer high-voltage coil tap lead wire

Info

Publication number: CN2726079Y
Application number: CN 200420068585
Authority: CN
Inventors: 邓海生
Original assignee: TBEA Hengyang Transformer Co. Ltd
Current assignee: TBEA Hengyang Transformer Co. Ltd
Priority date: 2004-09-01
Filing date: 2004-09-01
Publication date: 2005-09-14
Anticipated expiration: 2014-09-01

Abstract

The utility model belongs to the technical field of the transformer, relating to a shielding structure of transformer high-voltage coil tap lead wire, which is a shielding structure capable of effectively decreasing the field strength of the surface of the transformer high-voltage coil tap lead wire. The shielding structure of the transformer high-voltage coil tap lead wire comprises a lead wire and a copper pipe, also comprising a metal conductive wire and a metal crepe paper. A crepe paper is coated outside the lead wire and the copper pipe, of which the outer layer is coated with one layer of half metal crepe paper with an outward metal face and then is placed a metal conductive wire which is coated with one layer of half crepe paper with an inward metal face, and two layers of metal crepe papers are closely contacted with the metal conductive wire, finally, the outer side of the metal crepe paper is coated with one layer of crepe paper.

Description

Transformer high-voltage coil lift one's head the lead-in wire shielding construction

Technical field

The utility model belongs to the transformer technology field, relates to a kind of transformer high-voltage coil and lifts one's head the shielding construction of lead-in wire, is that a kind of transformer high-voltage coil that can effectively reduce is lifted one's head the shielding construction of wire surface field intensity.

Background technology

Along with the raising of transformer voltage grade, the insulation distance of transformer lead and the size of partial discharge quantity, all the uniformity coefficient with the lead-in wire field intensity has very big relation, promptly with the radius of curvature of wire surface, the smooth degree of wire surface very big relation is arranged.In general, it is exactly the processed that lead-in wire electrode outer surface is carried out smooth, roundingization and strengthens the electrode curvature radius that high-tension coil is lifted one's head the shield technology of lead-in wire, therefore, high-tension coil is lifted one's head the shielding of lead-in wire and is broadly divided into two kinds: a kind of is that the lead-in wire electrode surface carry out shapedization, and another kind of is exactly in order to increase the radius of curvature of lead-in wire electrode.

Existing high-tension coil is lifted one's head the lead-in wire treatment technology in, the general structure that adopts as shown in Figure 1, promptly in the junction of lifting one's head and going between of high-tension coil, diameter of overcoat is about 80mm and the smooth copper suitable shape of lead-in wire trend, copper pipe has one to be connected reliably with high-voltage connection on electric, like this, copper pipe is in operation and just can cause discharge because of occurring suspending, this structure can effectively reduce the electric field strength of lead-in wire electrode surface, lifts one's head to go between to shield extensively at the EHV transformer high-tension coil and adopts.But, also there is significant disadvantages in this structure, one is to make complexity, and the accuracy of manufacture is difficult to guarantee, for improving the electric field situation between copper pipe and the high-tension coil, at close winding protruding head position, copper pipe will be made an inside flange that certain R radius is arranged, and the other end then closes up into cone, and, the copper pipe shape that cabling adapts of must making and go between; Another is exactly to guarantee the dimensional requirement of assembling, because copper pipe must be according to the theoretical size manufacturing completion of drawing, and the rigging error of the dimensional discrepancy of winding protruding head and device body phase suit, the suitable shape of inevitable copper pipe can not guarantee the installation accuracy that goes between, even causes and can't install.

The utility model content

Technical problem to be solved in the utility model is the above-mentioned defective that exists at prior art, the shielding construction that provides a kind of transformer high-voltage coil to lift one's head lead-in wire.

Solving technical scheme that the utility model technical problem adopted and be this transformer high-voltage coil lifts one's head the shielding construction of lead-in wire and comprises lead-in wire, copper pipe, also include plain conductor, metal wrinkled paper, at described lead-in wire and copper pipe outsourcing crimped paper is housed, skin at crimped paper, add and face repeatedly one deck of outer metal wrinkled paper half covered with gold leaf the genus, place one of plain conductor then, then add metal wrinkled paper half one deck repeatedly that belongs in facing covered with gold leaf, double layer of metal crimped paper closely contacts with plain conductor, adds bag one deck crimped paper in metal wrinkled paper outside at last.

Description of drawings

Fig. 1 is the prior art constructions schematic diagram;

Fig. 2 is the structural representation of the utility model embodiment;

Fig. 3 is an AA profile among Fig. 2.

The accompanying drawing mark:

The 1-copper pipe 2-lead-in wire 3-flat type copper wire 4-aluminium foil 5-crimped paper that takes all of

The metal wrinkled paper of the metal wrinkled paper of 6-(metal covering inwardly) 7-(metal covering outwardly)

Embodiment

Below in conjunction with this accompanying drawing the utility model embodiment is described in further detail.

See also Fig. 2 and Fig. 3, Fig. 2 is the structural representation of the utility model embodiment, Fig. 3 is an AA profile among Fig. 2, as can be seen from the figure its embodiment is the junction of lifting one's head and going between at high-tension coil, according to common process to the shapedization processing that goes between, adding bag insulating barrier to diameter wire is about 80mm, add the repeatedly one deck of crimped paper 7 half that belongs to covered with gold leaf, require metal covering outwardly, plain conductor use in the present embodiment is flat type copper wire 3 then, it is placed as figure, then adds the repeatedly one deck of crimped paper 6 half that belongs to covered with gold leaf, requires metal covering inwardly, make double layer of metal crimped

paper

6,7 closely contact with flat type copper wire 3, because the making of this structural leadthroughs is after device body phase suit,, can avoid the rigging error of the dimensional discrepancy of winding protruding head and device body phase suit and the lead-in wire alignment error that causes according to the real lead-in wire trend of joining of physical location.

Claims

1. a transformer high-voltage coil is lifted one's head the shielding construction of lead-in wire, comprise lead-in wire, copper pipe, it is characterized in that also including plain conductor, metal wrinkled paper, at described lead-in wire and copper pipe outsourcing crimped paper is housed, skin at crimped paper, add and face repeatedly one deck of outer metal wrinkled paper half covered with gold leaf the genus, place one of plain conductor then, then add metal wrinkled paper half one deck repeatedly that belongs in facing covered with gold leaf, double layer of metal crimped paper closely contacts with plain conductor, adds bag one deck crimped paper in metal wrinkled paper outside at last.

2. transformer high-voltage coil according to claim 1 lift one's head the lead-in wire shielding construction, it is characterized in that described plain conductor is a flat type copper wire.