CN218513298U

CN218513298U - Novel magnetic shielding structure of transformer body

Info

Publication number: CN218513298U
Application number: CN202122761537.8U
Authority: CN
Inventors: 王春晓; 林波; 杨茜
Original assignee: Shandong Power Equipment Co Ltd
Current assignee: Shandong Power Equipment Co Ltd
Priority date: 2021-11-11
Filing date: 2021-11-11
Publication date: 2023-02-21
Anticipated expiration: 2031-11-11

Abstract

The utility model relates to a novel magnetic screen structure of transformer ware body is applied to three-phase five-column 220KV transformer, including the quadrangle extension board, quadrangle extension board symmetrical form install on the folder web of transformer principal post both sides, the quadrangle extension board is to the inboard slope of core post lamination central line unshakable in one's determination, the border position of quadrangle extension board has welded the round steel and forms the quadrilateral groove, sets up magnetic shield plate in the quadrilateral groove, magnetic shield plate form by the novel silicon steel sheet pile-up of appropriate quantity, novel silicon steel sheet is tailor to the rhombus, magnetic shield plate passes through insulating screw and nut fixed mounting in the quadrilateral groove of quadrangle extension board, set up novel insulating paper board between magnetic shield plate and the quadrangle extension board and between magnetic shield plate and the round steel, the grounding piece presss from both sides in novel silicon steel sheet, the grounding piece is connected with transformer folder web after drawing forth through ground nut. The utility model discloses it is closed through metalwork such as folder and oil tank effectively to have reduced the magnetic leakage flux, avoids the local overheat of folder, oil tank.

Description

Novel magnetic shielding structure of transformer body

Technical Field

The utility model relates to a transformer manufacturing technology field, specific novel magnetic shielding structure of transformer ware body that says so.

Background

At present, the magnetic shielding used for three-phase five-column 220KV transformer products in power equipment adopts plate type magnetic shielding used on a transformer clamping piece and magnetic shielding used on an oil tank, the principle of the magnetic shielding is that a magnetic shunt with lower magnetic resistance is formed by utilizing the high magnetic conductivity of an electrical steel strip, so that the magnetic leakage flux of the transformer is mostly closed no longer through metal pieces such as the clamping piece and the oil tank, the principle of leading is based on, the loss can be reduced, the local overheating of the clamping piece and the oil tank is avoided, and the magnetic leakage flux of the transformer cannot be well reduced.

The other magnetic shielding of the 500KV transformer body is lung blade type magnetic shielding which can effectively reduce magnetic leakage flux, but the lung blade magnetic shielding needs the matching of iron yoke cushion blocks, and the structure is large, the process is complex, the cost is high, and the transformer body is not suitable for being used by a 220KV transformer.

Disclosure of Invention

In order to solve the technical problem, the utility model provides a novel magnetism shielding structure of transformer ware body.

The utility model discloses the technical scheme who adopts as follows:

a novel magnetic shielding structure of a transformer body is applied to a three-phase five-column 220KV transformer and comprises: the novel silicon steel plate cutting device comprises quadrilateral support plates, wherein the quadrilateral support plates are symmetrically arranged on clamping piece webs on two sides of a main column of the transformer, the quadrilateral support plates incline towards the inner sides of a core column lamination central line, round steel is welded at the edge positions of the quadrilateral support plates to form four-side grooves, magnetic shielding plates are arranged in the four-side grooves and are formed by stacking novel silicon steel plates in proper quantity, the novel silicon steel plates are cut into an oblique quadrilateral, the magnetic shielding plates are fixedly arranged in the four-side grooves of the quadrilateral support plates through insulating screws and nuts, novel insulating paper plates are arranged between the magnetic shielding plates and the quadrilateral support plates and between the magnetic shielding plates and the round steel, the grounding piece is clamped in the novel silicon steel plates, and the grounding piece is connected with the clamping piece webs of the transformer after being led out through a grounding nut.

Preferably, the magnetic shield panels are coated with an insulating varnish.

Preferably, the quadrilateral supporting plate is welded and installed on the clamping piece webs on two sides of the main column of the transformer, and through holes for fixing the novel silicon steel plate are formed in the surface of the quadrilateral supporting plate in a matched mode.

Preferably, the novel insulating paper board is bound with a white cloth belt.

The utility model has the advantages that:

1. the magnetic shielding coverage area can be increased, the magnetic leakage flux is effectively reduced and is closed through metal pieces such as clamping pieces, oil tanks and the like, the loss increased due to the magnetic leakage flux is further reduced, the local overheating of the clamping pieces and the oil tanks is avoided, and therefore the overall performance level of three-phase five-column transformer products is improved.

2. To the principle of lung lobe magnetism shielding structure and complexity, with high costs on the production technology not enough, the utility model discloses compare with lung lobe magnetism shielding, also reduced the complexity of design, technology and production when the guarantee product performance, reduce cost.

3. The lap joint area of the magnetic shielding and the core column lamination is increased, so that the magnetic shielding is more reliable, and the effect is more obvious.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are illustrative of some embodiments of the invention, and that those skilled in the art will be able to derive other drawings without inventive step from these drawings, which are within the scope of the present application.

FIG. 1 is a schematic view of an old fashioned magnetic shield structure;

FIG. 2 is a schematic view of a conventional silicon steel sheet and a conventional insulating paperboard;

fig. 3 is a front view of the novel magnetic shielding structure according to the embodiment of the present invention;

fig. 4 is a side view of the novel magnetic shielding structure according to the embodiment of the present invention;

fig. 5 is a schematic view of a novel silicon steel plate and a novel insulating paperboard according to an embodiment of the present invention;

in the figure, 1 is the core-column lamination of iron core, 2 is transformer coil external diameter, 3 is old-fashioned magnetic shield structure, 4 is old-fashioned silicon steel sheet, 5 is old-fashioned insulating paper board, 6 is the quadrangle extension board, 7 is novel silicon steel sheet, 8 is novel insulating paper board, 9 is insulating screw rod and nut, 10 is the round steel, 11 is ground nut.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention.

As shown in fig. 1, which is a schematic view of an old-fashioned magnetic shield structure; as shown in fig. 2, a schematic diagram of a legacy silicon steel sheet and a legacy insulating paperboard is shown. The old magnetic shielding structure 3 is arranged between the outer diameter 2 of the transformer coil and the iron core column lamination 1, the old magnetic shielding structure 3 is composed of an old silicon steel plate 4 and an old insulating paper plate 5, 2-a in figure 2 is the old silicon steel plate 4,2-b is the old insulating paper plate 5, and the dotted line is the bending line of the old insulating paper plate 5. Because old-fashioned magnetism shielding structure 3 does not have inclination, leads to the area of magnetic screen less, has more magnetic leakage flux and leads to transformer folder and oil tank to appear local overheated problem in the leading-in iron core.

As shown in fig. 3, it is a front view of the novel magnetic shielding structure according to the embodiment of the present invention; as shown in fig. 4, it is a side view of the novel magnetic shielding structure according to the embodiment of the present invention; as shown in fig. 5, it is a schematic diagram of the novel silicon steel plate and the novel insulating paperboard according to the embodiment of the present invention. A novel magnetic shielding structure of a transformer body is applied to a three-phase five-column 220KV transformer and comprises: quadrilateral extension board 6 of suitable size, quadrilateral extension board 6 symmetric form install on the folder web of transformer principal post both sides, certain angle of quadrilateral extension board 6 to the inboard slope of core post lamination central line, quadrilateral extension board 6 border position has welded round steel 10 and forms the quadrilateral groove (magnetic screen groove promptly), sets up the magnetic shield board in the quadrilateral groove, the magnetic shield board form by the novel silicon steel sheet 7 stack of appropriate quantity, novel silicon steel sheet 7 is tailor to the trapezium, the magnetic shield board passes through insulating screw and nut 9 fixed mounting in the quadrilateral groove of quadrilateral extension board 6, set up novel insulated paper board 8 between magnetic shield board and the quadrilateral extension board 6 and between magnetic shield board and the round steel 10 (the surface that magnetic shield board and quadrilateral extension board 6 meet and the novel insulated paper board 8 of magnetic shield board parcel all around), the earthing lug presss from both sides in novel silicon steel sheet 7, the earthing lug is connected with transformer folder web after leading out through earthing nut 11, reliably grounds with web folder in the lump.

As a preferred embodiment, the magnetic shield panels are coated with an insulating varnish. Quadrilateral extension board 6 welding is installed on the folder web of transformer king-post both sides, and the surface cooperation of quadrilateral extension board 6 is seted up and is used for fixing the through-hole of novel silicon steel sheet 7.

In a three-phase five-column 220KV transformer, a magnetic shielding structure is placed in the range of the outer diameter of a transformer coil, so that the covered area after the magnetic shielding structure is placed is limited. The utility model discloses a change the shape and the installation angle back of magnetic screen structure, the magnetic screen coverage area of the novel magnetic screen structure of placing obviously increases. The novel insulating paper board 8 is bound with the white cloth tape, and the assembly of the novel magnetic shielding structure is firmer and more reliable by binding the white cloth tape.

The utility model discloses novel magnetic screen structure compares with old-fashioned magnetic screen structure, and the comparison of figure 1 and figure 3, figure 2 and figure 5, obviously in same project, the coil structure is the same, the utility model discloses a novel magnetic screen structure can be better utilize the space, produces the magnetic screen of bigger area. More leakage magnetic fluxes can be guided into the iron core through the magnetic shielding plate with a larger area, the leakage magnetic fluxes are effectively reduced to pass through the closing of metal pieces such as clamping pieces, an oil tank and the like, the loss increased by the leakage magnetic fluxes is further reduced, and the local overheating of the clamping pieces and the oil tank is avoided.

Finally, it should be noted that: the above embodiments are only specific embodiments of the present invention, and are not intended to limit the technical solutions of the present invention, and the scope of the present invention is not limited thereto. Those skilled in the art will understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.

Claims

1. The utility model provides a novel magnetic shield structure of transformer ware body, is applied to three-phase five-column 220KV transformer which characterized in that includes: quadrilateral supporting plate (6), quadrilateral supporting plate (6) symmetric form install on the folder web of transformer king-post both sides, quadrilateral supporting plate (6) are to the inboard slope of core post lamination central line, the border position of quadrilateral supporting plate (6) has welded round steel (10) and forms the four-sided groove, sets up the magnetic shield board in the four-sided groove, the magnetic shield board form by the novel silicon steel sheet (7) stack of appropriate quantity, novel silicon steel sheet (7) are tailor to the trapezium, the magnetic shield board passes through insulating screw and nut (9) fixed mounting in the four-sided groove of quadrilateral supporting plate (6), set up novel insulating paper board (8) between magnetic shield board and quadrilateral supporting plate (6) and between magnetic shield board and round steel (10), the ground connection piece presss from both sides in novel silicon steel sheet (7), the ground connection piece is connected with the transformer web after drawing forth through ground connection nut (11).

2. The novel magnetic shielding structure of the transformer body according to claim 1, wherein the magnetic shielding plate is coated with insulating varnish.

3. The novel magnetic shielding structure of the transformer body according to claim 1, wherein the quadrilateral supporting plates (6) are welded and installed on clamping piece webs on two sides of the main column of the transformer, and through holes for fixing the novel silicon steel plates (7) are formed in the surfaces of the quadrilateral supporting plates (6) in a matched mode.

4. The novel magnetic shielding structure of the transformer body according to claim 1, wherein a white cloth tape is bound on the novel insulating paper board (8).