CN110085403B - Magnetic shielding structure and magnetic shielding method for end part of three-post iron core of transformer - Google Patents
Magnetic shielding structure and magnetic shielding method for end part of three-post iron core of transformer Download PDFInfo
- Publication number
- CN110085403B CN110085403B CN201910423850.5A CN201910423850A CN110085403B CN 110085403 B CN110085403 B CN 110085403B CN 201910423850 A CN201910423850 A CN 201910423850A CN 110085403 B CN110085403 B CN 110085403B
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- magnetic shielding
- end magnetic
- iron core
- clamping piece
- core side
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 7
- 230000000149 penetrating effect Effects 0.000 claims abstract description 13
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 13
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 230000001680 brushing effect Effects 0.000 claims description 5
- 238000009413 insulation Methods 0.000 claims description 5
- 239000011347 resin Substances 0.000 claims description 5
- 229920005989 resin Polymers 0.000 claims description 5
- 230000002349 favourable effect Effects 0.000 claims 1
- 230000005389 magnetism Effects 0.000 claims 1
- 230000004907 flux Effects 0.000 abstract description 10
- 238000013021 overheating Methods 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 6
- 238000004804 winding Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/346—Preventing or reducing leakage fields
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/36—Electric or magnetic shields or screens
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Regulation Of General Use Transformers (AREA)
Abstract
The invention relates to a magnetic shielding structure and a magnetic shielding method for the end part of a three-post iron core of a transformer, and belongs to the technical field of transformer manufacturing. The technical proposal is as follows: the end magnetic shielding (3) is arranged on the outer side of the iron core side column (1), an insulating plate (4) is arranged between the end magnetic shielding (3) and the iron core side column (1), the end magnetic shielding (3) is fixed between the upper clamping piece (2 a) and the lower clamping piece (2 b) through a fastening screw (6), clamping piece insulating pieces (5) and clamping insulating plates (7) are arranged between the end magnetic shielding (3) and the upper clamping piece (2 a) and between the end magnetic shielding (3) and the lower clamping piece (2 b), and the core penetrating screw (6) is mutually insulated with the upper clamping piece (2 a) and the lower clamping piece (2 b). The beneficial effects of the invention are as follows: the transformer can play a role in shielding and guiding magnetic flux, and reduces the magnetic flux leakage entering the transformer oil tank and the iron core structural member, thereby avoiding local overheating of the transformer.
Description
Technical Field
The invention relates to a magnetic shielding structure and a magnetic shielding method for the end part of a three-post iron core of a transformer, and belongs to the technical field of transformer manufacturing.
Background
The transformer product with larger total leakage flux, the iron core structural member and the oil tank are greatly influenced by the leakage flux, and the problem of local overheating is extremely easy to occur. For a three-column iron core, the winding end parts of two side columns are few in area part covered by the iron core, most of magnetic leakage at the end parts can enter structural parts such as an oil tank, the iron core, clamping pieces and the like to generate larger loss, and the risk of local overheating exists, so that the problem of magnetic leakage of the side columns is a key for controlling the loss of the three-column transformer.
Disclosure of Invention
The invention aims to provide a magnetic shielding structure and a magnetic shielding method for the end parts of three-post iron cores of a transformer, which are used for guiding magnetic leakage of the end parts of side post windings of the iron cores into a main magnetic circuit of the iron cores, reducing magnetic density in a transformer oil tank and an iron core structural member and solving the problems in the prior art.
The technical scheme of the invention is as follows:
The utility model provides a three post iron core tip magnetic shielding structures of transformer, contain the iron core border, go up the folder, lower folder, the tip magnetic screen, the insulation board, the folder insulating part, fastening screw and clamp insulation board, the outside at the iron core border is established to the tip magnetic screen, be equipped with the insulation board between tip magnetic screen and the iron core border, the tip magnetic screen passes through fastening screw to be fixed between last folder and lower folder, all be equipped with folder insulating part and clamp insulation board between tip magnetic screen and the last folder and between tip magnetic screen and the lower folder, cross between core screw and last folder and the lower folder mutually insulated.
The end magnetic shielding is divided into an upper part and a lower part, and the two end magnetic shielding parts are respectively positioned at the same height with the upper yoke and the lower yoke of the iron core side column.
The end magnetic shielding is formed by stacking silicon steel sheets, the stacking direction of the silicon steel sheets is the same as that of the iron core side column, and the silicon steel sheets are mutually bonded into a rigid whole by brushing resin.
The magnetic shielding method for the end part of the three-post iron core of the transformer comprises iron core side posts, upper clamping pieces, lower clamping pieces, end magnetic shielding, an insulating plate, clamping piece insulating pieces, a fastening screw rod and a clamping insulating plate, wherein the end magnetic shielding is formed by stacking silicon steel sheets with different lengths and widths, and the silicon steel sheets are bonded into a whole by brushing resin; the two sides of the end magnetic shielding are provided with clamping insulating plates, and the thickness direction of the end magnetic shielding is fastened into a whole by a core penetrating screw rod; the end magnetic shields are positioned at the outer side of the iron core side column, one upper magnetic shield and one lower magnetic shield are respectively positioned at the same height with the upper yoke and the lower yoke of the iron core side column; the end magnetic shielding is fixed between the upper clamping piece and the lower clamping piece by using the core penetrating screw, clamping piece insulating pieces are arranged between the end magnetic shielding and the upper clamping piece as well as between the end magnetic shielding and the lower clamping piece, the core penetrating screw, the upper clamping piece and the lower clamping piece are mutually insulated, and the end magnetic shielding can be grounded independently at one point; the end magnetic shielding and the corner of the iron core side column are staggered, an insulating plate is arranged between the end magnetic shielding and the iron core side column, the end magnetic shielding is separated from the iron core side column by the insulating plate, and the end magnetic shielding is prevented from being overlapped with the iron core side column; the magnetic shielding at the end part plays a role in shielding and guiding magnetic flux, so that the magnetic flux leakage is reduced and enters the transformer oil tank and the iron core structural member, and the local overheating of the transformer is avoided.
The beneficial effects of the invention are as follows: the transformer can play a role in shielding and guiding magnetic flux, and reduces the magnetic flux leakage entering the transformer oil tank and the iron core structural member, thereby avoiding local overheating of the transformer.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
in the figure: iron core side column 1, upper clamp 2a, lower clamp 2b, end magnetic shielding 3, insulating plate 4, clamp insulating piece 5, core penetrating screw 6 and clamping insulating plate 7.
Detailed Description
The invention is further illustrated by way of example with reference to the accompanying drawings.
Referring to fig. 1, a magnetic shielding structure at the end part of a three-pole iron core of a transformer comprises an iron core side pole 1, an upper clamping piece 2a, a lower clamping piece 2b, an end magnetic shielding 3, an insulating plate 4, a clamping piece insulating piece 5, a fastening screw 6 and a clamping insulating plate 7, wherein the end magnetic shielding 3 is arranged at the outer side of the iron core side pole 1, the insulating plate 4 is arranged between the end magnetic shielding 3 and the iron core side pole 1, the end magnetic shielding 3 is fixed between the upper clamping piece 2a and the lower clamping piece 2b through the fastening screw 6, the clamping piece insulating piece 5 and the clamping insulating plate 7 are respectively arranged between the end magnetic shielding 3 and the upper clamping piece 2a and between the end magnetic shielding 3 and the lower clamping piece 2b, and the core penetrating screw 6 is mutually insulated between the upper clamping piece 2a and the lower clamping piece 2 b.
In this embodiment, referring to fig. 1, the end magnetic shield 3 is formed by stacking silicon steel sheets with different lengths and widths, and the silicon steel sheets are bonded into a whole by brushing resin between the silicon steel sheets; the two sides of the end magnetic shielding 3 are provided with clamping insulating plates 7, and the end magnetic shielding 3 is fastened into a whole by a core penetrating screw rod 6 in the thickness direction;
The end magnetic shields 3 are positioned at the outer side of the iron core side column 1, one upper part and one lower part are respectively positioned, and the two end magnetic shields 3 are respectively positioned at the same height with the upper yoke and the lower yoke of the iron core side column 1;
The end magnetic shielding 3 is fixed between the upper clamping piece 2a and the lower clamping piece 2b by a core penetrating screw 6, clamping piece insulating pieces 5 are respectively arranged between the end magnetic shielding 3 and the upper clamping piece 2a and the lower clamping piece 2b, the core penetrating screw 6 is mutually insulated from the upper clamping piece 2a and the lower clamping piece 2b, and the end magnetic shielding 3 can be grounded at an independent point;
The end magnetic shielding 3 is staggered with the corners of the iron core side column 1 level iron, the gap requirement is as small as possible, and the magnetic leakage sucked by the end magnetic shielding 3 is beneficial to being led into the iron core side column 1 as much as possible;
an insulating plate 4 is arranged between the end magnetic shielding 3 and the iron core side column 1, the insulating plate 4 separates the end magnetic shielding 3 from the iron level of the iron core side column 1, and the magnetic flux is prevented from forming circulation between the end magnetic shielding 3 and the iron yoke due to the mutual lap joint of the end magnetic shielding 3 and the iron level of the iron core side column 1;
The end magnetic shielding 3 is matched with the magnetic shielding on the clamping piece of the transformer product, so that the effects of shielding and guiding magnetic flux are achieved, and the magnetic leakage is reduced and enters the transformer oil tank and the iron core structural member, so that the local overheating of the transformer is avoided.
Claims (2)
1. A three post iron core tip magnetism shielding structure of transformer, its characterized in that: the magnetic shielding device comprises an iron core side column (1), an upper clamping piece (2 a), a lower clamping piece (2 b), an end magnetic shielding piece (3), an insulating plate (4), a clamping piece insulating piece (5), a fastening screw (6) and a clamping insulating plate (7), wherein the end magnetic shielding piece (3) is arranged on the outer side of the iron core side column (1), one side of the end magnetic shielding piece (3) positioned on the iron core side column (1) is of an arc-shaped structure, the shape of the end magnetic shielding piece is matched with a circumcircle of the iron core side column (1), a gap is formed between the end magnetic shielding piece and the iron core side column, and the end magnetic shielding piece is favorable for the magnetic leakage of the end magnetic shielding piece (3) to be inhaled to be led into the iron core side column (1); an insulating plate (4) is arranged between the end magnetic shielding (3) and the iron core side column (1), the end magnetic shielding (3) is fixed between the upper clamping piece (2 a) and the lower clamping piece (2 b) through a fastening screw (6), clamping insulating pieces (5) and clamping insulating plates (7) are arranged between the end magnetic shielding (3) and the upper clamping piece (2 a) and between the end magnetic shielding (3) and the lower clamping piece (2 b), and mutual insulation between the core penetrating screw (6) and the upper clamping piece (2 a) and the lower clamping piece (2 b) is ensured, so that the end magnetic shielding (3) can be grounded at an independent point; the end magnetic shielding (3) is divided into an upper part and a lower part, and the two end magnetic shielding (3) are respectively positioned at the same height with the upper yoke and the lower yoke of the iron core side column (1); the end magnetic shielding (3) is formed by stacking silicon steel sheets, the stacking direction of the silicon steel sheets is the same as that of the iron core side column (1), and the silicon steel sheets are mutually bonded into a rigid whole by brushing resin.
2. A magnetic shielding method for the end part of a three-post iron core of a transformer is characterized by comprising the following steps: the iron core side column comprises an iron core side column (1), an upper clamping piece (2 a), a lower clamping piece (2 b), an end magnetic shielding piece (3), an insulating plate (4), a clamping piece insulating piece (5), a fastening screw (6) and a clamping insulating plate (7), wherein the end magnetic shielding piece (3) is formed by stacking silicon steel sheets with different lengths and widths, and the silicon steel sheets are adhered into a whole by brushing resin; clamping insulating plates (7) are arranged on two sides of the end magnetic shielding (3), and the end magnetic shielding (3) is fastened into a whole by a core penetrating screw rod (6) in the thickness direction; the end magnetic shields (3) are positioned at the outer sides of the iron core side posts (1), one end magnetic shield (3) is positioned at the same height as the upper yoke and the lower yoke of the iron core side posts (1), and the other end magnetic shields (3) are positioned at the same height as the upper yoke and the lower yoke of the iron core side posts (1); the end magnetic shielding (3) is fixed between the upper clamping piece (2 a) and the lower clamping piece (2 b) by using a core penetrating screw (6), clamping piece insulating pieces (5) are arranged between the end magnetic shielding (3) and the upper clamping piece (2 a) and between the end magnetic shielding (3) and the lower clamping piece (2 b), the core penetrating screw (6) is mutually insulated from the upper clamping piece (2 a) and the lower clamping piece (2 b), and the end magnetic shielding (3) can be grounded at an independent point; the end magnetic shielding (3) is staggered with the corners of the iron core side column (1), one side of the end magnetic shielding (3) positioned on the iron core side column (1) is of an arc structure, the shape of the end magnetic shielding is matched with the circumcircle of the iron core side column (1), a gap is formed between the end magnetic shielding (3) and the circumcircle, and magnetic leakage absorbed by the end magnetic shielding (3) is led into the iron core side column (1); an insulating plate (4) is arranged between the end magnetic shielding (3) and the iron core side column (1), the insulating plate (4) separates the end magnetic shielding (3) from the grade iron of the iron core side column (1), and the end magnetic shielding (3) is prevented from being overlapped with the grade iron of the iron core side column (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910423850.5A CN110085403B (en) | 2019-05-21 | 2019-05-21 | Magnetic shielding structure and magnetic shielding method for end part of three-post iron core of transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910423850.5A CN110085403B (en) | 2019-05-21 | 2019-05-21 | Magnetic shielding structure and magnetic shielding method for end part of three-post iron core of transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110085403A CN110085403A (en) | 2019-08-02 |
| CN110085403B true CN110085403B (en) | 2024-04-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910423850.5A Active CN110085403B (en) | 2019-05-21 | 2019-05-21 | Magnetic shielding structure and magnetic shielding method for end part of three-post iron core of transformer |
Country Status (1)
| Country | Link |
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| CN (1) | CN110085403B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111029114A (en) * | 2019-12-30 | 2020-04-17 | 山东泰开变压器有限公司 | Magnetic shielding device of large-capacity transformer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4485368A (en) * | 1981-11-30 | 1984-11-27 | Alsthom-Atlantique | Electrical shunt reactor coil |
| CN201829323U (en) * | 2010-06-12 | 2011-05-11 | 特变电工沈阳变压器集团有限公司 | Clamping piece magnetic shielding structure in transformer |
| CN202102845U (en) * | 2011-05-19 | 2012-01-04 | 卧龙电气烟台东源变压器有限公司 | Casting screw type magnetic shielding structure |
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| CN202940112U (en) * | 2012-01-12 | 2013-05-15 | 洛阳恒光特种变压器有限公司 | Strip-shaped magnetic shielding structure |
| CN103426616A (en) * | 2012-05-14 | 2013-12-04 | 特变电工股份有限公司 | Magnetic shielding structure and single-phase transformer |
| JP2014216524A (en) * | 2013-04-26 | 2014-11-17 | 株式会社日立製作所 | Stationary induction apparatus |
| CN204088033U (en) * | 2014-09-26 | 2015-01-07 | 山东电力设备有限公司 | A kind of super, paralleling reactor of extra-high voltage magnetic screen |
| CN204390888U (en) * | 2015-03-12 | 2015-06-10 | 山东电力设备有限公司 | A kind of New Magnetic Field Controlled shielding radiator structure |
| CN106373762A (en) * | 2016-10-26 | 2017-02-01 | 山东电力设备有限公司 | Transformer capable of controlling magnetic flux leakage |
| CN206282708U (en) * | 2016-08-31 | 2017-06-27 | 卧龙电气集团股份有限公司 | A kind of magnet shielding structure for being applied to super-pressure auto-transformer folder |
| CN207097640U (en) * | 2017-06-22 | 2018-03-13 | 山东泰开变压器有限公司 | Folder magnetic shielding device for transformer core |
-
2019
- 2019-05-21 CN CN201910423850.5A patent/CN110085403B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4485368A (en) * | 1981-11-30 | 1984-11-27 | Alsthom-Atlantique | Electrical shunt reactor coil |
| CN201829323U (en) * | 2010-06-12 | 2011-05-11 | 特变电工沈阳变压器集团有限公司 | Clamping piece magnetic shielding structure in transformer |
| CN202102845U (en) * | 2011-05-19 | 2012-01-04 | 卧龙电气烟台东源变压器有限公司 | Casting screw type magnetic shielding structure |
| CN202159564U (en) * | 2011-06-21 | 2012-03-07 | 青岛海沃电气设备有限公司 | Controllable noise reduction device for reactors |
| CN202940112U (en) * | 2012-01-12 | 2013-05-15 | 洛阳恒光特种变压器有限公司 | Strip-shaped magnetic shielding structure |
| CN103426616A (en) * | 2012-05-14 | 2013-12-04 | 特变电工股份有限公司 | Magnetic shielding structure and single-phase transformer |
| JP2014216524A (en) * | 2013-04-26 | 2014-11-17 | 株式会社日立製作所 | Stationary induction apparatus |
| CN204088033U (en) * | 2014-09-26 | 2015-01-07 | 山东电力设备有限公司 | A kind of super, paralleling reactor of extra-high voltage magnetic screen |
| CN204390888U (en) * | 2015-03-12 | 2015-06-10 | 山东电力设备有限公司 | A kind of New Magnetic Field Controlled shielding radiator structure |
| CN206282708U (en) * | 2016-08-31 | 2017-06-27 | 卧龙电气集团股份有限公司 | A kind of magnet shielding structure for being applied to super-pressure auto-transformer folder |
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| CN207097640U (en) * | 2017-06-22 | 2018-03-13 | 山东泰开变压器有限公司 | Folder magnetic shielding device for transformer core |
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| Publication number | Publication date |
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| CN110085403A (en) | 2019-08-02 |
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