CN103730238B - A kind of transformer oil tank magnetic shield with the alert function of magnetic - Google Patents
A kind of transformer oil tank magnetic shield with the alert function of magnetic Download PDFInfo
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- CN103730238B CN103730238B CN201310725325.1A CN201310725325A CN103730238B CN 103730238 B CN103730238 B CN 103730238B CN 201310725325 A CN201310725325 A CN 201310725325A CN 103730238 B CN103730238 B CN 103730238B
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Abstract
The present invention relates to a kind of transformer oil tank magnetic shield with the alert function of magnetic, belong to technical field of transformer manufacturing.Technical scheme is: silicon steel sheet is cut into strip, and then blocks of sticky folded, place some copper bars (2) in the middle of sticky folded silicon steel sheet (1), make magnetic shield panel together, the area of magnetic shield panel and fuel tank (3) need the area shielded to match; By fastener, magnetic shield panel and fuel tank are fixed into an entirety, whole magnetic shield panel is along transformer body center line symmetry and along fuel tank long axis direction layout, in magnetic shield panel, the crystalline substance of silicon steel sheet rolls the short transverse that direction is fuel tank.The present invention fundamentally solves background technology fuel tank magnet shielding structure due to problems such as loss that is that cause is large each position magnetic flux distribution of magnetic screen is uneven, noise large, fuel tank local overheatings; Improve the utilance of material, and its electrode shape is also improved significantly, improve electric insulation nargin.
Description
Technical field
The present invention relates to a kind of transformer oil tank magnetic shield with the alert function of magnetic, belong to technical field of transformer manufacturing.
Background technology
In large-scale power transformer, because transformer capacity is larger, impedance is also larger, stray transformer flux is caused to lead to total amount very large, in order to reduce stray loss of transformer, and the fuel tank local overheating preventing from passing through fuel tank due to a large amount of leakage flux and cause, the magnetic screen of bar shaped fuel tank is often set on oil tank of transformer, material is the silicon steel sheet of high magnetic conduction, the magnet shielding structure of background technology is as follows: wide strip silicon steel sheet being cut into specified width, which width, and then blocks of gluing is stacked to appointed thickness, magnetic shield panel of the same size.Magnetic shield panel is about device body center line symmetry and along fuel tank long axis direction layout, in magnetic shield panel, the crystalline substance of silicon steel sheet rolls the short transverse that direction is fuel tank.On the thickness direction of this kind of structure magnetic screen, magnetic flux distribution is very uneven, and the magnetic near the silicon steel sheet of side, Qi Shen center is close higher, and the magnetic of tank wall side is close lower, differs more than two times; And along fuel tank long axis direction, the magnetic shield panel of device body center is same uneven with the close distribution of magnetic in the magnetic shield panel of two side positions, device body center magnetic is close maximum, and it is lower the closer to both sides, and face main leakage direction due to the magnetic screen lath face of rolling, make the loop path of eddy current elongated, eddy current loss becomes large; In the shielding of this type of fuel tank, stray transformer flux leads to transverse crossing phenomenon between barricade sticky folded thickness direction upper slice, and also comparatively seriously, it is the maximum reason causing abnormal eddy current loss that this type of leakage field passes through, so abnormal eddy current loss increases greatly.Again because after arranging magnetic screen, need welding bent plate with fixing magnetic shield panel in fuel tank, cause the interior facade of fuel tank to become height and rise and fall, electrode shape is very not good, and insulation margin diminishes, and needs to take other measure to improve.So the fuel tank shielding construction of class formation not only causes the utilance of material low, and make fuel tank shadow loss increase (magnetic hysteresis loss, classical eddy current loss, abnormal eddy current loss all has increase), noise also becomes large thereupon, easy generation fuel tank local overheating problem, and reduce the insulation margin of transformer.Therefore, improving traditional fuel tank shielding construction is engineers and technicians' problem demanding prompt solutions.
Summary of the invention
The object of the invention is to provide a kind of transformer oil tank magnetic shield with the alert function of magnetic, improves the utilance of material; And its electrode shape is also improved significantly, improves electric insulation nargin, solve Problems existing in background technology.
Technical scheme of the present invention is:
A kind of transformer oil tank magnetic shield with the alert function of magnetic, silicon steel sheet is cut into strip, then blocks of sticky folded, place some copper bars in the middle of sticky folded silicon steel sheet, make magnetic shield panel together, the area of magnetic shield panel and fuel tank need the area shielded to match; By fastener, magnetic shield panel and fuel tank are fixed into an entirety, whole magnetic shield panel is along transformer body center line symmetry and along fuel tank long axis direction layout, in magnetic shield panel, the crystalline substance of silicon steel sheet rolls the short transverse that direction is fuel tank.Because in magnetic shield panel, the thickness direction of silicon steel sheet faces main leakage, make the loop path of eddy current become very short, substantially reduce the generation of eddy current; And the reduction due to eddy current makes magnetic flux be uniformly distributed at fuel tank short-axis direction.
Some copper bars are placed in the middle of described sticky folded silicon steel sheet, magnetic shield panel is divided into several regions by some copper bars, the diamagnetic performance of copper bar is utilized to carry out subregion to magnetic screen, the magnetic resistance in each region is controlled according to the area difference of each sectional magnetic barricade, make the magnetic resistance in each region identical, make leakage flux realize being uniformly distributed on the magnetic shield panel of transformer body center and both sides, realize the alert function of magnetic.
In order to improve the electrode shape after increasing fuel tank magnetic screen, magnetic shield panel is arranged continuously on fuel tank, become a plane, in order to realize the alert function of magnetic, namely as police command, make leakage field take their own roads, be distributed in each position of fuel tank shielding uniformly, between the sheet and sheet of the local silicon steel disc of fuel tank magnetic shield panel, increase copper bar, utilize the diamagnetic effect of copper bar to reduce the transverse crossing situation of leakage flux.
The invention has the beneficial effects as follows: the present invention fundamentally solve background technology fuel tank magnet shielding structure due to each position magnetic flux distribution of magnetic screen uneven and cause the problem such as large, the fuel tank local overheating of large, the noise of loss; Improve the utilance of material, and its electrode shape is also improved significantly, improve electric insulation nargin.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is schematic top plan view of the present invention;
In figure: silicon steel sheet 1, copper bar 2, fuel tank 3.
Embodiment
Below in conjunction with accompanying drawing, by example, the invention will be further described.
A kind of transformer oil tank magnetic shield with the alert function of magnetic, silicon steel sheet is cut into strip, then blocks of sticky folded, place some copper bars 2 in the middle of sticky folded silicon steel sheet 1, make magnetic shield panel together, area and the fuel tank 3 of magnetic shield panel need the area shielded to match; By fastener, magnetic shield panel and fuel tank are fixed into an entirety, whole magnetic shield panel is along transformer body center line symmetry and along fuel tank long axis direction layout, in magnetic shield panel, the crystalline substance of silicon steel sheet rolls the short transverse that direction is fuel tank.Because in magnetic shield panel, the thickness direction of silicon steel sheet faces main leakage, make the loop path of eddy current become very short, substantially reduce the generation of eddy current; And the reduction due to eddy current makes magnetic flux be uniformly distributed at fuel tank short-axis direction.
Some copper bars are placed in the middle of described sticky folded silicon steel sheet, magnetic shield panel is divided into several regions by some copper bars, the diamagnetic performance of copper bar is utilized to carry out subregion to magnetic screen, the magnetic resistance in each region is controlled according to the area difference of each sectional magnetic barricade, make the magnetic resistance in each region identical, make leakage flux realize being uniformly distributed on the magnetic shield panel of transformer body center and both sides, realize the alert function of magnetic.
Claims (1)
1. the transformer oil tank magnetic shield with the alert function of magnetic, it is characterized in that: silicon steel sheet is cut into strip, then blocks of sticky folded, some copper bars (2) are placed in the middle of sticky folded silicon steel sheet (1), make magnetic shield panel together, the area of magnetic shield panel and fuel tank (3) need the area shielded to match; By fastener, magnetic shield panel and fuel tank are fixed into an entirety, whole magnetic shield panel is along transformer body center line symmetry and along fuel tank long axis direction layout, in magnetic shield panel, the crystalline substance of silicon steel sheet rolls the short transverse that direction is fuel tank; Some copper bars are placed in the middle of described sticky folded silicon steel sheet, magnetic shield panel is divided into several regions by some copper bars, the diamagnetic performance of copper bar is utilized to carry out subregion to magnetic screen, the magnetic resistance in each region is controlled according to the area difference of each sectional magnetic barricade, make the magnetic resistance in each region identical, make leakage flux realize being uniformly distributed on the magnetic shield panel of transformer body center and both sides, realize the alert function of magnetic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310725325.1A CN103730238B (en) | 2013-12-25 | 2013-12-25 | A kind of transformer oil tank magnetic shield with the alert function of magnetic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310725325.1A CN103730238B (en) | 2013-12-25 | 2013-12-25 | A kind of transformer oil tank magnetic shield with the alert function of magnetic |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103730238A CN103730238A (en) | 2014-04-16 |
| CN103730238B true CN103730238B (en) | 2016-01-20 |
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| CN201310725325.1A Active CN103730238B (en) | 2013-12-25 | 2013-12-25 | A kind of transformer oil tank magnetic shield with the alert function of magnetic |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105118611A (en) * | 2015-07-13 | 2015-12-02 | 国家电网公司 | Method for reducing partial heating of transformer shell |
| CN106583887B (en) * | 2016-12-15 | 2018-12-04 | 保定天威电气设备结构有限公司 | Crack resistence method is welded in magnetic screen in a kind of power transformer tank |
| CN109599256A (en) * | 2019-01-18 | 2019-04-09 | 吴江变压器有限公司 | A kind of low magnetic resistance folder magnetic screen |
| CN110556959B (en) * | 2019-09-29 | 2021-09-10 | 长江勘测规划设计研究有限责任公司 | Electromagnetic shielding structure of giant water turbine generator in strong electromagnetic environment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2146772Y (en) * | 1992-12-25 | 1993-11-17 | 沈阳变压器厂 | Omnibearing magnetic screen reactor |
| CN203225167U (en) * | 2013-04-05 | 2013-10-02 | 国家电网公司 | Magnetic shield for transformers |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3646595B2 (en) * | 1999-12-03 | 2005-05-11 | 株式会社日立製作所 | Static induction machine |
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2013
- 2013-12-25 CN CN201310725325.1A patent/CN103730238B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2146772Y (en) * | 1992-12-25 | 1993-11-17 | 沈阳变压器厂 | Omnibearing magnetic screen reactor |
| CN203225167U (en) * | 2013-04-05 | 2013-10-02 | 国家电网公司 | Magnetic shield for transformers |
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| CN103730238A (en) | 2014-04-16 |
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