CN103730238A - Transformer oil tank magnetic shield with magnetic warning function - Google Patents
Transformer oil tank magnetic shield with magnetic warning function Download PDFInfo
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- CN103730238A CN103730238A CN201310725325.1A CN201310725325A CN103730238A CN 103730238 A CN103730238 A CN 103730238A CN 201310725325 A CN201310725325 A CN 201310725325A CN 103730238 A CN103730238 A CN 103730238A
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Abstract
The invention relates to a transformer oil tank magnetic shield with a magnetic warning function and belongs to the technical field of transformer manufacturing. According to the technical scheme, the transformer oil tank magnetic shield is characterized in that silicon steel sheets are cut into elongated shapes and then adhered and stacked one by one, a plurality of copper rods (2) are disposed in the middle of the silicon steel sheets (1) adhered and stacked to form a magnetic shield plate, and the area of the magnetic shield plate matches with an area of an oil tank (3), to be shielded; the magnetic shield plate and the oil tank are integrally fixed through fasteners, the whole magnetic shield plate is symmetric about a center line of a transformer body and arranged along the long axis of the oil tank, a grain rolling direction of the silicon steel sheets in the magnetic shield plate is the height-wise direction of the oil tank. The problems that the oil tank magnetic shield structure of the background art experiences high loss, high noise, excessive local oil tank temperature and the like due to non-uniform distribution of flux at all parts of the magnetic shield are basically solved; availability of materials is improved, the shape of electrodes in transformers is significantly improved, and electrical insulation allowance is increased.
Description
Technical field
The present invention relates to a kind of oil tank of transformer magnetic screen 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, cause transformer leakage flux total amount very large, in order to reduce stray loss of transformer, and prevent because a large amount of leakage fluxs are passed through the fuel tank local overheating that fuel tank causes, 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: silicon steel sheet is cut into the wide strip of specified width, which width, then blocks of sticky be 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 inhomogeneous, and the magnetic of the silicon steel sheet of close Qi Shen center one side 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 inhomogeneous with the close distribution of magnetic in the magnetic shield panel of two side positions, the close maximum of device body center magnetic, and it is lower the closer to both sides, and because rolling face, magnetic screen lath faces main leakage direction, make the loop path of eddy current elongated, it is large that eddy current loss becomes; In this type of fuel tank shielding, transformer leakage flux transverse crossing phenomenon between the sticky folded thickness direction upper slice of barricade is also comparatively serious, and it is the maximum reason that causes abnormal eddy current loss that this type of leakage field passes through, so abnormal eddy current loss increases greatly.Because arrange after magnetic screen, need to weld bent plate to fix magnetic shield panel in fuel tank again, cause the interior facade of fuel tank to become height fluctuating, electrode shape is very not good, and insulation margin diminishes, and need 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), it is large that noise also becomes thereupon, easily produce fuel tank local overheating problem, and reduced 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 oil tank of transformer magnetic screen with the alert function of magnetic, improves the utilance of material; And its electrode shape is also improved significantly, improve electric insulation nargin, solve the problem existing in background technology.
Technical scheme of the present invention is:
A kind of oil tank of transformer magnetic screen with the alert function of magnetic, silicon steel sheet is cut into strip, then blocks of sticky folded, in the middle of sticky folded silicon steel sheet, place some copper bars, make together magnetic shield panel, the area that the area of magnetic shield panel and fuel tank need to shield matches; 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 the thickness direction of silicon steel sheet in magnetic shield panel faces main leakage, make the loop path of eddy current become very short, greatly reduced the generation of eddy current; And due to eddy current reduce magnetic flux is uniformly distributed at fuel tank short-axis direction.
In the middle of described sticky folded silicon steel sheet, place some copper bars, some copper bars are divided into several regions by magnetic shield panel, utilize the diamagnetic performance of copper bar to carry out subregion to magnetic screen, according to the area difference of each sectional magnetic barricade, control the magnetic resistance in each region, make the magnetic resistance in each region basic identical, make leakage flux realize and 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 increasing after 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, as police commander, leakage field is taken their own roads, be distributed in uniformly each position of fuel tank shielding, between the sheet of the local silicon steel disc of fuel tank magnetic shield panel and sheet, 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 solved background technology fuel tank magnet shielding structure due to magnetic screen each position magnetic flux distribution inhomogeneous cause the problem such as loss large, noise large, fuel tank local overheating; Improve the utilance of material, and its electrode shape has also been improved significantly, improved 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 oil tank of transformer magnetic screen with the alert function of magnetic, silicon steel sheet is cut into strip, then blocks of sticky folded, in the middle of sticky folded silicon steel sheet 1, place some copper bars 2, make together magnetic shield panel, the area of magnetic shield panel and fuel tank 3 need the area of shielding 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 the thickness direction of silicon steel sheet in magnetic shield panel faces main leakage, make the loop path of eddy current become very short, greatly reduced the generation of eddy current; And due to eddy current reduce magnetic flux is uniformly distributed at fuel tank short-axis direction.
In the middle of described sticky folded silicon steel sheet, place some copper bars, some copper bars are divided into several regions by magnetic shield panel, utilize the diamagnetic performance of copper bar to carry out subregion to magnetic screen, according to the area difference of each sectional magnetic barricade, control the magnetic resistance in each region, make the magnetic resistance in each region basic identical, make leakage flux realize and being uniformly distributed on the magnetic shield panel of transformer body center and both sides, realize the alert function of magnetic.
Claims (2)
1. the oil tank of transformer magnetic screen with the alert function of magnetic, it is characterized in that: silicon steel sheet is cut into strip, then blocks of sticky folded, in the middle of sticky folded silicon steel sheet (1), place some copper bars (2), make together magnetic shield panel, the area of magnetic shield panel and fuel tank (3) need the area of shielding 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.
2. a kind of oil tank of transformer magnetic screen with the alert function of magnetic according to claim 1, it is characterized in that placing some copper bars in the middle of described sticky folded silicon steel sheet, some copper bars are divided into several regions by magnetic shield panel, utilize the diamagnetic performance of copper bar to carry out subregion to magnetic screen, according to the area difference of each sectional magnetic barricade, control the magnetic resistance in each region, make the magnetic resistance in each region basic identical, make leakage flux realize and 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 |
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| CN103730238A true CN103730238A (en) | 2014-04-16 |
| CN103730238B CN103730238B (en) | 2016-01-20 |
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| Application Number | Title | Priority Date | Filing Date |
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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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Cited By (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 |
| CN106583887A (en) * | 2016-12-15 | 2017-04-26 | 保定天威电气设备结构有限公司 | Magnetic shielding welding cracking prevention method for power transformer oil 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 |
| CN110556959A (en) * | 2019-09-29 | 2019-12-10 | 长江勘测规划设计研究有限责任公司 | Novel electromagnetic shielding structure of giant water turbine generator in strong electromagnetic environment |
Citations (3)
| 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 |
| US20020196117A1 (en) * | 1999-12-03 | 2002-12-26 | Hitachi, Ltd. | Stationary induction apparatus |
| CN203225167U (en) * | 2013-04-05 | 2013-10-02 | 国家电网公司 | Magnetic shield for transformers |
-
2013
- 2013-12-25 CN CN201310725325.1A patent/CN103730238B/en active Active
Patent Citations (3)
| 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 |
| US20020196117A1 (en) * | 1999-12-03 | 2002-12-26 | Hitachi, Ltd. | Stationary induction apparatus |
| CN203225167U (en) * | 2013-04-05 | 2013-10-02 | 国家电网公司 | Magnetic shield for transformers |
Cited By (5)
| 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 |
| CN106583887A (en) * | 2016-12-15 | 2017-04-26 | 保定天威电气设备结构有限公司 | Magnetic shielding welding cracking prevention method for power transformer oil 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 |
| CN110556959A (en) * | 2019-09-29 | 2019-12-10 | 长江勘测规划设计研究有限责任公司 | Novel electromagnetic shielding structure of giant water turbine generator in strong electromagnetic environment |
| 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 |
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|---|---|
| CN103730238B (en) | 2016-01-20 |
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