CN203423029U - Magnetic shielding structure for transformer oil tank - Google Patents
Magnetic shielding structure for transformer oil tank Download PDFInfo
- Publication number
- CN203423029U CN203423029U CN201320385068.7U CN201320385068U CN203423029U CN 203423029 U CN203423029 U CN 203423029U CN 201320385068 U CN201320385068 U CN 201320385068U CN 203423029 U CN203423029 U CN 203423029U
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- oil tank
- shielding structure
- magnetic screen
- magnetic shielding
- transformer
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Abstract
The utility model relates to a magnetic shielding structure for a transformer oil tank. The magnetic shielding structure is arranged in the oil tank, an opening is formed in the middle of the oil tank, a protection frame, a ground connection seat and a fixed support are welded to the wall of the oil tank, a magnetic shielding part is fixedly arranged on the fixed support, and the magnetic shielding part is connected with the ground connection seat. The magnetic shielding structure solves the technical problem that due to the fact that the opening is formed in the middle of the oil tank, a magnetic shielding part of a general structure cannot be distributed in voltage class of 330kV or more than 330kV. By means of horizontal distribution, the amount of oil entering the wall of the oil tank is effectively reduced, the additional loss of a transformer is reduced, and the temperature of the wall of the oil tank is reduced.
Description
Technical field
The utility model relates to transformer technology field, especially a kind of oil tank of transformer magnet shielding structure.
Background technology
Along with the problems such as environmental protection, energy resource consumption are more and more paid attention to, the requirement of all trades and professions " energy-saving and emission-reduction " is day by day strengthened.In electric power system, transformer is as one of crucial power equipment, and its loss objective also more receives publicity.The loss of transformer is comprised of no-load loss and load loss.Reduce transformer running wastage key and be to reduce its load loss.Stray loss in the eddy current of transformer load loss in resistance loss, coil and circulation loss, structural member (core structure part, fuel tank) forms.Eddy current loss in resistance loss and coil can be by increasing conductor cross-section, changing wire shape and adopt suitable transposition to reduce, and the stray loss in structural member reduces needs to use the shield technology that this patent is mentioned.
The leakage flux being produced by load current during transformer load operation will form loop by inner structural members, fuel tank etc., and produce loss in said structure part.Traditional fuel tank shield technology is to adopt silicon steel sheet to be longitudinally vertically laid on oil tank wall, makes magnetic flux enter the better silicon steel sheet of magnetic property and less enters tank wall, realizes the object that reduces tank loss.This structural requirement silicon steel sheet is arranged from top to bottom, and centre can not disconnect, otherwise not only have effect, can not run counter to desire on the contrary.For 330kV and above product, because high pressure head end insulation level is higher, outlet in the middle part of general employing, now fuel tank middle part needs to arrange larger wire hole, and the magnetic screen of longitudinally arranging cannot directly be laid in oil tank wall.The scheme adopting generally has two kinds: 1, cancel high-pressure side tank wall magnetic screen, increase the distance between oil tank wall and coil, reduce the quantity that leakage flux enters fuel tank, and design lower resistance loss with the large tank loss of compensate for slower; 2, between the magnetic screen of gap and oil tank wall, copper coin is set as copper shield, the diamagnetic effect by copper shield stops magnetic flux to enter the tank wall of tapping.
To sum up: 330kV and above transformer be due to the reasons in structure of middle part outlet perforate, the fuel tank magnetic screen difficult arrangement of conventional structure, the effect of realization is poor, and causes manufacturing cost to increase.
Utility model content
The technical problems to be solved in the utility model is: provide a kind of be for the large-capacity power high voltage side of transformer fuel tank magnetic screen of 330kV and above cannot install, the oil tank of transformer magnet shielding structure of the unfavorable factor such as shield effectiveness reduction, manufacturing cost increase
The utility model solves the technical scheme that its technical problem adopts: a kind of oil tank of transformer magnet shielding structure, be installed in the fuel tank of middle part perforate, and on described oil tank wall, be welded with and protect frame, grounding base and fixed support; On described fixed support, fixed placement has magnetic screen; Described magnetic screen is connected with grounding base.
Specifically, fuel tank described in the utility model middle part has perforate, described protects the upper and lower that frame is arranged on perforate; The end of frame is protected in described grounding base setting.
Further, magnetic screen described in the utility model is formed by silicon steel sheet stack; The end of the silicon steel sheet that stack is good has glue-line; One end surface soldered ground strip of described magnetic screen, described ground strip is connected with grounding base; The surperficial coated insulation cardboard of described magnetic screen.
When described silicon steel sheet more in short-term, the thickness that adopts whole piece silicon steel sheet stack to become to need; When length dimension is larger, adopt the stack mode of multistage butt-welded side seam to build up corresponding thickness.
Principle of the present utility model is: utilize the principle that any instantaneous composite value of three-phase symmetrical component is 0, by magnetic screen transverse arrangement of turbo in the higher upper and lower end parts of leakage flux density, avoid the middle part wire hole of high voltage head end, make upper and lower end parts A, B, C three-phase leakage flux all enter transverse magnetic shielding, every closed and cancel out each other through other two-phase, greatly reduce the magnetic flux quantity that enters oil tank wall, realized the technical purpose that reduces the stray loss in oil tank wall.The loss of simultaneously magnetic screen itself also, due to magnetic flux cancel out each other effect and decline to some extent, further reduces loss.And theoretical by transformer: inner leakage flux is flowed into or is flowed out by coil upper and lower end parts, mainly concentrates on end winding, has shielded the leakage field of end winding, can solve loss and local problems of excessive heat that leakage flux produces in oil tank wall.
The beneficial effects of the utility model are, solved the defect existing in background technology, solved the technical barrier that 330kV and above cause the magnetic screen of conventional structure to arrange due to fuel tank middle part perforate, by adopting transverse arrangement of turbo, effectively reduce the quantity that enters oil tank wall, reduced the temperature of supplementary load loss and the oil tank wall of transformer.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the structural representation of magnetic screen;
Fig. 3 is the structural representation of another kind of magnetic screen;
In figure: 1, oil tank wall; 2, protect frame; 3, fixed support; 4, magnetic screen; 5, grounding base; 6, fuel tank middle part perforate; 7, silicon steel sheet; 8, insulating board; 9, ground strip; 10, the silicon steel sheet 1 of segmental structure; 11, the silicon steel sheet 2 of segmental structure; 12, magnetic screen end face.
Embodiment
With preferred embodiment, the utility model is described in further detail by reference to the accompanying drawings now.These accompanying drawings are the schematic diagram of simplification, basic structure of the present utility model is only described in a schematic way, so it only show the formation relevant with the utility model.
As shown in Figure 2,3, silicon steel sheet, by certain magnetic screen part that is sized to, when adopting whole piece silicon steel sheet stack more in short-term, magnetic screen is become to the thickness of needs; When length dimension is larger, adopt the stack mode of multistage butt-welded side seam to build up corresponding thickness, that is, silicon steel sheet stack is become to hour whole piece stack of 7(length dimension, when length dimension is larger, adopt 10 and 11 mode substep stacks).After stack completes 12 end brush coatings (4 end faces are all brushed, only illustrate in figure 1 end face), at magnetic screen one end surface soldered ground strip 9.Magnetic screen end face brush coating, outsourcing insulating board 8 post-dryings are solidified into integral body.
Install as shown in Figure 1, on oil tank wall 1, frame 2, fixed support 3 and grounding base 5 are protected in welding, by making complete magnetic screen, be laterally placed on oil tank wall corresponding to coil upper and lower end parts position, by fixed support, magnetic screen is fixed on oil tank wall reliably, magnetic screen ground strip is attached to fuel tank grounding base.
What in above specification, describe is embodiment of the present utility model, various not illustrating is construed as limiting flesh and blood of the present utility model, person of an ordinary skill in the technical field read after specification can to before described embodiment make an amendment or be out of shape, and do not deviate from essence and the scope of utility model.
Claims (5)
1. an oil tank of transformer magnet shielding structure, is installed in the fuel tank of middle part perforate, it is characterized in that: on described oil tank wall, be welded with and protect frame, grounding base and fixed support; On described fixed support, fixed placement has magnetic screen; Described magnetic screen is connected with grounding base.
2. a kind of oil tank of transformer magnet shielding structure as claimed in claim 1, is characterized in that: described fuel tank middle part has perforate, described protects the upper and lower that frame is arranged on perforate.
3. a kind of oil tank of transformer magnet shielding structure as claimed in claim 1, is characterized in that: the end of frame is protected in described grounding base setting.
4. a kind of oil tank of transformer magnet shielding structure as claimed in claim 1, is characterized in that: described magnetic screen is formed by silicon steel sheet stack; The end of the silicon steel sheet that stack is good has glue-line; One end surface soldered ground strip of described magnetic screen, described ground strip is connected with grounding base; The surperficial coated insulation cardboard of described magnetic screen.
5. a kind of oil tank of transformer magnet shielding structure as claimed in claim 4, is characterized in that: described silicon steel sheet whole piece stack or multistage butt-welded side seam stack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320385068.7U CN203423029U (en) | 2013-06-28 | 2013-06-28 | Magnetic shielding structure for transformer oil tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320385068.7U CN203423029U (en) | 2013-06-28 | 2013-06-28 | Magnetic shielding structure for transformer oil tank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203423029U true CN203423029U (en) | 2014-02-05 |
Family
ID=50022121
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320385068.7U Expired - Lifetime CN203423029U (en) | 2013-06-28 | 2013-06-28 | Magnetic shielding structure for transformer oil tank |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203423029U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107742571A (en) * | 2017-11-22 | 2018-02-27 | 中国西电电气股份有限公司 | A kind of vertical lamination overlength magnet shielding structure and its manufacturing process |
-
2013
- 2013-06-28 CN CN201320385068.7U patent/CN203423029U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107742571A (en) * | 2017-11-22 | 2018-02-27 | 中国西电电气股份有限公司 | A kind of vertical lamination overlength magnet shielding structure and its manufacturing process |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140205 |