CN201975239U - Electromagnetic composite shielding device for transformer - Google Patents
Electromagnetic composite shielding device for transformer Download PDFInfo
- Publication number
- CN201975239U CN201975239U CN2010206053546U CN201020605354U CN201975239U CN 201975239 U CN201975239 U CN 201975239U CN 2010206053546 U CN2010206053546 U CN 2010206053546U CN 201020605354 U CN201020605354 U CN 201020605354U CN 201975239 U CN201975239 U CN 201975239U
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- transformer
- magnetic
- shielding device
- screen
- shield
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Abstract
The utility model relates to the technical field of magnetic leakage shielding of power equipment, in particular to an electromagnetic composite shielding device for a transformer. The electromagnetic composite shielding device comprises an electric shield (2) and a magnetic shield (3), wherein the magnetic shield (3) is arranged on the side wall inside an oil tank of the transformer; the upper part of the magnetic shield (3) is higher than a transformer coil and the edge of the oil tank; a lug boss is arranged at the upper part of the magnetic shield (3); the electric shield (2) is arranged at the inner side part of an oil tank cover (1); the lower end of the electric shield (2) is lapped to the outside at the upper part of the magnetic shield (3) and is matched and contacted with the lug boss of the magnetic shield (3); and a grounding base (4) is arranged below the magnetic shield (3). By using the electromagnetic composite shielding device, the magnetic leakage on the edge of the oil tank as a key part can be effectively prevented, the problem that oil leaks from the part between apertures of the oil tank as a key point in the electromagnetic shield is solved. The electromagnetic composite shielding device has the characteristics of reasonable structure, favorable magnetic leakage shielding effect, and the like; the electromagnetic composite shielding device is simple and reliable in installation; and the stray loss is reduced and the local overheat is eliminated.
Description
Technical field
The utility model relates to a kind of magnetic leakage shielding technical field of power equipment, specifically a kind of electromagnetism composite shielding device of transformer.
Background technology
The stray field of transformer is by winding and the common generation of wire current, the capacity of transformer is big more, stray field is just strong more, thereby the various supplementary load loss that the stable state stray field is caused increase, if design the improper local overheating that will cause transformer, the hot property of transformer is degenerated, finally cause the heat ageing and the puncture of insulating material.These problems have a strong impact on transformer's life span and safe operation, and this just needs to use shield technology.Shielding is by shields such as the shell that is made of metal, box, plates, and electromagnetic wave is confined to a kind of method in a certain zone.Extra-high-voltage large-capacity transf designs and produces in the process at present, is improving the stray field distribution for products with larger capacity, reduces stray loss and eliminates single magnetic screen or the electric screen of the general employing of local overheating.The essence of electric screen is the influence that reduces two equipment or two interelement electric field inductions.The principle of electric screen is under the condition that guarantees good earth, the interference that interference source produced is ended at the shield of being made by good conductor.Magnetic screen is to provide the flux path of low magnetic resistance by shield to disturbing magnetic field, thereby disturbing magnetic field is shunted.The hole seam leakage of shield is the controlling element of electromagnetic shielding most critical in the transformer.Always there is the leakage field at some position to be difficult to obtain shielding when adopting magnetic screen or electric screen separately on the fuel tank, in effect aspect reduction stray loss and the elimination local overheating is not clearly, particularly the leakage between the seam of fuel tank hole is suppressed traditional electricity, magnetic screen design and can not play good effect.
Summary of the invention
In order to overcome above-mentioned defective, it is a kind of rational in infrastructure that the utility model provides, and reduces stray loss, eliminates local overheating, to the effective transformer composite shielding device of fuel tank magnetic leakage shielding.
The technical solution adopted in the utility model is: a kind of transformer electromagnetism composite shielding device, comprise electric screen and magnetic screen, described magnetic screen is arranged on the sidewall of oil tank of transformer inside, this magnetic screen top is higher than the case edge of transformer coil and fuel tank, the top of magnetic screen is provided with boss, and described electric screen is arranged on the fuel tank cap inside portion, and the lower end of electric screen is overlapped on the upper outside of described magnetic screen, and coincide with the boss of magnetic screen and to contact, grounding base is set below magnetic screen.
Place, base angle in the fuel tank bottom is tiltedly installed with electric screen.
Also be provided with the shielding rod in the both sides of magnetic screen.
Earth stud outer setting radome at fuel tank.
The utility model has adopted the method for electric screen and magnetic screen composite shielding, utilizes the good characteristics of suitable type of electric screen, it is pressed the bending of tank wall shape after, directly be welded on the case lid.The magnetic screen setting is higher than fuel tank case edge, and boss is set at an upper portion thereof, and can make things convenient for electric screen to closely cooperate, prevent the leakage field phenomenon of fuel tank case along this key position, solve between the seam of fuel tank hole and leak critical technical problems in this electromagnetic shielding, and be convenient to the assembling of case lid; Be welded with grounding base in bottom, can make the good ground connection of magnetic screen, can bear the weight of a part of magnetic screen again, make firm being fixed on the tank wall of magnetic screen safety near magnetic screen; Be provided with the shielding rod at the magnetic screen two ends, and be buckled with radome, can effectively shield like this wedge angle that brings behind the electromagnetic shielding is installed, prevent partial discharge in the earth stud outside.
Description of drawings
Fig. 1 is a structural representation of the present utility model
Fig. 2 is the A portion enlarged drawing of Fig. 1
Embodiment
Now in conjunction with the accompanying drawings the utility model is further described, Fig. 1 is a kind of embodiment of the present utility model, mainly comprise electric screen 2 and magnetic screen 3 etc., in the transformer body arranged outside fuel tank is arranged, described magnetic screen 3 is arranged on the sidewall of this fuel tank internal, these magnetic screen 3 tops are higher than the case edge of transformer coil and fuel tank, and the top of magnetic screen 3 is provided with boss.Magnetic screen 3 is normally made by silicon steel sheet, because magnetic screen 3 is at tank internal surface, magnetic permeability is than higher, and at this moment the magnetic flux that entered fuel tank originally enters into magnetic screen 3, can effectively eliminate the local overheating of oil tank wall like this.Described electric screen 2 is arranged on fuel tank cap 1 madial wall.The shape of usually oil case lid 1 is irregular since electric screen 2 to have suitable type good, electric screen 2 by after the shape bending of institute's liner case lid 1, directly is welded on the sidewall of case lid 1.Present embodiment also is that electric screen 2 also is set on the lower box in the bottom of fuel tank, and electric screen 2 herein is arranged on the place, base angle of lower box, is skewed.Be arranged on the electric screen 2 on the case lid 1, its lower end is overlapped on the upper outside of described magnetic screen 3, and contacts with the boss of magnetic screen 3 is identical.Prevent the leakage field phenomenon of fuel tank case like this, solve between the seam of fuel tank hole and leak critical technical problems in this electromagnetic shielding, also be convenient to the assembling of case lid 1 simultaneously along this key position.Grounding base 4 is set below magnetic screen 3, below near magnetic screen 3, welds grounding base 4 in the present embodiment, can make magnetic screen 3 good ground connection, can bear the weight of a part of magnetic screen 3 again, make firm being fixed on the tank wall of magnetic screen 3 safety.The utility model can also be provided with the shielding rod in the both sides of magnetic screen 3, also can effectively shield like this wedge angle that brings behind the electromagnetic shielding is installed at the earth stud outer setting radome of fuel tank, prevents partial discharge.The utility model can also install copper coin or aluminium sheet additional as liner on irregular positions such as case lid 1 inwall, copper coin or the aluminium sheet eddy current of will inducting under the stray field effect.This eddy current will stop leakage flux to enter oil tank wall, thereby reduce supplementary load loss.Certainly, also have certain eddy current loss in copper coin or the aluminium sheet, but because the resistance of copper coin or aluminium sheet is little, so loss is also little.So can reduce the stray loss of fuel tank, simultaneously magnetic line of force degree of crook is reduced, thereby the eddy current that horizontal leakage field component produces in the winding conducting wire is reduced, strengthen shield effectiveness.
This shows, the utlity model has rational in infrastructurely that install simple and reliablely, to reducing stray loss, it is effective to eliminate local overheating, particularly to case along waiting key position can carry out good magnetic leakage shielding, eliminate local overheating.The utility model not only can be used for transformer, can also conspicuously use in the magnetic leakage shielding of other large scale electrical power unit.
Claims (4)
1. transformer electromagnetism composite shielding device, it is characterized in that: comprise electric screen (2) and magnetic screen (3), described magnetic screen (3) is arranged on the sidewall of oil tank of transformer inside, this magnetic screen (3) top is higher than the case edge of transformer coil and fuel tank, the top of magnetic screen (3) is provided with boss, described electric screen (2) is arranged on fuel tank cap (1) inside portion, the lower end of electric screen (2) is overlapped on the upper outside of described magnetic screen (3), and coincide with the boss of magnetic screen (3) and to contact, in the below of magnetic screen (3) grounding base (4) is set.
2. transformer electromagnetism composite shielding device according to claim 1 is characterized in that: the place, base angle in the fuel tank bottom is tiltedly installed with electric screen (2).
3. transformer electromagnetism composite shielding device according to claim 1 is characterized in that: also be provided with the shielding rod in the both sides of magnetic screen (3).
4. transformer electromagnetism composite shielding device according to claim 1 is characterized in that: at the earth stud outer setting radome of fuel tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206053546U CN201975239U (en) | 2010-11-02 | 2010-11-02 | Electromagnetic composite shielding device for transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206053546U CN201975239U (en) | 2010-11-02 | 2010-11-02 | Electromagnetic composite shielding device for transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201975239U true CN201975239U (en) | 2011-09-14 |
Family
ID=44580337
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206053546U Expired - Fee Related CN201975239U (en) | 2010-11-02 | 2010-11-02 | Electromagnetic composite shielding device for transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201975239U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108735455A (en) * | 2018-05-18 | 2018-11-02 | 云南电网有限责任公司电力科学研究院 | A kind of device for oil-immersed type transformer interior waterproof point diffusion |
| CN109300654A (en) * | 2018-11-14 | 2019-02-01 | 江苏思源赫兹互感器有限公司 | A kind of 118KV energy supply transformer |
-
2010
- 2010-11-02 CN CN2010206053546U patent/CN201975239U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108735455A (en) * | 2018-05-18 | 2018-11-02 | 云南电网有限责任公司电力科学研究院 | A kind of device for oil-immersed type transformer interior waterproof point diffusion |
| CN109300654A (en) * | 2018-11-14 | 2019-02-01 | 江苏思源赫兹互感器有限公司 | A kind of 118KV energy supply transformer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110914 Termination date: 20171102 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |