CN206921662U - Power transformer with magnetic screen - Google Patents
Power transformer with magnetic screen Download PDFInfo
- Publication number
- CN206921662U CN206921662U CN201720700934.5U CN201720700934U CN206921662U CN 206921662 U CN206921662 U CN 206921662U CN 201720700934 U CN201720700934 U CN 201720700934U CN 206921662 U CN206921662 U CN 206921662U
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- Prior art keywords
- magnetic
- magnetic shielding
- magnetic shield
- power transformer
- strip
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Abstract
It the utility model is related to a kind of power transformer for the material cost that magnetic shield member is saved while good Magnetic Shielding Effectiveness is obtained.This power transformer with magnetic screen includes a casing and at least one magnetic shield member.The magazine ac has at least one iron core and at least one set of winding for being sheathed on the iron core.On at least one magnetic shield member is arranged on the inside of the tank wall of the casing.Wherein, at least a portion of each magnetic shield member be located at leakage magnetic flux is larger in the power transformer position and its at least another part is located at the less position of leakage magnetic flux in the power transformer.Described at least a portion of each magnetic shield member has thickness difference with described at least another part.
Description
Technical Field
The utility model relates to a power transformer especially relates to a power transformer with magnetic screen.
Background
The losses of the transformer can be classified into iron losses, copper losses, and stray losses. When the primary winding of the transformer is energized, the magnetic flux generated by the coil flows in the core, and thus the core induces a current in a plane perpendicular to the magnetic lines of force to form an eddy current. The losses resulting from such eddy currents in the transformation are called core losses. The windings of the transformer have resistances, and the current flowing through the windings consumes a certain amount of power, which results in transformer losses, and such losses are called copper losses. In addition, a certain amount of leakage flux is included in the magnetic flux generated by the transformer, and transformer loss caused by the leakage flux is referred to as stray loss.
For a multiphase transformer, the magnitude of the leakage flux at different locations may be different. However, magnetic shield members currently used for magnetic shielding of a multiphase transformer adopt uniform specifications, and therefore magnetic shielding may not be performed well at a position where leakage magnetic flux is large, or an excessive number of magnetic shield members may be arranged at a position where leakage magnetic flux is small.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a save magnetic screen member's material cost's power transformer when obtaining good magnetic screen effect. The magnetically shielded power transformer includes a tank and at least one magnetic shield member. The box body contains at least one iron core and at least one group of winding sleeved on the iron core. The at least one magnetic shield member is provided on a wall inner side of the case. Wherein at least one part of each of the magnetic shield members is located at a position where leakage magnetic flux is large in the power transformer and at least another part thereof is located at a position where leakage magnetic flux is small in the power transformer. The at least one portion and the at least another portion of each of the magnetic shield members have a difference in thickness. The utility model discloses a power transformer sets up the magnetic screen member that thickness is different according to the size of magnetic leakage flux to the thickness that makes magnetic screen member in the great position of the magnetic leakage flux of transformer is bigger, and the thickness that makes magnetic screen member in the less position of the magnetic leakage flux of transformer is littleer. Therefore, a good leakage flux shielding effect can be achieved, and the material cost of the magnetic shielding member can be saved, thereby reducing the cost of the transformer.
According to an aspect of the invention, the power transformer is a polyphase power transformer. The thickness of the part of each magnetic shield member located in the middle of the tank wall is larger than the thickness of the parts located in the upper and lower parts of the tank wall.
According to another aspect of the present invention, each of the magnetic shield members includes a plurality of magnetic shield strips provided perpendicularly to the case wall in a stacked state with each other. The plurality of magnetic shield strips have a length difference therebetween.
According to another aspect of the present invention, the magnetic shield member includes a first magnetic shield strip, a second magnetic shield strip and a third magnetic shield strip. Wherein the first magnetic shielding strip is disposed on the tank wall, the second magnetic shielding strip is disposed on the first magnetic shielding strip and has a length smaller than that of the first magnetic shielding strip, and the third magnetic shielding strip is disposed on the second magnetic shielding strip and has a length smaller than that of the second magnetic shielding strip. The magnetic shield member has a multi-step structure, which can achieve a good leakage flux shielding effect and reduce the cost at the same time.
According to another aspect of the present invention, the thickness of the first magnetic shielding strip, the second magnetic shielding strip and the third magnetic shielding strip is 8 mm.
According to yet another aspect of the present invention, the first magnetic shield strip, the second magnetic shield strip and the third magnetic shield strip are welded to each other.
Drawings
The following drawings are intended to illustrate and explain the present invention without limiting the scope of the invention. Wherein,
FIG. 1 is a partially schematic perspective block diagram of a power transformer in accordance with an exemplary embodiment;
FIG. 2 is a top view of the magnetic shield member of FIG. 1 according to an exemplary embodiment;
fig. 3 is a side view of the magnetic shield member of fig. 1 according to an exemplary embodiment.
Description of reference numerals:
100 case 110 wall
300 magnetic shield member
310 first magnetic shield strip 330 second magnetic shield strip 350 third magnetic shield strip
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings.
Fig. 1 illustrates a schematic perspective structure view of a transformer according to an exemplary embodiment. As shown in fig. 1, the power transformer having magnetic shielding according to the exemplary embodiment includes one case 100 and at least one magnetic shielding member 300. Here, the power transformer according to an exemplary embodiment may be a multi-phase power transformer, such as a 240MVA/220kV three-phase power transformer, a 180MVA/220kV three-phase power transformer, or the like. The box 100 contains at least one iron core and at least one set of windings sleeved on the iron core. The case 100 has a case wall 110 to define a receiving space for receiving components such as a core and a winding.
The magnetic shield member 300 is provided in the case 100, for example, the magnetic shield member 300 is provided on the inner side of the case wall 110 as shown in fig. 1. According to an exemplary embodiment, the magnetic shield member 300 has a thickness difference between portions at different leakage magnetic fluxes. At least one portion of each magnetic shield member 300 is located at a position where leakage flux is large in the power transformer and at least another portion thereof is located at a position where leakage flux is small in the power transformer. The at least one portion and the at least another portion of each magnetic shield 300 have a difference in thickness, that is, the at least one portion of the magnetic shield 300 and the at least another portion of the same magnetic shield 300 have different thicknesses. Generally in the case of a multiphase power transformer, the leakage flux in the middle of the tank wall is generally greater than in the upper and lower parts of the tank wall. Therefore, as shown in fig. 1, the thickness of the magnetic shield member 300 located in the middle of the tank wall 110 is larger than the thickness of the magnetic shield members 300 located in the upper and lower portions of the tank wall 110. Thus, the cost of the magnetic shield member can be saved while satisfying the demand of the leakage flux shield.
Fig. 2 shows a top view of a magnetic shield according to an exemplary embodiment, and fig. 3 shows a side view of a magnetic shield according to an exemplary embodiment. As shown in fig. 2 and 3, each magnetic shield 300 may include a plurality of magnetic shield strips, for example, three magnetic shield strips, disposed on top of each other perpendicular to the tank wall 110: a first magnetic shield strip 310, a second magnetic shield strip 330, a third magnetic shield strip 350. Here, the magnetic shield strip may be made of a magnetic shield material such as a silicon steel sheet, for example, a silicon steel sheet having a thickness of 8 mm. Further, the magnetic shield strips may be welded to each other. Although only one magnetic shield member is shown in fig. 1 to 3, the power transformer may further include a plurality of magnetic shield members arranged in parallel with each other. There is a difference in length between the plurality of magnetic shield strips, that is, the first magnetic shield strip 310, the second magnetic shield strip 330, and the third magnetic shield strip 350 can have different lengths from each other, so that the magnetic shield members 300 having different thicknesses are formed by stacking the magnetic shield strips having different lengths. For example, magnetic shield strips different in length may be provided in a stack such that the thickness of a portion of the magnetic shield 300 located in the middle of the tank wall is larger than the thickness of a portion of the magnetic shield 300 located in the upper portion of the tank wall and a portion located in the lower portion of the tank wall. For this reason, as shown in fig. 3, it may be arranged that the length of the magnetic shield strip near the tank wall 110 is longer than the length of the magnetic shield strip far from the tank wall 110. For example, the first magnetic shield strip 310 disposed on the inner side of the case wall 110 has the longest length, the length of the second magnetic shield strip 330 disposed on the first magnetic shield strip 310 is smaller than the length of the first magnetic shield strip 310, and the length of the third magnetic shield strip 350 disposed on the second magnetic shield strip 330 is smaller than the length of the second magnetic shield strip 330. In other words, as shown in fig. 3, the magnetic shield member 300 according to the exemplary embodiment may have a stepped shape.
However, the exemplary embodiment is not limited thereto, and in other exemplary embodiments, the magnetic shield members located at positions where the leakage magnetic flux of the transformer is different among the plurality of magnetic shield members may have different thicknesses as long as it is satisfied that a thickness of a portion of the magnetic shield member located at a position where the leakage magnetic flux of the transformer is large is greater than a thickness of a portion of the magnetic shield member located at a position where the leakage magnetic flux of the transformer is small.
Therefore, according to the exemplary embodiment, it is possible to provide the magnetic shield members having different thicknesses in each portion according to the magnitude of the leakage magnetic flux, so that the portion of the magnetic shield member having the larger thickness is provided at the position where the leakage magnetic flux of the power transformer is large, and the portion of the magnetic shield member having the smaller thickness is provided at the position where the leakage magnetic flux of the power transformer is small. In other words, the magnetic shield member according to the exemplary embodiment may have a structure of multi-steps. Therefore, a good leakage flux shielding effect can be achieved, and the material cost of the magnetic shielding member can be saved, thereby reducing the cost of the transformer.
It should be understood that although the present description has been described in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.
The above description is only exemplary of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes, modifications and combinations that may be made by those skilled in the art without departing from the spirit and principles of the invention should be considered within the scope of the invention.
Claims (7)
1. Power transformer with magnetic shielding, characterized in that it comprises:
the box body (100) is used for accommodating at least one iron core and at least one group of windings sleeved on the iron core; and the number of the first and second groups,
at least one magnetic shield member (300) provided on an inner side of a wall (110) of the case (100);
wherein at least one portion of each of the magnetic shield members (300) is located at a position where leakage magnetic flux in the power transformer is large and at least another portion thereof is located at a position where leakage magnetic flux in the power transformer is small, the at least one portion and the at least another portion of each of the magnetic shield members (300) having a thickness difference.
2. Power transformer with magnetic shielding according to claim 1, characterized in that it is a polyphase power transformer, the thickness of each magnetic shielding member (300) being greater in the middle part of the tank wall (110) than in the upper and lower parts of the tank wall (110).
3. Magnetic shield according to claim 2, characterized in that each of the magnetic shield members (300) comprises a plurality of magnetic shield strips arranged on top of each other perpendicular to the tank wall (110), with a length difference between them.
4. Electrical transformer with magnetic shielding according to claim 3, characterized in that the length of the magnetic shielding strip close to the tank wall (110) is larger than the length of the magnetic shielding strip remote from the tank wall (110).
5. A power transformer with magnetic shielding according to claim 4, characterized in that said magnetic shielding means (300) comprises a first magnetic shielding strip (310), a second magnetic shielding strip (330) and a third magnetic shielding strip (350), wherein said first magnetic shielding strip (310) is arranged on said tank wall (110), said second magnetic shielding strip (330) is arranged on said first magnetic shielding strip (310) and its length is smaller than the length of said first magnetic shielding strip (310), said third magnetic shielding strip (350) is arranged on said second magnetic shielding strip (330) and its length is smaller than the length of said second magnetic shielding strip (330).
6. Electrical transformer with magnetic shielding according to claim 5, characterized in that the thickness of the first magnetic shielding strip (310), the second magnetic shielding strip (330) and the third magnetic shielding strip (350) are all 8 mm.
7. Electrical transformer with magnetic shielding according to claim 6, characterized in that the first magnetic shielding strip (310), the second magnetic shielding strip (330) and the third magnetic shielding strip (350) are welded to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720700934.5U CN206921662U (en) | 2017-06-16 | 2017-06-16 | Power transformer with magnetic screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720700934.5U CN206921662U (en) | 2017-06-16 | 2017-06-16 | Power transformer with magnetic screen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206921662U true CN206921662U (en) | 2018-01-23 |
Family
ID=61321563
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720700934.5U Expired - Fee Related CN206921662U (en) | 2017-06-16 | 2017-06-16 | Power transformer with magnetic screen |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206921662U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108572334A (en) * | 2018-06-01 | 2018-09-25 | 南方电网科学研究院有限责任公司 | Abnormal magnetic flux leakage monitoring system for transformer |
-
2017
- 2017-06-16 CN CN201720700934.5U patent/CN206921662U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108572334A (en) * | 2018-06-01 | 2018-09-25 | 南方电网科学研究院有限责任公司 | Abnormal magnetic flux leakage monitoring system for transformer |
| CN108572334B (en) * | 2018-06-01 | 2020-05-26 | 南方电网科学研究院有限责任公司 | Abnormal magnetic flux leakage monitoring system for transformer |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180123 |
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| CF01 | Termination of patent right due to non-payment of annual fee |