CN201435298Y - Magnetic shield - Google Patents
Magnetic shield Download PDFInfo
- Publication number
- CN201435298Y CN201435298Y CN2008201749101U CN200820174910U CN201435298Y CN 201435298 Y CN201435298 Y CN 201435298Y CN 2008201749101 U CN2008201749101 U CN 2008201749101U CN 200820174910 U CN200820174910 U CN 200820174910U CN 201435298 Y CN201435298 Y CN 201435298Y
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- silicon steel
- steel sheet
- magnetic screen
- ground strip
- sheet
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Abstract
The utility model relates to a magnetic shield, which belongs to the field of transformers. The magnetic shield comprises a group of silicon steel sheets, a ground strip and a ground bolt, wherein thesilicon steel sheet are connected with the ground bolt through the ground strip; and the ground strip is arranged between the outermost silicon steel sheet and the secondary outside silicon steel sheet far away from a box wall, and is connected with the outermost silicon steel sheet. The magnetic shield provided by the utility model has a simple and novel structure, and significant effect, can effectively avoid various problems caused by the poor contact of sheet magnetic shields, and has low cost.
Description
Technical field
The utility model relates to field transformer, specifically is a kind of magnetic screen that is applied in the oil tank of transformer.
Background technology
In general, transformer all exists loss, particularly high-power transformer, and its loss is sizable.In order to reduce loss and to eliminate the local overheating of oil tank wall, adopt fuel tank internal that magnetic screen is set usually at transformer.
The fuel tank magnetic screen is made with silicon steel plate, is arranged on tank internal surface, and magnetic permeability is than higher, and the magnetic flux that entered fuel tank has originally then entered into magnetic screen.At this moment, the dispersion loss in the mailbox greatly too reduces, and magnetic flux produces loss in magnetic screen, and the loss in the magnetic screen can be calculated according to the magnetic flux density in the magnetic screen.
The magnetic screen of using at present has two kinds of structures, a kind of is banded magnetic screen, be to be that the silicon steel sheet of H is wound in annulus with width, be pressed into tabularly again with the instrument plus-pressure, when using this kind magnetic screen, leakage flux enters magnetic screen by the thickness direction of silicon steel sheet, eddy current loss in the magnetic screen is little, but this production is trouble very, the cost height, and there be limited evidence currently of uses.Another kind of magnetic screen is the sheet magnetic screen, be that silicon steel sheet is cut into B * L sheet, after building up certain thickness H, be installed on the oil tank wall again, this magnetic screen is because leakage flux vertically enters magnetic screen, eddy current loss in magnetic screen is bigger, but manufacturing is more preceding a kind of simple, so adopts the sheet magnetic screens in the industry more.
The sheet magnetic screen will notice that in use it fixes and the ground connection performance.Present common practices is that ground strip is welded on the last sheet or the close silicon steel plate of tailpiece of comparison of close tank wall, and all the other silicon steel sheets compress with epoxy resin coating.If this kind method suitable operation can be good with magnetic screen ground connection, effectively reduce the wastage.But, often exist enamelling process control bad, make the phenomenon that occurs loose contact between the two-stage silicon steel sheet, like this, outside silicon steel sheet is because loose contact and inoperative; Cause current potential unsettled, caused partial discharge easily.
Summary of the invention
At above-mentioned problem, the utility model provides a kind of simple in structure, novel, novel magnetic screen of obvious results, the variety of issue that can effectively avoid the loose contact because of the sheet magnetic screen to cause.
The magnetic screen that this programme provides comprises one group of silicon steel sheet, one ground strip, an earth stud, silicon steel sheet is connected by ground strip with earth stud, described ground strip is arranged on away between outermost a slice silicon steel sheet of tank wall and the inferior outer a slice silicon steel sheet, is connected with outermost a slice silicon steel sheet.
Described silicon steel sheet is one group, is silicon steel sheet is cut into B * L sheet, build up certain thickness H after, be installed to again on the oil tank wall, its thickness is according to calculating, and is that prior art realizes easily, and then draws the quantity of needs according to the thickness of silicon steel sheet.
Preferably, described ground strip is fixedlyed connected with the outermost a slice silicon steel sheet away from tank wall.
Preferably, described ground strip be welded to connect away from outermost a slice silicon steel sheet of tank wall.
Do like this, win sheet silicon steel sheet and ground strip are welded together, connect oil tank wall by earth stud then, again by oil tank wall ground connection, " Faraday cage " of this formation, each parts equipotential all in it.Even inner certain sheet silicon steel sheet contact is not very good, also can avoid floating potential to cause the generation of partial discharge phenomenon, this is the principle place of this programme.
As from the foregoing, the utility model is by " Faraday cage " principle, designed a kind of magnetic screen relatively simple for structure, not only avoided because some silicon steel sheet that causes because of loose contact in the sheet magnetic screen is inoperative, also avoid it because of the partial discharge that suspension causes, improved the overall performance of transformer.The production challenge of banded relatively magnetic screen, its cost is very cheap, and the cost performance height can reach the demand of present transformer to parameter, has good using value.
Description of drawings
Fig. 1 is the structural representation of the utility model embodiment.
Wherein, 1. oil tank wall, 2. outermost a slice silicon steel sheet, 3. time outer a slice silicon steel sheet, 4. ground strip, 5. earth stud, 6. silicon steel sheet.
Embodiment
Embodiment with indefiniteness further explains, illustrates the technical program below.
A kind of magnetic screen, be welded on the oil tank wall 1, comprise one group of silicon steel sheet 6, one ground strip 4, one earth stud 5, silicon steel sheet 6 is connected by ground strip 4 with earth stud 5, and ground strip 4 is arranged between the outermost a slice silicon steel sheet 2 and inferior outer a slice silicon steel sheet 3 away from tank wall, is welded to connect with outermost a slice silicon steel sheet 2.
The concrete thickness of this group silicon steel sheet calculates as required, is to realize that easily its inner loss can be calculated according to the magnetic flux density in the magnetic screen in existing technology.Like this, at thickness, just can draw the quantity of the silicon steel sheet of concrete needs according to each sheet magnetic screen.
Like this, in use, because one " Faraday cage " forming, each parts equipotential all in it even inner certain sheet silicon steel sheet contact is not very good, also can avoid floating potential to cause the generation of partial discharge phenomenon, and is easy to use.
Claims (3)
1. magnetic screen comprises one group of silicon steel sheet, a ground strip, one earth stud, silicon steel sheet is connected by ground strip with earth stud, it is characterized in that: described ground strip is arranged on away between outermost a slice silicon steel sheet of tank wall and the inferior outer a slice silicon steel sheet, is connected with outermost a slice silicon steel sheet.
2. magnetic screen according to claim 1 is characterized in that: described ground strip is fixedlyed connected with outermost a slice silicon steel sheet.
3. magnetic screen according to claim 1 and 2 is characterized in that: described ground strip and outermost a slice silicon steel sheet are welded to connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008201749101U CN201435298Y (en) | 2008-11-07 | 2008-11-07 | Magnetic shield |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008201749101U CN201435298Y (en) | 2008-11-07 | 2008-11-07 | Magnetic shield |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201435298Y true CN201435298Y (en) | 2010-03-31 |
Family
ID=42054113
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008201749101U Expired - Fee Related CN201435298Y (en) | 2008-11-07 | 2008-11-07 | Magnetic shield |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201435298Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103050231A (en) * | 2012-12-27 | 2013-04-17 | 吴江市变压器厂有限公司 | Transformer oil tank and installation method thereof |
| CN103578698A (en) * | 2012-12-31 | 2014-02-12 | 大连信达变压器有限公司 | Novel transformer oil tank magnetic shielding mode |
| CN105761901A (en) * | 2016-02-19 | 2016-07-13 | 上海电机学院 | Magnetic shielding device of transformer oil tank |
-
2008
- 2008-11-07 CN CN2008201749101U patent/CN201435298Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103050231A (en) * | 2012-12-27 | 2013-04-17 | 吴江市变压器厂有限公司 | Transformer oil tank and installation method thereof |
| CN103578698A (en) * | 2012-12-31 | 2014-02-12 | 大连信达变压器有限公司 | Novel transformer oil tank magnetic shielding mode |
| CN105761901A (en) * | 2016-02-19 | 2016-07-13 | 上海电机学院 | Magnetic shielding device of transformer oil tank |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SHANDONG POWER EQUIPMENT MANUFACTURING CO., LTD. Free format text: FORMER NAME: SHANDONG POWER EQUIPMENT COMPANY Owner name: SHANDONG POWER EQUIPMENT CO., LTD. Free format text: FORMER NAME: SHANDONG POWER EQUIPMENT MANUFACTURING CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 250022 Shandong Province, Ji'nan city central machine West Road No. 3 Patentee after: SHANDONG POWER EQUIPMENT Co.,Ltd. Address before: 250022 Shandong Province, Ji'nan city central machine West Road No. 3 Patentee before: Shandong Power Equipment Co.,Ltd. Address after: 250022 Shandong Province, Ji'nan city central machine West Road No. 3 Patentee after: Shandong Power Equipment Co.,Ltd. Address before: 250022 Shandong Province, Ji'nan city central machine West Road No. 3 Patentee before: Shandong Power Equipment Factory |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100331 Termination date: 20141107 |
|
| EXPY | Termination of patent right or utility model |