CN106783095B - A kind of built-in magnetic shielding transformer device body pressing plate - Google Patents
A kind of built-in magnetic shielding transformer device body pressing plate Download PDFInfo
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- CN106783095B CN106783095B CN201710014840.7A CN201710014840A CN106783095B CN 106783095 B CN106783095 B CN 106783095B CN 201710014840 A CN201710014840 A CN 201710014840A CN 106783095 B CN106783095 B CN 106783095B
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- magnetic screen
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- top board
- device body
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/36—Electric or magnetic shields or screens
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F2027/348—Preventing eddy currents
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Regulation Of General Use Transformers (AREA)
Abstract
A kind of built-in magnetic shielding transformer device body pressing plate, belongs to transformer technology field, including top board, takeup type magnetic screen, lower platen and high-strength nylon bolt.Takeup type magnetic screen is built in pressing plate by the present invention, realize all standing to whole winding, cause winding overhang electromagnetic wire hot-spot because of the increase of horizontal leakage field for solving traditional structure magnetic screen, the shortcomings that accelerating insulation ag(e)ing and reducing transformer service life, while the installation dimension of transformer body pressing plate, fit dimension, electric property and mechanical performance with transformer body miscellaneous part are not influenced.
Description
Technical field
The invention belongs to transformer technology field, especially relates to a kind of built-in magnetic shielding transformer device body pressing plate.
Background technology
Transformer is the device for changing alternating voltage using electromagnetic induction principle, by purposes can be divided into power transformer and
Special transformer etc..With expanding economy and the continuous progress of science and technology, the continuous application of new material, new process, transformer is not
By there is huge raising from voltage class or capacity.With the increase of transformer capacity, the rated current of transformer
Increase therewith, during transformer station high-voltage side bus, winding will be by that will produce magnetic field after electric current, since the iron core of transformer is by cold-rolled orientation silicon
Steel disc is process, and has excellent magnetic property, so most of magnetic flux all circulates in the core, but also some magnetic
Cross the air gap all or transformer oil be transmitted on the hardwares such as transformer case, folder, thus induce vortex and
Increase transformer loss, with the increase of electric current, leakage magnetic flux caused loss on hardware is bigger, or even causes office
Portion's hardware overheat, so as to cause transformer oil chromatographic exceeded and because gasket crosses the failures such as heat ageing permeability.In order to drop
Low stray transformer flux leads to the loss produced on hardware and avoids hot-spot, and usual way is in oil in industry at present
Magnetic screen made of cold-rolled orientation silicon steel piece is used in increase on the hardwares such as case tank wall, folder, transformer in the process of running,
Leakage magnetic flux enters the hardware that magnetic screen is rather than directly into magnetic screen present position, because of cold-rolled orientation used in magnetic screen
Silicon steel sheet magnetic property is much better than the magnetic property of hardware steel plate materials, therefore the loss very little produced, will not produce
Raw hot-spot phenomenon.It is along axis of winding lineal layout, but since transformer is different under the leakage field theoretical case of transformer
There are factors such as the imbalances of ampere-turn distribution between winding, leakage field is caused to exist there are certain width to component, width to the leakage field of component
Width produces horizontal leakage field on transformer winding electromagnetic wire, and horizontal leakage field is greater than in winding in the density of winding overhang
Portion, this horizontal leakage field can produce certain eddy-current loss on electromagnetic wire, so that increase the loss of transformer, usual electromagnetic wire
Width is larger, and eddy-current loss caused by horizontal leakage field and the width of electromagnetic wire is square directly proportional, therefore laterally
In the windings, the eddy-current loss that particularly winding overhang produces is extremely considerable for leakage field.But due to high-power transformer generally use magnetic
Screening arrangement, the addition of magnetic screen, substantially guides leakage magnetic flux to enter magnetic screen, so as to reduce leakage magnetic flux in hardware
The loss of middle generation, but the addition of magnetic screen, because it is not located at the surface of winding or lower section, and magnetic screen is to leakage magnetic flux
Distribution play a guiding function, channeling direction at an angle, thus changes the direction of leakage field with leakage field direction,
The ratio of horizontal leakage field is increased, the horizontal eddy-current loss increase for causing leakage field to be produced in winding overhang electromagnetic wire.For spy
For high-power transformer, the addition of magnetic screen not only makes the increase of winding overhang electromagnetic wire transverse direction eddy-current loss, and main asks
Topic be winding upper end in transformer top, be high oil temperature area, the increase of eddy-current loss can cause winding overhang electromagnetic wire office
Portion overheats, and accelerates insulation ag(e)ing and reduces transformer service life.
A kind of new magnet shielding structure how is designed, is allowed to reduce eddy-current loss of the leakage field in hardware, and
It will not cause winding overhang electromagnetic wire hot-spot because of the increase of horizontal leakage field, accelerate insulation ag(e)ing and reduce transformer use
Service life.This is exactly the domestic and international key problem in technology point in design of transformer.
The content of the invention
The technical problems to be solved by the invention are：A kind of built-in magnetic shielding transformer device body pressing plate is provided, by magnetic screen
It is built in pressing plate, causes winding overhang electromagnetic wire part mistake because of the increase of horizontal leakage field for solving traditional structure magnetic screen
Heat, accelerate insulation ag(e)ing and the shortcomings that reduce transformer service life, while do not influence transformer body pressing plate installation dimension,
Fit dimension, electric property and mechanical performance with transformer body miscellaneous part.
A kind of built-in magnetic shielding transformer device body pressing plate, including top board, takeup type magnetic screen, lower platen and high intensity Buddhist nun
Imperial bolt,
The top board is cirque structure, and grounding copper band perforate and nylon bolt perforate, upper pressure are provided with top board
The inner annular edge of plate is provided with low pressure winding and lifts one's head gap, and the lower part of top board is provided with oil guide groove；Set in the oil guide groove
There is equally distributed oil guiding hole, the diameter center line of oil guide groove is consistent with the center line of takeup type magnetic screen；
The lower platen is cirque structure, and the top of lower platen is provided with magnetic screen fixing groove, the inner ring side of lower platen
Edge is provided with low pressure winding and lifts one's head gap, nylon bolt threaded hole is provided with lower platen, lower platen passes through high-strength nylon spiral shell
Bolt is fixedly connected with top board；The internal diameter size of the magnetic screen fixing groove is smaller 1mm than takeup type magnetic screen internal diameter size, magnetic cup
Cover that the outer diameter of fixing groove is bigger 1mm than the outer diameter of takeup type magnetic screen, the depth ratio takeup type magnetic of magnetic screen fixing groove
The big 1mm of thickness of shielding；
The takeup type magnetic screen includes grounding copper band, winding silicon steel sheet body, Nomex promises U.S.'s paper and epoxy resin cure
Layer, the top of takeup type magnetic screen are connected with top board, and the lower part of takeup type magnetic screen passes through magnetic screen fixing groove and lower platen
Connection；The top of the grounding copper band is set through grounding copper with the top for being located at top board after perforate, the top of grounding copper band
There is the circular hole of a diameter of 12mm, the lower part of grounding copper band is welded by soldering and winding silicon steel sheet body；The winding silicon steel sheet body
Formed for 20mm~40mm wide cold-rolled orientation silicon steels piece winding, wind outer radius of the internal diameter size than low pressure winding of silicon steel sheet body
The big 30mm of size, the outer diameter of winding silicon steel sheet body is smaller 80mm than the outer diameter of top board, winds the outside of silicon steel sheet body
It is provided with the epoxy resin cure layer of epoxy resin cure formation；Nomex promises U.S. paper bag is rolled in epoxy resin cure layer
It is exterior；
The high-strength nylon bolt is connected after passing through nylon bolt perforate with nylon bolt threaded hole, high-strength nylon spiral shell
Bolt is provided with elongated exhausting-gas hole in centre along its length.
The thickness of the top board is 10mm~20mm.
The thickness of the lower platen is 40mm~80mm.
The grounding copper band is thick for 0.3mm, the copper strips of 40mm wide.
The spiro rod length of the high-strength nylon bolt is bigger 15mm than the thickness value of top board.
The oil guiding hole is the circular hole of diameter 8mm, and the spacing between two neighboring oil guiding hole is 100mm~120mm.
The width of the oil guide groove is 12mm, depth 5mm, the inner ring concentric of oil guide groove and lower platen.
The depth of thread of the nylon bolt threaded hole is 20mm.
The bore dia of the elongated exhausting-gas hole is 6mm.
By above-mentioned designing scheme, the present invention can bring following beneficial effect：
Takeup type magnetic screen in the present invention is placed in inside device body pressing plate, reduces what leakage field produced on hardware
Eddy-current loss, and the installation dimension, electric property and mechanical performance of transformer body pressing plate are not influenced.At the same time because of takeup type magnetic cup
Cover positioned at the top of transformer winding, reduce the eddy-current loss that leakage field produces on hardware, avoid traditional structure
While magnetic screen aggravation transverse direction leakage field, leakage field is attracted to device body, avoids the bending of leakage field, reduces horizontal leakage field
Density, avoid traditional structure magnetic screen causes winding overhang electromagnetic wire hot-spot because of the increase of horizontal leakage field, accelerates exhausted
Edge aging and the shortcomings that reduce transformer service life.
Takeup type magnetic screen in the present invention can realize all standing to whole winding, and block is pressed compared with traditional structure magnetic screen
Distribution arrangement improves shield effectiveness；Takeup type magnetic screen for 20mm~40mm wide cold-rolled orientation silicon steel pieces band continuously winding and
Into technique is simple, and work efficiency is high；Takeup type magnetic screen is continuous coiling, reduces cutting operation compared with traditional structure magnetic screen,
Influence of the shearing to silicon steel sheet magnetic property is avoided, is conducive to the reduction of stray loss, silicon steel sheet thickness direction is towards leakage field
Direction, eddy-current loss are low；It can realize the complete shielding to leakage field, reduce the leakage into the hardware such as fuel tank and folder
Magnetic, customer service traditional structure magnetic screen cannot accomplish the complete shielding to coil leakage field, and there are respective regions shielding is incomplete
Shortcoming；Each pressing plate only needs a ground connection, thus earthed system technique is simple, improves reliability, overcomes traditional structure magnetic
Shield and polylith magnetic screen is arranged on a pressing plate, every piece of magnetic screen is required to be grounded, and earthed system is complicated, is grounded quantity
The defects of increase also reduces reliability.
Brief description of the drawings
Below in conjunction with the drawings and specific embodiments, the present invention is further illustrated：
Fig. 1 is a kind of structure diagram of built-in magnetic shielding transformer device body pressing plate of the present invention.
Fig. 2 is a kind of overlooking the structure diagram of built-in magnetic shielding transformer device body pressing plate of the present invention.
Fig. 3 is the structure diagram of top board in a kind of built-in magnetic shielding transformer device body pressing plate of the present invention.
Fig. 4 is the overlooking the structure diagram of top board in a kind of built-in magnetic shielding transformer device body pressing plate of the present invention.
Fig. 5 is the structure diagram of takeup type magnetic screen in a kind of built-in magnetic shielding transformer device body pressing plate of the present invention.
Fig. 6 is the plan structure signal of takeup type magnetic screen in a kind of built-in magnetic shielding transformer device body pressing plate of the present invention
Figure.
Fig. 7 is the structure diagram of lower platen in a kind of built-in magnetic shielding transformer device body pressing plate of the present invention.
Fig. 8 is the overlooking the structure diagram of lower platen in a kind of built-in magnetic shielding transformer device body pressing plate of the present invention.
Fig. 9 is the structure diagram of high-strength nylon bolt in a kind of built-in magnetic shielding transformer device body pressing plate of the present invention.
In figure, 1- top boards, the magnetic screen of 2- takeup types, 3- lower platens, 4- grounding coppers band, 5- high-strength nylons bolt, 6-
Grounding copper band perforate, 7- low pressure windings are lifted one's head gap, 8- oil guiding holes, 9- oil guide grooves, the perforate of 10- nylon bolts, 11- winding silicon steel
Sheet body, 12-Nomex promises U.S. paper, 13- epoxy resin cures layer, 14- magnetic screens fixing groove, 15- nylon bolts threaded hole, 16- lead to
Long exhausting-gas hole.
Embodiment
As shown in the figure, a kind of built-in magnetic shielding transformer device body pressing plate, including top board 1, takeup type magnetic screen 2, pushing
Plate 3 and high-strength nylon bolt 5 form.The takeup type magnetic screen is welded with grounding copper band 4.The top board 1 and lower platen 3 are opened
There is low pressure winding to lift one's head gap 7.
The top board 1, including the perforate 6 of grounding copper band, oil guiding hole 8, oil guide groove 9, low pressure winding are lifted one's head gap 7 and nylon
Bolt aperture 10.Top board 1 is circular ring structure, inside/outside diameter size with traditional structure transformer device body pressing plate, thickness for 10mm~
20mm, its material are lamination wood, laminated paper board or hot pressing polyester resin plastic laminates.Top board is furnished with grounding copper band perforate 6,
Drawn for the grounding copper band 4 of takeup type magnetic screen 2；Oil guiding hole 8 and oil guide groove 9 are provided with top board 1, for takeup type magnetic cup
2 formation heat transmission oil flow channels use is covered, oil guiding hole is the circular hole of diameter 8mm, and spacing is 100mm~120mm, positioned at oil guide groove 9
Top, oil guide groove 9 are located at 1 lower part of top board, width 12mm, depth 5mm, 9 diameter center line of oil guide groove and takeup type magnetic
It is consistent to shield 2 center lines；Top board 1 is lifted one's head gap 7 equipped with low pressure winding, is drawn for transformer low voltage Winding tap；Upper pressure
Plate 1 is furnished with nylon bolt perforate 10, for using the connection of high-strength nylon bolt 5 to use between top board 1 and lower platen 3.
The takeup type magnetic screen 2, including grounding copper band 4, winding silicon steel sheet body 11, Nomex promises U.S. paper 12 and asphalt mixtures modified by epoxy resin
Fat cured layer 13.Grounding copper band 4 is thick for 0.3mm, and 40mm wide copper strips, 4 top of grounding copper band is provided with a diameter of 12mm circular holes, is grounded
4 lower part of copper strips uses soldering and welding with winding silicon steel sheet body 11；It is 20mm~40mm wide cold-rolled orientation silicon to wind silicon steel sheet body 11
Steel disc winding forms, its internal diameter size adds 30mm for low pressure winding outer radial dimension, and outer diameter subtracts for pressing plate outer radial dimension
80mm, because silicon steel sheet thickness side is towards stray field, therefore can reduce the eddy-current loss produced in silicon steel sheet；Wind silicon steel sheet body
After 11 windings are completed and weld grounding copper band 4, cured using epoxy resin cure layer 13, finally with Nomex promises U.S. paper
12Nomex U.S.s promise paper half lap wraps up 2 layers.
The lower platen 3, including takeup type magnetic screen fixing groove 14, low pressure winding are lifted one's head gap 7 and nylon bolt screw thread
Hole 15.Lower platen 3 is circular ring structure, and the same traditional structure transformer device body pressing plate of inside/outside diameter size, thickness is 40mm~80mm, its
Material is lamination wood, laminated paper board or hot pressing polyester resin plastic laminates.Lower platen 3 is furnished with magnetic screen fixing groove 14, is formed
2 installation space of takeup type magnetic screen, 14 internal diameter size of magnetic screen fixing groove subtract 1mm, outside diameter for 2 internal diameter size of takeup type magnetic screen
Size adds 1mm for 2 outer diameter of takeup type magnetic screen, and depth adds 1mm for 2 thickness of takeup type magnetic screen；Lower platen is furnished with
Low pressure winding is lifted one's head gap 7, is drawn for transformer low voltage Winding tap；Lower platen 3 is furnished with nylon bolt threaded hole 15, screw thread
Depth is 20mm, for using the connection of nylon bolt 5 to use between top board 1 and lower platen 3.
The high-strength nylon bolt 5, is high-strength nylon material, for top board 1, takeup type magnetic screen 2 and is pushed
Plate 3 connects top board 1 and lower platen 3 after the completion of combining.5 specification of high-strength nylon bolt is M24 bolts, strength nylon bolt 5
Spiro rod length it is bigger 15mm than the thickness value of top board 1.High-strength nylon bolt 5 is provided with elongated exhausting-gas hole 16, and position is along length
Direction centre, bore dia 6mm, for emptying thread portions gap air, avoid because residual air and caused by electrically
Hydraulic performance decline.
Claims (9)
1. a kind of built-in magnetic shielding transformer device body pressing plate, it is characterized in that：Including top board (1), takeup type magnetic screen (2), under
Pressing plate (3) and high-strength nylon bolt (5),
The top board (1) is cirque structure, and grounding copper band perforate (6) and nylon bolt perforate are provided with top board (1)
(10), the inner annular edge of top board (1) is provided with low pressure winding and lifts one's head gap (7), and the lower part of top board (1) is provided with oil guide groove
(9)；Equally distributed oil guiding hole (8), diameter center line and the takeup type magnetic of oil guide groove (9) are provided with the oil guide groove (9)
The center line for shielding (2) is consistent；
The lower platen (3) is cirque structure, and the top of lower platen (3) is provided with magnetic screen fixing groove (14), lower platen (3)
Inner annular edge be provided with low pressure winding and lift one's head gap (7), nylon bolt threaded hole (15) is provided with lower platen (3), is pushed
Plate (3) is fixedly connected by high-strength nylon bolt (5) with top board (1)；The internal diameter size of the magnetic screen fixing groove (14)
Smaller 1mm than takeup type magnetic screen (2) internal diameter size, the outer diameter of magnetic screen fixing groove (14) is than takeup type magnetic screen (2)
The big 1mm of outer diameter, the big 1mm of thickness of the depth ratio takeup type magnetic screen (2) of magnetic screen fixing groove (14)；
The takeup type magnetic screen (2) includes grounding copper band (4), winding silicon steel sheet body (11), Nomex promises U.S. paper (12) and epoxy
Resin-cured layer (13), the top of takeup type magnetic screen (2) are connected with top board (1), and the lower part of takeup type magnetic screen (2) passes through
Magnetic screen fixing groove (14) is connected with lower platen (3)；The top of the grounding copper band (4) passes through grounding copper band perforate (6) position afterwards
In the top of top board (1), the top of grounding copper band (4) is provided with the circular hole of a diameter of 12mm, and the lower part of grounding copper band (4) leads to
Soldering is crossed to weld with winding silicon steel sheet body (11)；The winding silicon steel sheet body (11) is 20mm~40mm wide cold-rolled orientation silicon steel pieces
Winding forms, and the internal diameter size of winding silicon steel sheet body (11) is bigger 30mm than the outer radial dimension of low pressure winding, winds silicon steel sheet body
(11) outer diameter is smaller 80mm than the outer diameter of top board (1), and the outside of winding silicon steel sheet body (11) is provided with asphalt mixtures modified by epoxy resin
The epoxy resin cure layer that fat is formed by curing；Nomex promises U.S. paper (12) is wrapped in the outside of epoxy resin cure layer (13)；
The high-strength nylon bolt (5) is connected with nylon bolt threaded hole (15) afterwards through nylon bolt perforate (10), high-strength
Degree nylon bolt (5) is provided with elongated exhausting-gas hole (16) in centre along its length.
2. a kind of built-in magnetic shielding transformer device body pressing plate according to claim 1, it is characterized in that：The top board (1)
Thickness be 10mm~20mm.
3. a kind of built-in magnetic shielding transformer device body pressing plate according to claim 1, it is characterized in that：The lower platen (3)
Thickness be 40mm~80mm.
4. a kind of built-in magnetic shielding transformer device body pressing plate according to claim 1, it is characterized in that：The grounding copper band
(4) it is thick for 0.3mm, the copper strips of 40mm wide.
5. a kind of built-in magnetic shielding transformer device body pressing plate according to claim 1, it is characterized in that：The high-strength nylon
The spiro rod length of bolt (5) is bigger 15mm than the thickness value of top board (1).
6. a kind of built-in magnetic shielding transformer device body pressing plate according to claim 1, it is characterized in that：The oil guiding hole (8)
For the circular hole of diameter 8mm, the spacing between two neighboring oil guiding hole (8) is 100mm~120mm.
7. a kind of built-in magnetic shielding transformer device body pressing plate according to claim 1, it is characterized in that：The oil guide groove (9)
Width be 12mm, depth 5mm, oil guide groove (9) and the inner ring concentric of lower platen (3).
8. a kind of built-in magnetic shielding transformer device body pressing plate according to claim 1, it is characterized in that：The nylon bolt spiral shell
The depth of thread of pit (15) is 20mm.
9. a kind of built-in magnetic shielding transformer device body pressing plate according to claim 1, it is characterized in that：The elongated exhausting-gas hole
(16) bore dia is 6mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710014840.7A CN106783095B (en) | 2017-01-09 | 2017-01-09 | A kind of built-in magnetic shielding transformer device body pressing plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710014840.7A CN106783095B (en) | 2017-01-09 | 2017-01-09 | A kind of built-in magnetic shielding transformer device body pressing plate |
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| Publication Number | Publication Date |
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| CN106783095A CN106783095A (en) | 2017-05-31 |
| CN106783095B true CN106783095B (en) | 2018-04-24 |
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| CN201710014840.7A Active CN106783095B (en) | 2017-01-09 | 2017-01-09 | A kind of built-in magnetic shielding transformer device body pressing plate |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108735440A (en) * | 2018-07-18 | 2018-11-02 | 天威保变(合肥)变压器有限公司 | A kind of device body pressing plate increase oil guide groove |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201732662U (en) * | 2010-06-30 | 2011-02-02 | 特变电工沈阳变压器集团有限公司 | Magnetic shielding structure of transformer |
| CN103779054A (en) * | 2012-10-20 | 2014-05-07 | 郑州汉通电子科技有限公司 | Silicon steel magnetic shielding |
| CN206363869U (en) * | 2017-01-09 | 2017-07-28 | 成来电气科技有限公司 | A kind of built-in magnetic shielding transformer device body pressing plate |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3491380B2 (en) * | 1995-04-14 | 2004-01-26 | 株式会社明電舎 | Stationary guidance equipment |
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2017
- 2017-01-09 CN CN201710014840.7A patent/CN106783095B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201732662U (en) * | 2010-06-30 | 2011-02-02 | 特变电工沈阳变压器集团有限公司 | Magnetic shielding structure of transformer |
| CN103779054A (en) * | 2012-10-20 | 2014-05-07 | 郑州汉通电子科技有限公司 | Silicon steel magnetic shielding |
| CN206363869U (en) * | 2017-01-09 | 2017-07-28 | 成来电气科技有限公司 | A kind of built-in magnetic shielding transformer device body pressing plate |
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