CN201829323U - Clamping piece magnetic shielding structure in transformer - Google Patents
Clamping piece magnetic shielding structure in transformer Download PDFInfo
- Publication number
- CN201829323U CN201829323U CN2010202241527U CN201020224152U CN201829323U CN 201829323 U CN201829323 U CN 201829323U CN 2010202241527 U CN2010202241527 U CN 2010202241527U CN 201020224152 U CN201020224152 U CN 201020224152U CN 201829323 U CN201829323 U CN 201829323U
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- magnetic shielding
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Abstract
The utility model relates to a clamping piece magnetic shielding structure in a transformer, the structure is arranged at the end part of a coil, auxiliary pressure plates are arranged in the gap between the coil and the iron core as well as the gap between the coil and the web plate of the clamping piece, magnetic shieldings are inserted on the auxiliary pressure plates; the magnetic shielding is a flat type one-piece structure by vertically placing and upgrading the silicon steel sheets along the horizontal direction; the length of the magnetic shielding is extended to the magnetic leakage hollow passage of the transformer body; the placing height of the magnetic shielding is 200-250mm away from the upper and the lower end parts of the coil; the magnetic shielding is copper shielding with round cornered edges. The structure in the utility model improves the present situation of the magnetic shielding in the prior art that the shielding effect is not obvious due to circulation demagnetizing and the distance between the magnetic shielding and the magnetic leakage is far, improving the performance index of transformers with high resistance and super capacity, therefore, the circulation loss in the nonmagnetic conductive material structural members inside the transformer is greatly reduced and the limit value of the local hot spot temperature rise is also greatly reduced, having positive meaning in saving raw material consumption and improving product competitiveness.
Description
Technical field
The utility model relates to a kind of transformer manufacturing technology, a kind of specifically folder magnet shielding structure that is applied in superhigh pressure, vast capacity or the high impedance autotransformer.
Background technology
For the transformer that utilizes the work of electromagnetic conversion principle, the growth that is directly proportional with transformer capacity, short-circuit impedance of the size of transformer leakage field density, the growth of transformer leakage flux will bring phenomenons such as increase of product load loss and local overheating, and will be very unfavorable to the operation of transformer long-term safety.May cause the problem of local overheating for fear of the leakage field of high impedance, ultra-large capacity transformer product, generally adopt high magnetic conductive material as shielding in the logical zone of concentrating of device body brow leakage, dredge leakage field and do not enter or enter as few as possible in the non-magnetic structural member, in the hope of reaching the purpose that reduces eddy current loss in the structural member, prevents local overheating.The magnet shielding structure that at present big capacity autotransformer adopts, effect is also apparent in view on the transformer of the single-phase 250MVA capacity of routine, on high impedance, vast capacity autotransformer, this magnetic screen just can not be satisfied the requirement that reduces supplementary load loss in the structural member and prevent local overheating.
By transformer body brow leakage and existing magnet shielding structure are analyzed, find that there is following problem in existing magnetic screen: 1. when leakage flux is crossed magnetic screen, will induce circulation, and hinder leakage field and enter the magnetic screen (see figure 1) more on the magnetic screen top layer; 2. because magnetic screen adopts segmentation L type to place and be directly fixed on the first-class factor of folder web, cause that magnetic screen and device body end distance is far away (sees Fig. 2 A～2C), make the magnetic screen of being adopted compile and dredge the indifferent of leakage field, the shielding action that is risen on high impedance, ultra-large capacity transformer is just not obvious.
The utility model content
Far away at magnetic screen that exists in the prior art and device body end distance, weak points such as magnetic screening action is not obvious, it is obvious that the technical problems to be solved in the utility model provides a kind of magnetic screening action, makes the folder magnet shielding structure that circulation loss in the inner non-magnet material structural member of device body reduces greatly.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is:
Folder magnet shielding structure in a kind of transformer of the utility model is installed on end winding, is provided with secondary pressing plate in the space between coil and iron core, folder web, is embedded with magnetic screen on secondary pressing plate.
The plate overall structure that the horizontal direction stack forms is vertically placed, prolonged to described magnetic screen for adopting silicon steel sheet; The length of described magnetic screen extends to the place, the empty road of leakage field of device body; Upper and lower two the end 200～250mm of height distance coil are placed in described magnetic screen; It is the copper shield of corners that the edge is adopted in described magnetic screen.
The utlity model has following beneficial effect and advantage:
1. improved traditional magnetic screen because circulation degaussing and magnetic screen are far away apart from leakage field, the unconspicuous present situation of shield effectiveness, the performance index of high impedance, ultra-large capacity transformer have been promoted, make the circulation loss in the inner non-magnet material structural member of device body reduce greatly, the hot localised points temperature limit also greatly reduces.
2. the utility model all has positive meaning to the consumption that saves material, raising product competitiveness aspect.
Description of drawings
Fig. 1 is a magnetic screen leakage flux inductance loop flow diagram in the prior art;
Fig. 2 A is the folder magnet shielding structure schematic diagram of transformer adopting in the prior art;
Fig. 2 B is that the A of Fig. 2 A is to view;
Fig. 2 C is that the B of Fig. 2 A is to view;
Fig. 3 is the utility model magnetic screen leakage flux inductance loop flow diagram;
Fig. 4 A is the utility model folder magnet shielding structure schematic diagram;
Fig. 4 B is that the A of Fig. 4 A is to view.
Embodiment
Shown in Fig. 3,4A, 4B, folder magnet shielding structure in the utility model transformer is applied in the transformer of ODFS-400000/500, be installed on coil 4 ends, be provided with secondary pressing plate 5 in the space between coil 4 and unshakable in one's determination 2, folder web 1, on secondary pressing plate 5, be embedded with magnetic screen 3.
The plate overall structure that the horizontal direction stack forms is vertically placed, prolonged to described magnetic screen 3 for adopting silicon steel sheet.The utility model is by changing magnetic screen stack direction, leakage field is entered in the magnetic screen perpendicular to the silicon steel sheet web direction, utilize the silicon steel sheet lamination insulation to hinder the appearance of circulation, with this demagnetizing effect that slackens circulation in the large tracts of land permeability magnetic material, make magnetic screen play the good effect of dredging leakage field.
With this structure technical difficult points problems of mechanical strength that is the moulding of silicon steel sheet stack, with reference to core type transformer lamination stack and fixed form, adopt the nonmagnetic steel plate to be welded into shaped as frame box structure (the nonmagnetic steel plate of this shaped as frame box structure is meant to be embedded in and makes magnetic screen 3 molding framework in the secondary pressing plate 5), lamination is overlayed in the frame, adopt technological measures such as welding, the colligation of no latitude band, guarantee the physical dimension of magnetic screen stack.Before the utility model is used, make the magnetic screen exemplar, making and the maximum machine power that may bear in service, applied voltage test is carried out in magnetic screen by transformer, test pressure is 2 times a maximum machine power.
Change magnet shielding structure, the length of magnetic screen 3 extends to the place, the empty road of leakage field of device body, makes that large tracts of land leakage field in the empty road of main leakage is in-plant to enter magnetic screen; Placement height distance coil 4 upper and lower two end 200～250mm of magnetic screen 3 under the prerequisite that guarantees electrical insulation properties, reduce the distance of magnetic screen and end winding; By adjusting magnetic leakage flux, can determine the magnetic screen area coverage flexibly, make the large tracts of land leakage field directly enter magnetic screen.
Change magnetic screen fixed form and placement location, magnetic screen is embedded secondary pressing plate fix, make magnetic screen in height more near coil leakage field main empty path; Adopt the measure of corners copper shield at magnetic screen 3 edges, its effect is the electrode shape that improves the magnetic screen edge, improve end winding to the electric insulation tolerance between the magnetic screen, make magnetic screen in height more near end winding, the utility model magnetic screen has been lacked 70mm to the more traditional magnetic screen of distance of end winding.
The place, the empty road of leakage field that the length of magnetic screen 3 extends to the device body by adjusting magnetic leakage flux, can determine the magnetic screen area coverage flexibly, makes the large tracts of land leakage field directly enter magnetic screen.
The application of the utility model magnet shielding structure, improved traditional magnetic screen because circulation degaussing and magnetic screen are far away apart from leakage field, the unconspicuous present situation of shield effectiveness, the performance index of high impedance, ultra-large capacity transformer have been promoted, make the circulation loss in the inner non-magnet material structural member of device body reduce greatly, the hot localised points temperature limit also greatly reduces.For the ODFS-400000/500 transformer in the present embodiment, to adopt before and after the novel magnetic screen, transformer load loss has reduced 40kW.
The utility model magnetic screen can be applicable on the big capacity autotransformer, to reducing the circulation loss in the non-magnet material structural member, avoids the local overheating aspect to have very significant effect.
Claims (5)
1. the folder magnet shielding structure in the transformer is installed on end winding, it is characterized in that: be provided with secondary pressing plate (5) in the space between coil (4) and (2) unshakable in one's determination, folder web (1), be embedded with magnetic screen (3) on secondary pressing plate (5).
2. by the folder magnet shielding structure in the described transformer of claim 1, it is characterized in that: the plate overall structure that the horizontal direction stack forms is vertically placed, prolonged to described magnetic screen (3) for adopting silicon steel sheet.
3. by the folder magnet shielding structure in the described transformer of claim 1, it is characterized in that: the length of described magnetic screen (3) extends to the place, the empty road of leakage field of device body.
4. by the folder magnet shielding structure in the described transformer of claim 1, it is characterized in that: upper and lower two the end 200～250mm of height distance coil (4) are placed in described magnetic screen (3).
5. by the folder magnet shielding structure in the described transformer of claim 1, it is characterized in that: it is the copper shield of corners that the edge is adopted in described magnetic screen (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202241527U CN201829323U (en) | 2010-06-12 | 2010-06-12 | Clamping piece magnetic shielding structure in transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202241527U CN201829323U (en) | 2010-06-12 | 2010-06-12 | Clamping piece magnetic shielding structure in transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201829323U true CN201829323U (en) | 2011-05-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202241527U Expired - Lifetime CN201829323U (en) | 2010-06-12 | 2010-06-12 | Clamping piece magnetic shielding structure in transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201829323U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105448482A (en) * | 2015-12-28 | 2016-03-30 | 保定天威保变电气股份有限公司 | Magnetic flux leakage connected type magnetic shielding structure among transformer core limbs and loss reducing method |
| CN105480031A (en) * | 2015-11-05 | 2016-04-13 | 湖北文理学院 | Displacement magnetic shielding type tire air pressure detecting device |
| CN107492441A (en) * | 2017-08-01 | 2017-12-19 | 正泰电气股份有限公司 | A kind of method and device for effectively reducing high-power transformer load loss |
| CN107516588A (en) * | 2016-06-17 | 2017-12-26 | 特变电工沈阳变压器集团有限公司 | A kind of paralleling reactor of extra-high voltage device body combination electricity, magnet shielding structure |
| CN110085403A (en) * | 2019-05-21 | 2019-08-02 | 保定天威保变电气股份有限公司 | A kind of transformer three-limb core end magnet shielding structure and its method for shielding |
-
2010
- 2010-06-12 CN CN2010202241527U patent/CN201829323U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105480031A (en) * | 2015-11-05 | 2016-04-13 | 湖北文理学院 | Displacement magnetic shielding type tire air pressure detecting device |
| CN105448482A (en) * | 2015-12-28 | 2016-03-30 | 保定天威保变电气股份有限公司 | Magnetic flux leakage connected type magnetic shielding structure among transformer core limbs and loss reducing method |
| CN107516588A (en) * | 2016-06-17 | 2017-12-26 | 特变电工沈阳变压器集团有限公司 | A kind of paralleling reactor of extra-high voltage device body combination electricity, magnet shielding structure |
| CN107492441A (en) * | 2017-08-01 | 2017-12-19 | 正泰电气股份有限公司 | A kind of method and device for effectively reducing high-power transformer load loss |
| CN110085403A (en) * | 2019-05-21 | 2019-08-02 | 保定天威保变电气股份有限公司 | A kind of transformer three-limb core end magnet shielding structure and its method for shielding |
| CN110085403B (en) * | 2019-05-21 | 2024-04-26 | 保定天威保变电气股份有限公司 | Magnetic shielding structure and magnetic shielding method for end part of three-post iron core of transformer |
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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 |
Granted publication date: 20110511 |
|
| CX01 | Expiry of patent term |