CN2911903Y - Active field magnetic shielded oil immersed electrical furnace transformer - Google Patents
Active field magnetic shielded oil immersed electrical furnace transformer Download PDFInfo
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- CN2911903Y CN2911903Y CN 200620006287 CN200620006287U CN2911903Y CN 2911903 Y CN2911903 Y CN 2911903Y CN 200620006287 CN200620006287 CN 200620006287 CN 200620006287 U CN200620006287 U CN 200620006287U CN 2911903 Y CN2911903 Y CN 2911903Y
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- magnetic screen
- transformer
- screen wall
- fuel tank
- silicon steel
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Abstract
The utility model discloses an active magnetic shielding oil immersed furnace transformer. A magnetic shielding wall (6) is arranged corresponding to the length and the width of the transformer body and higher than a winding height between the transformer body winding and an oil tank (1), and make one point of the magnetic shielding wall is effectively grounded. In this way, the electromagnetic leakage field and electromagnetic leakage energy are effectively controlled inside the transformer, and the aim of preventing and treating electromagnetic pollution are achieved fundamentally, making the living organism, air, instrument and device outside the transformer uninfluenced, and hazard to human and the environment is greatly reduced. The oil tank (1) and the magnetic shielding wall (6) have no local overheating on the bodies, and have lower additional loss. In 1.2 times rated current, the overexcitation capacity of the transformer is not limited.
Description
Affiliated field:
The utility model relates to a kind of furnace transformer.
Background technology:
(second) power frequency intense radiation system in State Bureau of Environmental Protection's the 18th command issue on March 25th, 1997 " electromagnetic radiation environment protection management method " annex: 1, voltage send the power transformation system more than 100KV; 2, electric current is at the power frequency equipment of 100 peaces more than doubly; 3, light rail and main line electric railway.Advise that above-listed construction project should handle environmental protection and declare registration formalities before project verification, use above-listed electromagnetic radiation equipment before procuring equipment, to handle environmental protection and declare registration formalities.
Furnace transformer is a power frequency intense radiation equipment, is power frequency alternating electromagnetism field source, and its electromagnetism leaks can be with form of electromagnetic wave to spatial transmission, radiation.The electromagnetic pollution that the continuous operation of transformer produces exerts an influence to living organism, air, instrument and equipment beyond the transformer, and people and environment are produced harm.
In design of transformer with in making, there are a series of challenges such as stray field and local overheating.Over past ten years, the Transformer Winding leakage field distributes, local overheating and shielding problem are one of scientific research tasks of extensively carrying out in the domestic and international transformer manufacturing industry, and the U.S. once studied with synthetic materials such as plastics and replaces the metal fuel tank, was solving leakage field and local problems of excessive heat in various degree; In the magnetic screen of the local layout of oil tank of transformer has been the technology that generally adopts, and purpose is to make leakage flux not penetrate the fuel tank steel plate as far as possible, avoids producing in fuel tank big loss and local overheating.But can be controlled at transformer inside a kind of electromagnetic stray field electromagnetism can be leaked of appropriate design, prevent that fundamentally electromagnetic stray field, electromagnetism from leaking leaking of energy, reach the purpose furnace transformer of control electromagnetic pollution, do not see any report of publication and any information of public aspect so far.
In oil tank of transformer, adopt the magnetic screen technology, analyze from structure, generally be that the part is arranged in the Transformer Winding higher position of leakage flux field intensity on every side, it all is the mode that adopts the plane to lay, plate magnetic screen is fixed on the inner wall of oil tank, there is not the gap between magnetic screen and the fuel tank, and the manufacturing process complexity.Transformer magazine 1997.34 (1)-38～40, author Liu Fenghe, autograph: the combination technology that external transformer magnetic screen is introduced in fine digestion narrated in " transformer magnetic screen " literary composition, and obtained the example of good effect, its magnet shielding structure is plate, transformer magazine 2004.41 (11)-33～36, author Wu Jinhua, autograph: the failure cause that the transformer of Japanese Toshiba production analyzed in " the unusual analysis of a 500KV transformer chromatogram " literary composition is that the low-yield intermittent discharge of magnetic screen and tank surface loose contact generation causes, and the magnet shielding structure of displaying also is plate.
The transformer magnetic screen of above-mentioned two pieces of articles narration all is that the part is laid on the plate magnetic screen on the fuel tank, the both plane of silicon steel sheet and fuel tank plane parallel, and local the layout, though reducing the fuel tank supplementary load loss, prevent the fuel tank local overheating, it is tangible improving transformer service conditions effect, but its magnetic screen is plate, magnetic resistance is bigger, leakage flux can not flow through smoothly, cause some leakage fluxs and the leakage flux of not establishing the magnetic screen part to be superimposed to flow in the magnetic screen fuel tank in addition and produce supplementary load loss, some leakage fluxs leak and cause electromagnetic pollution in air.Because leakage flux is passed the silicon steel sheet plane, cause bigger eddy current loss in magnetic screen, and magnetic screen itself also can produce local overheating.Once loss ratio after on a kind of product plate magnetic screen being set occurs and do not establish big nearly 4 times of the loss of plate magnetic screen, the example that temperature rise is also much higher.73～74 pages of Shandong Electric Power Group technology the 3rd phases of calendar year 2001, author Su Yueqing etc., autograph: suggestion will note preventing the local overheating of magnetic screen itself in " improving the measure and the suggestion of 500KV transformer quality " literary composition.
Summary of the invention:
The purpose of this utility model is that a kind of active field magnetic screen oil immersion furnace transformer will be provided, it can leak the electromagnetic stray field electromagnetism effectively can be controlled at transformer inside, prevent that fundamentally the leakage of electromagnetic stray field electromagnetism from can leak, the control electromagnetic pollution, minimizing is to the harm of people and environment, and supplementary load loss are lower.
For achieving the above object, the utility model is to be provided with to be higher than winding height and the corresponding magnetic screen wall of transformer body length and width between front, back, the left side, the right side and fuel tank around the existing oil immersion furnace transformer device body winding.The magnetic screen wall adopts the high-quality grain oriented silicon steel sheet to make, silicon steel sheet is cut into strip, places vertically, the plane of silicon steel sheet is perpendicular to the fuel tank plane, the width of silicon steel sheet becomes the thickness of magnetic screen wall at this moment, several very thin silicon steel sheets stack the width that together becomes the magnetic screen wall along thickness direction, the silicon steel sheet edge is towards stray field, and the winding leakage flux circulates along the grain-oriented direction that rolls of silicon steel sheet along the edge of silicon steel sheet, and magnetic resistance is minimum.Under 50 cycle power frequencies, electromagnetic wave is very high at magnetic permeability, and the minimum silicon steel sheet internal ratio of magnetic resistance decays many soon in copper, aluminium, just stops fully in several millimeters.Be provided with the good ground strip of conduction in the silicon steel sheet of every magnetic screen wall, some effective groundings after the ground strip of all magnetic screen walls is connected together, so just effectively the electromagnetic stray field electromagnetism is leaked and to be controlled at transformer inside, prevent that fundamentally the electromagnetic stray field electromagnetism from leaking leaking of energy, reach the purpose of control electromagnetic pollution, it is not exerted an influence to living organism, air, instrument and equipment beyond the transformer, reduce harm people and environment.
Because the magnetic screen wall adopts the high-quality grain oriented silicon steel sheet to make, silicon steel sheet is cut into strip, places vertically, the plane of silicon steel sheet is perpendicular to the fuel tank plane, the width of silicon steel sheet becomes the thickness of magnetic screen wall at this moment, the edge of silicon steel sheet is towards stray field, the winding leakage flux circulates along the grain-oriented direction that rolls of silicon steel sheet along the edge of silicon steel sheet, magnetic resistance is minimum, the magnetic screen wall is selected for use than low magnetic density, the close value of magnetic is in 6000～9000 Gausses, supplementary load loss are low, noise is little, and itself can not produce local overheating the magnetic screen wall.
Leave the gap between transformer body winding and the magnetic screen wall, interstice coverage is at 20～400mm; Also leave the gap between magnetic screen wall and the fuel tank, interstice coverage is at 10～200mm.Utilize silicon steel sheet, gap, the different characteristic of fuel tank magnetic permeability, difference in the locus, leakage flux is because of attempting to enter magnetic screen effectively within the walls by the path of magnetic resistance minimum, and can not enter in the hardware such as fuel tank and produce supplementary load loss and cause the fuel tank local overheating, can not produce low-yield intermittent discharge yet.Under 1.2 times of rated current, transformer leakage flux and main flux are superimposed transformer overexcitation ability is restricted.
Can not hinder in the fuel tank being communicated with of dielectric oil in the dielectric oil and outer radiator of fuel tank or cooler, exchange, circulation owing to leave the gap between magnetic screen wall and the fuel tank, also not can because of in structural design, to consider dielectric in the fuel tank oily with fuel tank outside being communicated with of radiator or cooler dielectric oil, exchange, circulation influence the setting of magnetic screen wall and the globality of magnetic screen wall.
The utility model particularly suitable high voltage, big electric current, jumbo oil immersion furnace transformer.Transformer capacity is big, transformer body, and the fuel tank area is big, and the magnetic screen wall adopts splicing structure, makes several piece or tens of, and assembling combination is formed whole magnetic screen wall together.
Description of drawings:
Fig. 1 is external form master of the present utility model, bow, left three-view diagram;
Fig. 2 is the cutaway view of Fig. 1 vertical view along the A-A line;
Fig. 3 is the cutaway view of Fig. 1 front view along the B-B line;
Fig. 4 for the master of magnetic screen wall, bow, left three-view diagram.
Specific embodiments:
Fig. 2, shown in Figure 3, furnace transformer device body are set with respectively 1 of 11, winding of secondary winding 12 by the three-phase core type iron core 13 of 45 ° of full bias seams on iron core 13 every phase stems.The secondary side lower clamping piece 9B of iron core lower yoke both sides and primary side lower clamping piece 9A (not drawing among the figure), 2 circular hole 3D are respectively opened at two ends, with 4 folder screw rod 7B, nut 5C, with secondary side lower clamping piece 9B and primary side lower clamping piece 9A the iron core lower yoke is clamped by circular hole 3D.
Every two ends are welded with 8 two of the footing of bolt 4B, by hole 3C, nut 5D on secondary side lower clamping piece 9B, the primary side lower clamping piece 9A footing 8 are installed on primary side lower clamping piece 9A and the secondary side lower clamping piece 9B.
The primary side upper clamping piece 10A of iron core upper yoke both sides (does not draw among Fig. 2, draw among Fig. 3), secondary side upper clamping piece 10B two ends respectively open 2 circular hole 3D, with 4 folder screw rod 7B, nut 5C, with primary side upper clamping piece 10A, secondary side upper clamping piece 10B the iron core upper yoke is clamped by hole 3D.
On primary side lower clamping piece 9A, primary side upper clamping piece 10A, secondary side lower clamping piece 9B, secondary side upper clamping piece 10B, respectively open 8 hole 3E, once, secondary side each with 4 draw that screw rod 7C passes once, hole 3E on the secondary side folder from top to bottom, with nut 5E, once with secondary side folder from top to bottom handle be sleeved on the iron core stem once, secondary winding strains.Transformer internal organ main body like this: magnetic circuit part iron core, electric part winding, by folder, footing, folder screw rod, draw screw rod, nut to connect to be tightened to a global facility, transformer body with mechanical system.
At the bottom of the ripple tank wall in Fig. 2, Fig. 3 around the outside of rectangle ripple fuel tank 1 and the case of lower end thereof and the case of upper end be integrally welded along 1A.The utility model be around the front, back, the left side, the right side around the transformer body winding as shown in Figure 3 and be provided with between the fuel tank 1 and be higher than winding height and transformer body length and width magnetic screen wall 6 shown in Figure 4 accordingly, in Fig. 4, be the grain-oriented silicon steel sheet 61 of strip high-quality in the middle of the rectangle magnetic screen wall 6, the width of silicon steel sheet becomes the thickness of magnetic screen wall at this moment, and several very thin silicon steel sheets stack the width that together becomes magnetic screen wall 6 along thickness direction.Strip silicon steel sheet 61 both sides are strip insulation boards 63, strip insulation board two outsides are strip steel plate bars 64, on strip insulation board 63 and strip steel plate bar 64 two ends extensions, 2 circular hole 3B are arranged, strip silicon steel sheet 61, strip insulation board 63, strip steel plate bar 64 superpositions together, 3 circular hole 3F are arranged in central appropriate location, insulated tube 65 is housed in the 3F of hole, pass insulated tube 65 with screw rod 7A, with nut 5B silicon steel sheet 61, insulation board 63, steel plate bar 64 is fastenedly connected into rectangle magnetic screen wall 6 shown in Figure 4, silicon steel sheet 61 and steel plate bar 64 in the magnetic screen this moment wall 6, and screw rod 7A insulate.Place the ground strip 62 of the good copper strips of 1 very thin conduction as magnetic screen wall 6 near insulation board 63 places in silicon steel sheet 61, ground strip 62 1 ends are opened a hole 3B, so that earthy.The magnetic screen wall is selected for use than low magnetic density, and the close value of magnetic is 6000～9000 Gausses.
Be welded on around Fig. 2, the fuel tank shown in Figure 31 position on the inwall, size and rectangle magnetic screen wall both sides upper insulation plate 63, on the support 2 of the circular hole 3B correspondence on the steel plate bar 64 two ends extensions circular hole 3A is arranged, with bolt 4A, nut 5A, by circular hole 3A, 3B rectangle magnetic screen wall is fastened on the inwall around the fuel tank 1, and to make this rectangle magnetic screen wall 6 be 10～200mm apart from the gap of fuel tank 1 inwall.The ground strip 62 of every magnetic screen wall is interconnected, and the hole 3B by ground strip 62 1 ends is communicated with support 2 with bolt 4A at correct position, makes all magnetic screen wall click-throughs cross the fuel tank effective grounding, and the also available insulator of ground strip is drawn ground connection.
Transformer capacity is big, transformer body, and the fuel tank area is big, and the magnetic screen wall adopts splicing structure, makes several piece or tens of magnetic screen walls shown in Figure 4, and assembling combination is formed whole magnetic screen wall together.
By above-mentioned specific embodiments, just constituted active field magnetic screen oil-immersed type transformer, and manufacturing process is simple, very easily realize.Research and development the utility model product meets national environmental protection, energy-conservation industry direction, will bring significant social, economic benefit.
The oil immersion furnace transformer of the utility model particularly suitable high voltage, big electric current, be not limited to above-mentioned oil immersion furnace transformer, be equally applicable to not have the electronic pressure regulation of excitation, on-load voltage regulation, have the oil immersion furnace transformer of series reactor or compensation circuit current limiting reactor in the fuel tank.Make as long as be provided with silicon steel sheet around the transformer body winding and between the fuel tank; the silicon steel sheet plane perpendicular to the fuel tank plane, place vertically; the silicon steel sheet edge is towards stray field; winding leakage flux circulating direction and the grain-oriented magnetic screen that rolls consistent endless track shape, pie or other suitable shapes of direction of silicon steel sheet, these conversion all drop within the protection range of the present utility model.
Claims (3)
1, a kind of active field magnetic screen oil immersion furnace transformer, mainly by fuel tank, conducting rod, insulating porcelain bushing, dielectric oil, transformer body is formed, transformer body is then by a three-phase core type iron core (13), be set with secondary winding (11) on the every phase stem of iron core, a winding (12) is used folder, screw rod, nut, footing connects fastening forming to the iron core winding, it is characterized in that: the front around the transformer body winding, the back, the left side, be provided with around the right side and between the fuel tank (1) and be higher than winding height and transformer height, wide corresponding magnetic screen wall (6), leave the gap between device body and the magnetic screen wall (6), magnetic screen wall (6) adopts the high-quality grain oriented silicon steel sheet to make, select for use than low magnetic density, silicon steel sheet is cut into strip, place vertically, the plane of silicon steel sheet (61) is perpendicular to the fuel tank plane, the width of silicon steel sheet this moment (61) becomes the thickness of magnetic screen wall (6), several very thin silicon steel sheets stack the width that together becomes magnetic screen wall (6) along thickness direction, the edge of silicon steel sheet (61) is towards stray field, the winding leakage flux circulates along the grain-oriented direction that rolls of silicon steel sheet along the edge of silicon steel sheet (61), magnetic resistance is minimum, the both sides upper insulation plate (63) of magnetic screen wall (6), circular hole (3B) on the extension of steel plate bar (64) two ends, on the corresponding with it support (2) that is welded on fuel tank (1) inwall circular hole (3A) is arranged, with bolt (4A), nut (5A), by circular hole (3A), circular hole (3B) is fastened on magnetic screen wall (6) on fuel tank (1) inwall all around, and make between magnetic screen wall (6) and fuel tank (1) inwall and leave the gap, silicon steel sheet (61) in the magnetic screen wall (6) and steel plate bar (64), screw rod (7A) insulate, the ground strip of every magnetic screen wall (62) is interconnected, be communicated with support (2) on being welded on fuel tank (1) with bolt (4A) in the hole (3B) of correct position by ground strip (62) one ends, make all magnetic screen wall click-throughs cross fuel tank (1) effective grounding, the also available insulator of ground strip (62) is drawn ground connection, transformer capacity is big, the device body, the fuel tank area is big, magnetic screen wall employing splicing structure is made several piece or tens of assembling combination are formed whole magnetic screen wall together.
2, active field magnetic screen oil immersion furnace transformer according to claim 1, it is characterized in that: the close value of magnetic of magnetic screen wall (6) is 6000～9000 Gausses.
3, active field magnetic screen oil immersion furnace transformer according to claim 1, it is characterized in that: magnetic screen wall (6) is 10～200mm apart from the gap of fuel tank (1) inwall, magnetic screen wall (6) is 20～400mm apart from the gap of transformer body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620006287 CN2911903Y (en) | 2006-02-23 | 2006-02-23 | Active field magnetic shielded oil immersed electrical furnace transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620006287 CN2911903Y (en) | 2006-02-23 | 2006-02-23 | Active field magnetic shielded oil immersed electrical furnace transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2911903Y true CN2911903Y (en) | 2007-06-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620006287 Expired - Fee Related CN2911903Y (en) | 2006-02-23 | 2006-02-23 | Active field magnetic shielded oil immersed electrical furnace transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2911903Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106571210A (en) * | 2015-10-09 | 2017-04-19 | 特变电工沈阳变压器集团有限公司 | 110kV transformer |
| CN109599256A (en) * | 2019-01-18 | 2019-04-09 | 吴江变压器有限公司 | A kind of low magnetic resistance folder magnetic screen |
| CN112259329A (en) * | 2020-10-17 | 2021-01-22 | 国网山东省电力公司淄博供电公司 | Transformer core ground lead structure |
-
2006
- 2006-02-23 CN CN 200620006287 patent/CN2911903Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106571210A (en) * | 2015-10-09 | 2017-04-19 | 特变电工沈阳变压器集团有限公司 | 110kV transformer |
| CN106571210B (en) * | 2015-10-09 | 2018-10-12 | 特变电工沈阳变压器集团有限公司 | A kind of 110kV transformers |
| CN109599256A (en) * | 2019-01-18 | 2019-04-09 | 吴江变压器有限公司 | A kind of low magnetic resistance folder magnetic screen |
| CN112259329A (en) * | 2020-10-17 | 2021-01-22 | 国网山东省电力公司淄博供电公司 | Transformer core ground lead structure |
| CN112259329B (en) * | 2020-10-17 | 2022-09-30 | 国网山东省电力公司淄博供电公司 | Transformer core grounding lead structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070613 Termination date: 20100223 |