CN2836197Y - Active field magnetic shielded dry-type transformer - Google Patents

Abstract

The utility model discloses an active field magnetic shielded dry-type transformer of a power transformer. The electromagnetism leakage of an electromagnetism leakage field, which is generated because of continuous operation of the prior dry-type transformer, can transmit and irradiate to space in the form of electromagnetic waves, so the prior dry-type transformer is harmful for people and environment. The periphery of a transformer coil is provided with a magnetic shielded wall (6), one point of the shielded wall is effectively connected with the ground, the height of the magnetic shielded wall (6) is higher than that of the transformer coil, and the length and the width of the magnetic shielded wall (6) correspond to that of the transformer. Thus, the electromagnetism leakage of the electromagnetism leakage field is effectively limited in the transformer, the aim of fundamentally preventing and treating electromagnetic pollution is realized, influence for living organisms, air and apparatuses except the transformer can not be generated, and the harm for the people and the environment is reduced. The utility model has the advantages of low additional loss and small noises. The overexcitation ability of the transformer can not be limited under the condition of the load as 1.5 times as rated load of a date plate.

Description

Active field magnetic screen dry-type transformer

Affiliated field:

The utility model relates to a kind of power 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.

Dry-type transformer iron core and coil are not immersed in the iknsulating liquid, have do not fire, not quick-fried, volume is little, few safeguard and can go deep into advantage such as load center, is widely used in fields such as skyscraper, underground installation, airport, harbour, industrial and mining enterprises, power station, subway, marine drilling platform.Dry-type transformer is a power frequency intense radiation equipment, be power frequency alternating electromagnetism field source, its electromagnetic stray field electromagnetism leaks can be with form of electromagnetic wave to spatial transmission, radiation, when 50 cycles, about 60 millimeters of electromagnetic wave depth of penetration in copper, aluminium, the about 5000m of the depth of penetration in the soil of drying.The electromagnetism that the continuous operation coil stray field of transformer produces leaks and can living organism, air, instrument and equipment beyond the transformer be exerted an influence in the spatial transmission radiation, and people and environment are produced harm.

Transformer magazine 2003.40 (7)-1～3, the author opens long increase etc., autograph: " analysis of poured with epoxy resin dry-type transformer environmental protection characteristic "; Transformer magazine 2003.40 (7)-4～8, author's money is long-living, autograph: " the synthesized environmental protection characteristic of resin-cast type dry-type transformer "; Transformer magazine 2003.40 (8)-13～15; author Sang Huikai; autograph: " H level Nomex paper insulation dry-type transformer "; three pieces of articles are all from manufacturing and designing, moving; three links of final disposal have been analyzed the environmental protection characteristic of dry-type transformer; in three links, can not discharge poisonous or corrosive gas, and discarded object reclaims degradation treatment compliance with environmental protection requirements etc.

But move the influence of the electromagnetic pollution of generation to environment at dry-type transformer, and a kind of can the leakage electromagnetic stray field electromagnetism of appropriate design can be controlled at transformer inside, prevent that fundamentally the electromagnetic stray field electromagnetism from leaking propagation, the radiation of energy, reach the dry-type transformer of the purpose of control electromagnetic pollution, do not see any report of any publication and any information of public aspect so far.

Summary of the invention:

The purpose of this utility model is that a kind of active field magnetic screen dry-type transformer will be provided, it can leak the electromagnetic stray field electromagnetism effectively can be controlled at transformer inside, prevent that fundamentally the electromagnetic stray field electromagnetism from leaking propagation, the radiation of energy, alleviate electromagnetic pollution, reduce harm people and environment.

For achieving the above object, the utility model is the magnetic screen wall that front, back, the left side, the right side, setting all around and the transformer length and width around existing dry-type transformer coil are higher than coil height accordingly.The magnetic screen wall adopts the high-quality grain oriented silicon steel sheet to make, silicon steel sheet is cut into strip, place vertically, 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, and the edge of silicon steel sheet is towards stray field, and the coil leakage flux is along the silicon steel sheet edge, circulate along the grain-oriented direction that rolls of silicon steel sheet, magnetic resistance is minimum.Under 50 cycle power frequencies, the silicon steel sheet internal ratio that electromagnetic wave is very high at magnetic permeability, magnetic resistance is minimum 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 all ground strips are 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 propagation, the radiation 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, place vertically, the edge of magnetic links is towards stray field, the coil 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, and the magnetic screen wall is selected for use than low magnetic density, the close value of magnetic is in 8000～11000 Gausses, thereby supplementary load loss are low, noise is little.Leave the gap between coil and the magnetic screen wall, the gap determines that by the industrial frequency experiment magnitude of voltage and the lightning impulse test magnitude of voltage of different network system rated voltages network system voltage is when 3～110KV, and interstice coverage is at 40～850mm.Because the magnetic screen wall provides path for the coil leakage flux, can not make transformer leakage flux and main flux superposition that transformer overexcitation ability is restricted under 1.5 times of loads of the super nameplate rating of transformer.

The utility model particularly suitable high voltage, big electric current, jumbo dry-type transformer, transformer capacity is big, volume 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.The magnetic screen wall that is bolted together is seen the monoblock that is not a sealing on geometric figure, have the gap between every magnetic screen wall, but leakage flux is clamp-oned magnetic screen within the walls because of attempt effectively by the path of magnetic resistance minimum, and can not flow in the air.

Description of drawings:

Fig. 1 is a profile front view of the present utility model;

Fig. 2 is a profile left view of the present utility model;

Fig. 3 is that Fig. 2 is along A-A line cutaway view;

Fig. 4 is that Fig. 1 is along B-B line cutaway view;

Fig. 5 for the master of magnetic screen wall, bow, left three-view diagram;

Fig. 6 is a magnetic screen wall floor plan.

Specific embodiments:

Fig. 3, transformer shown in Figure 4 have the three-phase core type iron core 13 of 45 ° of full bias seams, are set with the non-low-voltage coil 11 of sealing on iron core 13 every phase stems, respectively one of non-packaging high-voltage coil 12.2 circular hole 3D are respectively opened at the low pressure lower clamping piece 9B of iron core lower yoke both sides and high pressure lower clamping piece 9A two ends, 2 circular hole 3D are respectively left at end slot steel 14 two ends, with low pressure lower clamping piece 9B, high pressure lower clamping piece 9A, the iron core lower yoke is clamped by end slot steel 14, folder hole 3D, end slot steel hole 3D, bolt 4D, nut 5D.The porose 3C in footing 8 two ends by the hole 3C on low pressure lower clamping piece 9B, the high pressure lower clamping piece 9A, with bolt 4C, nut 5C, is installed in high pressure lower clamping piece 9A to footing 8, on the low pressure lower clamping piece 9B.

The high pressure upper clamping piece 10A of iron core upper yoke both sides, low pressure upper clamping piece 10B respectively opens 2 circular hole 3D in two ends, 2 circular hole 3D are respectively left at end slot steel 14 two ends, with high pressure upper clamping piece 10A, low pressure upper clamping piece 10B, bolt 4D, nut 5D, the iron core upper yoke is clamped by end slot steel 14, folder hole 3D, end slot steel hole 3D.

Be provided with arm-tie in the every phase stem of iron core both sides, the arm-tie two ends are welded with tension nail 19, the tension nail 19 hole 3G that pass on the high and low pressure side folder from top to bottom, the annulus of tightening bolt 20 1 ends is enclosed within on the tension nail 19, tightening bolt 20 other ends pass high pressure upper clamping piece 10A, hole 3H on the low pressure upper clamping piece 10B, by the tension on arm-tie nail 19 high-pressure side folder from top to bottom, low-pressure side folder from top to bottom are coupled together separately, high and low pressure side upper clamping piece, low-voltage coil 11, high-tension coil 12, high and low pressure side lower clamping piece are axially strained along coil with tightening bolt 20, nut 5H.

The high-tension coil lead-out wire is welded on the high-voltage connection plate 15, and the low-voltage coil lead-out wire is welded on the low pressure terminal block 16, and zero phase lead-out wire is welded on the zero phase connection plate 17, and terminal block all is fixed on the high-low pressure folder from top to bottom with insulation support rod.

Fig. 1, Fig. 3, carriage shown in Figure 6 are by angle steel 1A, angle steel 1B, angle steel 1C, by corresponding hole 3J separately, connect fastening composition with bolt 4J, nut 5J.Front, back, the left side, the right side of the utility model shown in Figure 6 around transformer coil, setting all around are higher than coil and the corresponding magnetic cup wall 6 shown in Figure 5 of transformer length and width.In the middle of rectangle magnetic screen wall 6 shown in Figure 5 is strip high-quality grain oriented silicon steel sheet 61, and the width of silicon steel sheet 61 becomes the thickness of magnetic screen wall 6 at this moment, and several very thin silicon steel sheets stack the width that together becomes the magnetic screen wall along thickness direction.Strip silicon steel sheet 61 both sides are strip insulation boards 63, and 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, nut 5B with screw rod 7A, silicon steel sheet 61, insulation board 63, steel plate bar 64 are fastenedly connected into magnetic screen wall 6 shown in Figure 5, the silicon steel sheet 61 in the magnetic screen this moment wall 6 insulate with steel plate bar 64, screw rod 7A.Place the ground strip 62 of the good copper strips of 1 very thin conduction as the magnetic screen wall at silicon steel sheet 61 near insulation board 63 places, ground strip 62 1 ends are opened a hole 3B, so that earthy.Magnetic screen wall 6 is selected for use than low magnetic density, and the close value of magnetic is 8000～11000 Gausses.

Angle steel 1A below the carriage goes up porose 3K, and porose 3C on the footing 8 with bolt 4K, nut 5K, is installed in the angle steel 1A below the carriage on the footing 8 by hole 3K, 3C, is welded with earth stud 21 on the footing 8.Be welded on position on carriage angle steel 1A, the angle steel 1B inwall, size and magnetic screen wall both sides insulation board 63, steel plate bar 64, on the corresponding support 2 of circular hole 3B on the extension of two ends circular hole 3A is arranged, with bolt 4A, nut 5A, by hole 3A, 3B magnetic screen wall 6 is fastened on carriage 1A, the 1B, and to make the magnetic screen wall be 40～850mm apart from the gap of transformer coil live part.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 carriage effective grounding.

Just constituted active field magnetic screen dry-type transformer by above-mentioned specific embodiments, and manufacturing process realizes simply, very easily.

The dry-type transformer of the utility model particularly suitable high voltage, big electric current, be not limited to above-mentioned three-phase core type iron core twin coil dry-type transformer, be equally applicable to tridimensional triangle iron core, single-phase, self coupling, many windings, non-excitation pressure adjustment, load tap-changing dry-type power transformer; Also be applicable to electric furnace, unsteady flow or other dry-type transformers.Make as long as around transformer coil, be provided with silicon steel sheet; place vertically; the silicon steel sheet edge is towards stray field; coil 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. active field magnetic screen dry-type transformer, mainly by a three-phase core type iron core, be set with the non-low-voltage coil of sealing on the every phase stem of iron core, each one of non-packaging high-voltage coil, use folder, footing, bolt, nut, the end slot steel, insulation support rod etc., connect fastening forming with mechanical mode, it is characterized in that: the front around dry-type transformer coil, the back, the left side, be provided with transformer long around the right side, wide corresponding, the magnetic screen wall (6) that is higher than coil height, magnetic screen wall (6) adopts the high-quality grain oriented silicon steel sheet to make, silicon steel sheet is selected for use than low magnetic density, silicon steel sheet is cut into strip, place vertically, 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 coil leakage flux circulates along the grain-oriented direction that rolls of silicon steel sheet along the edge of silicon steel sheet (61), the magnetic group 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, the corresponding with it carriage angle steel (1A) that is welded on, on the support (2) on angle steel (1B) inwall circular hole (3A) is arranged, with bolt (4A), nut (5A), by hole (3A), hole (3B) is fastened on carriage angle steel (1A) to magnetic screen wall (6), on the angle steel (1B), and make the magnetic screen wall leave the gap apart from the transformer coil live part, silicon steel sheet (61) in the magnetic screen wall (6) and steel plate bar (64), screw rod (7A) insulate, the ground strip (62) of every magnetic screen wall (6) is interconnected, hole (3B) by ground strip (62) one ends is communicated with support (2) with bolt (4A) in place, make all magnetic screen wall click-throughs cross the carriage effective grounding, transformer capacity is big, volume 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 dry-type transformer according to claim 1 is characterized in that: the close value of magnetic of magnetic screen wall (6) is 8000～11000 Gausses.

3. active field magnetic screen dry-type transformer according to claim 1 is characterized in that: magnetic screen wall (6) is 40～850mm apart from the gap of transformer coil live part.

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