CN103269575A - Compound type low-frequency magnetic field shield plate - Google Patents
Compound type low-frequency magnetic field shield plate Download PDFInfo
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- CN103269575A CN103269575A CN2013101665455A CN201310166545A CN103269575A CN 103269575 A CN103269575 A CN 103269575A CN 2013101665455 A CN2013101665455 A CN 2013101665455A CN 201310166545 A CN201310166545 A CN 201310166545A CN 103269575 A CN103269575 A CN 103269575A
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Abstract
The invention discloses a compound type low-frequency magnetic field shield plate. The compound type low-frequency magnetic field shield plate is used for shielding of magnetic fields of the surrounding environment of a transformer substation. The compound type low-frequency magnetic field shield plate is composed of a plurality of aluminum plates and a plurality of silicon steel sheets, wherein the aluminum plates are of a multilayer stacking structure, the silicon steel sheets are of a multilayer stacking structure, and the aluminum plates which are brick-shaped and are stacked in a multilayer mode are laid on the tops or at the bottoms of the silicon steel sheets which are stacked in a parallel and multilayer mode. According to the compound type low-frequency magnetic field shield plate, a main magnetic field source of the transformer substation can be shielded by proportional matching of the aluminum plates and the silicon steel sheets, and the strength of electromagnetic fields of the transformer substation can be reduced.
Description
Technical field
The present invention relates to a kind of magnetic field shielding plate, particularly relate to a kind of combined type low frequency magnetic field barricade.
Background technology
Magnetic field shielding refers to arrange in a space material of conductivity or magnetic conductivity, reduces magnetic field leads to another space from this space mode.This effect because of shielding material reduces the effect of magnetic field energy, is called screen effect.Usually magnetic field shielding uses metal material, can be divided into two kinds: 1, use high magnetic capacity material, make it away from the conductively-closed thing magnetic field guiding, reach shield effectiveness.But magnetic conductive material may have hysteresis effect to produce heating and magnetically saturated problem; 2, use the material of high perveance, utilize eddy current to produce anti-phase magnetic flux, reach shield effectiveness, but heat producing losses's problem may also be arranged.Therefore necessary careful selection shielding material, and do suitable setting, just can obtain best shield effectiveness.
Can think that generally stereotype can be used to the radiation-screening line, thus also should select for use stereotype to shield power frequency magnetic field, but all come for a short time because of electrical conductivity and the magnetic capacity of stereotype with respect to other shielding materials, be not suitable for shielding power frequency magnetic field on the contrary.
Aluminium and copper all are materials of high perveance, can utilize Faraday's law, produce anti-phase magnetic flux, to reduce magnetic field.Though the conductance of copper is better than aluminium, the weight of copper is 3.3 times of aluminium, and price is also many than aluminium costliness, therefore goes up relatively, and copper relatively is not suitable for as shielding material.
Summary of the invention
The problems referred to above in view of prior art exists the object of the present invention is to provide a kind of combined type low frequency magnetic field barricade, and it uses high perveance material and magnetic conductive material is made and be used for the source, magnetic field of shielding transformer station.
In order to achieve the above object, a kind of combined type low frequency magnetic field barricade provided by the invention, wherein, it is made up of a plurality of aluminium sheets and a plurality of silicon steel sheet, and described aluminium sheet is the multiple-level stack structure;
Described silicon steel sheet is the multiple-level stack structure; And
The described aluminium sheet of brick type multiple-level stack be layed in multiple-level stack arranged side by side described silicon steel sheet above or below.
As preferably, described aluminium sheet be laid to two-layer or two-layer more than.
As preferably, described silicon steel sheet is laid to multilayer.
As preferably, described aluminium sheet is of a size of two kinds of 244cm*122cm and 244cm*61cm.
As preferably, described silicon steel sheet is of a size of 100cm*90cm.
As preferably, the thickness of described aluminium sheet is 30cm.
As preferably, the thickness of described silicon steel sheet is 3cm.
Combined type low frequency magnetic field barricade of the present invention has more outstanding shield effectiveness than traditional shielding material, and in light weight, and low price, suits to apply on a large scale.
Description of drawings
Fig. 1 is set up in the perspective view that magnetic field produces the source for combined type low frequency magnetic field barricade of the present invention.
Fig. 2 is the vertical view of Fig. 1.
Fig. 3 is the end view of Fig. 1.
Fig. 4 is the stereogram that the brick shape of the aluminium sheet in the combined type low frequency magnetic field barricade of the present invention is piled up.
Fig. 5 is the stereogram that directly piles up side by side of the silicon steel sheet in the combined type low frequency magnetic field barricade of the present invention.
Fig. 6 is set up in the perspective view that magnetic field produces the embodiment 2 in source for combined type low frequency magnetic field barricade of the present invention.
Fig. 7 is the vertical view of Fig. 6.
Fig. 8 is the end view of Fig. 6.
Fig. 9 in the combined type low frequency magnetic field barricade of the present invention the stereogram that piles up of the brick shape of aluminium sheet.
The stereogram that Figure 10 directly piles up side by side for the silicon steel sheet in the combined type low frequency magnetic field barricade of the embodiment of the invention 2.
Figure 11 is layed in the schematic diagram of silicon steel sheet top for the aluminium sheet in the combined type low frequency magnetic field barricade of the embodiment of the invention 2.
Embodiment
Below in conjunction with accompanying drawing technical scheme of the present invention is further described in detail:
Embodiment 1:
As Fig. 1, Fig. 2 and shown in Figure 3, show that respectively combined type low frequency magnetic field barricade of the present invention is set up in schematic perspective view, vertical view and end view that magnetic field produces the source.Combined type low frequency magnetic field barricade of the present invention is layed in the periphery that a magnetic field produces the source, and the magnetic field that barricade shields one group of phase three-wire three formula electric current 5 produces the source.In this embodiment 1, phase three-wire three formula electric current 5 sizes be 100 amperes and phase place each differ from 120 degree, between the phase conductor of this phase three-wire three formula electric current 5 and phase conductor central point apart from 10cm, conductor length is 50cm, and the measuring route 1 among Fig. 1, measuring route 2 and measuring route 33 are 12cm apart from this barricade 4 all.
As shown in Figure 3, barricade 4 is aluminium sheet 7 and silicon steel sheet 8, and the compound mode of this barricade 4 is: down, wherein this aluminium sheet 7 is the mode of brick type multiple-level stack to aluminium sheet 7 at last and silicon steel sheet 8, and its thickness is 30cm, and piles up 2 layers; This silicon steel sheet 8 adopts directly the mode of multiple-level stack side by side, and its thickness is 3cm, and piles up 5 layers.
As shown in Figure 4, aluminium sheet 27 is of a size of 244cm*61cn; The upper strata is the permutation and combination of two aluminium sheets 27, and lower floor is the permutation and combination of an aluminium sheet 27 and two aluminium sheets 37.
As shown in Figure 5, each silicon steel sheet 28 is of a size of the 100cm*90 meter, and directly piles up to form five layers side by side.
Table 1 to table 6 shows in conjunction with the shielded metal plate 4 of aluminium sheet 7 and silicon steel sheet 8 magnetic flux distribution and the magnetic field shielding effect in measuring route 1, measuring route 22 and measuring route 33.By learning in the measurement data, better with the shield effectiveness of this silicon steel sheet 8 in conjunction with this aluminium sheet 7, and in the design of magnetic field shielding, more crisp silicon steel sheet 8 can be placed after the aluminium sheet 7, to reach the effect of this silicon steel sheet 8 of protection.'+' of " from the lead center " number is illustrated in the magnetic flux distribution of lead top in the form, and '-' number is illustrated in the magnetic flux distribution of lead below.
Table 1: in conjunction with aluminium sheet and silicon steel sheet experiment path one magnetic flux distribution (unit: mG)
| Position (cm) | Unshielded | Silicon steel sheet is following, and aluminium sheet is last | Silicon steel sheet is last, and aluminium sheet is following |
| -150 | 9.8 | 6.0 | 6.1 |
| -120 | 16 | 4.3 | 4.4 |
| -90 | 29.8 | 5.3 | 4.6 |
| -60 | 67.6 | 5.9 | 5.8 |
| -30 | 198.4 | 6.6 | 7.2 |
| 0 | 288 | 9.1 | 9.3 |
| +30 | 182.4 | 7.7 | 7.9 |
| +60 | 64.6 | 6.0 | 6.1 |
| +90 | 29 | 4.9 | 4.7 |
| +120 | 15.8 | 4.0 | 4.5 |
| +150 | 9.8 | 6.1 | 6.5 |
Table 2: in conjunction with aluminium sheet and silicon steel sheet experiment path one magnetic field shielding effect (unit: dB)
| From lead center (cm) | Silicon steel sheet is following, and aluminium sheet is last | Silicon steel sheet is last, and aluminium sheet is following |
| -150 | 4.26 | 4.12 |
| -120 | 11.41 | 11.21 |
| -90 | 15.00 | 16.23 |
| -60 | 21.18 | 21.33 |
| -30 | 29.56 | 28.80 |
| 0 | 30.01 | 29.82 |
| +30 | 27.49 | 27.27 |
| +60 | 20.64 | 20.50 |
| +90 | 15.44 | 15.81 |
| +120 | 11.93 | 10.91 |
| +150 | 4.12 | 3.57 |
Table 3: in conjunction with aluminium sheet and silicon steel sheet experiment path two magnetic flux distribution (units: mG)
| Position (cm) | Unshielded | Silicon steel sheet is following, and aluminium sheet is last | Silicon steel sheet is last, and aluminium sheet is following |
| -150 | 11.4 | 5.8 | 5.7 |
| -120 | 19 | 4.3 | 6.0 |
| -90 | 34.2 | 4.5 | 6.2 |
| -60 | 73.6 | 5.2 | 5.7 |
| -30 | 208 | 5.7 | 4.7 |
| 0 | 288 | 6.6 | 5.4 |
| +30 | 176 | 5.4 | 4.5 |
| +60 | 67 | 5.0 | 5.5 |
| +90 | 32.4 | 4.6 | 5.9 |
| +120 | 18.2 | 4.3 | 6.0 |
| +150 | 11.4 | 6.3 | 6.2 |
Table 4: in conjunction with aluminium sheet and silicon steel sheet experiment path two magnetic field shielding effect (units: dB)
| From lead center (cm) | Silicon steel sheet is following, and aluminium sheet is last | Silicon steel sheet is last, and aluminium sheet is following |
| -150 | 5.87 | 6.02 |
| -120 | 12.91 | 10.01 |
| -90 | 17.62 | 14.83 |
| -60 | 23.02 | 22.22 |
| -30 | 31.24 | 32.92 |
| 0 | 32.80 | 34.54 |
| +30 | 30.26 | 31.85 |
| +60 | 22.54 | 21.71 |
| +90 | 16.96 | 14.79 |
| +120 | 12.53 | 9.64 |
| +150 | 5.15 | 5.29 |
Table 5: in conjunction with aluminium sheet and silicon steel sheet experiment path three magnetic flux distribution (units: mG)
| Position (cm) | Unshielded | Silicon steel sheet is following, and aluminium sheet is last | Silicon steel sheet is last, and aluminium sheet is following |
| -150 | 12.2 | 8.9 | 7.3 |
| -120 | 19.8 | 6.2 | 11 |
| -90 | 35.2 | 8.1 | 13.4 |
| -60 | 73.4 | 13.4 | 17.8 |
| -30 | 198.4 | 19.4 | 22.8 |
| 0 | 284.8 | 22.2 | 25.4 |
| +30 | 176 | 18.6 | 22.4 |
| +60 | 68.8 | 12.6 | 16.2 |
| +90 | 33.6 | 8.2 | 11.8 |
| +120 | 19 | 6.8 | 9.2 |
| +150 | 12.2 | 10.2 | 8.4 |
Table 6: in conjunction with aluminium sheet and silicon steel sheet experiment path three magnetic field shielding effect (units: dB)
| From lead center (cm) | Silicon steel sheet is following, and aluminium sheet is last | Silicon steel sheet is last, and aluminium sheet is following |
| -150 | 2.74 | 4.46 |
| -120 | 10.09 | 5.11 |
| -90 | 12.76 | 8.39 |
| -60 | 14.77 | 12.31 |
| -30 | 20.19 | 18.79 |
| 0 | 22.16 | 20.99 |
| +30 | 19.52 | 17.91 |
| +60 | 14.74 | 12.56 |
| +90 | 12.25 | 9.09 |
| +120 | 8.92 | 6.30 |
| +150 | 1.56 | 3.24 |
Embodiment 2:
Fig. 6, Fig. 7 and Fig. 8 show that respectively the invention process produces schematic diagram, vertical view and the end view in source in another magnetic field.Combined type low frequency magnetic field barricade of the present invention, it adopts 18 two kinds of aluminium sheet 17, silicon steel sheets, and the compound mode of shielded metal plate 14 is that aluminium sheet 17 is descending at last and silicon steel sheet 18, produces the source with the magnetic field that shields one group of phase three-wire three formula electric current 15.
As shown in Figure 9, this aluminium sheet adopts the two-layer mode of piling up of brick type, the long * of the size of aluminium sheet 17 is wide to be: 500cm*244cm, the upper strata is arranged in a combination by four aluminium sheets 27, this aluminium sheet 27 is of a size of 244cm*122cm, lower floor is arranged in a combination by two aluminium sheets 27 and four aluminium sheets 28, and wherein this aluminium sheet 28 is of a size of 244cm*61cm, and each aluminium sheet 27,37 thickness are 30cm.
As shown in figure 10, this silicon steel sheet 18 adopts directly five layers of mode of piling up arranged side by side, and the long * of the size of silicon steel sheet 18 is wide to be: 450cm*300, and each layer is to be combined side by side by 15 silicon steel sheets 28, and this silicon steel sheet is of a size of 100*90cm, and thickness is 3cm.
As shown in figure 11, according to a preferred embodiment of the invention 2, shielding the metal material that the source that produces, magnetic field of this phase three-wire three formula electric current 15 adopts is aluminium sheet 17 and silicon steel sheet 18, and aluminium sheet 17 is layed in directly on five layers of silicon steel sheet that piles up 18 arranged side by side in the two-layer mode of piling up of brick type.
Above embodiment is exemplary embodiment of the present invention only, is not used in restriction the present invention, and protection scope of the present invention is defined by the claims.Those skilled in the art can make various modifications or be equal to replacement the present invention in essence of the present invention and protection range, this modification or be equal to replacement and also should be considered as dropping in protection scope of the present invention.
Claims (7)
1. a combined type low frequency magnetic field barricade is characterized in that, it is made up of a plurality of aluminium sheets and a plurality of silicon steel sheet, and described aluminium sheet is the multiple-level stack structure;
Described silicon steel sheet is the multiple-level stack structure; And
The described aluminium sheet of brick type multiple-level stack be layed in multiple-level stack arranged side by side described silicon steel sheet above or below.
2. combined type low frequency magnetic field barricade as claimed in claim 1 is characterized in that, described aluminium sheet be laid to two-layer or two-layer more than.
3. combined type low frequency magnetic field shielding material plate as claimed in claim 1 is characterized in that described silicon steel sheet is laid to multilayer.
4. combined type low frequency magnetic field barricade as claimed in claim 1 is characterized in that, described aluminium sheet is of a size of two kinds of 244cm*122cm and 244cm*61cm.
5. combined type low frequency magnetic field barricade as claimed in claim 1 is characterized in that described silicon steel sheet is of a size of 100cm*90cm.
6. combined type low frequency magnetic field barricade as claimed in claim 1 is characterized in that, the thickness of described aluminium sheet is 30cm.
7. combined type low frequency magnetic field barricade as claimed in claim 1 is characterized in that, the thickness of described silicon steel sheet is 3cm.
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| CN2013101665455A CN103269575A (en) | 2013-05-09 | 2013-05-09 | Compound type low-frequency magnetic field shield plate |
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| CN2013101665455A CN103269575A (en) | 2013-05-09 | 2013-05-09 | Compound type low-frequency magnetic field shield plate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110556959A (en) * | 2019-09-29 | 2019-12-10 | 长江勘测规划设计研究有限责任公司 | Novel electromagnetic shielding structure of giant water turbine generator in strong electromagnetic environment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200637479A (en) * | 2005-04-08 | 2006-10-16 | Taiwan Power Co Ltd | Method using a composite material to shield ultra low frequency magnetic fields |
| TW200637478A (en) * | 2005-04-08 | 2006-10-16 | Taiwan Power Co Ltd | Collocation method in ratios of materials to form a composite material used to shield ultra low frequency magnetic fields |
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- 2013-05-09 CN CN2013101665455A patent/CN103269575A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200637479A (en) * | 2005-04-08 | 2006-10-16 | Taiwan Power Co Ltd | Method using a composite material to shield ultra low frequency magnetic fields |
| TW200637478A (en) * | 2005-04-08 | 2006-10-16 | Taiwan Power Co Ltd | Collocation method in ratios of materials to form a composite material used to shield ultra low frequency magnetic fields |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110556959A (en) * | 2019-09-29 | 2019-12-10 | 长江勘测规划设计研究有限责任公司 | Novel electromagnetic shielding structure of giant water turbine generator in strong electromagnetic environment |
| CN110556959B (en) * | 2019-09-29 | 2021-09-10 | 长江勘测规划设计研究有限责任公司 | Electromagnetic shielding structure of giant water turbine generator in strong electromagnetic environment |
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Application publication date: 20130828 |