CN107135636B - A kind of square section metallic shield slot design method shielding ultra low yield point steel - Google Patents
A kind of square section metallic shield slot design method shielding ultra low yield point steel Download PDFInfo
- Publication number
- CN107135636B CN107135636B CN201710333857.9A CN201710333857A CN107135636B CN 107135636 B CN107135636 B CN 107135636B CN 201710333857 A CN201710333857 A CN 201710333857A CN 107135636 B CN107135636 B CN 107135636B
- Authority
- CN
- China
- Prior art keywords
- metallic shield
- yield point
- ultra low
- low yield
- point steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0007—Casings
- H05K9/0049—Casings being metallic containers
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0098—Shielding materials for shielding electrical cables
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The present invention relates to a kind of square section metallic shield slot design methods for shielding ultra low yield point steel, square section metallic shield slot is equivalent to the circular section metallic shield pipe of the perimeters such as same material by this method, simplify the ultra low yield point steel shielding rate for estimating the square section metallic shield slot using the ultra low yield point steel shielding rate of axial symmetry shielded-plate tube, obtains the material and size for meeting the square section metallic shield slot of setting ultra low yield point steel shielding rate.Compared with prior art, the present invention has many advantages, such as to improve square section shielding trench design efficiency, and the deviation between the practical shielding rate of metallic shield slot and design shielding rate can be made to reach within 5%.
Description
Technical field
The present invention relates to ultra low yield point steel shield technology fields, more particularly, to a kind of square for shielding ultra low yield point steel
Cross section metal shielding trench design method.
Background technique
Ultra low yield point steel refers to that frequency is in the alternating magnetic field of 3Hz~300Hz range, is prevalent in and is loaded with very low frequencies friendship
Around the route or facility of galvanic electricity stream, for example, magnetic field power frequency (50Hz or 60Hz) around exchange high-low voltage transmission-distribution line road.With
Sensitive electronic equipment it is universal, often there is the occasion become, the ultra low yield point steel level around distribution line needs to control, i.e.,
Need the ultra low yield point steel around shielded line.The design of the metal tube shield of axisymmetric shape has simplified method, that is, shields
The calculating of efficiency has simplified formula can be evaluated whether.In Practical Project, distribution line is passed through frequently with metal raceway system of laying, this
Metal raceway itself has shielding action to ultra low yield point steel, be designed into shielding trench can play cabling or bus bar and
Shield the double action of ultra low yield point steel.And the design of the metallic channel shielding of non-axisymmetric shape is then needed using numerical value calculating side
Method realizes that this is extremely inconvenient in engineer application by Numerical Calculation of Electromagnetic Fields software.
Summary of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of screening electrode low-frequency magnetics
The square section metallic shield slot design method of field.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of square section metallic shield slot design method shielding ultra low yield point steel, for shielding ultra low yield point steel
Square section metallic shield slot is equivalent to the perimeters such as same material by the convenient design of square section metallic shield slot, this method
Circular section metallic shield pipe, simplified using the ultra low yield point steel shielding rate of axial symmetry shielded-plate tube and estimate square section gold
Belong to the ultra low yield point steel shielding rate of shielding trench, obtains the square section metallic shield slot for meeting setting ultra low yield point steel shielding rate
Material and size.
Method includes the following steps:
A setting ultra low yield point steel shielding rate S) is obtainedt；
B) initialization square section metal is required according to by the arrangement states in shielding ultra low yield point steel source and strength dielectric
The material and size of shielding trench；
C) step B) the square section metallic shield slot obtained is equivalent to the circular section metal screen of the perimeters such as same material
Cover pipe；
D the ultra low yield point steel shielding rate S ' of the circular section metallic shield pipe is calculated) with ultra low yield point steel shielding rate S '
Ultra low yield point steel equivalent shield rate S as the square section metallic shield slot；
E) judge whether the ultra low yield point steel equivalent shield rate S meets S≤St, if so, save current material and
Size, design terminate, if it is not, after then changing material and the size of square section metallic shield slot, return step C).
The size includes the side length of square section and the thickness of metallic shield slot.
The step D) in, ultra low yield point steel equivalent shield rate S, which simplifies, to be calculated are as follows:
In formula, intermediate parameters K, k are respectively defined as:Wherein, δ is the depth of penetration,R is the radius of circular section metallic shield pipe, and t is the thickness of circular section metallic shield pipe, and f is frequency, and μ is magnetic
Conductance, σ are conductivity.
The step E) in, the material and size for changing square section metallic shield slot specifically include in following measures
It is one or more: to increase the thickness of metallic shield slot, increase the side length of square section and select the material of higher relative permeability
Material.
The step B) in, it include cable, conducting wire or bus by shielding ultra low yield point steel source.
Compared with prior art, the invention has the following advantages:
(1) square section metallic shield slot is equivalent to the circular section metallic shield of the perimeters such as same material by the method for the present invention
Pipe estimates that its ultra low yield point steel shielding rate easily using the shielding rate reduced mechanical model of axial symmetry shielded-plate tube,
The design for avoiding square section shielding trench needs to design using numerical computation method by Numerical Calculation of Electromagnetic Fields software
Trouble, improve engineering design efficiency.
(2) the method for the present invention is suitable for applying in practice in engineering, the practical shielding rate of metallic shield slot and design shielding
Deviation between rate can achieve within 5%, meet project designing accuracy requirement.
Detailed description of the invention
Fig. 1 is flow diagram of the invention；
Fig. 2 is that square section metallic shield slot of the present invention is equivalent to showing for the same oval cross section metal shielded-plate tube of material isoperimetric
It is intended to.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to
Following embodiments.
For the convenient design for realizing nonaxisymmetrical square section metallic shield slot, the present invention proposes a kind of for shielding
Square section metallic shield slot is equivalent to together by the square section metallic shield slot design method of ultra low yield point steel, this method
It is described just to simplify estimation using the ultra low yield point steel shielding rate of axial symmetry shielded-plate tube for the circular section metallic shield pipe of the perimeters such as material
The ultra low yield point steel shielding rate of square-section metallic shield slot obtains the square section for meeting setting ultra low yield point steel shielding rate
The material and size of metallic shield slot, detailed process are as shown in Figure 2.
For shielding the magnetic field the power frequency around distribution line (50Hz).The quasi- laying of certain 380V three-phase single-core cable distribution wire
It in the aluminium slot of square section, need to be designed by shielding trench, reach the shielding rate for having 0.35 to power frequency magnetic field.Shield calibration
Justice is S=B1/B0, B1To there is square section aluminium shielding trench to shield the magnetic induction density of certain point near route later, B0Not have
The magnetic induction density of point when shielding.Implement by specific steps of the invention as follows:
A. the ultra low yield point steel shielding rate S needed is determined according to design requirementtIt is 0.35.
B. according to by the arrangement of shielding ultra low yield point steel source (power frequency 380V three-phase single-core cable distribution wire), by meeting cloth
It sets, intensity and insulating requirements, primarily determines that square section metallic shield slot is aluminum material, side length L=300mm, thickness t=
1.5mm。
C., square section aluminium shielding trench is equivalent to the aluminium shielded-plate tube of perimeters, as shown in Fig. 2, i.e. radius is r=
191mm, with a thickness of the aluminium shielded-plate tube of t=1.5mm.
D. square section metal screen is calculated with the ultra low yield point steel shielding rate reduced mechanical model of axial symmetry aluminium shielded-plate tube
Cover the ultra low yield point steel equivalent shield rate S of slot.With the magnetic field shielding rate reduced mechanical model of thin metallic tubd
In formula,For the depth of penetration.
Parameter is substituted into, f=50Hz, aluminium is non-magnetic material, magnetic permeability μ=4 π × 10-7, conductivityσ=3.6 × 107.It is thick
Spend t=0.0015m, r=0.191m.It can be calculated S=0.439.
E. check that shielding rate S=0.439 is greater than St=0.35, the thickness of square section metallic shield slot need to be increased, or
Increase side length, or select the material of higher relative permeability, or using the combination of these measures.In this example, because in engineering
It determines and uses aluminium slot, using the measure for increasing square section side length, side length increases to 400mm, return step C.It recalculates, L
When=0.4m, the aluminium shielded-plate tube radius for being equivalent to perimeters is r=0.255m.S=0.344 is calculated to obtain with formula (1) by step D,
Less than St=0.35.Design is completed, and determination uses side length for 0.4m, with a thickness of the square section aluminium slot of 1.5mm.
In the present embodiment, it if do not used method of the invention, by existing method, needs soft using electromagnetic field numerical simulation
Part calculates the power frequency magnetic field shielding rate of square section aluminium slot, needs Modeling Calculation, and design can be much more complex.In addition, if with
Existing method such as Infolytica software modeling simulation calculation, when L=0.3m, is calculated using electromagnetic field numerical simulation software
S=0.442；When L=0.4m, S=0.345 is calculated to obtain.Compared with the result of the method for the present invention, difference is respectively less than 1%.Thus may be used
Know, the method for the present invention is not only convenient easy-to-use, and design accuracy is also very high compared with the conventional method.
The preferred embodiment of the present invention has been described in detail above.It should be appreciated that those skilled in the art without
It needs creative work according to the present invention can conceive and makes many modifications and variations.Therefore, all technologies in the art
Personnel are available by logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Technical solution, all should be within the scope of protection determined by the claims.
Claims (5)
1. a kind of square section metallic shield slot design method for shielding ultra low yield point steel, which is characterized in that this method will just
Square-section metallic shield slot is equivalent to the circular section metallic shield pipe of the perimeters such as same material, using the extremely low of axial symmetry shielded-plate tube
Frequency magnetic field shielding rate simplifies the ultra low yield point steel shielding rate for estimating the square section metallic shield slot, and acquisition meets setting pole
The material and size of the square section metallic shield slot of low frequency magnetic field shielding rate, method includes the following steps:
A setting ultra low yield point steel shielding rate S) is obtainedt；
B) initialization square section metallic shield is required according to by the arrangement states in shielding ultra low yield point steel source and strength dielectric
The material and size of slot；
C) step B) the square section metallic shield slot obtained is equivalent to the circular section metallic shield pipe of the perimeters such as same material；
D the ultra low yield point steel shielding rate S ' for) calculating the circular section metallic shield pipe, using the ultra low yield point steel shielding rate S ' as
The ultra low yield point steel equivalent shield rate S of the square section metallic shield slot；
E) judge whether the ultra low yield point steel equivalent shield rate S meets S≤St, if so, current material and size are saved,
Design terminates, if it is not, after then changing material and the size of square section metallic shield slot, return step C).
2. the square section metallic shield slot design method of shielding ultra low yield point steel according to claim 1, feature
It is, the size includes the side length of square section and the thickness of metallic shield slot.
3. the square section metallic shield slot design method of shielding ultra low yield point steel according to claim 1, feature
It is, the step D) in, ultra low yield point steel equivalent shield rate S, which simplifies, to be calculated are as follows:
In formula, intermediate parameters K, k are respectively defined as:Wherein, δ is the depth of penetration,R is the radius of circular section metallic shield pipe, and t is the thickness of circular section metallic shield pipe, and f is frequency, and μ is magnetic
Conductance, σ are conductivity.
4. the square section metallic shield slot design method of shielding ultra low yield point steel according to claim 2, feature
It is, the step E) in, the material and size that change square section metallic shield slot specifically include one in following measures
Kind is a variety of: increasing the thickness of metallic shield slot, increases the side length of square section and selects the material of higher relative permeability.
5. the square section metallic shield slot design method of shielding ultra low yield point steel according to claim 1, feature
It is, the step B) in, it include cable, conducting wire or bus by shielding ultra low yield point steel source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710333857.9A CN107135636B (en) | 2017-05-12 | 2017-05-12 | A kind of square section metallic shield slot design method shielding ultra low yield point steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710333857.9A CN107135636B (en) | 2017-05-12 | 2017-05-12 | A kind of square section metallic shield slot design method shielding ultra low yield point steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107135636A CN107135636A (en) | 2017-09-05 |
| CN107135636B true CN107135636B (en) | 2019-04-16 |
Family
ID=59731504
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710333857.9A Active CN107135636B (en) | 2017-05-12 | 2017-05-12 | A kind of square section metallic shield slot design method shielding ultra low yield point steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107135636B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1618145A (en) * | 2000-03-06 | 2005-05-18 | 马科尼英国知识产权有限公司 | Screens for RF magnetic flux |
| JP2005150427A (en) * | 2003-11-17 | 2005-06-09 | Sumitomo Metal Mining Co Ltd | Designing method of electromagnetic shield film and its mesh structure pattern |
| CN101478118A (en) * | 2009-01-24 | 2009-07-08 | 国网电力科学研究院 | Design method for protecting chamber shielding body |
| JP2011254865A (en) * | 2010-06-06 | 2011-12-22 | Kajima Corp | Design method and program for magnetic shield chamber of strong magnetic field generator |
-
2017
- 2017-05-12 CN CN201710333857.9A patent/CN107135636B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1618145A (en) * | 2000-03-06 | 2005-05-18 | 马科尼英国知识产权有限公司 | Screens for RF magnetic flux |
| JP2005150427A (en) * | 2003-11-17 | 2005-06-09 | Sumitomo Metal Mining Co Ltd | Designing method of electromagnetic shield film and its mesh structure pattern |
| CN101478118A (en) * | 2009-01-24 | 2009-07-08 | 国网电力科学研究院 | Design method for protecting chamber shielding body |
| JP2011254865A (en) * | 2010-06-06 | 2011-12-22 | Kajima Corp | Design method and program for magnetic shield chamber of strong magnetic field generator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107135636A (en) | 2017-09-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105780014B (en) | A kind of buried pipeline cathode protection method and cathodic protection system | |
| Luo et al. | Calculation of the 3-D ionized field under HVDC transmission lines | |
| CN103135137B (en) | A kind of grounded screen topology detection method based on the differential method | |
| CN103675611A (en) | Collection point positioning method and system in partial discharge detection for tubular insulating bus | |
| CN106641741A (en) | Device and method for detecting damaged point of outer wall corrosion-resistant layer of extra-buried deep pipeline | |
| Qamar et al. | Breakpoint diagnosis of substation grounding grid using derivative method | |
| CN105223413A (en) | A kind of marine ship seawater pipeline stray current detecting device | |
| Li et al. | A novel mathematical modeling of grounding system buried in multilayer earth | |
| Machado | Magnetic field mitigation shielding of underground power cables | |
| CN107135636B (en) | A kind of square section metallic shield slot design method shielding ultra low yield point steel | |
| CN107148206B (en) | A kind of rectangular section metallic shield slot design method shielding ultra low yield point steel | |
| CN107831353B (en) | Novel step voltage calculation method based on different burial depths of annular direct current transmission grounding electrode | |
| CN105676299A (en) | Grounded source short offset transient electromagnetic method apparent resistivity determination method and device | |
| CN108828398A (en) | A kind of single-core cable partial discharge location method based on structural similarity algorithm | |
| Li et al. | Identification and Visualization of Coupling Paths-–Part II: Practical Application | |
| CN108345743B (en) | Electromagnetic safety analysis method for wireless power supply device of high-voltage line online monitoring terminal | |
| CN115640732B (en) | Power distribution network arc fault positioning method based on magnetic field distribution | |
| CN107589350A (en) | A kind of method for oil-gas pipeline seal performance test | |
| CN209820745U (en) | Multifunctional test field for nuclear power plant buried pipe detection technology | |
| CN110232739A (en) | A kind of method that CAD topographic map data is converted to power circuit section | |
| CN103472415B (en) | A kind of small scale test method of air reactor space magnetic field | |
| CN105372710B (en) | A kind of conducting wire detection method and system | |
| CN109684780B (en) | Extra-high voltage direct current transmission double-ring grounding electrode optimal inner-outer ring ratio calculation method | |
| CN204831414U (en) | Be applied to electromagnetic sensor of frequency conversion excitation technique | |
| Kost et al. | Different numerical methods for electromagnetic field computation with thin shielding sheets |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |