A Design Method of Square-section Metal Shielding Slot for Shielding Extremely Low Frequency Magnetic Field
A technology of metal shielding and low-frequency magnetic field, which is applied in metal containers, magnetic/electric field shielding, screening casings, etc., can solve problems such as inconvenient engineering applications, meet engineering design accuracy requirements, and improve engineering design efficiency.
Active Publication Date: 2019-04-16
SHANGHAI MUNICIPAL ELECTRIC POWER CO +2
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Problems solved by technology
The design of metal slot shields with non-axisymmetric shapes requires numerical calculation methods, which are realized with the help of electromagnetic field numerical calculation software, which is extremely inconvenient in engineering applications
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[0023] The present invention will be described in detail below with reference to the drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation mode and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.
[0024] In order to realize the convenient design of non-axisymmetric square-section metal shielding grooves, the present invention proposes a square-section metal shielding groove design method for shielding extremely low frequency magnetic fields. Long circular section metal shielding tube, using the extremely low frequency magnetic field shielding rate of the axisymmetric shielding tube to simplify the estimation of the extremely low frequency magnetic field shielding rate of the square section metal shielding groove, and obtain the square section metal shielding groove that meets the set extre...
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The invention relates to a method for designing a square cross-section metal shield groove for shielding an extremely low frequency magnetic field. In the method, a square cross-section metal shield groove is equivalent to a circular cross-section metal shield tube of the same material and with an equal perimeter, the shielding rate of an extremely low frequency magnetic field of the square cross-section metal shield groove is estimated in a simplified manner by using the shielding rate of the extremely low frequency magnetic field of an axial symmetric shield tube, and the material and size of the square cross-section metal shield groove with the shielding rate conforming to a set shielding rate of the extremely low frequency magnetic field are obtained. Compared with the prior art, the method of the invention has the advantages of improving the designing efficiency of the square cross-section shield groove and the like, and can make the deviation between an actual shielding rate and a designed shielding rate of the metal shield groove within 5%.
Description
Technical field [0001] The invention relates to the technical field of extremely low frequency magnetic field shielding, in particular to a method for designing a square section metal shielding groove for shielding extremely low frequency magnetic field. Background technique [0002] Extremely low frequency magnetic field refers to an alternating magnetic field with a frequency in the range of 3 Hz to 300 Hz, which is commonly found around lines or facilities carrying extremely low frequency alternating currents, for example, power frequency (50 Hz or 60 Hz) magnetic fields around AC high and low voltage transmission and distribution lines . With the popularization of sensitive electronic equipment, there are often occasions where the level of the extremely low frequency magnetic field around the distribution line needs to be controlled, that is, the extremely low frequency magnetic field around the line needs to be shielded. The design of axisymmetric metal tube shielding has b...
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IPC IPC(8): H05K9/00
CPCH05K9/0049H05K9/0098
Inventor 辛亮戴晓敏戴明秋
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO