[go: up one dir, main page]

WO2018011679A9 - Panneau et système de blindage électromagnétique - Google Patents

Panneau et système de blindage électromagnétique Download PDF

Info

Publication number
WO2018011679A9
WO2018011679A9 PCT/IB2017/054097 IB2017054097W WO2018011679A9 WO 2018011679 A9 WO2018011679 A9 WO 2018011679A9 IB 2017054097 W IB2017054097 W IB 2017054097W WO 2018011679 A9 WO2018011679 A9 WO 2018011679A9
Authority
WO
WIPO (PCT)
Prior art keywords
panel
flat
plate
panels
panel body
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.)
Ceased
Application number
PCT/IB2017/054097
Other languages
English (en)
Other versions
WO2018011679A1 (fr
Inventor
Aldo Canova
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sati Shielding Srl
Original Assignee
Sati Shielding Srl
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sati Shielding Srl filed Critical Sati Shielding Srl
Publication of WO2018011679A1 publication Critical patent/WO2018011679A1/fr
Publication of WO2018011679A9 publication Critical patent/WO2018011679A9/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • H05K9/0073—Shielding materials
    • H05K9/0075—Magnetic shielding materials
    • 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
    • H05K9/0001—Rooms or chambers

Definitions

  • the present invention relates to an electromagnetic shielding panel and system
  • the present invention has been developed in particular in view of producing electromagnetic shielding systems designed to mitigate magnetic fields at civil and industrial frequencies (up to 100 kHz) .
  • Technical standards and laws establish maximum reference levels of the intensity of these magnetic fields considered compatible with human health or with the regular operation of devices of various types.
  • the intensity of a magnetic field is generally defined by the value of the magnetic induction, measured in Tesla (T) or in sub-multiples (e.g. mT or ⁇ ) .
  • the geometry of the electromagnetic emission sources or the current values do not allow compliance with the levels outlined by the standards, recommendations and laws and, therefore, magnetic field mitigation systems (shielding) are required.
  • the performance of a shielding system is defined by the relationship between the magnetic induction values at a point, in the absence and in the presence of shielding. This parameter is defined as the shielding factor or attenuation factor and is greater than 1. The larger the shielding factor, the greater the shield performs its function.
  • the shielding factor is variable from point-to-point, and its valve therefore depends on the point of the space in which it is calculated. Typically, significant points assumed are those characterized by the maximum value of the magnetic field within the area to be protected or those close to positions occupied by persons or workers.
  • the shields can be of the open or closed type. Closed-type shields are usually used in the case of shielding of components, while in the case of shielding of electrical infrastructures, for economic reasons and technical feasibility, open shields are usually used on one or more walls of the premises containing the source or the area to be protected.
  • passive shields they are divided into two categories: ferromagnetic shields and conductive shields .
  • Ferromagnetic shields are made of plates of ferromagnetic material (ferrous-based materials), which intercept the magnetic field to be shielded, reducing its intensity into the surrounding region. Since the magnetic field values are generally in the order of ⁇ and mT, ferromagnetic shields require the use of materials characterized by a high magnetic permeability in low magnetic fields, known as the initial magnetic permeability. With particular reference to the open- type shields, ferromagnetic shields are characterized by a high shielding factor near the shield, but by a rapid decline in the shielding factor upon gradually moving away from the shield due to the natural reclosing of the magnetic field lines beyond a certain distance from the shield.
  • Conductive passive shields are formed of plates of conductive material, typically aluminium or copper. Their principle of operation is based on the law of electromagnetic induction: the magnetic field to be shielded creates induced currents in the shielding plates (called Foucault currents) , which generate an opposite magnetic field to the magnetic field to be shielded.
  • Conductive shields are often used to shield the fields produced by power lines and low, medium, and high voltage components.
  • the conductive shields are characterized by maximum shielding factors lower than those of the ferromagnetic shields. However, with conductive shields, higher shielding factor values are maintained when moving away from the shield.
  • electromagnetic shielding panels are frequently used that comprise at least one ferromagnetic plate and at least one conductive plate, coupled together to form a multilayer shield.
  • Conductive, ferromagnetic, or mixed shielding systems are generally formed by a plurality of panels of determined dimensions, arranged with respective sides alongside each other. The sides of two adjacent panels are usually fixed together by means of welding. The continuity of the conductive material between adjacent panels significantly influences the performance of the shielding system.
  • Figure 1 shows a shielding system formed of four panels 10 arranged with their respective sides 2 facing each other, but without a reciprocal electrical connection. In this case, it is noted that the currents induced in the individual shielding panels, which are not electrically connected to each other, are reclosed on the individual panels. The shielding effect is therefore limited, as the induced currents meet a path with greater electrical impedance.
  • the object of the present invention is to provide an electromagnetic shielding panel and a shielding system that overcome the problems of the prior art.
  • this object is achieved by an electromagnetic shielding panel and an electromagnetic shielding system having the characteristics forming the subject of the claims.
  • the shielding panel according to the present invention has a quadrangular flat panel body with two flat contiguous edges and two bent contiguous edges forming two overlapping portions, offset with respect to the plane of the panel body, each of which is configured to overlap with a flat edge of an adjacent panel .
  • FIG. 1 is a schematic front view illustrating a shielding system according to the prior art with shielding panels not electrically connected to each other,
  • FIG. 2 is a plan view of a shielding panel according to the present invention
  • FIG. 3 is a view of a shielding system formed by a plurality of panels according to the invention, alongside each other
  • FIG. 4 is a cross-section along the line IV- IV of Figure 3
  • FIG. 5 is a schematic view illustrating the distribution of the magnetic flux through the overlapping area in the solution of Figure 4,
  • Figure 7 illustrates the overlapping area between two adjacent panels in a second variant of the present invention
  • FIG. 8 is a partial perspective view of the part indicated by the arrow VIII in Figure 7,
  • FIG. 9 is a schematic view showing the flow of magnetic flux in the overlapping area between two adjacent panels in the solution of Figure 7,
  • Figure 10 shows the overlapping area with multilayer panels of different types
  • Figure 11 schematically shows the currents induced in a shielding system according to the present invention.
  • Figure 12 is a cross-section along the line XII- XII of Figure 11.
  • numeral 10 indicates an electromagnetic shielding panel according to the present invention.
  • the panel 10 has a quadrangular flat panel body 12, for example, of a square shape, whose sides are indicated by A.
  • the panel body 12 has the shape of a quadrangular flat plate with constant thickness and has two flat contiguous edges 14, 16 and two bent contiguous edges 18, 20.
  • the flat edges 14, 16 are level with the panel body 12.
  • the bent edges 18, 20 are formed by bending lines 18, 20, which form two strip-shaped overlapping portions 22, 24, parallel to the respective sides of the panel body 12.
  • the overlapping portions 22, 24 are offset with respect to the plane of the panel body 12, and are configured to overlap with a flat edge 14, 16 of an adjacent panel 10.
  • the overlapping portions 20, 22 have respective square-shaped cuts 26, 28, the side B of which is equal to the width of the overlapping portions 22, 24.
  • the cuts 26, 28 are adjacent to the respective flat sides 16, 14, and an additional square cut 30 with side B is located at the vertex between the bent edges 18, 20.
  • Figure 3 illustrates an electromagnetic shielding system 30, formed by a plurality of panels 10 alongside each other.
  • the overlapping portions 22, 24 of each panel 10 overlap with respective flat edges 14, 16 of adjacent panels 10. In this way, the transition area between two adjacent panels is always covered by an overlapping portion 22, 24.
  • the adjacent panels 10 are fixed together by welded sections 34, which join the outer sides of the overlapping portions 22, 24 of each panel 10 to the upper surface of the panel body 12 of an adjacent panel 10.
  • the cuts 26, 28 allow the arrangement of the overlapping portions 22, 24 on the respective flat edges 14, 16 of adjacent panels without interference.
  • the cut 30 between two contiguous overlapping portions 22, 24 of the same panel has the object of simplifying the bending of the overlapping portions 22 , 24.
  • Each panel 10 comprises at least one conductive or ferromagnetic plate.
  • each panel 10 can be formed of a single conductive or ferromagnetic plate.
  • each panel 10 can be formed by at least one conductive plate overlapping with at least one ferromagnetic plate.
  • Figure 4 shows the case in which each panel 10 has a multilayer structure consisting of a conductive plate 36 and a ferromagnetic plate 38, which are in contact with each other along respective main faces.
  • the thickness of the panel body 12, indicated with h is the sum of the thicknesses of the conductive plate 36 and the ferromagnetic plate 38.
  • Each overlapping portion 22, 24 is parallel to the panel body 12 and is offset with respect to the panel body 12 by a distance equal to the thickness h of the panel body 12.
  • the panel bodies 12 of two adjacent panels 10 are coplanar to each other and the overlapping portions 22, 24 of each panel are arranged above and in contact with the flat edges 14, 16 of the adjacent panels 10.
  • the upper surface of the conductive plate 36 of a panel is in contact with the lower surface of the ferromagnetic plate 38 of the overlapping portion 24 of the adjacent panel 10.
  • Figure 4 also illustrates the welding 34 that joins the outer edge of the overlapping portion 24 to the adjacent panel 10. The welding 34 establishes the electrical connection between the conductive plates 36 of the adjacent panels.
  • Figure 5 schematically shows the distribution of the magnetic flux in the junction area between two panels.
  • the magnetic flux passes from the ferromagnetic plate 38 of a panel 10 to the ferromagnetic plate 38 of the adjacent panel through the portion of the conductive plate 36 of the panel 10 covered by the overlapping portion 24.
  • the passage of the magnetic flux through a portion of the conductive plate 36 causes an increase in the magnetic reluctance.
  • the solution illustrated in Figure 6 can be adopted, which provides a section 40 of the ferromagnetic plate 38 bent above the conductive plate 36 along the two flat edges 14, 16 of the panel body 12.
  • a section 40 of the ferromagnetic plate 38 is in direct contact with the ferromagnetic plate 38 of the respective overlapping portion 22, 24. This allows a continuity of the ferromagnetic material through the junction area between two adjacent panels.
  • the solution of Figure 6 is created by providing a longer plate of ferromagnetic material 38 compared to the plate of conductive material 36, and folding the portions of the ferromagnetic plate 38 protruding beyond the edges of the conductive plate 36 along the two flat edges 14, 16 of the panel body 12.
  • FIGs 7, 8 and 9 An alternative solution for obtaining the ferromagnetic continuity between adjacent panels is illustrated in Figures 7, 8 and 9.
  • an elongated profile 42 of ferromagnetic material bent with a U-shaped cross section, is provided.
  • the profile 42 of ferromagnetic material has two flat portions 44 parallel to each other and spaced apart by a distance h equal to the thickness of the panel body 12.
  • the profiles 42 are applied along the flat edges 14, 16 of the panel body 12.
  • each profile 42 establishes a ferromagnetic continuity between the ferromagnetic plates 38 of two adjacent panels.
  • Figure 9 illustrates the distribution of the magnetic flux in the solution of Figures 7 and 8.
  • the solutions illustrated in Figures 6 and 7-9 allow a reduction in magnetic reluctance with respect to the solution illustrated in Figures 4 and 5.
  • Figure 10 shows the overlapping area between two adjacent panels, each of which comprises two conductive plates 36 and a ferromagnetic plate 38 sandwiched between the two conductive plates 36.
  • the solution according to the present invention provides compensation of the magnetic fields at the edges of the plates due to the reclosing of the currents within the conductive plates 36 of the individual panels.
  • the currents induced in the conductive plates 36 have opposing directions along the edges of the panels and, therefore, generate local magnetic fields that are mutually compensated. This compensation causes a benefit relative to the effects at the edges.
  • Figure 12 in fact, illustrates that in the overlapping area, the two overlapping edges are paths of currents induced in opposite directions.
  • the overlapping between the edges of adjacent panels in a shielding system according to the present invention allows a considerable reduction in the magnetic coupling reluctance between the panels with respect to the solutions according to the prior art in which the adjacent panels are head-to-head.
  • the reduction in magnetic reluctance can be further improved by providing a ferromagnetic continuity between the adjacent panels as illustrated in Figures 6 and 7-9.
  • the welding between the conductive plates 36 of two adjacent panels allows restoration of electrical continuity between adjacent panels.
  • the electrical continuity between the conductive plates eliminates the reclosing of the induced currents on the conductive plates 36 of the individual panels.
  • the welding of adjacent panels can be easily carried out even in the case of high installation tolerances. Overlapping between the edges facilitates the installation of the panels and also allows greater margins on the production tolerances of the panels and on the installation tolerances.
  • the bent edges forming the overlapping portions facilitate installation of the ceiling panels.
  • subsequent panels can use the protruding overlapping edges of the fixed panel as a support area.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Particle Accelerators (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

Un panneau de blindage électromagnétique comprenant au moins une plaque conductrice (36) et/ou au moins une plaque ferromagnétique (38), comprenant un corps de panneau plat quadrangulaire (12), ayant deux bords contigus plats (14, 16) et deux bords contigus pliés (18, 20) formant deux parties se chevauchant (22, 24) décalées par rapport au plan du corps de panneau (12), dont chacune est configurée pour se chevaucher avec un bord plat (14, 16) d'un panneau adjacent (10).
PCT/IB2017/054097 2016-07-14 2017-07-07 Panneau et système de blindage électromagnétique Ceased WO2018011679A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102016000073893 2016-07-14
IT102016000073893A IT201600073893A1 (it) 2016-07-14 2016-07-14 Pannello e sistema di schermatura elettromagnetica

Publications (2)

Publication Number Publication Date
WO2018011679A1 WO2018011679A1 (fr) 2018-01-18
WO2018011679A9 true WO2018011679A9 (fr) 2018-03-08

Family

ID=57708663

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2017/054097 Ceased WO2018011679A1 (fr) 2016-07-14 2017-07-07 Panneau et système de blindage électromagnétique

Country Status (2)

Country Link
IT (1) IT201600073893A1 (fr)
WO (1) WO2018011679A1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3364298A (en) * 1966-04-15 1968-01-16 Sprague Electric Co Ferromagnetic shielding
DE4029498A1 (de) * 1990-09-18 1992-03-19 Vacuumschmelze Gmbh Abschirmkabine mit tragendem sandwich-aufbau
GB2422384A (en) * 2005-01-21 2006-07-26 Corus Uk Ltd Magnetic shield

Also Published As

Publication number Publication date
WO2018011679A1 (fr) 2018-01-18
IT201600073893A1 (it) 2018-01-14

Similar Documents

Publication Publication Date Title
KR101732291B1 (ko) 버스 바 및 버스 바 모듈, 및 버스 바의 제조 방법
RU2518187C2 (ru) Устройство индукционного нагрева с поперечным потоком
CN105431916B (zh) 电磁场限制
RU2613625C2 (ru) Обеспечение сухопутного транспортного средства, прежде всего рельсового транспортного средства или дорожного автомобиля, электрической энергией посредством индукции
CA2786334C (fr) Dispositif de chauffage electrique pour vehicules comportant un systeme electrique haute tension
CA2527050A1 (fr) Ecran electromagnetique pour bobine chauffante a induction
US11342114B2 (en) Leakage transformer
del Pino Lopez et al. Influence of different types of magnetic shields on the thermal behavior and ampacity of underground power cables
JP2017143250A (ja) リニア磁気コア体を有するマルチパルス電磁デバイス
KR101407884B1 (ko) 변압기
US10102966B2 (en) Stationary induction apparatus
CN112997264A (zh) 空气断路器的变流器
WO2018011679A1 (fr) Panneau et système de blindage électromagnétique
del Pino-Lopez et al. Magnetic field shielding of underground cable duct banks
Olivares et al. Improved insert geometry for reducing tank-wall losses in pad-mounted transformers
CN112635177A (zh) 一种变压器漏磁屏蔽系统及变压器
EP3285546A1 (fr) Cuiseur
Koroglu et al. Influence of contact resistance on shielding efficiency of shielding gutters for high-voltage cables
EP4418480A1 (fr) Barre omnibus blindée
US6028266A (en) Low frequency EMF shield
CN104969309A (zh) 用于承载至少一个线圈的磁性回路
Tsuruta et al. High performance shield room for intermediate frequency magnetic fields
WO2019090358A1 (fr) Noyau magnétique en matériau mixte de blindage de pertes en excès induites par un courant de foucault
KR20130021263A (ko) 전자기장 차폐망
JP7601573B2 (ja) パワーコンバータ、発電機とパワーコンバータを含む配列及び車両

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 17745512

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase in:

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 17745512

Country of ref document: EP

Kind code of ref document: A1