CN105575543A - Anti-magnetic-induction-coupling signal cable - Google Patents

Anti-magnetic-induction-coupling signal cable Download PDF

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Publication number
CN105575543A
CN105575543A CN201610125859.4A CN201610125859A CN105575543A CN 105575543 A CN105575543 A CN 105575543A CN 201610125859 A CN201610125859 A CN 201610125859A CN 105575543 A CN105575543 A CN 105575543A
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China
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magnetic
masking layer
signal cable
magnetic masking
signal
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CN201610125859.4A
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CN105575543B (en
Inventor
王群
胡涛春
黄靖宇
唐章宏
周东伟
王澈
瞿志学
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Beijing University of Technology
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Beijing University of Technology
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/02—Cables with twisted pairs or quads
    • H01B11/06—Cables with twisted pairs or quads with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens
    • H01B11/10—Screens specially adapted for reducing interference from external sources

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Insulated Conductors (AREA)
  • Communication Cables (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

The invention discloses an anti-magnetic-induction-coupling signal cable, which comprises a core wire, an insulation layer, a conductive layer, an insulation layer, a magnetic permeability shielding material layer and an outer sheath from the inside out in sequence. The cable has the anti-electromagnetic-shielding performance of other signal cables, and also has the low-frequency anti-magnetic-induction-coupling performance, meets broadband anti-magnetic-induction-coupling application, and can effectively prevent interference of an external electromagnetic field on the signal cable. The cable is simple in structure, easy to produce, good in performance, capable of meeting the use requirement in complex electromagnetic field environment, and extremely wide in application range.

Description

A kind of diamagnetic inductively signal cable
Technical field
The invention belongs to field of telecommunications cables, especially relate to the diamagnetic inductively signal cable of the one used under strong, weak electricity complex electromagnetic environment.
Background technology
Along with the fast development of economy, increasing electrified equipment is used in economic construction.Cooperatively interacting between various cable is be unable to do without in the use procedure of equipment, but the arrangement of the close mode of equipment to cable proposes very large requirement, the various cable tight line that gathers even shows as the form of bunch of cables, the electromagnetic environment that when different cables works, easily generation one is complicated in little space, causes between some parallel wiring cables and mutually disturbs.
Because transmitting energy between different cables is different, the electric energy of prevailing transmission macro-energy at work in power cable, and the low-energy weak electric signal of prevailing transmission during signal cable work.When power cable and signal cable parallel wiring, easily form a forceful electric power signal to the interference of weak electric signal.Forceful electric power signal comprises the interference of electric jamming, high frequency magnetic field and low frequency magnetic field to the electromagnetic interference that weak electric signal causes, and general signal cable is at shielding performance very excellent, but very micro-to the shield effectiveness of low frequency magnetic field of electric jamming and high frequency magnetic field.Can know that magnetic coupling interference easily occurs the low frequency magnetic field that forceful electric power signal produces on signal cable by maxwell theory, signal cable generates the induced electromotive force of some strength, induced electromotive force easily causes some weak electric signals, in the transmitting procedure of signal cable, error code or distortion occur,, even there is serious accident in the normal operation of influential system.Therefore, develop a kind of diamagnetic signal cable inductively greatly can protect the magnetic coupling environment that weak electric signal produces at forceful electric power signal under transmission.
Summary of the invention
In order to solve the low magnetic screen problem existed in background technology, the present invention proposes a kind of diamagnetic signal cable inductively adopting particulate metal shielding layer structure and using method, when being mainly used in the serious complex electromagnetic environment of magnetic interference.
When signal cable works, power cable around can produce electromagnetic interference to it.Alternating current in power cable easily produces high-intensity magnetic field in space and causes magnetic coupling to disturb to signal cable.And by Faraday's electromagnetic induction law wherein for magnetic flux, can know that reducing magnetic coupling interference can realize by reducing the approach of magnetic flux.And by wherein S is loop area, and B is magnetic flux density.Therefore magnetic coupling interference can be reduced by reducing S and B.
A kind of diamagnetic inductively signal cable, is characterized in that: be followed successively by heart yearn, insulating barrier, conductive layer, insulating barrier, magnetic masking layer from inside to outside, oversheath.A kind of diamagnetic inductively signal cable, it is characterized in that, magnetic masking layer material is relative permeability μ rfor the magnetically soft alloy of 200-200000.Signal cable of the present invention to external world magnetic Field Coupling interference has shield effectiveness, and external magnetic field is drawn by following formula signal cable coupled interference electromotive force value:
When not using magnetic masking layer, external magnetic field to signal cable coupled interference electromotive force size is:
V 1 = - μ 0 d ∫ s H 1 ( t ) · d s d t
μ 0represent permeability of vacuum, H 1for not using external magnetic field intensity during magnetic masking layer, S represents signal circuit area.
After use magnetic masking layer, the coupled interference electromotive force size of external magnetic field to signal cable is then:
V 2 = - μ 0 2 D 2 D + μ r h · d ∫ s H 1 ( t ) · d s d t
μ rrepresent magnetic masking layer relative permeability, h represents the thickness of magnetic masking layer, and D represents the radius that magnetic masking layer is coated.
By reducing the coated radius D of magnetic masking layer; Increase the μ of magnetic masking layer material rand thickness h, the shield effectiveness that can obtain.
Further, the thickness of magnetic masking layer material can pass through above-mentioned V 2counter the pushing away of expression formula draws, according to magnetic interference environment under conventional work and limit minimum coupled interference electromotive force V 2employing magnetic masking layer thickness is the continuous film band of 5 ~ 100 μm, or fibre diameter is the fibre metal mesh grid of 5 ~ 100 μm.
Furtherly, in use, high conductivity structure sheaf one end and conductor core wire and load are in series, form signal circuit, outer field high magnetic permeability structure sheaf produces low frequency magnetic field shielding to signal circuit.
Furtherly, metal screen layer should be high-permeability material structure sheaf at skin, and needs to carry out coated to signal circuit, prevents the situation appearance that leakage field etc. affects magnetic screen.
In the present invention, adopt particulate metal shielding layer structure mainly because: high conductivity structure sheaf effectively can be coupled to field coupled and high frequency magnetic field and suppress, and effectively can reduce the area of signal circuit; And high-permeability material can effectively carry out magnetic shunt to low frequency magnetic field and produce inhibition.
The present invention, by adopting above technical scheme, reaches following beneficial effect.
1. effectively can play shield effectiveness to electromagnetic interference, ensure weak electric signal transmission.
2. operation strategies is wide, can use under complicated circuit environment.
3. structure is simple, convenient for production.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, invention is described further.
Fig. 1 is the magnet shielding structure figure of the diamagnetic inductively signal cable of the present invention.
Fig. 2 is the heart yearn of the diamagnetic inductively signal cable of the present invention, high conductivity material and load in series schematic diagram.
Fig. 3 is the signal circuit shielding schematic diagram of the diamagnetic inductively signal cable of the present invention.
Fig. 4 is high-permeability material of the present invention shunting magnetic flux schematic diagram.
In above figure be: 1, conductor core wire, 2 and 4, insulating barrier, 3, conductive layer, 5, magnetic masking layer, 6, oversheath, 7, magnetic flux, 8, load, oblique line represents signal circuit area, the magnetic interference that shadow representation signal circuit is subject to, the radius that D, magnetic masking layer are coated, the thickness of h, magnetic masking layer.
Concrete form of implementation
In the magnet shielding structure figure of the diamagnetic inductively signal cable shown in Fig. 1,1 is conductor core wire, ensures the transmission of signal; Metal screen layer comprises 3 and 5, is respectively high conductivity material screen and high magnetic permeability screen.2 is the insulating barrier between heart yearn 1 and screen 3; 4 is the insulating barrier between screen 3 and 5.
Fig. 2 is the magnetic screen schematic diagram of diamagnetic inductively signal cable.Can see that conductor core wire 1 and high conductivity material screen 3 and load 8 constitute signal circuit.
Fig. 3 is the signal circuit shielding schematic diagram of the diamagnetic inductively signal cable of the present invention.(1) magnetic interference be subject to for non-signal shielding cable heart yearn signal circuit; (2) time for using conductive layer and heart yearn to form signal circuit, owing to reducing loop area greatly, then the inductive interference voltage now in loop diminishes, but in longer loop, still there is very large inductive interference; (3) be shield effectiveness figure at cable of the present invention, due to the shunting flux interaction of magnetic masking layer, the magnetic field still existed in (2) shielded, form desirable diamagnetic inductively effect.
Fig. 4 is magnetic masking layer shunting magnetic flux schematic diagram.When in signal cable real work, as do not used magnetic masking layer 5, then external interference magnetic field can produce interference in signal circuit, show as and produce induced electromotive force in the loop, induced electromotive force can cause interference thus the Signal transmissions affected in loop on the original weak electric signal transmitted in signal cable, cause error code or the distortion of signal.Magnetic screen principle shown in Fig. 4 then can produce magnetic bypass effect in magnetic field to external world for having magnetic masking layer 5, magnetic flux 7 will concentrate in the low magnetic resistance flux path of magnetic masking layer 5, reduce disturbing magnetic field to the interference of signal circuit, ensure that the signal of telecommunication transmits normally in signal circuit.
The using method of the diamagnetic inductively signal cable of the present invention is: during use, conductive layer 3 needs and conductor 1 signal circuit in series, and magnetic masking layer 5 is as a magnetic masking layer, at the peripheral coated formation low-frequency magnetic of signal circuit along separate routes.So greatly reduce external interference magnetic field to disturb the magnetic coupling of signal cable.
Example explanation
Use normal signal cable respectively, have employed the holding wire formation loop of the diamagnetic inductively structure of the present invention, reference numeral loop, loop 1, loop 2.Cable length in loop is all 0.5m, and wherein ground plane height is 2.4cm, and the heart yearn in loop 2 and the distance of high conductivity material are 3mm, and the coated radius of high-permeability material is 4.5mm.In loop 2, high-permeability material is amorphous Fe-Si-Al material, and relative permeability is 2*10 4, high conductivity material is copper braid, and its conductivity is 58MS/m.There is interference power line near loop, frequency is 50Hz.Regulate the current value of different interference power lines, size is 0-10A, and the induced electromotive force in measuring-signal loop, test result is as shown in table 1.
Table 1
Can show that diamagnetic inductively structure has good diamagnetic sensitivity, the actual magnetic that therefore can apply to concrete signal cable is inductively in situation.
The shielding mode that cable of the present invention adopts and structure simply, are beneficial to processing and fabricating.Under the performance of electromagnetism interference ensureing general signal cable, also possess the diamagnetic inductively performance of low frequency magnetic field simultaneously especially, the request signal transmission under complex electromagnetic environment can be met.
Protection of the present invention is not limited to the above, above are only better embodiment of the present invention, all modify according to technical scheme of the present invention and inventive concept or equivalence replace, all within protection scope of the present invention.

Claims (3)

1. a diamagnetic inductively signal cable, is characterized in that: be followed successively by heart yearn, insulating barrier, conductive layer, insulating barrier, magnetic masking layer, oversheath from inside to outside.
2. the diamagnetic inductively signal cable of one according to claim 1, is characterized in that: magnetic masking layer material is relative permeability μ rfor the magnetically soft alloy of 200-200000;
Signal cable coupled interference value is drawn by following formula:
When not using magnetic masking layer, the coupled interference electromotive force of external magnetic field to signal cable is:
V 1 = - μ 0 d ∫ s H 1 ( t ) · d s d t
μ 0represent permeability of vacuum, H 1for not using external magnetic field intensity during magnetic masking layer, S represents loop signal area;
When using magnetic masking layer, the coupled interference electromotive force of external magnetic field to signal cable is then:
V 2 = - μ 0 2 D 2 D + μ r h · d ∫ s H 1 ( t ) · d s d t
μ rrepresent magnetic masking layer relative permeability, h represents the thickness of magnetic masking layer, and D represents the radius that magnetic masking layer is coated;
The thickness of magnetic masking layer material is by above V 2counter the pushing away of expression formula draws.
3. the diamagnetic inductively signal cable of one according to claim 1, is characterized in that: employing magnetic masking layer thickness is the continuous film band of 5 ~ 100 μm, or fibre diameter is the fibre metal mesh grid of 5 ~ 100 μm.
CN201610125859.4A 2016-03-06 2016-03-06 A kind of diamagnetic inductively signal cable Active CN105575543B (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106683760A (en) * 2017-02-16 2017-05-17 广州市智昌电子科技有限公司 Insulated wire coated with magnetic rubber in insulated manner
CN107233091A (en) * 2017-07-14 2017-10-10 陈晓苏 Biological electrical signal collecting device for shielding electromagnetic wave
CN109839605A (en) * 2019-02-23 2019-06-04 中国原子能科学研究院 A kind of construction of cable of high-precision magnetic-field measurement induction coil
CN110189869A (en) * 2019-06-10 2019-08-30 江苏南瑞恒驰电气装备有限公司 A method of inhibit GIS bus and GIL equipment electric power to damage using high permeability material coated conductor
US11483952B2 (en) 2017-04-28 2022-10-25 Halliburton Energy Services, Inc. Broadband wireline cable

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1412784A (en) * 2001-11-26 2003-04-23 汪建华 Braided sleeve for cable and its production method
CN2594936Y (en) * 2002-11-08 2003-12-24 钢铁研究总院 Cable line with electromagnetic shield
CN202677962U (en) * 2012-06-29 2013-01-16 江苏亨通线缆科技有限公司 Railway traffic signal transmission cable
CN104332220A (en) * 2014-11-12 2015-02-04 远东电缆有限公司 Flexible anti-nuclear electromagnetic pulse cable for smart information system
CN104332247A (en) * 2014-11-17 2015-02-04 安徽宏源特种电缆集团有限公司 Nuclear electro-magnetic pulse resistant type low-loss microwave coaxial cable and manufacturing method thereof
CN104878593A (en) * 2015-06-01 2015-09-02 深圳昊天龙邦复合材料有限公司 Electromagnetic shielding aramid fiber preparation method and electromagnetic shielding layer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1412784A (en) * 2001-11-26 2003-04-23 汪建华 Braided sleeve for cable and its production method
CN2594936Y (en) * 2002-11-08 2003-12-24 钢铁研究总院 Cable line with electromagnetic shield
CN202677962U (en) * 2012-06-29 2013-01-16 江苏亨通线缆科技有限公司 Railway traffic signal transmission cable
CN104332220A (en) * 2014-11-12 2015-02-04 远东电缆有限公司 Flexible anti-nuclear electromagnetic pulse cable for smart information system
CN104332247A (en) * 2014-11-17 2015-02-04 安徽宏源特种电缆集团有限公司 Nuclear electro-magnetic pulse resistant type low-loss microwave coaxial cable and manufacturing method thereof
CN104878593A (en) * 2015-06-01 2015-09-02 深圳昊天龙邦复合材料有限公司 Electromagnetic shielding aramid fiber preparation method and electromagnetic shielding layer

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106683760A (en) * 2017-02-16 2017-05-17 广州市智昌电子科技有限公司 Insulated wire coated with magnetic rubber in insulated manner
US11483952B2 (en) 2017-04-28 2022-10-25 Halliburton Energy Services, Inc. Broadband wireline cable
CN107233091A (en) * 2017-07-14 2017-10-10 陈晓苏 Biological electrical signal collecting device for shielding electromagnetic wave
CN109839605A (en) * 2019-02-23 2019-06-04 中国原子能科学研究院 A kind of construction of cable of high-precision magnetic-field measurement induction coil
CN109839605B (en) * 2019-02-23 2020-06-23 中国原子能科学研究院 Cable structure of high-precision magnetic field measurement induction coil
CN110189869A (en) * 2019-06-10 2019-08-30 江苏南瑞恒驰电气装备有限公司 A method of inhibit GIS bus and GIL equipment electric power to damage using high permeability material coated conductor

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