CN104798145A - Shield cable - Google Patents
Shield cable Download PDFInfo
- Publication number
- CN104798145A CN104798145A CN201380059377.8A CN201380059377A CN104798145A CN 104798145 A CN104798145 A CN 104798145A CN 201380059377 A CN201380059377 A CN 201380059377A CN 104798145 A CN104798145 A CN 104798145A
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- Prior art keywords
- shielded type
- tape
- electromagnetic shielding
- shield
- band
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Classifications
-
- 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
- H01B11/1025—Screens specially adapted for reducing interference from external sources composed of a helicoidally wound tape-conductor
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M1/00—Power supply lines for contact with collector on vehicle
- B60M1/02—Details
- B60M1/06—Arrangements along the power lines for reducing interference in nearby communication lines
-
- 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
- H01B11/1008—Features relating to screening tape per se
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Insulated Conductors (AREA)
- Communication Cables (AREA)
Abstract
The present invention relates to a shield cable that is located in the vicinity of a high voltage alternating current power line like an electric railway line, thereby providing excellent electromagnetic shielding performance.
Description
Technical field
The present invention relates to a kind of shielded type cable, more specifically, relate to a kind of shielded type cable, it is positioned at high-voltage alternating power line, near such as electric railroad electric wire, thus provides excellent capability of electromagnetic shielding.
Background technology
Along with railway is electrified, in order to share operation information and the control information of train, central operation system is used to carry out communicating and Signal transmissions.
With regard to the electric power system of electric railway, along railway mounting electrical railway electric wire to provide electric power to rolling stock, and along rail installing cables to carry out two-way communication or Signal transmissions in a given direction.
When short distance urban electric railway, the power supply for railway power system is direct current (DC) power supply, uses the electric power system of the railway of DC electric power will have electrostatic interference to the electric wire of surrounding.In order to prevent electrostatic interference, therefore, the low-resistance metal tape of cable surrounds.
But the electric power system for electrified metropolis railway uses and exchanges (AC) power supply, and in this case, AC power supplies causes electromagnetic induction, and electrostatic interference.
Electric railway line supplies power to by electrically driven (operated) rail facility (hereinafter referred to as electric train), but the railway be installed to be with run electric train is become to the cable of parallel relation, the electric current flowing to electric railway electric wire can cause electromagnetism/electrostatic interference to this cable.But, be different from the railway system using DC power supply, use the railway system of AC power supplies to produce electromagnetic induction, and electrostatic interference.Even if the low-resistance metal tape of cable surrounds, this electromagnetic interference is still transferred to cable.
In order to reduce the electromagnetic interference occurred on the cable installed along rail, high-permeability material is wrapped on cable, result, and the electromagnetic interference suffered by cable partly obtains shielding.
An example of conventional shielded type cable is disclosed in Japanese patent application No.2004-234870, wherein, for being installed in the electromagnetic shielded cable of the telecommunication cable on high-voltage power line in high-pressure area, such as, electric field strength is 300V/km or more than 300V/km, there is good capability of electromagnetic shielding, and guarantee in installment work simple and easy to do.
More specifically, the shielded type cable of above-mentioned routine comprises is with by two-layer the electro-magnetic screen layer formed, and described two-layer band is made up of orientation silicon steel or electric iron, wherein, forms the orientation silicon steel thickness of electro-magnetic screen layer between 0.29mm to 0.31mm.
The shielded type cable of above-mentioned routine adopts screen to improve ELECTROMAGNETIC OBSCURANT performance, but does not advise any structure or effort, and wherein, induced current helically flows, and can be increased in the inductance in electro-magnetic screen layer.
Be made up of two-layer band at ELECTROMAGNETIC OBSCURANT layer, wherein, two-layer band is made up of orientation silicon steel or electric iron, when to improve capability of electromagnetic shielding, as shown in the curve A in Fig. 6, manufacturing cost increases, iff providing the screen be made up of silicon steel, as shown in the curve B in Fig. 6, capability of electromagnetic shielding greatly fails in low field strength region (being about 270V/km or below 270V/km).
Summary of the invention
Technical problem
Therefore, in view of above-mentioned the problems referred to above produced in the prior art, the present invention is proposed, an object of the present invention is to provide a kind of shielded type cable, it is positioned at high-voltage alternating power line, such as, near electric railroad electric wire, thus provide excellent capability of electromagnetic shielding.
Technical scheme
According to an aspect of of the present present invention, above and other object can by providing shielded type cable to realize, and described shielded type cable comprises: the cable core of multiple band coating; Internal shield layer, forms with the periphery around described multiple cable core by metal material; Exterior shield layer, forms with spirally around the periphery of described internal shield layer by metal material, and insulate with described internal shield layer; And cover layer, described cover layer is used for the periphery around described exterior shield layer.
Described outside shielding layer can be coated with insulating material.
Described exterior shield layer can be the mask tape of the individual layer be wound around in the longitudinal direction at described shielded type cable, if described mask tape is helically wound around, described mask tape does not exist the distance at interval or there is lap on described mask tape.
Described exterior shield layer can be the mask tape of individual layer, if this mask tape is helically wound around, this mask tape exists the distance at interval.
Described exterior shield layer can have the mask tape of the bilayer be wound around with the distance at interval in the longitudinal direction of described shielded type cable, and at least one deck in these mask tapes is coated with insulating material.
Described exterior shield layer can have the mask tape of the bilayer be wound around with the distance at interval in the longitudinal direction of described shielded type cable, and insulating trip is arranged between described mask tape.
At least one deck in the mask tape of described exterior shield layer can be made up of any one in nickel steel or silicon steel.
The described mask tape of the described exterior shield layer be made up of any one in nickel steel and silicon steel can be disposed in the inside of described exterior shield layer, and is made up of around another mask tape of the periphery of one deck mask tape galvanized steel.
Described silicon steel can be non-orientation silicon steel.
Described nickel steel can have the nickel of 50% to 80% weight fraction.
The slit formed during internal shield band spiral winding in the mask tape of the bilayer of described exterior shield layer can be covered by external screen shield tape.
Described insulating coating can be made up of varnish coat (vanishcoating) the organic material with inorganic filler, and thickness is more than 4 μm or 4 μm.
Described insulating coating can have between 30 Ω/cm
2to 50 Ω/cm
2between surface insulation resistance.
According to one aspect of the present invention, above and other object can by providing shielded type cable to realize, and described shielded type cable comprises: the core with multiple cable core; Electrostatic screen portion, forms with the periphery around described core by metal material; Electromagnetic shielding portion, forms with around described electrostatic screen portion by metal material, and insulate with the described electrostatic screen portion having induced current spiral to flow out; And cover layer, described cover layer is used for the periphery around described electromagnetic shielding portion.
Described electrostatic screen portion has double-decker, and in described double-decker, internal shield band can be made up of high-permeability material, and external screen shield tape is made up of low magnetic permeability material, and described internal shield band and described external screen shield tape are helically wound around.
Described internal shield band can be made up of non-orientation silicon steel.
Described internal shield band can be made up of the nickel steel of the nickel with 50% to 80% weight fraction.
Any one in the internal shield band be made up of high-permeability material in described electromagnetic shielding portion and the external screen shield tape be made up of low magnetic permeability material is coated with insulating material.
Insulating trip can be set between the internal shield band be made up of high-permeability material in described electromagnetic shielding portion and the external screen shield tape be made up of low magnetic permeability material.
Described electrostatic screen portion and described electromagnetic shielding portion can be insulated from each other by insulating trip, the material wherein forming this insulating trip with for by identical for the material of the internal shield band in described electromagnetic shielding portion and the insulating trip of exterior shield tape insulation.
When the described external screen shield tape be made up of low magnetic permeability material is helically wound, the slit formed by the spiral winding institute compartment of terrain of the internal shield band be made up of high-permeability material in described electromagnetic shielding portion can crested.
According to an aspect of of the present present invention, by providing shielded type cable can realize above-mentioned target and other targets, wherein, described shielded type cable comprises: multiple cable core; Electrostatic screen portion, forms with around described cable core by metal material; And electromagnetic shielding portion, described electromagnetic shielding portion has the internal shield band be made up of high magnetic permeability metal material and the external screen shield tape be made up of low magnetic permeability metal material, and insulate in described electromagnetic shielding portion and described electrostatic screen portion, wherein, when described internal shield band and described external screen shield tape are helically wound around with state insulated from each other, according to the input voltage between 0V/km and 500V/km, shielding rate is less than 0.05 or 0.05.
Any one in the internal shield band be made up of high magnetic permeability metal material in described electromagnetic shielding portion and the external screen shield tape be made up of low magnetic permeability metal material can be coated with insulating material with allow described internal shield band and described external screen shield tape insulated from each other, in addition, or, arrange between described internal shield band and described external screen shield tape insulating trip with allow described internal shield band and described external screen shield tape insulated from each other.
Described electrostatic screen portion can be that the bellows be made of copper is formed.
Described electrostatic screen portion and described electromagnetic shielding portion can be insulated from each other by the sheath member be made up of polyethylene.
Beneficial effect
According to the present invention, described shielded type cable is positioned at high-voltage alternating power line, such as, near electric railroad electric wire, thus provides excellent capability of electromagnetic shielding.
Further, described shielded type cable can reduce the structural change for improving capability of electromagnetic shielding, thus manufacturing cost is reduced.
In addition, described shielded type cable can provide the electromagnetic shielding portion of the mask tape with individual layer by insulating coating, thus improves workmanship efficiency and reduce its weight and volume.
Accompanying drawing explanation
Fig. 1 a and Fig. 1 b illustrates perspective view according to the shielded type cable of the first embodiment of the present invention and cutaway view;
Fig. 2 a and Fig. 2 b is perspective view and the cutaway view of the shielded type cable illustrated according to a second embodiment of the present invention;
Fig. 3 a and Fig. 3 b is perspective view and the cutaway view of the shielded type cable illustrated according to the third embodiment of the invention;
Fig. 4 a and Fig. 4 b is perspective view and the cutaway view of the shielded type cable illustrated according to a fourth embodiment of the invention;
Fig. 5 is the curve chart of the shielding properties experiment of the shielded type cable illustrated according to a preferred embodiment of the invention;
Fig. 6 is the curve chart of the shielding properties experiment that conventional shielded type cable is shown.
Embodiment
Hereinafter, the explanation about shielded type cable is according to a preferred embodiment of the invention provided with reference to the accompanying drawings in detail.About the providing only in order to limit the preferred embodiments of the present invention of explanation of concrete structure and function, and the preferred embodiments of the present invention can provide in a variety of manners, are not limited to following described embodiment.In the description carried out the present invention with reference to accompanying drawing, identical element represents with identical Reference numeral each other, and succinct in order to what describe, by the explanation of feature avoided the repetition about described shielded type cable.
Fig. 1 a and Fig. 1 b illustrates perspective view according to the shielded type cable of the first embodiment of the present invention and cutaway view.
More specifically, Fig. 1 a is the perspective view of the shielded type cable illustrated according to the first embodiment of the present invention, and Fig. 1 b is the cutaway view of the shielded type cable illustrated according to the first embodiment of the present invention.
Shielded type cable 100 according to the first embodiment of the present invention comprises: core 10, wherein, is provided with multiple cable core 11; Electrostatic screen portion 40, is arranged on the periphery of core 10; Electromagnetic shielding portion 60, is arranged on the periphery in electrostatic screen portion 40, to allow induced current along helical trajectory flowing wherein; And covering part 70, be arranged on the periphery in electromagnetic shielding portion 60.
The core 10 of shielded type cable 100 according to a first embodiment of the present invention has for two-way communication signal or the cable core 11 for multiple band coatings of signal transmission in a particular direction.Should be understood that, ideally, comprise the cable for signal transmission in a particular direction according to the shielded type cable 100 of the first embodiment of the present invention, and for the cable of two-way communication.
Multiple cable cores 11 of core 10 have paired twisted-pair cable.
Film section 20 is arranged on the periphery of described core 10, forms film 21 (or thin slice) with the multiple cable cores 11 around core 10.
Film section 20 for compressing the multiple cable cores 11 stood in wherein, thus reduces the gap between cable core 11, and prevents foreign substance from entering core 10.
Internal jacket portion 30 is arranged on the periphery of film section 20, and with having the internal jacket component 31 of water-proof function.
Internal jacket component 31 is made up of polyethylene, and polyethylene is the cross-linked polymer compound that a kind of polymerization by ethene is formed.
The internal jacket portion 30 with internal jacket component 31 is thicker than film section 20, and internal jacket portion 30 has opaque dead color.
Electrostatic screen portion 40 as internal shield layer is arranged on the periphery in internal jacket portion 30.Electrostatic screen portion 40 is made up of low resistive metal, and more specifically, it comprises the electrostatic screen component 41 be made up of copper (Cu) of bellows fashion.
Electrostatic screen portion 40 as internal shield layer provides electrostatic screening effect according to electrostatic induction to core 10, and except low resistive metal copper, it also can be made up of aluminium (Al).In this case, aluminium can become the aluminium being coated with high-molecular coating.
Except the form with bellows, electrostatic screen portion 40 can also have the form of litzendraht wire (braiderwire).
External jacket portion 50 is arranged on the periphery in electrostatic screen portion 40, and has external jacket component 51.External jacket portion 50 is used for the electrostatic screen portion 40 as internal shield layer insulate with the following electromagnetic shielding portion 60 as exterior shield layer that will discuss and separate.
Identical with internal jacket component 31, the external jacket component 51 in external jacket portion 50 is also made up of polyethylene.
Electromagnetic shielding portion 60 is arranged on the periphery in external jacket portion 50.
If be set to parallel with high-voltage power line or electric railroad electric wire according to the shielded type cable 100 of the embodiment of the present invention, therefore, in order to reduce the induced current produced by electrostatic induction or electromagnetic induction from cable core widely, shielded type cable 100 provides the electrostatic screen portion 40 be made up of low resistive metal as internal shield layer be provided at its inner portion and the electromagnetic shielding portion 60 be made up of high-permeability material as exterior shield layer being arranged on its outside.
Magnetic permeability refers in a vacuum, when there being material to be magnetized under influence of magnetic field, and the ratio of the magnetic density produced and magnetizing field.General material, that is, the magnetic permeability of paramagnetic material and diamagnetic material is close to 1, and magnetic permeability value is determined based on the kind of material.In this case, ferrimagnet (such as iron) or ferrimagnetic material have sizable value, and these values can change along with the intensity of magnetizing history or magnetic field.Especially, alloy, as nickel steel (permalloy), Sendust (Fe-Si-Al alloy), ferrite (comprising the magnetic class ceramic material of tool of ferriferous oxide), silicon steel etc., there is very high magnetic permeability to show distinctive electrical characteristics and magnetic characteristic, therefore, it is used as the core body of permanent magnet or radio-frequency unit as high-permeability material.In contrast, copper and aluminium are the representative example of low magnetic permeability metal.
Electromagnetic shielding portion 60 as exterior shield layer is formed by usually there being the silicon strip of high magnetic permeability.Electromagnetic screen shield tape 60 is provided to the induced current reducing to be produced by the electromagnetic induction of the cable core 11 of core 10, to protect cable further.
Electromagnetic shielding portion 60 allows induced current helically to flow (will discuss after a while), and has the mask tape 61 as electromagnetic shielding member, which increases the operating efficiency when installing shielded type cable.
More specifically, the mask tape 61 with given width is wound onto in external jacket portion 50, and when shielded type cable 100 bends, it can be bent easily by the boundary line formed on the Width of mask tape 61, thus ensures excellent operating efficiency.
In addition, if the mask tape 61 formed as the electromagnetic shielding portion 60 of exterior shield layer is made up of high magnetic permeability metal, the magnetic field of noise is caused almost to gather mask tape 61 to cable core, there is destructive interference between the induced current generated causing the magnetic field of noise to cable core and the induced current produced by electrostatic shielding shield tape, thus reduce the impact of induced current for cable core.This high magnetic permeability metal is nickel steel (permalloy) or silicon steel.
This silicon steel is non-orientation silicon steel, and wherein the orientation in magnetic field is eliminated, and ideally, nickel steel has the nickel of weight fraction 50% to 80%.
If screen is made up of high-permeability material, usually, capability of electromagnetic shielding can improve, and can reduce the K (shielding factor) that can determine capability of electromagnetic shielding.
Shielding factor compares in the presence/absence of to the size of the induced electromotive force sensing cable core according to electromagnetic shielding portion 60, and shielding factor is determined by the following:
K (shielding factor)=E (sensing the induced current of cable core)/Eo (being applied to the input voltage of screen) or,
K (the shielding factor)=induced current of E'(when there is screen) induced current of/Eo'(when there is not screen)
K (shielding factor) is lower, and shielding properties is higher.
Magnetic permeability (μ 0) and inductance L have following relation, as shown in following first equation:
(the first equation), wherein, L is inductance, and Φ is total magnetic flux, and n is coil turn, and I is electric current, and B is magnetic flux density (magnetic flux density), and S is surface area, and H is magnetic field intensity.
As described above, electromagnetic shielding portion 60 as exterior shield layer is made up of high-permeability material, because capability of electromagnetic shielding is proportional to magnetic permeability (μ 0), in the first equation, the magnetic permeability (μ 0) of screen increases, and makes the inductance L being proportional to magnetic permeability (μ 0) increase (μ 0 ∝ L).
If the inductance of electro-magnetic screen layer (L) increases, correspondingly, capability of electromagnetic shielding improves, and the shielding factor of electro-magnetic screen layer reduces.
In order to improve the shielding properties of the mask tape 61 in electromagnetic shielding portion 60, therefore, shielded type cable 100 according to a first embodiment of the present invention adopts a kind of method of the inductance (L) for increasing the electromagnetic shielding portion 60 as exterior shield layer.
Generally speaking, the K (shielding factor) in electromagnetic shielding portion 60 is inversely proportional to the inductance (L) in electromagnetic induction portion 60, and in order to the K (shielding factor) reducing electromagnetic shielding portion 60, the mask tape 61 forming electromagnetic shielding portion 60 is made up of high-permeability material.In order to increase the inductance (L) in electromagnetic shielding portion 60 more, simultaneously, the induced current caused by mask tape 61 is not linearly flowing in the longitudinal direction of shielded type cable, but the track of stream curl, thus induce coil effect (coil effect).
In order to allow induced current helically to flow, the mask tape 61 forming electromagnetic shielding portion 60 is helically wound around on the periphery of outside sheath section 50, and is coated with insulating material.
That is, the mask tape 61 forming electromagnetic shielding portion 60 is coated with insulating material, then be helically wound around, induced current on outside screen is helically flowed, even if the mask tape 61 forming electromagnetic shielding portion 60 contacts with external jacket portion 50 in winding process, can be increased by the inductance of coil effect, K (shielding factor) is reduced.
The insulating coating being coated to the mask tape 61 forming electromagnetic shielding portion 60 becomes varnish coat (vanish coating) by the organic material with inorganic filler, and insulation coating layer thickness is more than 4 μm or 4 μm, verify that ideal situation is about 5 μm by experiment.
When the mask tape 61 forming electromagnetic shielding portion 60 has been coated with insulating material, the surface insulation resistance of insulating coating is between 30 Ω/cm
2to 50 Ω/cm
2scope in, verify by experiment, be desirably about 40 Ω/cm
2.
When direct voltage is applied to insulating material, substantially only have small electric current to flow through, meanwhile, the ratio of voltage and electric current represents insulation resistance.According to electric current be on insulating material surface or in insulating material internal flow, insulation resistance is divided into surface insulation resistance and volume insulation resistance, and in this case, effects on surface insulation resistance carries out the quality measuring to check insulating coating.
In the first embodiment of the present invention shown in Fig. 1 a and Fig. 1 b, more specifically, the shielding part 60 as exterior shield layer is made up of the mask tape 61 of individual layer.
As shown in the circle that Fig. 1 b amplifies, mask tape 61 has the insulating coating C be formed on two surface.
Even if during the helical wrapping process of mask tape 61 induced current come in contact or overlapping or do not produce gap (slit 62 formed time namely at spiral winding) at interval, the formation of insulating coating C still makes the induced current produced by electromagnetic induction flow in the longitudinal direction of mask tape 61.
Be different from Fig. 1 a and Fig. 1 b, namely, if be made up of the mask tape 61 of individual layer as the electromagnetic shielding portion 60 of exterior shield layer, mask tape 61 is helically wound around, not there is the gap at any interval, namely have and make gap 62 not be exposed to outside lap.
As illustrated in figs. ia and ib, if do not arrange insulating coating C, mask tape 61 is helically wound around to form slit 62, thus keeps state of insulation.
The first embodiment of the present invention as illustrated in figs. ia and ib, shows mask tape 61 and is helically wound around to form slit 62, meanwhile, allows the situation that insulating coating C is formed thereon.In this case, if insulating coating c is formed fully on two surfaces of mask tape 61, or be difficult to form insulating coating c thereon, the formation of slit 62 can prevent the insulation breakdown caused by the surface contact by bending and insulating tape.
Therefore, even if be arranged on mask tape 61 by insulating coating C, the gap at interval is formed to prevent mask tape 61 artificially and is had lap or contact portion.
Covering part 70 is arranged on the periphery in electromagnetic shielding portion 60.The cladding material 71 forming covering part 70 is formed by lead-free PVC or Halogen resin.
Fig. 2 a and Fig. 2 b is perspective view and the cutaway view of the shielded type cable illustrated according to a second embodiment of the present invention.
More specifically, Fig. 2 a illustrates the perspective view of shielded type cable according to a second embodiment of the present invention, Fig. 2 b illustrates the cutaway view of shielded type cable according to a second embodiment of the present invention, wherein, in order to describe for simplicity, can not again be described the part that the parts in Fig. 1 a and Fig. 1 b are described.
The mask tape in the electromagnetic shielding portion 60 as shown in Fig. 1 a and Fig. 1 b is used as electro-magnetic screen layer, serves as the rigid strength members for strengthening shielded type cable rigidity in addition.
In order to increase work efficiency and allow induced current helically to flow, the mask tape 61 in electromagnetic shielding portion 60 is helically wound around.
But, if mask tape 61 is helically wound around, effectiveness may because the wound portion of the mask tape 61 formed in each winding divide between interval gap (slit) and decline, correspondingly, electromagnetic shielding portion 60 can be made up of multiple shielding belt.
If electromagnetic shielding portion 60 is made up of multiple shielding belt, so when installing shielded type cable, operating efficiency does not reduce greatly, the inflow in the magnetic field by slit produced during spiral winding and outflow conductively-closed, thus optimizes magnetic field shielding effect.
The electromagnetic shielding portion 60 as exterior shield layer as shown in Fig. 2 a and Fig. 2 b comprises the first mask tape 61 and secondary shielding band 66, but can comprise three layers of mask tape.
Identical with the first embodiment of the present invention, electromagnetic shielding portion 60 as shown in Fig. 2 a and Fig. 2 b has at least one or two in the first mask tape 61 and secondary shielding band 66 being formed with insulating coating, to increase the inductance in electromagnetic shielding portion 60, and allow to sense that the induced current in electromagnetic shielding portion 60 helically flows.
In addition, first mask tape 61 can not apply over its entire surface with in secondary shielding band 66, but at least one in the outer surface of the first mask tape 61 and the inner surface of secondary shielding band 66 is coated to make inner surface and outer surface contact with each other.
In this case, if when all forming insulating coating on the outer surface of the first mask tape 61 and the inner surface of secondary shielding band 66, its thickness is less than the thickness when the coat that insulate is formed at least one surface.
The slit 62 formed during the first mask tape 61 spiral winding is covered by secondary shielding band 66, thus reduces the exposure to slit 62, and directly prevents inflow and the outflow in magnetic field.
In addition, the first mask tape 61 is helically wound around in internal jacket portion 30 according to priority with secondary shielding band 66.
As shown in Fig. 2 a and Fig. 2 b, if first mask tape 61 in electromagnetic shielding portion 60 is insulated from each other mutually by respective coating with secondary shielding band 66, be helically wound around independently of one another, they then act as independently induction coil simultaneously.Because these induction coils are stacked each other, therefore, the inductance in electromagnetic shielding portion 60 becomes the mask tape of the individual layer be greater than in the first embodiment of the present invention, thus significantly improves the capability of electromagnetic shielding of mask tape.
That is, these mask tapes only stack each other and any spiral winding do not occur, and insulated from each other, thus cause the coil effect and the inductance increasing electromagnetic shielding portion 60 with helical trajectory.
By the improvement of capability of electromagnetic shielding, the magnetic flux (induced current produces from magnetic field) in magnetic field gathers the electromagnetic shielding portion 60 by being formed not have the mode of slit to be wound around double-deck mask tape with maximum degree, the induced current caused by electromagnetic induction flows to the electrostatic screen portion 40 being arranged on inside, electromagnetic shielding portion 60, make, between the induced current generated by electromagnetic induction and induced current cable core 11 being produced to noise, destructive interference occurs, thus improve the capability of electromagnetic shielding of mask tape.
First mask tape 61 in the electromagnetic shielding portion 60 of the shielded type cable 100 as shown in Fig. 2 a and Fig. 2 b and secondary shielding band 66 are by steel plate materials, and such as, nickel steel, silicon steel, galvanized steel etc. forms.
Be positioned at the first mask tape 61 of inside, electromagnetic shielding portion 60 by nickel steel, silicon steel, and any one in galvanized steel is formed, and is positioned at the secondary shielding band 66 of outside, electromagnetic shielding portion 60 by nickel steel, silicon steel, and any one in galvanized steel is formed.First mask tape 61 and secondary shielding band 66 are made up of material mutually the same or different from each other.
If the first mask tape 61 is by high-permeability material, such as, there is the nickel steel (permalloy) of the nickel of 50% to 80% (weight fraction), or non-orientation silicon steel is formed, the secondary shielding band 66 being wrapped in the first outside, mask tape 61 is made up of etch-proof galvanized steel, by experiment, demonstrate it and there is excellent capability of electromagnetic shielding and Corrosion Protection.
But, except above-mentioned experimental result, find when the first mask tape 61 of steel plate type and secondary shielding band 66 are wound in bilayer with state insulated from each other, capability of electromagnetic shielding is more better than the capability of electromagnetic shielding when the first mask tape 61 of steel plate type and secondary shielding band 66 are wound around with state on-insulated each other.
Fig. 3 a and Fig. 3 b is perspective view and the cutaway view of the shielded type cable illustrated according to the third embodiment of the invention.
More specifically, Fig. 3 a is the perspective view of the shielded type cable illustrated according to the third embodiment of the invention, Fig. 3 b is the cutaway view of the shielded type cable illustrated according to the third embodiment of the invention, wherein, in order to describe for simplicity, will no longer be described the part illustrated in Fig. 1 a to Fig. 2 b.
Be different from Fig. 2 a and the second embodiment of the present invention shown in Fig. 2 b, the third embodiment of the present invention as illustrated in figures 3 a and 3b adopts a kind of method, wherein, the whole surface of at least one in first mask tape 61 and secondary shielding band 66 or contact surface do not apply insulating material, but insulating trip S is set between the first mask tape 61 and secondary shielding band 66, so that both are insulated from each other.
Namely, avoid insulating coating, the insulating trip S be made up of nonwoven fabrics or resin material is arranged between the first mask tape 61 and secondary shielding band 66.In electromagnetic shielding portion 60 winding process, insulating trip S can put into inserted mode, or invests the first mask tape 61 and the side contact surface of any one in secondary shielding band 62.
If during the winding process in electromagnetic shielding portion 60, insulating trip S places in the way to insert, insulating trip S is made up of resin sheet or resin film, thus strengthens water resistance, and to part therein carry out fastening with they are wound without any gap.
Generally speaking, electromagnetic shielding portion 60 as exterior shield layer has double-decker, and each screen is respectively with the first mask tape 61 of state winding separated in the longitudinal direction of shielded type cable 100 and secondary shielding band 66, and insulating trip S is inserted between the first mask tape 61 and secondary shielding band 66 simultaneously.
In this case, as as shown in Fig. 3 a and Fig. 3 b, insulating coating can be formed in reduce the possibility of insulation breakdown on the first mask tape 61 and secondary shielding band 66, but if the insulating reliability of insulating trip S exists, does not so just need to form insulating coating.
Fig. 4 a and Fig. 4 b is perspective view and the cutaway view of the shielded type cable illustrated according to a fourth embodiment of the invention.
More specifically, Fig. 4 a illustrates the perspective view of shielded type cable according to a fourth embodiment of the invention, and Fig. 4 b is the cutaway view of the shielded type cable illustrated according to a fourth embodiment of the invention, wherein, in order to describe for simplicity, will no longer be described the part illustrated in Fig. 1 a to Fig. 3 b.
Be different from the third embodiment of the present invention as illustrated in figures 3 a and 3b, the fourth embodiment of the present invention as shown in fig. 4a and fig. 4b does not adopt external jacket portion 50 and adopts the insulating trip S1 be made up of nonwoven fabrics or resin material in the mode identical with Fig. 3 a and Fig. 3 b, to be insulated with the electromagnetic shielding portion 60 as exterior shield layer in the electrostatic screen portion 40 as internal shield layer.
Removing of external jacket portion 50 makes the diameter of shielded type cable 100 greatly reduce, and in addition, is insulated in electrostatic screen portion 40 and electromagnetic shielding portion 60.
Except applying except insulating trip S1 to be insulated in electrostatic screen portion 40 and electromagnetic shielding portion 60, in addition, the inner surface of first mask tape 61 in electromagnetic shielding portion 60 also scribbles coating.
In addition, according to the fourth embodiment of the present invention as shown in fig. 4a and fig. 4b, between the first mask tape 61 that insulating trip S2 is provided in formation exterior shield layer and secondary shielding band 66, with by insulated from each other to the first mask tape 61 and secondary shielding band 66, in addition, insulating coating can be formed on the first mask tape 61 and secondary shielding band 66 to reduce the possibility of insulation breakdown.
The of the present invention second to the 4th embodiment as shown in Fig. 2 a to Fig. 4 b, there is the mask tape of the bilayer forming electromagnetic shielding portion 60, but only have when mask tape is three layers and is helically wound around with the state insulated between two, just can obtain the effect of the number increase producing faradic coil, thus greatly improve capability of electromagnetic shielding.
Fig. 5 is the curve chart of the shielding properties experiment of the shielded type cable illustrated according to a preferred embodiment of the invention.More specifically, in empirical curve as shown in Figure 5, the electromagnetic shielding portion 60 (the first mask tape 61) of the shielded type cable 100 as shown in Fig. 2 a and Fig. 2 b by high-permeability material (such as, there is the nickel steel (permalloy) of the nickel of 50% to 80% (weight fraction), or non-orientation silicon steel) form, the secondary shielding band 66 be wrapped on the outside of the first mask tape 61 is made up of etch-proof galvanized steel.In such a situa-tion, while input voltage Eo at the two ends of secondary shielding band 66 increases, internal measurement electromagnetic induction voltage E in electromagnetic shielding portion 60 is to measure K (shielding factor), wherein, K (shielding factor)=E (induced voltage)/Eo (input voltage).According to concrete experiment condition, input voltage (Eo, V/km) common shielded type cable A, conventional high voltage shielded cable B and changing according on the outermost screen of shielded type cable C of the present invention as shown in Fig. 2 a and Fig. 2 b, thus K (shielding factor) is measured.
When there is not the common shielded type cable A of any electro-magnetic screen layer, as input voltage (Eo, V/km) be low and when reaching high voltage 500V/km, shielding factor increases widely, cause checking out that the signal disturbing caused due to noise produces (wherein, K>0.15) in the inside of shielded type cable.When induced current is along the shielded type cable longitudinal flow of the high voltage shielded cable B of similar routine, shielded type cable B phase has more excellent shielding properties compared with shielded type cable A, but according to the high deviation that input voltage (Eo, V/km) obtains in shielding rate.If input voltage (Eo, V/km) at low-voltage region (Eo<70V/km), especially, the shielding properties of shielded type cable B is starkly lower than according to shielded type cable C of the present invention, thus checks out a lot of noises produced on cable core.
In addition, the shielding properties lower (K<0.05) of the electromagnetic performance of the shielded type cable B on the whole section of input voltage (Eo, V/km) compared with shielded type cable C of the present invention is checked out.
Namely, if shielded type cable C according to the present invention provides the electromagnetic shielding portion of insulating with electrostatic screen portion, wherein first mask tape with the inside, the electromagnetic shielding portion that is positioned at be made up of high magnetic permeability metal, electromagnetic shielding portion and the secondary shielding band of outside, the electromagnetic shielding portion that is positioned at that is made up of low magnetic permeability metal, first mask tape and secondary shielding band are helically wound around under state insulated from each other, make to ensure that the shielding properties corresponding below 0.05 or 0.05 with shielding rate in the scope that input voltage is 0V/km to 500V/km, and ensure that the shielding properties being installed to be and there is with high current electrical railway electric wire the shielded type cable for Signal transmissions of parallel relation.
Although with reference to specific exemplary embodiment, invention has been described, the present invention is not limited to described embodiment, but only limit by appended claims.Should be appreciated that those skilled in the art without departing from the scope and spirit of the present invention, can change embodiment or revise.
Claims (25)
1. a shielded type cable, comprising:
The cable core of multiple band coating;
Internal shield layer, forms with the periphery around described multiple cable core by metal material;
Exterior shield layer, forms with spirally around the periphery of described internal shield layer by metal material, and insulate with described internal shield layer; And
Cover layer, in order to the periphery around described exterior shield layer.
2. shielded type cable according to claim 1, wherein, described exterior shield layer is coated with insulating material.
3. shielded type cable according to claim 2, wherein, described exterior shield layer is the mask tape in order to the individual layer be wound around in the longitudinal direction of described shielded type cable, and if this mask tape is helically wound around, on described mask tape, so there is not the distance at interval or there is lap on described mask tape.
4. shielded type cable according to claim 1, wherein, described exterior shield layer is the mask tape of individual layer, if described mask tape is helically wound around, on described mask tape, so there is the distance at interval.
5. shielded type cable according to claim 1, wherein, described exterior shield layer has the mask tape of the bilayer be wound around with the distance at interval in the longitudinal direction of described shielded type cable, and at least one deck in described mask tape is coated with insulating material.
6. shielded type cable according to claim 1, wherein, described exterior shield layer has the mask tape of the bilayer be wound around with the distance at interval in the longitudinal direction of described shielded type cable, and is provided with insulating trip between described mask tape.
7. the shielded type cable according to claim 5 or 6, wherein, at least one deck in the described mask tape of described exterior shield layer is made up of any one in nickel steel and silicon steel.
8. shielded type cable according to claim 7, wherein, the described mask tape of the described exterior shield layer be made up of any one in nickel steel and silicon steel is arranged on the inside of described exterior shield layer, and another mask tape around the periphery of one deck mask tape is then made up of galvanized steel.
9. shielded type cable according to claim 7, wherein, described silicon steel is non-orientation silicon steel.
10. shielded type cable according to claim 7, wherein, described nickel steel contains the nickel that weight fraction is 50% to 80%.
11. mask tapes according to claim 3 or 4, wherein, the slit formed during the spiral winding of the internal shield band in the mask tape of the described bilayer of described exterior shield layer is covered by described external screen shield tape.
12. shielded type cables according to claim 2 or 5, wherein, described insulating coating is made up of varnish coat the organic material with inorganic filler, and thickness is more than 4 μm or 4 μm.
13. shielded type cables according to claim 12, wherein, described insulating coating has between 30 Ω/cm
2with 50 Ω/cm
2between surface insulation resistance.
14. 1 kinds of shielded type cables, comprising:
Core, described core has multiple cable core;
Electrostatic screen portion, forms with the periphery around described core by metal material;
Electromagnetic shielding portion, forms with around described electrostatic screen portion by metal material, and insulate with the described electrostatic screen portion having induced current spiral to flow out; And
Cover layer, described cover layer is in order to the periphery around described electromagnetic shielding portion.
15. shielded type cables according to claim 14, wherein, described electrostatic screen portion has double-decker, in described double-decker, internal shield band is made up of high-permeability material, external screen shield tape is made up of low magnetic permeability material, and described internal shield band and described external screen shield tape are helically wound around.
16. shielded type cables according to claim 14, wherein, described internal shield band is made up of non-orientation silicon steel.
17. shielded type cables according to claim 14, wherein, described internal shield band is made up of nickel steel, and described nickel steel contains the nickel of 50% to 80% weight fraction.
18. shielded type cables according to claim 15, wherein, in described electromagnetic shielding portion, the described internal shield band be made up of described high-permeability material and be coated with insulating material by any one in the described external screen shield tape that described low magnetic permeability material is formed.
19. shielded type cables according to claim 15, wherein, in described electromagnetic shielding portion, the described internal shield band be made up of described high-permeability material and be provided with insulating trip by between the described external screen shield tape that described low magnetic permeability material is formed.
20. shielded type cables according to claim 19, wherein, it is insulated from each other that described electrostatic screen portion and described electromagnetic shielding portion pass through insulating trip, wherein, the material forming described insulating trip with in order to by identical for the material of the described internal shield band in described electromagnetic shielding portion and described external screen shield tape insulating trip insulated from each other.
21. mask tapes according to claim 15, wherein, when the described external screen shield tape be made up of described low magnetic permeability material is helically wound around, the slit crested that the spiral winding institute compartment of terrain of the described internal shield band be made up of described high-permeability material in described electromagnetic shielding portion is formed.
22. 1 kinds of shielded type cables, comprising:
Multiple cable core;
Electrostatic screen portion, forms with around described cable core by metal material; And
Electromagnetic shielding portion, described electromagnetic shielding portion has the internal shield band be made up of high magnetic permeability metal material and the external screen shield tape be made up of low magnetic permeability metal material, and insulate in described electromagnetic shielding portion and described electrostatic screen portion, wherein, when described internal shield band and described external screen shield tape are helically wound around with state insulated from each other, according to the input voltage between 0V/km to 500V/km, shielding rate is less than 0.05 or 0.05.
23. shielded type cables according to claim 22, wherein, in described electromagnetic shielding portion, the described internal shield band be made up of described high magnetic permeability metal material and by any one in the described external screen shield tape that described low magnetic permeability metal material is formed be coated with insulating material with allow described internal shield band and described external screen shield tape insulated from each other, or, between described internal shield band and described external screen shield tape, insulating trip is set, with allow described internal shield band and described external screen shield tape insulated from each other.
24. shielded type cables according to claim 22, wherein, the bellows that described electrostatic screen portion is made of copper is formed.
25. shielded type cables according to claim 22, wherein, described electrostatic screen portion and described electromagnetic shielding portion insulated from each other by the sheath member be made up of polyethylene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710212586.1A CN106847394A (en) | 2012-11-13 | 2013-08-21 | Shielded cable |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2012-0127925 | 2012-11-13 | ||
| KR1020120127925A KR20140060941A (en) | 2012-11-13 | 2012-11-13 | Shield cable |
| PCT/KR2013/007501 WO2014077492A1 (en) | 2012-11-13 | 2013-08-21 | Shield cable |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710212586.1A Division CN106847394A (en) | 2012-11-13 | 2013-08-21 | Shielded cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104798145A true CN104798145A (en) | 2015-07-22 |
Family
ID=50731375
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710212586.1A Pending CN106847394A (en) | 2012-11-13 | 2013-08-21 | Shielded cable |
| CN201380059377.8A Pending CN104798145A (en) | 2012-11-13 | 2013-08-21 | Shield cable |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710212586.1A Pending CN106847394A (en) | 2012-11-13 | 2013-08-21 | Shielded cable |
Country Status (6)
| Country | Link |
|---|---|
| KR (1) | KR20140060941A (en) |
| CN (2) | CN106847394A (en) |
| AU (1) | AU2013345687B2 (en) |
| PH (1) | PH12015500993A1 (en) |
| SG (1) | SG11201503641PA (en) |
| WO (1) | WO2014077492A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105047277A (en) * | 2015-08-20 | 2015-11-11 | 国网山东省电力公司临沂供电公司 | Water-tree-resistant low-voltage insulating cable |
| CN110709946A (en) * | 2017-05-31 | 2020-01-17 | Ls电线有限公司 | Intermediate connection system of ultra-high voltage direct current power cable |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102380328B1 (en) * | 2015-06-30 | 2022-03-30 | 엘에스전선 주식회사 | Superconducting cable |
| US10186350B2 (en) | 2016-07-26 | 2019-01-22 | General Cable Technologies Corporation | Cable having shielding tape with conductive shielding segments |
| CN106847418A (en) * | 2016-12-28 | 2017-06-13 | 江苏戴普科技有限公司 | The track traffic preparation technology of fire-retardant four pairs of Shielded Twisted Pairs |
| CN106828199B (en) * | 2017-03-30 | 2023-03-17 | 北京全路通信信号研究设计院集团有限公司 | Cable anti-interference system for electrified railway section |
| CN108735396B (en) * | 2018-06-05 | 2020-12-11 | 浙江正泰电缆有限公司 | Double-strip winding process |
| EP3582235B1 (en) | 2018-06-14 | 2023-12-20 | General Cable Technologies Corporation | Cable having shielding tape with conductive shielding segments |
| KR20230032044A (en) | 2021-08-30 | 2023-03-07 | 엘에스전선 주식회사 | Shield cable for electric railway |
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- 2013-08-21 AU AU2013345687A patent/AU2013345687B2/en active Active
- 2013-08-21 CN CN201710212586.1A patent/CN106847394A/en active Pending
- 2013-08-21 WO PCT/KR2013/007501 patent/WO2014077492A1/en active Application Filing
- 2013-08-21 CN CN201380059377.8A patent/CN104798145A/en active Pending
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2015
- 2015-05-05 PH PH12015500993A patent/PH12015500993A1/en unknown
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| CN105047277A (en) * | 2015-08-20 | 2015-11-11 | 国网山东省电力公司临沂供电公司 | Water-tree-resistant low-voltage insulating cable |
| CN110709946A (en) * | 2017-05-31 | 2020-01-17 | Ls电线有限公司 | Intermediate connection system of ultra-high voltage direct current power cable |
| CN110709946B (en) * | 2017-05-31 | 2021-01-29 | Ls电线有限公司 | Intermediate connection system of ultra-high voltage direct current power cable |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2013345687B2 (en) | 2016-08-25 |
| PH12015500993B1 (en) | 2015-07-27 |
| KR20140060941A (en) | 2014-05-21 |
| PH12015500993A1 (en) | 2015-07-27 |
| CN106847394A (en) | 2017-06-13 |
| WO2014077492A1 (en) | 2014-05-22 |
| SG11201503641PA (en) | 2015-06-29 |
| AU2013345687A1 (en) | 2015-05-28 |
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