CN207529716U - A kind of power cable - Google Patents
A kind of power cable Download PDFInfo
- Publication number
- CN207529716U CN207529716U CN201721751833.7U CN201721751833U CN207529716U CN 207529716 U CN207529716 U CN 207529716U CN 201721751833 U CN201721751833 U CN 201721751833U CN 207529716 U CN207529716 U CN 207529716U
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- Prior art keywords
- magnetosphere
- power cable
- layer
- insulating film
- insulation
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- 239000010410 layer Substances 0.000 claims abstract description 65
- 239000004020 conductor Substances 0.000 claims abstract description 33
- 238000009413 insulation Methods 0.000 claims abstract description 25
- 229910052751 metal Inorganic materials 0.000 claims abstract description 10
- 239000002184 metal Substances 0.000 claims abstract description 10
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000012792 core layer Substances 0.000 claims abstract description 9
- -1 polyethylene Polymers 0.000 claims description 8
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 6
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 239000004698 Polyethylene Substances 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 229920000573 polyethylene Polymers 0.000 claims description 4
- 229920003020 cross-linked polyethylene Polymers 0.000 claims description 2
- 239000004703 cross-linked polyethylene Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 2
- 239000004800 polyvinyl chloride Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 14
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 6
- 230000004907 flux Effects 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 239000011241 protective layer Substances 0.000 description 6
- 230000005611 electricity Effects 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 239000006247 magnetic powder Substances 0.000 description 4
- 230000001052 transient effect Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000012795 verification Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000000356 contaminant Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
Abstract
The utility model discloses a kind of power cables, it should include aluminium core layer (1), conductor shield (2), first magnetosphere (3), insulating film (4), second magnetosphere (5), insulating layer (6), insulation screen (7), metal screen layer (8), oversheath (9), and aluminium core layer (1), conductor shield (2), first magnetosphere (3), insulating film (4), second magnetosphere (5), insulating layer (6), insulation screen (7), metal screen layer (8), oversheath (9) is sequentially distributed from inside to outside, wherein magnetosphere is by the first magnetosphere (3), insulating film (4), second magnetosphere (5) forms, it is characterized in that the thickness of the second magnetosphere (5) is 1.3 1.8 times of the first magnetosphere (3).
Description
Technical field
The utility model belongs to the technical field of cable, and in particular to a kind of power cable.
Background technology
Power cable is the cable for being used for transmission and distributing electric energy, and power cable is usually used in Urban Underground power grid, power station
Lead line, industrial and mining enterprises' in-line power and mistake river sea submarine transmission line.In power circuit, cable proportion just gradually increases
Add.Power cable is to transmit and distribute the cable product of high-power power in the basic routing line of electric system, including 1-
500KV and any of the above voltage class, the power cable of various insulation.
The use of power cable has over one hundred year history so far, thus its application in field of power transmission ten has been divided into
Ripe and universal, relevant novel power cable is constantly improved also with corresponding application scenarios and innovation.General electric power electricity
The basic structure of cable is made of core (conductor), insulating layer, shielded layer and four part of protective layer：Core, core are power cables
Current-carrying part, be the major part of power cable for conveying electric energy；Insulating layer, insulating layer be by core with the earth and
It is being electrically isolated from each other between out of phase core, is ensureing electrical energy transportation, be indispensable composition portion in power cable structure
Point；Shielded layer, 15KV and more than power cable generally have conductor shield and insulation screen；Protective layer, protective layer
Effect is to protect power cable from the intrusion of introduced contaminants and moisture and prevent external force from directly damaging power cable.
In recent years, power cable line increases sharply in China's urban distribution network, system capacitive current is caused to increased dramatically.
When single-phase earthing occurs for system, the earth current of Earth Phase is the summation of the capacitive earth current of non-faulting phase.When capacitance electricity
When stream is more than 10A, ground arc cannot reliably extinguish, and will generate following consequence：(1) single-phase earthing electric arc occurs intermittent
Extinguish and restrike, generate arc grounding over-voltage, form breakdown in insulation weakness, the insulation of electrical equipment is caused greatly
Harm.(2) sustained arc causes the dissociation of air, destroys the insulation of surrounding air, phase fault easily occurs.(3) it generates
Ferro-resonance over-voltage easily burns out voltage transformer and the damage of arrester is caused even to make Explosion of on Arrester.It can thus be appreciated that
Conventional power cable capacitance current crosses conference and brings hidden danger to power grid security.
Invention content
In order to solve the problems, such as that the conventional power cable capacitance current that appeal is mentioned is excessive, applicant is to conventional power cable
Bold innovative design has been carried out, has devised a kind of novel high-inductance power cable, so as to eliminate power cable from source
Capacitance current, solve the problems, such as conventional power cable well.
To realize the above-mentioned technical purpose, this application provides following technical solutions：
A kind of power cable, including aluminium core layer 1, conductor shield 2, the first magnetosphere 3, insulating film 4, the second magnetosphere 5,
Insulating layer 6, insulation screen 7, metal screen layer 8, oversheath 9, and aluminium core layer 1, conductor shield 2, the first magnetosphere 3, absolutely
Velum 4, the second magnetosphere 5, insulating layer 6, insulation screen 7, metal screen layer 8, oversheath 9 are sequentially distributed from inside to outside,
The thickness for being characterized in that the second magnetosphere 5 is 1.3-1.8 times of the first magnetosphere 3.
Further, conductor shield 2 is semiconductive polyethylene；First magnetosphere 3 and the second magnetosphere 5 are with Magnaglo
Based on form；Insulating layer 6 is crosslinked polyethylene；Insulation screen 7 is semiconductive polyethylene；Metal screen layer 8 is copper strips；Outer shield
Set 9 is polyvinyl chloride.
Further, the number of insulating film is N number of, and N number of insulating film is uniformly by magnetosphere decile.
Further, the number of insulating film is N number of, and N number of insulating film is non-uniform separates magnetosphere for this.
Further, insulating film is formed for polytetrafluoroethylene material.
The power cable obtained by above-mentioned design disclosure satisfy that the main technique requirements of conventional power cable, and to electricity
Other performances of power cable do not influence substantially, the unit length inductance value of power cable up to 2-10 times of conventional power cable,
And the insulation performance of power cable is not influenced, the application power cable capacitance per unit length value is smaller than conventional electric power power cable,
Its capacitance current reduces 10%-20% than conventional power cable, therefore can solve electric in urban power distribution network and power network
The problem of power cable capacitance electric current is too big.
Description of the drawings
Fig. 1 is is the utility model structure diagram.
In figure：1, aluminium core layer, 2, conductor shield, 3, the first magnetosphere, 4, insulating film, 5, the second magnetosphere, 6, insulation
Layer, 7, insulation screen, 8, metal screen layer, 9, oversheath.
Specific embodiment
The utility model is described further with specific embodiment below in conjunction with attached drawing, but the utility model is not only
It is limited to detailed description below.
The basic structure of existing power cable is made of core (conductor), insulating layer, shielded layer and four part of protective layer：
Core, core is the current-carrying part of power cable, is the major part of power cable for conveying electric energy；Insulating layer, insulating layer
It is that will be electrically isolated from each other between core and the earth and out of phase core, ensures electrical energy transportation, be power cable structure
In indispensable component part；Shielded layer, 15KV and more than power cable generally have conductor shield and insulation shielding
Layer；Protective layer, the effect of protective layer are to protect power cable from the intrusion of introduced contaminants and moisture and prevent external force direct
Damage power cable.
Specific embodiment one
Applicant a kind of can carry larger inductance based on being provided the problem of security risk existing for existing cable
Power cable, the cross section of novel power cable that description above attached drawing is designed for applicant understand electric power with reference to the accompanying drawings
Cable, including aluminium core layer 1, conductor shield 2, the first magnetosphere 3, insulating film 4, the second magnetosphere 5, insulating layer 6, insulation shielding
Layer 7, metal screen layer 8, this several layers of composition of oversheath 9, relative to the prior art, the application focus on be provided with the first magnetic
Property layer 3, the second magnetosphere 5 and as the insulating film 4 among two magnetospheres.
It is magnetospheric to there is the magnetic conductivity for increasing conductor cores periphery medium, improve the magnetic conductivity of conductor cores periphery medium
Can, increase power cable inductance value, so as to solve the problems, such as existing cable.
Magnetospheric main component is magnetic powder particle, can be passed through after uniformly being mixed with the particle of insulating properties by magnetic powder particle
High temperature adhesives form, and the threshold value of inductance in power cable can be greatly turned up in magnetospheric addition.
Magnetospheric addition is also what is be worthy of careful study, is obtained through largely testing and simulating, magnetic blow out coating is added in conductor screen
It covers that effect between layer and insulating layer is best, can reach neither to destroy the insulation performance of insulating layer and do not destroy conductor shield and prevent
The only effect of bubble-discharge.
The good result of magnetospheric power cable is added for verification, applicant calculates novel power cable
And simulating, verifying.
The calculating of inductance, the inductance of cable are the magnetic flux that cable conductor is interlinked and the ratio of conductor current.In order to just
In calculating, inductance can be divided into interior inductance and external inductance component.Interior inductance is that the magnetic flux of conductor interlinkage is formed
Inductance, external inductance are then the inductance that the magnetic flux to interlink outside conductor is formed.
In order to facilitate the power cable that introduction above designs, referred to as novel electric power electric power, not have with traditional
The power cable of layer of being magnetic mutually distinguishes, and the magnetospheric power cable that has of applicant's design does not have magnetic with traditional
Property layer power cable compare, using MATLAB softwares establish 10kV power cable lines lumped parameter emulate mould
As a result type is shown：
The inductance value of novel power cable is bigger than conventional power cable, and capacitance is smaller than conventional power cable；Novel electric power
Cable capacitance electric current is smaller than conventional power cable by 14.69%, the transient state capacitance current of novel power cable Single-phase Ground Connection Failure
Peak value is significantly less than conventional power cable, therefore novel power cable can inhibit singlephase earth fault in cable run well
The transient state capacitance current of point, alternating current are largely flowed through in conductive surface, it was demonstrated that the presence of kelvin effect, and Novel electric
The current density ratio conventional power cable of power cable conductor outer wall is small；The eddy-current loss ratio of copper strip shielding layer in novel power cable
Conventional power cable is small, and reason is that novel power cable increases magnetic blow out coating than conventional power cable；Therefore novel electric power electricity
The kelvin effect and eddy-current loss of cable are all smaller than conventional power cable, can effectively reduce the effective resistance of power cable core
And power attenuation.
In addition apply improving magnetospheric performance, it is proposed that the magnetosphere is set as two layers namely first
Magnetosphere 3, the second magnetosphere 5, single magnetosphere can realize the effect for improving inductance threshold value to a certain extent, and applicant also sends out
It is now set as two layers when by magnetosphere, when two layers of magnetosphere is separated with insulating film, based on magnetospheric function unit length
Inductance value can be increased with exponentially.
Insulating film preferably uses organic insulating film polytetrafluoroethylene (PTFE) or inorganic insulation film aluminium oxide.
The discovery of applicant's actual verification is when the second magnetospheric thickness is 1.3-1.8 times of the first magnetic layer thickness, base
Behave oneself best in magnetospheric function unit length inductance value, preferably when the second magnetospheric thickness is the first magnetic layer thickness
1.55 times of effects it is the most prominent.
Specific embodiment two
Applicant a kind of can carry larger inductance based on being provided the problem of security risk existing for existing cable
Power cable, the cross section of novel power cable that description above attached drawing is designed for applicant understand electric power with reference to the accompanying drawings
Cable, including aluminium core layer 1, conductor shield 2, the first magnetosphere 3, insulating film 4, the second magnetosphere 5, insulating layer 6, insulation shielding
Layer 7, metal screen layer 8, this several layers of composition of oversheath 9, relative to the prior art, the application focus on be provided with the first magnetic
Property layer 3, the second magnetosphere 5 and as the insulating film 4 among two magnetospheres.
It is magnetospheric to there is the magnetic conductivity for increasing conductor cores periphery medium, improve the magnetic conductivity of conductor cores periphery medium
Can, increase power cable inductance value, so as to solve the problems, such as existing cable.
Magnetospheric main component is magnetic powder particle, can be passed through after uniformly being mixed with the particle of insulating properties by magnetic powder particle
High temperature adhesives form, and the threshold value of inductance in power cable can be greatly turned up in magnetospheric addition.
Magnetospheric addition is also what is be worthy of careful study, is obtained through largely testing and simulating, magnetic blow out coating is added in conductor screen
It covers that effect between layer and insulating layer is best, can reach neither to destroy the insulation performance of insulating layer and do not destroy conductor shield and prevent
The only effect of bubble-discharge.
The good result of magnetospheric power cable is added for verification, applicant calculates novel power cable
And simulating, verifying.
The calculating of inductance, the inductance of cable are the magnetic flux that cable conductor is interlinked and the ratio of conductor current.In order to just
In calculating, inductance can be divided into interior inductance and external inductance component.Interior inductance is that the magnetic flux of conductor interlinkage is formed
Inductance, external inductance are then the inductance that the magnetic flux to interlink outside conductor is formed.
In order to facilitate the power cable that introduction above designs, referred to as novel electric power electric power, not have with traditional
The power cable of layer of being magnetic mutually distinguishes, and the magnetospheric power cable that has of applicant's design does not have magnetic with traditional
Property layer power cable compare, using MATLAB softwares establish 10kV power cable lines lumped parameter emulate mould
As a result type is shown：
The inductance value of novel power cable is bigger than conventional power cable, and capacitance is smaller than conventional power cable；Novel electric power
Cable capacitance electric current is smaller than conventional power cable by 14.69%, the transient state capacitance current of novel power cable Single-phase Ground Connection Failure
Peak value is significantly less than conventional power cable, therefore novel power cable can inhibit singlephase earth fault in cable run well
The transient state capacitance current of point, alternating current are largely flowed through in conductive surface, it was demonstrated that the presence of kelvin effect, and Novel electric
The current density ratio conventional power cable of power cable conductor outer wall is small；The eddy-current loss ratio of copper strip shielding layer in novel power cable
Conventional power cable is small, and reason is that novel power cable increases magnetic blow out coating than conventional power cable；Therefore novel electric power electricity
The kelvin effect and eddy-current loss of cable are all smaller than conventional power cable, can effectively reduce the effective resistance of power cable core
And power attenuation.
In addition apply improving magnetospheric performance, it is proposed that the magnetosphere is set as two layers namely first
Magnetosphere 3, the second magnetosphere 5, single magnetosphere can realize the effect for improving inductance threshold value to a certain extent, and applicant also sends out
It is now set as two layers when by magnetosphere, when two layers of magnetosphere is separated with insulating film, based on magnetospheric function unit length
Inductance value can be increased with exponentially.
Further it is have several insulating films to separate the first magnetosphere and the second magnetosphere in embodiment 2, this is absolutely
Velum can be uniformly by the first magnetosphere and the uniform decile of the second magnetosphere or it is non-uniform separate, at this time
The number of insulating film is N number of (N is positive integer), and preferably when N is equal to 3, the first magnetosphere and the second magnetosphere are divided into 4
Layer, and this 4 layers thickness ratio is 1:2:3:2:When 1, the effect of the power cable is best.
Insulating film preferably uses organic insulating film polytetrafluoroethylene (PTFE) or inorganic insulation film aluminium oxide.
The above content is the further descriptions made with reference to specific preferred embodiment to the utility model, it is impossible to recognize
The specific implementation for determining the utility model is confined to these explanations, for the ordinary skill people of the utility model technical field
For member, without departing from the concept of the premise utility, several simple deduction or replace can also be made, should be all considered as
Belong to the protection domain that claims that the utility model is submitted determine.
Claims (5)
1. a kind of power cable, including aluminium core layer (1), conductor shield (2), the first magnetosphere (3), insulating film (4), the second magnetic
Property layer (5), insulating layer (6), insulation screen (7), metal screen layer (8), oversheath (9), and aluminium core layer (1), conductor shielding
Layer (2), the first magnetosphere (3), insulating film (4), the second magnetosphere (5), insulating layer (6), insulation screen (7), metallic shield
Layer (8), oversheath (9) are sequentially distributed from inside to outside, and wherein magnetosphere is by the first magnetosphere (3), and insulating film (4), second is magnetic
Layer (5) composition, it is characterised in that the thickness of the second magnetosphere (5) is 1.3-1.8 times of the first magnetosphere (3).
2. a kind of power cable according to claim 1, it is characterised in that：Conductor shield (2) is semiconductive polyethylene；
First magnetosphere (3) and the second magnetosphere (5) are using Magnaglo as main component；Insulating layer (6) is crosslinked polyethylene；Insulation screen
Layer (7) is covered for semiconductive polyethylene；Metal screen layer (8) is copper strips；Oversheath (9) is polyvinyl chloride.
3. a kind of power cable according to claim 1, it is characterised in that：The number of insulating film is N number of, N number of insulation
Film is uniformly by magnetosphere decile.
4. a kind of power cable according to claim 1, it is characterised in that：The number of insulating film is N number of, N number of insulation
Film is non-uniform to separate magnetosphere.
5. a kind of power cable according to claim 2, it is characterised in that：Insulating film is formed for polytetrafluoroethylene material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721751833.7U CN207529716U (en) | 2017-12-15 | 2017-12-15 | A kind of power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721751833.7U CN207529716U (en) | 2017-12-15 | 2017-12-15 | A kind of power cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207529716U true CN207529716U (en) | 2018-06-22 |
Family
ID=62578415
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721751833.7U Expired - Fee Related CN207529716U (en) | 2017-12-15 | 2017-12-15 | A kind of power cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207529716U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114171293A (en) * | 2020-09-10 | 2022-03-11 | 北京小米移动软件有限公司 | Coil assembly and terminal |
-
2017
- 2017-12-15 CN CN201721751833.7U patent/CN207529716U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114171293A (en) * | 2020-09-10 | 2022-03-11 | 北京小米移动软件有限公司 | Coil assembly and terminal |
| CN114171293B (en) * | 2020-09-10 | 2024-04-23 | 北京小米移动软件有限公司 | Coil assembly and terminal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180622 Termination date: 20181215 |