CN103811128A - High-current-carrying power cable - Google Patents
High-current-carrying power cable Download PDFInfo
- Publication number
- CN103811128A CN103811128A CN201410083592.8A CN201410083592A CN103811128A CN 103811128 A CN103811128 A CN 103811128A CN 201410083592 A CN201410083592 A CN 201410083592A CN 103811128 A CN103811128 A CN 103811128A
- Authority
- CN
- China
- Prior art keywords
- layer
- spiral layer
- power cable
- metal path
- outer spiral
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000010410 layer Substances 0.000 claims abstract description 111
- 239000002184 metal Substances 0.000 claims abstract description 45
- 239000011241 protective layer Substances 0.000 claims abstract description 7
- 230000004888 barrier function Effects 0.000 claims description 17
- 238000005520 cutting process Methods 0.000 claims description 16
- 230000006698 induction Effects 0.000 claims description 9
- 238000009413 insulation Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 238000007654 immersion Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 239000002966 varnish Substances 0.000 claims description 3
- 230000005855 radiation Effects 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- -1 screen Substances 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
Images
Classifications
-
- 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
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/14—Insulating conductors or cables by extrusion
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/14—Insulating conductors or cables by extrusion
- H01B13/143—Insulating conductors or cables by extrusion with a special opening of the extrusion head
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/16—Insulating conductors or cables by passing through or dipping in a liquid bath; by spraying
- H01B13/165—Insulating conductors or cables by passing through or dipping in a liquid bath; by spraying by spraying
-
- 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
- H01B9/024—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients composed of braided metal wire
Abstract
The invention provides a high-current-carrying power cable. The power cable comprises a cable core, an inner insulating layer, a shielding layer and a protective layer from inside to outside, wherein the shielding layer is partitioned into three layers, namely, an inner spiral layer, an isolating film and an outer spiral layer respectively from inside to outside; the surfaces of the inner spiral layer and the outer spiral layer are provided with straight spiral metal paths; insulating gaps are formed between adjacent coils of the straight spiral metal paths; insulating gaps on the metal path of the inner spiral layer are just over against the metal path of the outer spiral layer in the radial direction. The power cable has a good shielding function, is small in eddy current loss, and is suitable for high-current-carrying operation.
Description
Technical field
The present invention relates to electric wire field, especially, relate to a kind of large current-carrying power cable.
Background technology
In power cable field, particularly for the electric wire with information spreading function, in order to prevent extraneous interference, also in order to suppress the radiation leakage of core, conventionally all need to wrap up in the outside of core at least one deck metal screen layer; By the setting of screen, can effectively prevent that outside environmental electromagnetic wave from having influence on the current signal in core, also reduced alternating current in core to external radiation.
This kind of screen mainly contains two kinds, and a kind of is the silk screen being interwoven by wire, and another kind is tubular metal thin-walled; In fact,, for woven wire, be also equivalent to the tubular metal thin-walled that surface is covered with through hole.
For above-mentioned screen, the subject matter of existence is, the alternating current in core will go out vortex flow at screen surface induction, due to the existence of this kind of vortex flow, the ampacity of electric wire will be limited by very large, and ampacity is larger, and eddy current loss is larger; Therefore, current shielding wire, in current-carrying process, line loss is larger.
Summary of the invention
For the problems referred to above, the object of the present invention is to provide a kind of large current-carrying power cable, this power cable not only has good shielding action, and has less eddy current loss, is applicable to large current-carrying operation.
The technical solution adopted for the present invention to solve the technical problems is: this power cable comprises core, inner insulating layer, screen, protective layer from the inside to the outside; Described screen is divided into three layers, is respectively from the inside to the outside interior spiral layer, barrier film, outer spiral layer; Described interior spiral layer, outer spiral layer surface have and are straight spiral metal path, between the adjacent turn of this straight spiral metal path, there is clearance for insulation, insulation space between the metal path of described interior spiral layer, in the lucky metal path to described outer spiral layer just in the radial direction.
As preferably, just there is a conductive contact surfaces on described interior spiral layer, outer spiral layer surface every a segment distance, and described conductive contact surfaces corresponding on each interior spiral layer, outer spiral layer is in contact with one another by the cut on described barrier film; Thereby induced electromotive force that produced separately, that have identical Direction of circulation on interior spiral layer, outer spiral layer is cancelled out each other, and the small vortex flow that this has further eliminated on spiral metal path, further reduces the line loss of electric wire.
As preferably, described barrier film is made up of insulating varnish, and its thickness is 0.2mm ~ 0.5mm, makes interior spiral layer, outer spiral layer keep nearer distance, equates thereby induced electromotive force on interior spiral layer, outer spiral layer is close to.
As preferably, on described outer spiral layer, the width of each circle of metal path is slightly larger than the width of each circle of metal path on interior spiral layer, thereby make the electric induction ability of metal path on outer spiral layer a little more than interior spiral layer, to make up outer spiral layer off-line core difference far away.
The present invention also provides a kind of manufacture method of described power cable, and this manufacture method comprises the steps:
One, make core by the feed reservoir of the described inner insulating layer under molten condition, and extrude via extruder, form the electric wire being formed by core, inner insulating layer;
Two,, in the mode such as sputter, spraying, coat layer of metal film on described inner insulating layer surface;
Three, adopt lathe by pulling wire direct join continuous rotation, then adopt the cutting knife with certain width along electric wire continuous walking, thereby cut out spiral metal path, form described interior spiral layer;
Four,, to apply or the mode of oil immersion, form described barrier film described interior spiral layer is outside;
Five, imitate step 2, three, form described outer spiral layer in described barrier film appearance;
Six, the electric wire that makes to comprise core, inner insulating layer, screen is by the feed reservoir of the described protective layer under molten condition, and extrudes via extruder, forms described large current-carrying power cable.
As preferably, in step 3, be provided with stress induction sheet for the tool-holder of cutting knife described in clamping, it is to sense the radial force of cutting knife that the installation site of described stress induction sheet requires; And described tool-holder give the cutter degree of depth by electrical module control, described electrical module according to the radial force of described cutting knife regulate described tool-holder give the cutter degree of depth, make the radial force of cutting knife remain constant.
Beneficial effect of the present invention is: this large current-carrying power cable is in the time of current-carrying, the radiation producing on the arbitrfary point of core, in radially described in directive when spiral layer, metal path by interior spiral layer is caught, continue outwards projection, metal path by outer spiral layer is caught, thereby cannot be again to outside environmental radiation; Equally, the interference signal of external environment condition also cannot enter core; And after being caught by the metal path of described interior spiral layer or outer spiral layer, because metal path is wire substantially, there is no large-area continuous surface, therefore, the generation of eddy current is greatly limited, and only has small eddy current at interior spiral layer and outer spiral layer surface; This has improved the current capacity of electric wire to a great extent.
Accompanying drawing explanation
Fig. 1 is the cross sectional representation of this large current-carrying power cable.
Fig. 2 is the partial enlarged drawing of I part in Fig. 1.
Fig. 3 is in this large current-carrying power cable, the contrast schematic diagram of an embodiment of interior spiral layer, outer spiral layer.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described:
As shown in Figure 1 and Figure 2, this power cable comprises core 1, inner insulating layer 2, screen 3, protective layer 4 from the inside to the outside.
Described screen 3 is divided into three layers, is respectively from the inside to the outside interior spiral layer 31, barrier film 30, outer spiral layer 32; Described interior spiral layer 31, outer spiral layer 32 surfaces have and are straight spiral metal path, between the adjacent turn of this straight spiral metal path, have clearance for insulation; As shown in Figure 3, the insulation space 310 between the metal path 311 of described interior spiral layer 31, in the lucky metal path 321 to described outer spiral layer 32 just in the radial direction; Equally, the insulation space 320 between the metal path 321 of described outer spiral layer 32, in the lucky metal path 311 to described interior spiral layer 31 just in the radial direction.
Described barrier film 30 is made up of insulating varnish, and its thickness is 0.2mm ~ 0.5mm, makes interior spiral layer 31, outer spiral layer 32 keep nearer distance, thereby makes the induced electromotive force on interior spiral layer 31, outer spiral layer 32 be close to equal.
Above-mentioned large current-carrying power cable is in the time of current-carrying, the radiation producing on the arbitrfary point of core 1, in radially described in directive when spiral layer 31, metal path 311 by interior spiral layer 31 is caught, continue outwards projection, metal path 321 by outer spiral layer 32 is caught, thereby cannot be again to outside environmental radiation; Equally, the interference signal of external environment condition also cannot enter core 1; And after being caught by the metal path 311,321 of described interior spiral layer 31 or outer spiral layer 32, because metal path is wire substantially, there is no large-area continuous surface, therefore, the generation of eddy current is greatly limited, and only has small eddy current at interior spiral layer and outer spiral layer surface; This has improved the current capacity of electric wire to a great extent.
In addition, in the embodiment shown in fig. 3, just there is a conductive contact surfaces 312,322 on described interior spiral layer 31, outer spiral layer 32 surfaces every a segment distance, and described conductive contact surfaces corresponding on each interior spiral layer 31, outer spiral layer 32 is in contact with one another by the cut on described barrier film 30; Thereby make induced electromotive force that produced separately, that there is identical Direction of circulation on interior spiral layer 31, outer spiral layer 32, as Fig. 3 bend arrow is illustrated, cancel out each other, the small vortex flow that this has further eliminated on spiral metal path, further reduces the line loss of electric wire.
For above-mentioned power cable, its manufacture can be carried out in accordance with the following steps:
One, make core by the feed reservoir of the described inner insulating layer under molten condition, and extrude via extruder, form the electric wire being formed by core, inner insulating layer;
Two,, in the mode such as sputter, spraying, coat layer of metal film on described inner insulating layer surface;
Three, adopt lathe by pulling wire direct join continuous rotation, then adopt the cutting knife with certain width along electric wire continuous walking, thereby cut out spiral metal path, form described interior spiral layer;
Four,, to apply or the mode of oil immersion, form described barrier film 30 described interior spiral layer is outside; And, in the place corresponding to described conductive contact surfaces 312,322, break barrier film 30, form cut;
Five, imitate step 2, three, form described outer spiral layer in described barrier film appearance;
Six, the electric wire that makes to comprise core, inner insulating layer, screen is by the feed reservoir of the described protective layer under molten condition, and extrudes via extruder, forms described large current-carrying power cable.
In addition, consider that wire body is flexible, even if it is stretching, it is tightened, in the time that its surface is cut, be also difficult to, as rigid body, make wire body consistency; Therefore, stress induction sheet can be set on the tool-holder for cutting knife described in clamping, it is to sense the radial force of cutting knife that the installation site of described stress induction sheet requires; And described tool-holder give the cutter degree of depth by electrical module control, described electrical module according to the radial force of described cutting knife regulate described tool-holder give the cutter degree of depth, make the radial force of cutting knife remain constant; Like this, because interior spiral layer, the destroyed required radial pressure of outer spiral layer metal film on surface are basicly stable, even if electric wire deformation, destroy this required radial pressure of metal film also substantially constant, therefore, by stress induction sheet and controlled tool-holder, can ensure that metal film is subject to reliable cutting, described inner insulating layer, barrier film are unaffected.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (6)
1. a large current-carrying power cable, this power cable comprises core (1), inner insulating layer (2), screen (3), protective layer (4) from the inside to the outside; It is characterized in that: described screen (3) is divided into three layers, be respectively from the inside to the outside interior spiral layer (31), barrier film (30), outer spiral layer (32); Described interior spiral layer (31), outer spiral layer (32) surface have and are straight spiral metal path (311,321), between the adjacent turn of this straight spiral metal path, there is clearance for insulation (310,320), insulation space (310) between the metal path of described interior spiral layer, in the lucky metal path to described outer spiral layer (321) just in the radial direction.
2. large current-carrying power cable according to claim 1, it is characterized in that: just there is a conductive contact surfaces (312,322) on described interior spiral layer (31), outer spiral layer (32) surface every a segment distance, each interior spiral layer (31), the upper corresponding described conductive contact surfaces (312,322) of outer spiral layer (32) are in contact with one another by the cut on described barrier film (30).
3. large current-carrying power cable according to claim 1 and 2, is characterized in that: described barrier film (30) is made up of insulating varnish, its thickness is 0.2mm ~ 0.5mm.
4. large current-carrying power cable according to claim 3, is characterized in that: the width of upper each circle of metal path (321) of described outer spiral layer (32) is slightly larger than the width of upper each circle of metal path (311) of interior spiral layer (31).
5. a manufacture method for power cable claimed in claim 1, is characterized in that: this manufacture method comprises the steps:
One, make core by the feed reservoir of the described inner insulating layer under molten condition, and extrude via extruder, form the electric wire being formed by core, inner insulating layer;
Two,, in the mode such as sputter, spraying, coat layer of metal film on described inner insulating layer surface;
Three, adopt lathe by pulling wire direct join continuous rotation, then adopt the cutting knife with certain width along electric wire continuous walking, thereby cut out spiral metal path, form described interior spiral layer;
Four,, to apply or the mode of oil immersion, form described barrier film described interior spiral layer is outside;
Five, imitate step 2, three, form described outer spiral layer in described barrier film appearance;
Six, the electric wire that makes to comprise core, inner insulating layer, screen is by the feed reservoir of the described protective layer under molten condition, and extrudes via extruder, forms described large current-carrying power cable.
6. manufacture method according to claim 5, in step 3, is provided with stress induction sheet for the tool-holder of cutting knife described in clamping, and it is to sense the radial force of cutting knife that the installation site of described stress induction sheet requires; And described tool-holder give the cutter degree of depth by electrical module control, described electrical module according to the radial force of described cutting knife regulate described tool-holder give the cutter degree of depth, make the radial force of cutting knife remain constant.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610114374.5A CN105551673B (en) | 2014-03-10 | 2014-03-10 | Manufacturing method of heavy current-carrying power cable |
| CN201610025820.5A CN105609201B (en) | 2014-03-10 | 2014-03-10 | Big current-carrying power line manufacture method |
| CN201410083592.8A CN103811128B (en) | 2014-03-10 | 2014-03-10 | Large current-carrying power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410083592.8A CN103811128B (en) | 2014-03-10 | 2014-03-10 | Large current-carrying power cable |
Related Child Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610025820.5A Division CN105609201B (en) | 2014-03-10 | 2014-03-10 | Big current-carrying power line manufacture method |
| CN201610114374.5A Division CN105551673B (en) | 2014-03-10 | 2014-03-10 | Manufacturing method of heavy current-carrying power cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103811128A true CN103811128A (en) | 2014-05-21 |
| CN103811128B CN103811128B (en) | 2016-04-20 |
Family
ID=50707774
Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610114374.5A Expired - Fee Related CN105551673B (en) | 2014-03-10 | 2014-03-10 | Manufacturing method of heavy current-carrying power cable |
| CN201610025820.5A Active CN105609201B (en) | 2014-03-10 | 2014-03-10 | Big current-carrying power line manufacture method |
| CN201410083592.8A Expired - Fee Related CN103811128B (en) | 2014-03-10 | 2014-03-10 | Large current-carrying power cable |
Family Applications Before (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610114374.5A Expired - Fee Related CN105551673B (en) | 2014-03-10 | 2014-03-10 | Manufacturing method of heavy current-carrying power cable |
| CN201610025820.5A Active CN105609201B (en) | 2014-03-10 | 2014-03-10 | Big current-carrying power line manufacture method |
Country Status (1)
| Country | Link |
|---|---|
| CN (3) | CN105551673B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106816210A (en) * | 2016-12-05 | 2017-06-09 | 国网江苏省电力公司盐城供电公司 | A kind of power cable |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2284995Y (en) * | 1996-08-14 | 1998-06-24 | 鸿海精密工业股份有限公司 | Cable conductor |
| CN101950619A (en) * | 2010-09-03 | 2011-01-19 | 宁波东方电缆股份有限公司 | Hybrid armored structure of single-core high-voltage submarine cable |
| CN102034567A (en) * | 2009-10-05 | 2011-04-27 | 日立电线株式会社 | Shielded cable |
| CN203232719U (en) * | 2013-03-05 | 2013-10-09 | 合肥市深朝电子有限公司 | High efficiency wrap resistance shielding wire |
| CN103456401A (en) * | 2013-08-29 | 2013-12-18 | 常州苏控自动化设备有限公司 | Cable special for frequency changer |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL6916724A (en) * | 1968-11-14 | 1970-05-19 | ||
| GB9204917D0 (en) * | 1992-03-06 | 1992-04-22 | Spiro Machines Sa | Apparatus for cutting helically wound metal tubing |
| JP2006107769A (en) * | 2004-09-30 | 2006-04-20 | Showa Electric Wire & Cable Co Ltd | Manufacturing device of shielded cable |
| CN102280193B (en) * | 2011-08-16 | 2013-09-11 | 安徽滨江电缆股份有限公司 | Cable with high current-carrying capacity |
-
2014
- 2014-03-10 CN CN201610114374.5A patent/CN105551673B/en not_active Expired - Fee Related
- 2014-03-10 CN CN201610025820.5A patent/CN105609201B/en active Active
- 2014-03-10 CN CN201410083592.8A patent/CN103811128B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2284995Y (en) * | 1996-08-14 | 1998-06-24 | 鸿海精密工业股份有限公司 | Cable conductor |
| CN102034567A (en) * | 2009-10-05 | 2011-04-27 | 日立电线株式会社 | Shielded cable |
| CN101950619A (en) * | 2010-09-03 | 2011-01-19 | 宁波东方电缆股份有限公司 | Hybrid armored structure of single-core high-voltage submarine cable |
| CN203232719U (en) * | 2013-03-05 | 2013-10-09 | 合肥市深朝电子有限公司 | High efficiency wrap resistance shielding wire |
| CN103456401A (en) * | 2013-08-29 | 2013-12-18 | 常州苏控自动化设备有限公司 | Cable special for frequency changer |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106816210A (en) * | 2016-12-05 | 2017-06-09 | 国网江苏省电力公司盐城供电公司 | A kind of power cable |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105551673B (en) | 2017-04-26 |
| CN105609201B (en) | 2017-07-14 |
| CN103811128B (en) | 2016-04-20 |
| CN105609201A (en) | 2016-05-25 |
| CN105551673A (en) | 2016-05-04 |
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Effective date of registration: 20160222 Address after: 518000 Guangdong city of Shenzhen province Futian District Fuhua Road No. 6 Building 1403 business tax Applicant after: Liu Chao Address before: Ping Wang Zhen Wujiang District of Suzhou city in Jiangsu province to 215200 Road No. 59 Experimental Primary School Applicant before: Zhong Xingying |
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| CB03 | Change of inventor or designer information |
Inventor after: He Qing Inventor after: Li Qingqing Inventor after: Zhang Min Inventor after: Wang Jian Inventor after: Zhang Jie Inventor before: Zhong Xingying |
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Effective date of registration: 20160331 Address after: 100000 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant after: State Grid Corporation of China Applicant after: STATE GRID JIANGXI ELECTRIC POWER COMPANY Applicant after: Jiujiang power supply branch of Guo Wang Jiangxi Electric Power Corporation Address before: 518000 Guangdong city of Shenzhen province Futian District Fuhua Road No. 6 Building 1403 business tax Applicant before: Liu Chao |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20160420 Termination date: 20170310 |