CN1542877A - A winding cable capable of reducing loss - Google Patents
A winding cable capable of reducing loss Download PDFInfo
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- CN1542877A CN1542877A CNA031183360A CN03118336A CN1542877A CN 1542877 A CN1542877 A CN 1542877A CN A031183360 A CNA031183360 A CN A031183360A CN 03118336 A CN03118336 A CN 03118336A CN 1542877 A CN1542877 A CN 1542877A
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Abstract
This invention relates to a winding cable including a conductor 1, an internal semiconductor layer 2, an insulation layer 3, and an outside semiconductor layer 4 characterizing in applying insulation separation among conducting layers formed by twisting the conductors, adding a conducting belt 5 to the outside of the linking to the earth directly. The winding cable can particularly reduce heat generated from the cable due to the influence of the outside magnetic field and connect to the earth effectively. This invented product can be used as the windings of transformers and reactors instead of traditional oil transformers isolated by oil- paper and dried ones cast by epoxy resin.
Description
Technical field
The invention belongs to the power cable technical field, relate to a kind of winding cable that reduces the wastage.
Background technology
In traditional power transformer, generally adopt the square-section lead, the shape of this lead makes non-uniform electric, and is more concentrated in its edges and corners field intensity, easily has electric hidden danger.Simultaneously for the eddy current loss in the winding is reduced, must adopt the mode of transposition along the lead of winding short transverse, so that magnetic field that lead is received is even, therefore this transformer device structure will be tending towards complexity.In addition, also need take measures to improve Electric Field Distribution and prevent partial discharge, simultaneously, further eliminate of the influence of the control electric field of conventional electric power transformer, one of problem of the key when also being design grounded parts at winding overhang.
Conventional cable conductor adopts that multi-core conductor is stranded to form more, and its conductor is because need earlier prefabricated copper bar is processed into filament through the copper big drawing machine, and then through stranded technology, the conductor manufacturing is just finished.But the winding cable that adopts this conductor is during as the winding of transformer, reactor etc., and its loss is very big, simultaneously because a large amount of heats that conductor produces have quickened the aging of insulation, thereby reduces the life-span of winding cable.
Summary of the invention
Technology technical problem to be solved by this invention is that a kind of winding cable that reduces the wastage will be provided, this winding cable can reduce the very big heat that makes the winding cable generation owing to the influence of external magnetic field, and this winding cable can carry out effective ground connection, can be used as transformer, the winding of the oil-immersed type transformer of the paper oil insulation that the winding use of reactor etc. is alternative traditional and the dry-type transformer of poured with epoxy resin, adopt the transformer of cable winding coiling not need to resemble traditional oil-immersed type transformer simultaneously and carry out periodic maintenance, its high pressure output can reach the 500kV level for the dry-type transformer of poured with epoxy resin, and adopts existing poured with epoxy resin technology to be difficult to realize.
The technical scheme that solution the utility model technical problem is adopted is that this winding cable that can reduce the wastage comprises conductor (1), interior semi-conductive layer (2), insulating barrier (3), outer semiconducting layer (4), adopt conductor layer insulation (6) to isolate between conductor layer and the conductor layer, the conductive strips (5) that installed additional outside cable outer semiconducting layer (4), conductive strips (5) are ground connection directly.The present invention is in the conductor design of winding cable, adopt layering to handle to conductor, between conductor layer, installed layer insulation additional, according to sectional area require again through stranded, install technology such as insulation additional and be made into the conductor wire core that replaces by strand and multi-core conductor and layer insulation, outer semiconducting layer and insulating barrier constitute the cable winding cable in squeezing into then.
Description of drawings
The present invention is described in further detail below in conjunction with the embodiment accompanying drawing.
Fig. 1 radially schemes for the winding cable that the present invention can reduce the wastage
The winding cable axial view that Fig. 2 can reduce the wastage for the present invention
Among the figure: semi-conductive layer, 3-insulating barrier, 4-outer semiconducting layer in 1-conductor, the 2-, 5-conductive strips 6-conductor layer insulation
Embodiment
The present invention compares with traditional product, and lead also is to play the transmission current effect.Conductor (1) adopts regular stranded forming by many copper or aluminum steel single conductor.Conductor is concentric laminar usually, and a centre drift is arranged, and around it multilayer concentric layer is arranged, and 6,12,18,24,30,36 and 42 lines are arranged usually.Conductor adopts hierarchy, contains conductor layer insulation (6) between conductor layer and the conductor layer, and the effect of conductor layer insulation (6) makes adjacent conductor layer and conductor layer mutually insulated.The conductor layer insulation makes between conductor layer and conductor layer to be separated mutually, and conductor layer insulation (6) can be born 10 volts of above alternating voltages at least, and in certain length range, can not mutual conduction between conductor layer and the layer.This structure just can reduce the conductor wire core formation eddy current still less that makes winding cable owing to the influence of external magnetic field as transformer, reactor, realizes reducing the effect of eddy current loss.The polymer insulation plastics that extrude between conductor layer, wrapped polymer insulation band, cable paper, temperature at 150～200 ℃, under 5～10 minutes the condition of time remaining, its physical property as: hot extension, shrinkage, heat ageing, elongation at break etc. can not change a lot, simultaneously, under this temperature conditions, chemical change does not take place in insulating material yet, and this winding cable is 70～90 ℃ a temperature in the long-term work temperature, and its performance can not change yet.
For the production of conductor wire core insulation, can adopt present " three-layer co-extruded " technology, even interior semi-conductive layer, insulating barrier, outer semiconducting layer is disposable extrudes.Select different can select upright tower production line of existing production line or catenary suspension type continuous vulcanization production line to improve reliability of products with the cross-sectional sizes of different electric pressures, conductor.
Conductor (1) can form by stranded conductor is stranded, and the outermost layer twisted wire in the rope-lay strand has at least a monofilament closely to contact with outer semiconducting layer (4), thereby avoids forming floating potential, quickens the aging of polymer.Interior semi-conductive layer (2) is coated on outside the conductor (1), and its effect is metallic bur power or the damage of wedge angle to insulating that reduces or eliminate conductor, and simultaneously, interior semi-conductive layer surface should be smooth, do not have obvious streakline and burr.Directly adopt the interior semi-conductive layer that extrudes for the small bore conductor.Nominal cross 500mm
2And above cable can adopt semi-conductive tape wrapped and extrude the mode that constitutes jointly of conductive layer; Interior semi-conductive layer and conductor wire core are equipotentials, so the air gap between them is not subjected to effect of electric field, the physical property of interior semi-conductive layer can make the three closely combine between conductor and insulating barrier, have reduced air gap and have produced the possibility of discharge.Outer semiconducting layer (4) is coated on outside the insulating barrier (3), plays the protection insulation and avoids extraneous damage.Have the homogenizing electric field simultaneously for semi-conductive layer, the accidental burr projection that forms is shielded from the semi-conductive layer shielding, prevent that electric field is concentrated; The physical property of outer semiconducting layer is between conductor and insulating barrier, and the two closely combines, and has reduced the possibility of bubble-discharge.Interior semi-conductive layer, outer semiconducting layer material are that the form that adds a spot of carbon black and metal dust or molecule is therein evenly mixed adding with base materials such as LDPE (low density polyethylene (LDPE)), HDPE (high density polyethylene (HDPE)), PP (polypropylene), PB (polybutene), PMP (polymethylpentene), XLPE (crosslinked polyethylene), EPR (ethylene-propylene rubber) or silicon rubber.
Interior semi-conductive layer, outer semiconducting layer extrude thickness at 0.5～1.0mm.The resistivity of the interior semi-conductive layer (2) of winding cable should be 10
-1～10
6In the scope of Ω .cm, be preferably 1～500 Ω .cm or best 10～200 Ω .cm, the resistivity of outer semiconducting layer (4) should be 10
-1～10
6In the scope of Ω .cm, be preferably 1～500 Ω .cm, be preferably 10～100 Ω .cm.Also have certain heat-blocking action for interior semi-conductive layer (2), outer semiconducting layer (4), can prevent since the loss of when operation produces overheated make insulation accelerated aging.
Insulating barrier (3) is squeezed to cooperate with relevant interpolation by LDPE (low density polyethylene (LDPE)), HDPE (high density polyethylene (HDPE)), PP (polypropylene), PB (polybutene), PMP (polymethylpentene), XLPE (crosslinked polyethylene), EPR (ethylene-propylene rubber) or silicon rubber etc. and forms.
Conductive strips (5) are wrapped outside outer semiconducting layer, it is zero that later its ground connection of winding technique makes its current potential, has the elimination tangential component simultaneously, prevent that insulating surface from producing gliding spark discharge, windings such as transformer, reactor have been solved simultaneously at the complicated problem with grounding that exists usually, installed the thin conductive strips of sparse coiling additional at outermost layer, conductive strips just can be used for direct ground connection.
The sectional area of conductor (1) is in 25～3000mm
2Scope in, the interior semi-conductive layer (2) of winding cable, outer semiconducting layer (4), insulating barrier (3) are made by polymer, it has identical elastic modulus E, E is less than 500MPa, preferably E is less than 200Mpa.Conductor (1), interior semi-conductive layer (2), outer semiconducting layer (4), insulating barrier (3), conductive strips (5) must have certain bendability, and the bending radius of winding cable is 8～12 times of winding cable radius.
In traditional power transformer, generally adopt the square-section lead, the shape of this lead makes non-uniform electric, and field intensity is very high at the Qi Sijiao place.In order to make eddy current loss in the winding reduce to minimum, must replace along the short transverse lead of winding, so it makes structure just be tending towards complicated.In addition, also should take some measures at winding overhang and to improve Electric Field Distribution and prevent partial discharge, simultaneously, a very crucial problem when further eliminating the traditional transformer design needs to consider to control the various measures of electric field to the ground connection component affects exactly.
Because the winding cable inner wire has adopted circular cross-section, according to the Maxwell equation, the electric field that the round conductor of winding cable is set up is equally distributed.For this drum type brake winding, its electric field is confined to winding inside fully, and is therefore all different with traditional dry-type transformer and oil-filled transformer, do not need to control the electric field of end winding region.The cable conductor of circular winding does not exist the roundlet angle as the strip conductor limiting maximum local field strength, has overcome the restriction of many aspects of Electric Field Distribution aspect in the present traditional power transformer design.
Because the cable outside has outer semiconducting layer to make it keep earth potential, so electric field just is confined to the inside at cable fully, this just provides a kind of brand-new electrical design and structural design for transformer manufacturing firm, for traditional transformer, promptly to consider the electrical design of electromagnetism and the possibility of structural design, consider electromagnetic field again, temperature and mechanical force, and to consider influencing each other between them, so the electrical design of conventional electric power transformer and structural design generally are more complicated, but when electric field is confined to the inside of cable fully, between the winding and winding is equidistant over the ground can handle respectively, only need consider how to guarantee the required space of cooling fully during design.
The calutrons such as transformer of this winding cable manufacturing will be applied in the existing electrical network, and its power can be from several VA to 10000MVA, higher voltage more than rated voltage reaches from 3-4kV to the 500kV level.
[example 1]
The winding cable of RZYJ-8.7/10kV 1*120, we adopt polyester belt as the conductor layer insulation in design, and conductor structure selects 37/2.15.In actual production, insulation thickness is designed to 0.3mm between the ground floor conductor layer, and insulation thickness is designed to 0.5mm between second layer conductor layer, and insulation thickness is designed to 0.5mm between the 3rd layer of conductor layer, adopts layering to press structure.
Insulating material adopts the YJ-10 crosslinkable polyethylene.
Near the material of 10 Ω .cm, the composition of this material is at normal temperatures for interior semi-conductive layer, outer semiconducting layer material selection specific insulation:
Component content (percentage by weight)
The polymer 60-79.5% of 2-ethyl acrylate and ethene
Carbon black 20-40%
Two [(tert-butyl peroxide) isopropyl] benzene 0.2-2.0%
1,2-dihydro-2,2,4-trimethyl quinoline polymer 0.2-2.0%
Ethyl acrylate 0.0001-0.0010%
The outer semiconducting layer of winding cable is dredged around the silver-plated copper strips of oxidation outward.
By dielectric voltage withstand test between conductor layer, its each layer all can reach the above designing requirement of the withstand voltage 10V of interlayer.The partial discharge quantity of this winding cable is below 1Pc simultaneously, and other performance index have reached designing requirement.
[example 2]
The winding cable of RZYJ-8.7/10kV 1*120, we adopt the polyimides band as the conductor layer insulation in design, and conductor structure selects 37/2.15.In actual production, insulation thickness is designed to 0.3mm between the ground floor conductor layer, and insulation thickness is designed to 0.5mm between second layer conductor layer, and insulation thickness is designed to 0.5mm between the 3rd layer of conductor layer, adopts layering to press structure.Insulating material adopts the YJ-10 crosslinkable polyethylene, interior semi-conductive layer material, outer semiconducting layer material selection specific insulation are at normal temperatures near the material of 10 Ω .cm, the composition of this material is: near the material of 10 Ω .cm, the composition of this material is at normal temperatures for interior semi-conductive layer, outer semiconducting layer material selection specific insulation:
Component content (percentage by weight)
The polymer 60-79.5% of 2-ethyl acrylate and ethene
Carbon black 20-40%
Two [(tert-butyl peroxide) isopropyl] benzene 0.2-2.0%
1,2-dihydro-2,2,4-trimethyl quinoline polymer 0.2-2.0%
Ethyl acrylate 0.0001-0.0010%
The outer semiconducting layer of winding cable is dredged around the silver-plated copper strips of oxidation outward.
By dielectric voltage withstand test between conductor layer, its each layer all can reach the above designing requirement of the withstand voltage 10V of interlayer.The partial discharge quantity of this winding cable is below 1Pc simultaneously, and other performance index have reached designing requirement.
Claims (10)
1, a kind of winding cable that reduces the wastage, comprise conductor (1), interior semi-conductive layer (2), insulating barrier (3), outer semiconducting layer (4), it is characterized in that by adopting conductor layer insulation (6) to isolate between stranded conductor layer that forms of conductor (1) and the conductor layer, installed conductive strips (5) outside cable outer semiconducting layer (4) additional, conductive strips (5) are used for direct ground connection.
2, the winding cable that reduces the wastage according to claim 1, it is characterized in that conductor (1) adopts regular stranded forming by many copper or aluminum steel or alloy lead wire single conductor, conductor (1) can form by stranded conductor is stranded, and the outermost layer twisted wire in the rope-lay strand can have at least a monofilament closely to contact with outer semiconducting layer (4).Conductor (1) is concentric laminar usually to be arranged, and a central conductor is arranged, and around it multilayer concentric layer is arranged, and to skin, every layer increases progressively 6 conductors than internal layer usually, can be 6,12,18,24,30,36 and 42 conductors successively from internal layer; Being coated on outer interior semi-conductive layer (2) surface of conductor (1) should be smooth, can directly adopt the semi-conductive layer that extrudes, nominal cross 500mm for the small bore conductor
2And its interior semiconductive screen layer mode that constitutes jointly that can adopt the semiconductive band and extrude conductive layer of above cable, interior semi-conductive layer and conductor wire core are equipotentials, air gap between them is not subjected to effect of electric field, the physical property of interior semi-conductive layer (2) is between conductor (1) and insulating barrier (3), the three closely combines, and reduces because air gap produces discharge; The physical property that is coated on the outer outer semiconducting layer (4) of insulating barrier (3) is between conductor and insulating barrier, and the two closely combines insulating barrier (3) and outer semiconducting layer (4), reduces because air gap produces discharge; Conductive strips (5) are wrapped outside outer semiconducting layer (4), be in the winding technique process at the thin conductive strips of the sparse coiling of outermost layer, conductive strips just can be used for direct ground connection, conductive strips (5) can be divided into plurality of sections, realize respectively ground connection of multiple spot.
3, the winding cable that reduces the wastage according to claim 1 and 2, it is characterized in that conductor layer insulation (6) is the part of conductor wire core, employing extrudes the polymer insulation plastics, wrapped polymer insulation band, cable paper, the polymer insulation plastics that extrude between conductor layer, wrapped polymer insulation band, cable paper, temperature at 150～200 ℃, under the condition of 5～10 minutes duration, its physical property as: heat is extended, shrinkage, heat ageing, elongation at break can not change a lot, simultaneously, under this temperature conditions, chemical change does not take place in insulating material, it in the long-term work temperature 70～90 ℃ temperature, the polymer insulation plastics that extrude between conductor layer, wrapped polymer insulation band, the performance of cable paper can not change, conductor layer insulation (6) can be born 10 volts of above alternating voltages at least, and in certain length range, can not mutual conduction between conductor layer and the layer.
4, the winding cable that reduces the wastage according to claim 1 and 2, it is characterized in that interior semi-conductive layer (2), outer semiconducting layer (4) adopt and have certain heat-blocking action, can prevent from overheatedly to make insulation accelerated aging material because loss produces during operation.
5, the winding cable that reduces the wastage according to claim 1 and 2, it is characterized in that interior semi-conductive layer (2), outer semiconducting layer (4) material be with LDPE or HDPE or PP or PB or or PMP or XLPE or or EPR or silicon rubber be base material, the form that adds a spot of carbon black and metal dust or molecule is therein evenly mixed adding, interior semi-conductive layer (2), outer semiconducting layer (4) extrude thickness at 0.5～1.0mm, insulating barrier (3) adopt LDPE or HDPE or PP or PB or or PMP or XLPE or or EPR or silicon rubber and relevant additive cooperation form.
6, the winding cable that reduces the wastage according to claim 1 and 2, the interior semi-conductive layer (2), insulating barrier (3), the outer semiconducting layer (4) that it is characterized in that winding cable have identical or close thermal coefficient of expansion, and it is Copper Foil, aluminium foil or semiconductive material and Copper Foil, aluminium foil composite strip that conductive strips (5) can adopt copper strips or aluminium strip or platinum band or base material.
7, the winding cable that reduces the wastage according to claim 1 and 2 is characterized in that the sectional area of conductor (1) is in 20～3000mm
2Scope in, and the external diameter of cable is between 20～250mm.
8, the winding cable that reduces the wastage according to claim 1 and 2, it is characterized in that winding cable interior semi-conductive layer (2), outer semiconducting layer extrude thickness at 0.5～1.0mm, the resistivity of the interior semi-conductive layer (2) of winding cable should be 10
-1～10
6In the scope of Ω .cm, be preferably 1～500 Ω .cm or best 10～200 Ω .cm, the resistivity of outer semiconducting layer (4) should be 10
-1～10
6In the scope of Ω .cm, be preferably 10～100 Ω .cm.
9, the winding cable that reduces the wastage according to claim 1 and 2, the interior semi-conductive layer (2), outer semiconducting layer (4), the insulating barrier (3) that it is characterized in that winding cable are made by polymer, it has identical elastic modulus E, and E is less than 500MPa, and preferably E is less than 200Mpa.
10, the winding cable that reduces the wastage according to claim 1 and 2, it is characterized in that conductor (1), interior semi-conductive layer (2), outer semiconducting layer (4), insulating barrier (3), conductive strips (5) have certain bendability, the bending radius of winding cable is 8～12 times of winding cable radius.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031183360A CN1542877A (en) | 2003-04-29 | 2003-04-29 | A winding cable capable of reducing loss |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031183360A CN1542877A (en) | 2003-04-29 | 2003-04-29 | A winding cable capable of reducing loss |
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| Publication Number | Publication Date |
|---|---|
| CN1542877A true CN1542877A (en) | 2004-11-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA031183360A Pending CN1542877A (en) | 2003-04-29 | 2003-04-29 | A winding cable capable of reducing loss |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102074316A (en) * | 2010-12-24 | 2011-05-25 | 领亚电子科技股份有限公司 | Electric wire and cable jacket extrusion and belting synchronization method and equipment for implementing same |
| CN101409118B (en) * | 2007-08-31 | 2013-09-25 | 埃塞克斯欧洲公司 | Electrically conductive wire and method for its manufacture |
| CN103680699A (en) * | 2012-09-25 | 2014-03-26 | 尼克桑斯公司 | Silicone multilayer insulation for electric cable |
| CN103730205A (en) * | 2012-10-10 | 2014-04-16 | 四川金信石信息技术有限公司 | Power cable with loss reduction function |
| CN109346231A (en) * | 2018-10-08 | 2019-02-15 | 郑州云海信息技术有限公司 | A kind of cable for eliminating electromagnetic interference |
| CN110164602A (en) * | 2019-05-31 | 2019-08-23 | 芜湖航天特种电缆厂股份有限公司 | A kind of high pressure resistant low-impedance cable and preparation method thereof |
| CN110380174A (en) * | 2019-07-16 | 2019-10-25 | 芜湖航天特种电缆厂股份有限公司 | Low impedance pulse coaxial radio frequency cable and preparation method thereof |
-
2003
- 2003-04-29 CN CNA031183360A patent/CN1542877A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101409118B (en) * | 2007-08-31 | 2013-09-25 | 埃塞克斯欧洲公司 | Electrically conductive wire and method for its manufacture |
| CN102074316A (en) * | 2010-12-24 | 2011-05-25 | 领亚电子科技股份有限公司 | Electric wire and cable jacket extrusion and belting synchronization method and equipment for implementing same |
| CN102074316B (en) * | 2010-12-24 | 2012-07-11 | 领亚电子科技股份有限公司 | Electric wire and cable jacket extrusion and belting synchronization method and equipment for implementing same |
| CN103680699A (en) * | 2012-09-25 | 2014-03-26 | 尼克桑斯公司 | Silicone multilayer insulation for electric cable |
| CN103680699B (en) * | 2012-09-25 | 2018-03-20 | 尼克桑斯公司 | Silicon multilevel insulator for cable |
| CN103730205A (en) * | 2012-10-10 | 2014-04-16 | 四川金信石信息技术有限公司 | Power cable with loss reduction function |
| CN109346231A (en) * | 2018-10-08 | 2019-02-15 | 郑州云海信息技术有限公司 | A kind of cable for eliminating electromagnetic interference |
| CN110164602A (en) * | 2019-05-31 | 2019-08-23 | 芜湖航天特种电缆厂股份有限公司 | A kind of high pressure resistant low-impedance cable and preparation method thereof |
| CN110380174A (en) * | 2019-07-16 | 2019-10-25 | 芜湖航天特种电缆厂股份有限公司 | Low impedance pulse coaxial radio frequency cable and preparation method thereof |
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