CN100365738C - Medium voltage winding cable for electric generator, motor and transformer - Google Patents

Medium voltage winding cable for electric generator, motor and transformer Download PDF

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Publication number
CN100365738C
CN100365738C CNB2005100236000A CN200510023600A CN100365738C CN 100365738 C CN100365738 C CN 100365738C CN B2005100236000 A CNB2005100236000 A CN B2005100236000A CN 200510023600 A CN200510023600 A CN 200510023600A CN 100365738 C CN100365738 C CN 100365738C
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parts
conductor
conductive
insulation
cable
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CN1652261A (en
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张秀松
吴祥明
刘旌平
季世泽
黄靖宇
王佩龙
毛伟杰
曾纪刚
田义龙
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Tongji University
Shanghai Electric Cable Research Institute
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Shanghai Maglev Transportation Engineering Technology Research Center
Shanghai Electric Cable Research Institute
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Abstract

The present invention relates to a high soft rubber insulation medium voltage cable which belongs to novel electric material. The present invention can be used as a winding cable for electric generators, motors (particularly linear motors) and transformers and is composed of a conductor (6), a conductor screen (7), an insulating component (8), an insulation screen (9), a conductive protecting sleeve (10) and a conductive coating (11).

Description

Press winding cable in a kind of
Technical field
The present invention relates to a kind of rubber-covered midium voltage cable of highly-flexible, belong to novel electrical material.The present invention can be used as the winding cable of generator, motor (particularly linear motor), transformer.
Background technology
100 of generator, motor and transformer for many years adopts the enamelled wire winding always.In recent years, motor, generator and transformer begin with power cable as winding.The winding of this new ideas has been released high-voltage generator (Powerformer TM), wind power generation system (Windformer TM) and novel transformer (Dfyformer TM) wait a series of New-type electric machines that good development prospect is arranged, make also that the novel high speed track traffic---magnetic suspension train becomes possibility.
Mostly the cable of using as generator, motor and Transformer Winding at present is cross-linked polyethylene insulated cable, and this cable is made up of conductor, conductor screen, insulation and insulation shielding.This cable is owing to adopt crosslinked polyethylene as insulation, and flexibility is not enough, the bending diameter of cable about 20 times to the outside diameter of cable, use limitation bigger, and do not have the protection of metallic shield and sheath, cable machinery intensity difference.
U.S. Pat 4,785,138 have related to a kind of rubber-covered winding cable.This construction of cable such as Fig. 1 are made of conductor 1, conductor screen 2, insulation 3, insulation shielding 4 and conductive jacket 5.Conductor 1 is aluminium, copper, aluminium or copper alloy, is made of two-layer at least, the stranded after annealing that presses, and it is about 90% to press rate, and conductor pitch coincidence formula s=knd.Conductor screen 2 and insulation shielding 4 all are to be the mixture of base with ethylene propylene diene rubber (EPDM), and its recipe ingredient is: the stabilizer of 100 parts of polymer, 80～130 parts of high conductive blacks, 30～70 parts of plasticizer, 10 parts lubricant, 2 parts of crosslinking agents and 1 part.Insulation 3 is ethylene-propylene rubber (EPR) mixtures for base.The closely contact mutually of conductor screen 2, insulation 3, insulation shielding 4 can not relatively move in the bending.Conductive jacket 5 is that the ethene-acetate copolymer with acetate content 30～70% is the mixture of base, and recipe ingredient is 100 parts of polymer, 50～60 parts of high conductive blacks, 0～10 part of plasticizer, 2 parts of crosslinking agents, 0.8 part of age resistor.This patent is thought in order to prevent that capacitance current from intersecting contact point from cable and being in not flow through between isopen to cause and burning, vertical conductance of insulation shielding 4 must be than conductive jacket 5 big, the vertical conductance of its insulation shielding is that (be longitudinal resistivity 100～1000 Ω/m), sheath is 0.01～0.05mSm (i.e. 20000～100000 Ω/m) to 1～10mSm.
Summary of the invention
Technical problem to be solved by this invention provides a kind of for generator, motor and the used middle pressure winding cable of transformer.And to possess good flexibility, mechanical strength.
The structure of cable of the present invention such as Fig. 2 are made of conductor 6, conductor screen 7, insulation 8, insulation shielding 9, conductive jacket 10 and conductive coating 11.
Conductor 6 can be the stranded round line (shape of cross section such as Fig. 3) that presses, and also can be special-shaped compact conductor, as: watt shape (shape of cross section such as Fig. 4) and Z-shaped (shape of cross section such as Fig. 5).The stranded number of plies of conductor is at least two-layer.If strandedly press round line, then its conductor material is selected the soft attitude aluminium of high conductivity for use, and conductance is between 61%IACS (International Annealed Copper Standard (International Annealed Copper Standard)) and 63%IACS; If special-shaped conductor compactness forms (i.e. watt shape and Z-shaped or two kinds of combinations, circle line and two kinds of combinations), then conductor material can be aluminium, copper, copper aluminium bimetal composite, aluminium alloy or copper alloy and other can be used as the metal material of conductor, as nickel, silver etc.
Conductor screen 7 and insulation shielding 9 all are to be the mixture of base with ethylene propylene diene rubber (EPDM), and the recipe ingredient of representing with mass parts is: 70～90 parts of EPDM, 10～30 parts of ethylene-vinyl acetate copolymers, 2～10 parts of lubricants, 2～4 parts of crosslinking agents, 50～100 parts of conductive blacks, 1～3 part of age resistor, 10～20 parts of processing oils.Conductor screen 7 can adopt identical recipe ingredient proportioning with insulation shielding 9, also can adopt different proportionings.But their 20 ℃ of specific insulations are between 0.7 Ω m and 1.5 Ω m.
Insulation 8 also is to be the mixture of base with ethylene propylene diene rubber (EPDM), and recipe ingredient is 50～90 parts of EPDM, 10～50 parts of ethylene-vinyl acetate copolymers, 2～10 parts of lubricants, 2～4 parts of crosslinking agents, 50～100 parts of calcinated argils, 1～3 part of age resistor, 10～20 parts of processing oils.The recipe ingredient of insulation 8 is similar to conductor screen 7 and insulation shielding 9, can reduce mutual harmful effect, increases cable life.
Conductor screen 7, insulation 8 and insulation shielding 9 adopt three layers of technology of extruding simultaneously to be coated on the conductor, mutual tight bond, and conductor screen 7 also is critical with conductor 6 and connects airtight the space of touching and fill up conductor 6 surfaces.Extrude simultaneously for three layers and can prevent that impurity from sneaking between each layer, can also increase cohesive force.This just can guarantee that also cable when to stand diameter be 1.5D (D is the outside diameter of cable) crooked, can not ftracture or slippage between conductor 6, conductor screen 7, insulation 8 and the insulation shielding 9.The outer surface of insulation shielding 9 can not have above the projection of 0.25mm or depression, to guarantee all even shielding action of good electric field.
Conductive jacket 10 is to be the mixture of base with neoprene (CR), adds recipe ingredient and be 100 parts of rubber, 5～10 portions of metal oxide activating agents, 1～2 part of promoter, 1～2 part of antiscorching agent, 3～6 parts of amines antioxidantss, 50～100 conductive fillers (as conductive black, graphite etc.).Conductive jacket 10 is extruded and is coated on the insulation shielding 9.Conductive jacket 10 except mechanical protection, have the effects such as anti-amblent air temperature is aging, also have the function of electric field shielding, ground connection passage.Capacitance current will flow to earth terminal by conductive jacket 10 and conductive coating 11, so 20 ℃ of specific insulations of conductive jacket should be less, between 0.1 Ω m and 1 Ω m.
U.S. Pat 4,785,138 think in order to prevent that capacitance current from intersecting contact point from cable and being in not flow through between isopen to cause and burning, what vertical conductance of insulation shielding must be than conductive jacket is big.The vertical conductance of its insulation shielding is that (be longitudinal resistivity 100～1000 Ω/m), sheath is 0.01～0.05mSm (i.e. 20000～100000 Ω/m) to 1～10mSm.And it is considered herein that the capacitance current longitudinal stream crosses the easier incipient scorch that causes of insulation shielding ground connection, better way is to allow the capacitance current radial flow cross grounding sleeve ground connection in conductive jacket and conductive coating and the stator slot.Can form multipoint earthing like this, safer reliable.That is to say that vertical conductance of conductive jacket must be greater than insulation shielding 9.(be that longitudinal resistivity is 2075 Ω/m), conductive jacket is 1.29mSm (i.e. 773 Ω/m) to the vertical conductance 0.48mSm of insulation shielding in the application example.
Than U.S. Pat P4,785,138 also to have increased thickness be the conductive coating 11 of 5～50 μ m in conductive jacket 10 outsides in the present invention.Small-molecule substance in the conductive jacket 10 can slowly precipitate into cable surface in the cable long-time running, increase the contact resistance between cable and grounding sleeve, cause ground connection unreliable, but at the conductive coating 11 of conductive jacket 10 outside close attachment one deck densifications head it off just.Another effect of conductive coating 11 is to reduce cable frictional force in being pressed into stator slot.Conductive coating 11 is fluorocarbon coatings, has good electrical conductivity and lubrification.With conductive jacket 10 good adhesive is arranged behind conductive coating 11 crosslinking curings, and can change along with the telescopic variation of conductive jacket 10, promptly have excellent flexibility, also have conductivity preferably in addition, can not increase the contact resistance between conductive jacket and grounding sleeve.Conductive coating 11 is weather-proof corrosion resistant, can increase cable life.The recipe ingredient of conductive coating 11 is: 100 parts of fluorinated copolymers, 10～30 parts of isocyanide acids curing agent, 60～90 parts of diluents, 10～20 parts of conductive agents.Consider the limit that rubber cable can bear, conductive coating 11 can be at normal temperature to 240 ℃ crosslinking curing.
Description of drawings
Fig. 1 is U.S. Pat P4, the structural representation of 785, the 138 rubber-covered winding cables that relate to.
Fig. 2 is the structural representation of winding cable of the present invention.
Fig. 3 is stranded cross sectional representation of pressing round line for conductor 6.
Fig. 4 is watt shape cross sectional representation of special-shaped compact conductor for conductor 6.
Fig. 5 is Z-shaped cross sectional representation of special-shaped compact conductor for conductor 6.
Embodiment
Embodiment 1: as pressing the long stator winding cable in maglev
Rated voltage-10kV
Conductor adopts 60 soft aluminum conductors to divide 5 layers of stranded pressing, and the direction of lay of adjacent layer is opposite, and pressing coefficient is 91%.And in heating furnace, anneal, conductance is 62%IACS.
Conductor screen is identical with insulation shielding, and recipe ingredient all is 90 parts of EPDM, 10 parts of ethylene-vinyl acetate copolymers, 5 parts of lubricants, 2.5 parts of crosslinking agents, 70 parts of conductive blacks, 1.5 parts of age resistor, 20 parts of processing oils.Its 20 ℃ of specific insulations are 1.0 Ω m, and elongation at break surpasses 400%.
The insulation recipe ingredient is 90 parts of EPDM, 10 parts of ethylene-vinyl acetate copolymers, 5 parts of lubricants, 2.5 parts of crosslinking agents, 60 parts of calcinated argils, 1.5 parts of age resistor, 20 parts of processing oils.Its 20 ℃ of specific insulations are greater than 1.0 * 1013 Ω m, and proof voltage surpasses 30MV/m, satisfies the midium voltage cable requirement fully.Elongation at break surpasses 400% equally.Cable is when bending like this, and the deformation of conductor screen, insulation and insulation shielding can be consistent, and cracking or lamination can not take place.
The conductive jacket recipe ingredient is 100 parts of rubber, 10 portions of metal oxide activating agents, 1.5 parts of promoter, 1 part of antiscorching agent, 4 parts of amines antioxidantss, 60 conductive blacks.Its tensile strength surpasses 300% greater than 15MPa, elongation at break, also has good abrasion resistance simultaneously, can provide the favorable mechanical protection to cable.20 ℃ of specific insulations of conductive jacket only are 0.5 Ω m.So, the vertical conductance of conductive jacket is that 1.29mSm (is longitudinal resistivity 773 Ω/m), and insulation shielding is that (promptly 2075 Ω/m), capacitance current just can pass through the grounding sleeve of conductive jacket radial flow in stator slot to 0.48mSm, plays the effect of multiple spot effective grounding.
The conductive coating recipe ingredient is: 100 parts of PVFs and alkyl vinyl ether co-polymer (FEVE), 19 parts of isocyanide acids curing agent, 20 parts of ammoniacum class diluents, 50 parts of benzene class diluents, 15 parts of conductive agents.Conductive coating is behind 180 ℃ of crosslinking curing 6min, and on conductive jacket, any bending of cable can not cause the conductive coating cracking yet or come off with regard to tight adhesion.The bloom phenomenon does not appear in cable in actual use yet.After increasing this conductive coating, the coefficient of sliding friction of cable is reduced to 10% before the applying coating.
Cable 24kV partial discharge of the present invention only is 2.5pC (national standard requires to be no more than 20pC), positive and negative 3 crooked back partial discharges through bending diameter 6D (D is the outside diameter of cable) also have only 2.7pC, and the partial discharge when bending diameter is reached for 1.5D under the limiting case is 3.5pC.This is because the elongation at break of conductor screen, insulation and insulation shielding is close, and cable is when bending, and cracking or layering do not take place their deformation unanimity.Even subzero 25 ℃ down be the bending of 1.5D through positive and negative 3 bending diameters after, the layering of also can not ftractureing of the interface of the conductor screen of cable of the present invention, insulation and insulation shielding.
Be heated to (95～100) ℃ through galvanization in the cable conductor of above-mentioned bending, keep 2h at least, natural cooling 3h at least in air then, through such 20 circulations, after the test of 160h, partial discharge is still lower, is 11pC altogether.This is similar just because of recipe ingredient and the conductor screen and the insulation shielding of insulation, reduces mutual harmful effect, has increased the reason of cable life.Cable of the present invention is through after the above-mentioned test, and is just breakdown behind 40min under the voltage of 90kV, and long reliability height of its life-span also is described.
Cable performance of the present invention satisfies the specification requirement of related request the IEC 60502-2 " rated voltage 1kV (Um=1.2kV) to extruding insulation power cable and the annex part 2 thereof of 30kV (Um=36kV): the cable of specified cable from 1kV (Um=1.2kV) to 30kV (Um=36kV) " and linear motor long stator winding cable fully.
Embodiment 2: as the winding cable of transformer
Rated voltage-10kV
Conductor divide 5 layers stranded, the inside is two-layer to be copper round wire, 3 layers of aluminum conductor cross section, outside are Z-shaped, the direction of lay of adjacent layer is opposite, and anneals in heating furnace.
Conductor screen is identical with insulation shielding, and recipe ingredient all is 70 parts of EPDM, 30 parts of ethylene-vinyl acetate copolymers, 10 parts of lubricants, 3 parts of crosslinking agents, 90 parts of conductive blacks, 2 parts of age resistor, 15 parts of processing oils.
The insulation recipe ingredient is 70 parts of EPDM, 30 parts of ethylene-vinyl acetate copolymers, 10 parts of lubricants, 3 parts of crosslinking agents, 80 parts of calcinated argils, 2 parts of age resistor, 15 parts of processing oils.
The conductive jacket recipe ingredient is 100 parts of rubber, 10 portions of metal oxide activating agents, 1 part of promoter, 2 parts of antiscorching agent, 6 parts of amines antioxidantss, 90 conductive blacks.
The conductive coating recipe ingredient is: 100 parts of fluorinated copolymers, 25 parts of isocyanide acids curing agent, 30 parts of ammoniacum class diluents, 60 parts of benzene class diluents, 20 parts of conductive agents.
Embodiment 3: as the cable of generator windings
Rated voltage-35kV
Conductor adopt the soft copper lead divide 4 layers stranded, 2 layers of aluminum conductor cross section, outside are a watt shape, the direction of lay of adjacent layer is opposite, and anneals in heating furnace.
Conductor screen is identical with insulation shielding, and recipe ingredient all is 80 parts of EPDM, 20 parts of ethylene-vinyl acetate copolymers, 3 parts of lubricants, 4 parts of crosslinking agents, 60 parts of conductive blacks, 3 parts of age resistor, 10 parts of processing oils.
The insulation recipe ingredient is 80 parts of EPDM, 20 parts of ethylene-vinyl acetate copolymers, 3 parts of lubricants, 4 parts of crosslinking agents, 70 parts of calcinated argils, 3 parts of age resistor, 10 parts of processing oils.
The conductive jacket recipe ingredient is 100 parts of rubber, 7 portions of metal oxide activating agents, 2 parts of promoter, 1 part of antiscorching agent, 3 parts of amines antioxidantss, 75 conductive blacks.
The conductive coating recipe ingredient is: 100 parts of fluorinated copolymers, 15 parts of isocyanide acids curing agent, 15 parts of ammoniacum class diluents, 40 parts of benzene class diluents, 10 parts of conductive agents.

Claims (5)

1. press winding cable in one kind, it is characterized in that: by conductor (6), conductor screen (7), insulation (8), insulation shielding (9), conductive jacket (10) and conductive coating (11) formation;
Vertical conductance of described conductive jacket (10) is greater than vertical conductance of insulation shielding (9);
Described conductor screen (7) and insulation shielding (9), between 0.7 Ω m and 1.5 Ω m, the recipe ingredient of representing with mass parts is at 20 ℃ of specific insulations: 70～90 parts of ethylene propylene diene rubbers, 10～30 parts of ethylene-vinyl acetate copolymers, 2～10 parts of lubricants, 2～4 parts of crosslinking agents, 50～100 parts of conductive blacks, 1～3 part of age resistor, 10～20 parts of processing oils;
The recipe ingredient that described insulation (8) is represented with mass parts is: 50～90 parts of ethylene propylene diene rubbers, 10～50 parts of ethylene-vinyl acetate copolymers, 2～10 parts of lubricants, 2～4 parts of crosslinking agents, 50～100 parts of calcinated argils, 1～3 part of age resistor, 10～20 parts of processing oils;
Between 0.1 Ω m and 1 Ω m, the recipe ingredient of representing with mass parts is described conductive jacket (10) at 20 ℃ of specific insulations: 100 parts of rubber, 5～10 portions of metal oxide activating agents, 1～2 part of promoter, 1～2 part of antiscorching agent, 3～6 parts of amines antioxidantss, 50～100 conductive fillers.
2. press winding cable in according to claim 1, it is characterized in that, described conductor (6) shape of cross section is the stranded round line that presses, the stranded number of plies of conductor is at least two-layer, selecting conductor material for use is soft attitude aluminium, its conductance is according to International Annealed Copper Standard, between 61%IACS and 63%IACS.
3. press winding cable in according to claim 1, it is characterized in that, described conductor (6) shape of cross section is a watt shape or Z-shaped, and the stranded number of plies of conductor is at least two-layer, and conductor material is aluminium, copper, copper aluminium bimetal composite, aluminium alloy, copper alloy, nickel or silver.
4. press winding cable in according to claim 1, it is characterized in that, described conductor screen (7), insulation (8) and insulation shielding (9) adopt three layers of technology of extruding simultaneously to be coated on the conductor, mutual tight bond, conductor screen (7) also closely contacts and fills up the space on conductor (6) surface with conductor (6).
5. press winding cable in according to claim 1, it is characterized in that the recipe ingredient that described conductive coating (11) is represented with mass parts is: 100 parts of fluorinated copolymers, 10～30 parts of isocyanide acids curing agent, 60～90 parts of diluents, 10～20 parts of conductive agents.
CNB2005100236000A 2005-01-26 2005-01-26 Medium voltage winding cable for electric generator, motor and transformer Active CN100365738C (en)

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CNB2005100236000A CN100365738C (en) 2005-01-26 2005-01-26 Medium voltage winding cable for electric generator, motor and transformer

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Application Number Priority Date Filing Date Title
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CN100365738C true CN100365738C (en) 2008-01-30

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4785138A (en) * 1985-12-06 1988-11-15 Kabel Electro Gesellschaft mit beschrankter Haftung Electric cable for use as phase winding for linear motors
CN1049369A (en) * 1990-06-30 1991-02-20 无锡县塑料制品厂 Self-adhesive electric stress control tape
CN1300085A (en) * 2001-01-09 2001-06-20 郑州电缆(集团)股份有限公司 Crosslinked polyethylene insulated power cable
CN1431535A (en) * 2003-01-15 2003-07-23 上海电缆研究所 Track resistant jacket material of full medium and self bearing type aerial fiber cable
CN1431665A (en) * 2003-01-29 2003-07-23 国家磁浮交通工程技术研究中心 Soft cable of high-voltage winding utilized in generators and transformers

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4785138A (en) * 1985-12-06 1988-11-15 Kabel Electro Gesellschaft mit beschrankter Haftung Electric cable for use as phase winding for linear motors
CN1049369A (en) * 1990-06-30 1991-02-20 无锡县塑料制品厂 Self-adhesive electric stress control tape
CN1300085A (en) * 2001-01-09 2001-06-20 郑州电缆(集团)股份有限公司 Crosslinked polyethylene insulated power cable
CN1431535A (en) * 2003-01-15 2003-07-23 上海电缆研究所 Track resistant jacket material of full medium and self bearing type aerial fiber cable
CN1431665A (en) * 2003-01-29 2003-07-23 国家磁浮交通工程技术研究中心 Soft cable of high-voltage winding utilized in generators and transformers

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