CN103871615A - High-elasticity anti-twist wind energy cable with nominal voltage of six to thirty-five kilowatts and manufacturing method - Google Patents
High-elasticity anti-twist wind energy cable with nominal voltage of six to thirty-five kilowatts and manufacturing method Download PDFInfo
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- CN103871615A CN103871615A CN201410134564.4A CN201410134564A CN103871615A CN 103871615 A CN103871615 A CN 103871615A CN 201410134564 A CN201410134564 A CN 201410134564A CN 103871615 A CN103871615 A CN 103871615A
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Abstract
The invention discloses a high-elasticity anti-twist wind energy cable with the nominal voltage of six to thirty-five kilowatts. Three power insulated wire cores and three grounding insulation wire cores form a cable core in a twisted mode, the outer side of the cable core is sequentially provided with a two-layer alkali-free glass fiber band in an overlapped wrapping mode and a thermoplastic elastic outer jacket in an extruded wrapping mode, the outermost layer of the cable is a stainless steel wire, polyamide or polyester synthetic fiber yarn woven layer; each power insulated wire core forms a conductor by twisting tin-plated non-oxygen copper wires and stainless steel wires, each conductor is wrapped with a single-layer semi-conductive cotton tape wrapping layer in an overlapped wrapping mode, and a conduct shielding layer, an ethylene-propylene-diene monomer insulated layer and an insulated shielding layer form one power insulated wire core in an extruded wrapping mode; a semi-conductive rubber shielding layer is arranged on the outer side of each grounding insulation wire core conductor in an extruded wrapping mode. The high-elasticity anti-twist wind energy cable has the advantages of being high in extension strength, high in flexibility and abrasion resistance, resistant to oil, aging and outer environment weather and the like, and is suitable for connection portions of a turbine and a tower in a high-power wind power generation device and similar occasions.
Description
Technical field:
The present invention relates to a kind of rated voltage 6～35kV high resiliency warp resistance wind energy cable and manufacture method.
Background technology:
Wind energy, as a kind of clean regenerative resource, is more and more subject to the attention of countries in the world.Its reserves are huge, and Global Wind-energy total resources is about 2.74 × 10
9mW, wherein available wind energy is 2 × 10
7mW.Wind Energy In China reserves are very large, it is wide to distribute, and only the wind energy content of land is just had an appointment 2.53 hundred million kilowatts, and exploitation have a high potential.
In recent years, affected by international macroeconomic situation, Chinese Economy Development speed eases up.For pulling effectively domestic demand, keep economic society to develop smoothly and faster, government has strengthened the investment in fixed assets dynamics to traffic, energy field, supports and encourages Renewable Energy Development.As the new forms of energy of energy-conserving and environment-protective, Wind Power Generation Industry wins historic opportunity to develop, in the adverse environment of wreaking havoc in financial crisis, raises up against the market, and growth momentum is swift and violent, and by the end of the beginning of this year, the whole nation existing 25 provinces, municipality directly under the Central Government, autonomous regions have wind-powered electricity generation installation.
The development prospect of the generation of electricity by new energy industries such as China Wind Power is very wide, and the future a very long time all will keep high speed development, and profitability is also by the ripe lifting steadily gradually along with technology simultaneously.Along with the production domesticization of Wind Power In China installation and the scale of generating, wind power cost is expected to fall again.Therefore wind-powered electricity generation starts to become more and more investors' the ground by gold.Construction of Wind Power, generate electricity by way of merging two or more grid systems, the field such as wind power equipment manufacture becomes the bright spot of investment, market prospects are good.
But the development of wind energy cable but seriously lags behind, reason is that wind energy cable requirement has warp resistance, high-low temperature resistant, has the technical indicators such as high resiliency, and domestic a lot of cable producer does not have these type of technical conditions.
Summary of the invention:
For overcoming the defect of prior art, the object of the present invention is to provide a kind of rated voltage 6～35kV high resiliency warp resistance wind energy cable and manufacture method, cable has the characteristics such as high-tensile, high-flexibility, high abrasion, oil resistant, ageing-resistant, the weather of resistance to external environment, also there is high bending coilings, resistance to torsion simultaneously, resist pull, the function of many excellences such as environmental protection, be applicable to turbine and tower cylinder junction or its similar applications in high power wind-mill generating equipment.
Technical solution problem of the present invention adopts following technical scheme:
Rated voltage 6～35kV high resiliency warp resistance wind energy cable, by three power insulated wire cores with three ground insulation cores are stranded forms cable core, overlapping be successively surrounded with double-deck alkali-free glass fiber band outward at described cable core, be extruded with thermoplastic elastomer (TPE) oversheath, the outermost layer of cable is stainless steel wire, polyamide or polyesters synthetic fiber yarn braid;
Each described power insulated wire cores forms conductor by zinc-plated copper free wire, stainless steel wire are stranded, the outer overlapping individual layer semiconductive cotton tape lapping layer that is surrounded with of conductor, described lapping layer outer three-layer co-extruded have conductor shield, ethylene propylene diene rubber insulating barrier and insulation screen formation power insulated wire cores;
Each described ground insulation core forms conductor by zinc-plated copper free wire, stainless steel wire are stranded, and described conductor is extruded with semi-conductive rubber screen outward.
The preparation method of wind energy cable of the present invention, it comprises the following steps:
Steps A, conductor are made; According to the single line radical of composition cable different cross section, when bundle strand conductor, in tinned copper wire, evenly add stainless steel wire to strengthen, tinned copper wire and stainless steel wire answer diameter close, diameter allowable tolerance is ± 0.2mm, tinned copper wire is 8:1 with stainless steel wire radical ratio, and in the middle of tin plated wire and stainless steel wire, has not all allowed joint; The outer overlapping wrapped individual layer semiconductive cotton tape of conductor, the rate of putting up is not less than 15%;
The maximum gauge of conductor single line should meet the regulation of the 5th kind of zinc-plated soft copper conductor in GB/T3956-2008; In conductor, strand strand twist to identical when with multiple strand, and skin twists to being left-hand; Its stranded lay ratio should be not more than the regulation of following table:
Step B, power insulated wire cores are made; The three-layer co-extruded technique of the outer employing of described conductor, i.e. conductor shield+ethylene propylene diene rubber insulating barrier+insulation screen, three layers of extrusion molding; Conductor shield extruded material is nonmetal semiconductive material, and its minimal thickness is 0.6mm; Insulation shielding layer material is nonmetal semiconductive material, and its minimal thickness is 0.8mm; Rated voltage 8.7/15kV and following cable insulation material are that 10kV EPT rubber Insulation Material, the above cable insulation material of rated voltage 8.7/15kV are 35kV EPT rubber Insulation Material, the thinnest point of insulating barrier is not less than the 90%-0.1mm of nominal value, and average thickness is not less than nominal value, its nominal thickness should meet the regulation of following table:
Insulated wire cores extrusion die adopts squash type, and when mould apolegamy, core rod and die sleeve internal diameter are carried out by following provisions respectively:
Core rod internal diameter: D
core=D
0+ 2 ε
Middle mould internal diameter: D
in=D
0+ 2 δ
in* 1.05
Die sleeve internal diameter: D
outward=D
0+ 2(δ
in+ 1.1* insulation thickness+δ
outward)
Wherein: D
0for extruding front core external diameter, ε was line surplus, δ
infor interior screen thickness, δ
outwardfor outer screen thickness; Cross selecting of line surplus ε, meet the regulation of following table:
While extruding, the interior steam pressure of curing tube, sulfuration linear speed and temperature control parameter are as following table; Speed of production allows suitably to adjust and be as the criterion with actual cure efficiency the best;
Step C, ground insulation core are made; Outside conductor, adopt and extrude semi-conductive rubber screen, ground insulation core thickness is to guarantee that its external diameter is not less than 75% of power insulated wire cores external diameter and is as the criterion, and extrusion die adopts squash type, and when mould apolegamy, core rod and die sleeve internal diameter are carried out by following provisions respectively:
Core rod internal diameter: D
core=D
0+ ε
Wherein: D
0for extruding front core external diameter, ε was line surplus;
Cross selecting of line surplus ε, meet the regulation of following table:
Die sleeve internal diameter: D
cover=D
0+ 2 δ-(0.1～0.4) mm;
Wherein: D
0for extruding front core external diameter, δ is semi-conductive rubber shielding thickness;
While extruding, the interior steam pressure of curing tube, sulfuration linear speed and temperature control parameter are as following table; Speed of production allows suitably to adjust and be as the criterion with actual cure efficiency the best;
Step D, three described power insulated wire cores and three described ground insulation cores carry out dextrad stranding, when stranding, the control of each core tension force is even, insulated wire cores is according to ground connection core alternative arrangement of a power core, stranding lay ratio is controlled between 12～14, cable core gap adopts the rope made of hemp to fill rounding, doubling mould is chosen according to laying up diameter, crossing line surplus is controlled between 0.5～1.0mm, the outer overlapping wrapped double-deck alkali-free glass fiber band of cable core, the overlapping wrapped rate of putting up, between 25%～30%, adopts left-hand wrapped when wrapped;
Step e, extrude thermoplastic elastomer (TPE) oversheath at the outer plsitive mold that adopts of alkali-free glass fiber band described in step D, protective cover material is dried before extruding, baking temperature is controlled between 100～115 ℃, and the time is 1.0～2.5 hours, and sheathing temperature meets the regulation of following table:
| Plastic extruding machine region | Temperature/℃ |
| Charging | 95～105 |
| Bringing-up section 1 | 120～130 |
| Bringing-up section 2 | 135～145 |
| Bringing-up section 3 | 155～165 |
| Machine neck | 160～170 |
| Head | 165～175 |
| Die sleeve | 160～170 |
Sheath nominal thickness calculates according to the computational methods of GB/T12706.1-2008 national standard, and the thinnest point is not less than the 85%-0.1mm of nominal value, and average thickness is not less than nominal value;
Step F, outside sheath braided metal fiber composite armour, braid is made up of stainless steel wire and polyamide or polyesters synthetic fiber yarn, both number of spindles is identical, opposite direction; Braid does not allow entirety to continue, and the end of a thread exposing should be had one's hair trimmed, and allows to change a metal wire bar in every 1m length;
According to IEC60092-376:2003 international standard, select per share radical and filament diameter to require to carry out doubling, doubling even tension, stainless steel wire joint adopts cold welding machine welding, pad should be smooth, rounding, without obviously protruding, fiber doubling width should be identical with wire doubling width, after doubling completes, bobbin is arranged on braiding machine, more gear changing, pitch and the tension force of adjusting braiding machine weave, when braiding line diameter is below 0.2mm time, braiding machine starting up speed is controlled at 60%～70% of maximum operating speed, when braiding line diameter is 0.2mm and when above, braiding machine starting up speed is controlled at 50%～60% of maximum operating speed,
Braiding lay ratio is that pitch length/braid average diameter is controlled between 2～4.5, and count is not less than 90%;
The computing formula of count is:
M=2F -F2 (1)
F=and'/[π(D+2d')cosα] (2)
tg α=[π(d"+2d')]/H (3)
Kr={1+[π(d"+2d)/H]2}-1/2 (4)
In formula: M is that count is total coverage coefficient, F is that one side covers braiding coefficient, and tg α is braiding angle tangent, and Kr is braiding coefficient, H is lay of braiding, and d' is the rear line diameter of braiding, and a is braiding half number of spindle unit, n is braiding doubling radical, and α is braiding angle, d " weaves front line diameter.
Compared with the prior art, beneficial effect of the present invention is embodied in:
1, conductor of the present invention is according to the single line radical of composition cable different cross section, when bundle strand conductor, in tinned copper wire, evenly add stainless steel wire to strengthen, tin plated wire and stainless steel wire are answered diameter close (diameter allowable tolerance is ± 0.2mm), its radical ratio is about 8:1, and in the middle of tin plated wire and stainless steel wire, all do not allow joint, greatly improved the tensile strength of cable, guaranteed that cable keeps excellent electric property in running simultaneously, and flexible coiling, pull long service life.
2, cable of the present invention adopts 3+3 symmetrical structure, adopts 3 ground cores to extrude semi-conductive rubber outward, replaces the metal screen layer outside 3 traditional power insulated wire cores; When stranding, adopt 3 power insulated wire cores and 3 ground insulation core alternative arrangements, ground insulation core is closely connected with the insulation screen of power insulated wire cores, reach the effect that replaces cable metal screen, guarantee that cable has excellent electric property, mechanical performance and softness.
3, ground insulation external diameter of the present invention is not less than 75% of power insulated wire cores external diameter, and the external diameter of power core and ground connection core differs by fixed proportion, has both guaranteed the shielding properties of cable, is conducive to again improve the warp resistance performance of cable.
4, in the present invention, extrude anti-modification TPE elastomer, original TPE material is improved, not only there is excellent elasticity, toughness, intensity, have advantages of that many other materials such as good resistance to environment is corrosion-resistant are incomparable simultaneously.The employing of this new material has guaranteed that cable has the characteristics such as high-tensile, high-flexibility, high coiling, high abrasion, oil resistant, ageing-resistant, the weather of resistance to external environment, environmental protection, meets the instructions for use of the bent flexible cable of wind-power torsion-resistant completely.
5, the present invention adopts braiding stainless steel wire and polyamide or polyesters synthetic fiber yarn as outer jacket, has greatly improved bending property and the tensile strength of cable, has effectively protected the damage of sheath simultaneously, improves the useful life of cable.
Accompanying drawing explanation:
Fig. 1 is the structural representation of cable of the present invention.
Number in the figure: 1 zinc-plated copper free wire, 2 stainless steel wires, 3 lapping layers, 4 conductor shields, 5 ethylene propylene diene rubber insulating barriers, 6 insulation screens, 7 semi-conductive rubber screens, 8 alkali-free glass fiber bands, 9 oversheaths, 10 braids.
Below pass through embodiment, and the invention will be further described by reference to the accompanying drawings.
Embodiment:
Embodiment: rated voltage 6～35kV high resiliency warp resistance wind energy cable of the present invention, by three power insulated wire cores with three ground insulation cores are stranded forms cable core, overlapping be successively surrounded with double-deck alkali-free glass fiber band 8 outward at cable core, be extruded with thermoplastic elastomer (TPE) oversheath 9, the outermost layer of cable is stainless steel wire, polyamide or polyesters synthetic fiber yarn braid 10;
Each power insulated wire cores forms conductor by zinc-plated copper free wire 1, stainless steel wire 2 are stranded, the outer overlapping individual layer semiconductive cotton tape lapping layer 3 that is surrounded with of conductor, described lapping layer 3 is outer three-layer co-extrudedly has conductor shield 4, ethylene propylene diene rubber insulating barrier 5 and insulation screen 6 to form power insulated wire cores;
Each ground insulation core forms conductor by zinc-plated copper free wire, stainless steel wire are stranded, and described conductor is extruded with semi-conductive rubber screen 7 outward.
The preparation method of wind energy cable of the present invention, it comprises the following steps:
Steps A, conductor are made; According to the single line radical of composition cable different cross section, when bundle strand conductor, in tinned copper wire, evenly add stainless steel wire to strengthen, tinned copper wire and stainless steel wire answer diameter close, diameter allowable tolerance is ± 0.2mm, tinned copper wire is 8:1 with stainless steel wire radical ratio, and in the middle of tin plated wire and stainless steel wire, has not all allowed joint; The outer overlapping wrapped individual layer semiconductive cotton tape of conductor, the rate of putting up is not less than 15%;
The maximum gauge of conductor single line should meet the regulation of the 5th kind of zinc-plated soft copper conductor in GB/T3956-2008; In conductor, strand strand twist to identical when with multiple strand, and skin twists to being left-hand; Its stranded lay ratio should be not more than the regulation of following table:
Step B, power insulated wire cores are made; The three-layer co-extruded technique of the outer employing of described conductor, i.e. conductor shield+ethylene propylene diene rubber insulating barrier+insulation screen, three layers of extrusion molding; Conductor shield extruded material is nonmetal semiconductive material, and its minimal thickness is 0.6mm; Insulation shielding layer material is nonmetal semiconductive material, and its minimal thickness is 0.8mm; Rated voltage 8.7/15kV and following cable insulation material are that 10kV EPT rubber Insulation Material, the above cable insulation material of rated voltage 8.7/15kV are 35kV EPT rubber Insulation Material, the thinnest point of insulating barrier is not less than the 90%-0.1mm of nominal value, and average thickness is not less than nominal value, its nominal thickness should meet the regulation of following table:
Insulated wire cores extrusion die adopts squash type, and when mould apolegamy, core rod and die sleeve internal diameter are carried out by following provisions respectively:
Core rod internal diameter: D
core=D
0+ 2 ε
Middle mould internal diameter: D
in=D
0+ 2 δ
in* 1.05
Die sleeve internal diameter: D
outward=D
0+ 2(δ
in+ 1.1* insulation thickness+δ
outward)
Wherein: D
0for extruding front core external diameter, ε was line surplus, δ
infor interior screen thickness, δ
outwardfor outer screen thickness;
Cross selecting of line surplus ε, meet the regulation of following table:
While extruding, the interior steam pressure of curing tube, sulfuration linear speed and temperature control parameter are as following table; Speed of production allows suitably to adjust and be as the criterion with actual cure efficiency the best;
Step C, ground insulation core are made; Outside conductor, adopt and extrude semi-conductive rubber screen, ground insulation core thickness is to guarantee that its external diameter is not less than 75% of power insulated wire cores external diameter and is as the criterion, and extrusion die adopts squash type, and when mould apolegamy, core rod and die sleeve internal diameter are carried out by following provisions respectively:
Core rod internal diameter: D
core=D
0+ ε
Wherein: D
0for extruding front core external diameter, ε was line surplus;
Cross selecting of line surplus ε, meet the regulation of following table:
Die sleeve internal diameter: D
cover=D
0+ 2 δ-(0.1～0.4) mm;
Wherein: D
0for extruding front core external diameter, δ is semi-conductive rubber shielding thickness;
While extruding, the interior steam pressure of curing tube, sulfuration linear speed and temperature control parameter are as following table; Speed of production allows suitably to adjust and be as the criterion with actual cure efficiency the best;
Step D, three described power insulated wire cores and three described ground insulation cores carry out dextrad stranding, when stranding, the control of each core tension force is even, insulated wire cores is according to ground connection core alternative arrangement of a power core, stranding lay ratio is controlled between 12～14, cable core gap adopts the rope made of hemp to fill rounding, doubling mould is chosen according to laying up diameter, crossing line surplus is controlled between 0.5～1.0mm, the outer overlapping wrapped double-deck alkali-free glass fiber band of cable core, the overlapping wrapped rate of putting up, between 25%～30%, adopts left-hand wrapped when wrapped;
Step e, extrude thermoplastic elastomer (TPE) oversheath at the outer plsitive mold that adopts of alkali-free glass fiber band described in step D, protective cover material is dried before extruding, baking temperature is controlled between 100～115 ℃, and the time is 1.0～2.5 hours, and sheathing temperature meets the regulation of following table:
| Plastic extruding machine region | Temperature/℃ |
| Charging | 95～105 |
| Bringing-up section 1 | 120～130 |
| Bringing-up section 2 | 135～145 |
| Bringing-up section 3 | 155～165 |
| Machine neck | 160～170 |
| Head | 165～175 |
| Die sleeve | 160～170 |
Sheath nominal thickness calculates according to the computational methods of GB/T12706.1-2008 national standard, and the thinnest point is not less than the 85%-0.1mm of nominal value, and average thickness is not less than nominal value;
Step F, outside sheath braided metal fiber composite armour, braid is made up of stainless steel wire and polyamide or polyesters synthetic fiber yarn, both number of spindles is identical, opposite direction; Braid does not allow entirety to continue, and the end of a thread exposing should be had one's hair trimmed, and allows to change a metal wire bar in every 1m length;
According to IEC60092-376:2003 international standard, select per share radical and filament diameter to require to carry out doubling, doubling even tension, stainless steel wire joint adopts cold welding machine welding, pad should be smooth, rounding, without obviously protruding, fiber doubling width should be identical with wire doubling width, after doubling completes, bobbin is arranged on braiding machine, more gear changing, pitch and the tension force of adjusting braiding machine weave, when braiding line diameter is below 0.2mm time, braiding machine starting up speed is controlled at 60%～70% of maximum operating speed, when braiding line diameter is 0.2mm and when above, braiding machine starting up speed is controlled at 50%～60% of maximum operating speed,
Braiding lay ratio is that pitch length/braid average diameter is controlled between 2～4.5, and count is not less than 90%;
The computing formula of count is:
M=2F -F2 (1)
F=and'/[π(D+2d')cosα] (2)
tg α=[π(d"+2d')]/H (3)
Kr={1+[π(d"+2d)/H]2}-1/2 (4)
In formula: M is that count is total coverage coefficient, F is that one side covers braiding coefficient, and tg α is braiding angle tangent, and Kr is braiding coefficient, H is lay of braiding, and d' is the rear line diameter of braiding, and a is braiding half number of spindle unit, n is braiding doubling radical, and α is braiding angle, d " weaves front line diameter.
In cable making method implementation process of the present invention, should note following some:
1,, according to the single line radical of composition cable different cross section, when bundle strand conductor, in tinned copper wire, evenly add stainless steel wire to strengthen, and can not have joint in the middle of guaranteeing, to guarantee tensile property and bending, the softness of cable.
2, when power insulated wire cores extrudes, insulating material must guarantee to clean, and adopts squash type to produce, and controls sulfuration steam pressure, curingprocess rate well, and adjust mould in production process, forbids occurring the bad phenomenon such as eccentric, sulfuration inequality, broken hole.
3, when ground insulation core extrudes, insulating material is necessary for semi-conductive rubber material, and adopt squash type to produce, in production process, control sulfuration steam pressure, curingprocess rate well, and adjust mould, forbid occurring the bad phenomenon such as bias, sulfuration inequality, broken hole, and notice that control ground insulation external diameter is not less than 75% of power insulated wire cores external diameter.
4, stranding adopts the symmetrical stranding of 3+3, insulated wire cores is according to 1 ground connection core alternative arrangement of 1 power core, the control of core tension force is even, stranding lay ratio is controlled between 12～14, avoids the frequent movement of cable core in bending moving process and causes the phenomenon such as extruding, stretching of core and destroyed the insulation property of core; Cable core is answered overlapping wrapped suitable band outward, does not allow to occur bottom pour ladle, wrapped loose phenomenon.
5, oversheath is extruded modification TPE elastic body jacket, should note the product quality of protective cover material, the phenomenon such as forbid occurring getting damp, and before extruding, carry out certain drying and processing, extrusion temperature will control to suitable scope, to guarantee good plasticizing and perfect technical matters.
6, braiding stainless steel wire and polyamide or polyesters synthetic fiber yarn composite armor are as the external protection of cable; must guarantee being convinced of its outward appearance, without burr, without phenomenons such as leaks; while requiring braiding; it is consistent that braided wires tension force is wanted; pitch will be controlled well; joint should be processed smooth, forbids braid to occur the bad phenomenon such as burr, eye, to guarantee electric conductivity and the electric property of cable.
Claims (2)
1. rated voltage 6～35kV high resiliency warp resistance wind energy cable, it is characterized in that, by three power insulated wire cores with three ground insulation cores are stranded forms cable core, overlapping be successively surrounded with double-deck alkali-free glass fiber band (8) outward at described cable core, be extruded with thermoplastic elastomer (TPE) oversheath (9), the outermost layer of cable is stainless steel wire, polyamide or polyesters synthetic fiber yarn braid (10);
Each described power insulated wire cores is by zinc-plated copper free wire (1), the stranded formation conductor of stainless steel wire (2), the outer overlapping individual layer semiconductive cotton tape lapping layer (3) that is surrounded with of conductor, described lapping layer (3) outer three-layer co-extruded have conductor shield (4), ethylene propylene diene rubber insulating barrier (5) and insulation screen (6) formation power insulated wire cores;
Each described ground insulation core is by zinc-plated copper free wire (1), the stranded formation conductor of stainless steel wire (2), and described conductor is extruded with semi-conductive rubber screen (7) outward.
2. a preparation method for wind energy cable claimed in claim 1, is characterized in that comprising the following steps:
Steps A, conductor are made; According to the single line radical of composition cable different cross section, when bundle strand conductor, in tinned copper wire, evenly add stainless steel wire to strengthen, tinned copper wire and stainless steel wire answer diameter close, diameter allowable tolerance is ± 0.2mm, tinned copper wire is 8:1 with stainless steel wire radical ratio, and in the middle of tin plated wire and stainless steel wire, has not all allowed joint; The outer overlapping wrapped individual layer semiconductive cotton tape of conductor, the rate of putting up is not less than 15%;
The maximum gauge of conductor single line should meet the regulation of the 5th kind of zinc-plated soft copper conductor in GB/T3956-2008; In conductor, strand strand twist to identical when with multiple strand, and skin twists to being left-hand; Its stranded lay ratio should be not more than the regulation of following table:
Step B, power insulated wire cores are made; The three-layer co-extruded technique of the outer employing of described conductor, i.e. conductor shield+ethylene propylene diene rubber insulating barrier+insulation screen, three layers of extrusion molding; Conductor shield extruded material is nonmetal semiconductive material, and its minimal thickness is 0.6mm; Insulation shielding layer material is nonmetal semiconductive material, and its minimal thickness is 0.8mm; Rated voltage 8.7/15kV and following cable insulation material are that 10kV EPT rubber Insulation Material, the above cable insulation material of rated voltage 8.7/15kV are 35kV EPT rubber Insulation Material, the thinnest point of insulating barrier is not less than the 90%-0.1mm of nominal value, and average thickness is not less than nominal value, its nominal thickness should meet the regulation of following table:
Insulated wire cores extrusion die adopts squash type, and when mould apolegamy, core rod and die sleeve internal diameter are carried out by following provisions respectively:
Core rod internal diameter: D
core=D
0+ 2 ε
Middle mould internal diameter: D
in=D
0+ 2 δ
in* 1.05
Die sleeve internal diameter: D
outward=D
0+ 2(δ
in+ 1.1* insulation thickness+δ
outward)
Wherein: D
0for extruding front core external diameter, ε was line surplus, δ
infor interior screen thickness, δ
outwardfor outer screen thickness;
Cross selecting of line surplus ε, meet the regulation of following table:
While extruding, the interior steam pressure of curing tube, sulfuration linear speed and temperature control parameter are as following table;
Step C, ground insulation core are made; Outside conductor, adopt and extrude semi-conductive rubber screen, ground insulation core thickness is to guarantee that its external diameter is not less than 75% of power insulated wire cores external diameter and is as the criterion, and extrusion die adopts squash type, and when mould apolegamy, core rod and die sleeve internal diameter are carried out by following provisions respectively:
Core rod internal diameter: D
core=D
0+ ε
Wherein: D
0for extruding front core external diameter, ε was line surplus;
Cross selecting of line surplus ε, meet the regulation of following table:
Die sleeve internal diameter: D
cover=D
0+ 2 δ-(0.1～0.4) mm;
Wherein: D
0for extruding front core external diameter, δ is semi-conductive rubber shielding thickness;
While extruding, the interior steam pressure of curing tube, sulfuration linear speed and temperature control parameter are as following table;
Step D, three described power insulated wire cores and three described ground insulation cores carry out dextrad stranding, when stranding, the control of each core tension force is even, insulated wire cores is according to ground connection core alternative arrangement of a power core, stranding lay ratio is controlled between 12～14, cable core gap adopts the rope made of hemp to fill rounding, doubling mould is chosen according to laying up diameter, crossing line surplus is controlled between 0.5～1.0mm, the outer overlapping wrapped double-deck alkali-free glass fiber band of cable core, the overlapping wrapped rate of putting up, between 25%～30%, adopts left-hand wrapped when wrapped;
Step e, extrude thermoplastic elastomer (TPE) oversheath at the outer plsitive mold that adopts of alkali-free glass fiber band described in step D, protective cover material is dried before extruding, baking temperature is controlled between 100～115 ℃, and the time is 1.0～2.5 hours, and sheathing temperature meets the regulation of following table:
Sheath nominal thickness calculates according to the computational methods of GB/T12706.1-2008 national standard, and the thinnest point is not less than the 85%-0.1mm of nominal value, and average thickness is not less than nominal value;
Step F, outside sheath braided metal fiber composite armour, braid is made up of stainless steel wire and polyamide or polyesters synthetic fiber yarn, both number of spindles is identical, opposite direction; Braid does not allow entirety to continue, and the end of a thread exposing should be had one's hair trimmed, and allows to change a metal wire bar in every 1m length;
According to IEC60092-376:2003 international standard, select per share radical and filament diameter to require to carry out doubling, doubling even tension, stainless steel wire joint adopts cold welding machine welding, pad should be smooth, rounding, without obviously protruding, fiber doubling width should be identical with wire doubling width, after doubling completes, bobbin is arranged on braiding machine, more gear changing, pitch and the tension force of adjusting braiding machine weave, when braiding line diameter is below 0.2mm time, braiding machine starting up speed is controlled at 60%～70% of maximum operating speed, when braiding line diameter is 0.2mm and when above, braiding machine starting up speed is controlled at 50%～60% of maximum operating speed,
Braiding lay ratio is that pitch length/braid average diameter is controlled between 2～4.5, and count is not less than 90%;
The computing formula of count is:
M=2F -F2 (1)
F=and'/[π(D+2d')cosα] (2)
tg α=[π(d"+2d')]/H (3)
Kr={1+[π(d"+2d)/H]2}-1/2 (4)
In formula: M is that count is total coverage coefficient, F is that one side covers braiding coefficient, and tg α is braiding angle tangent, and Kr is braiding coefficient, H is lay of braiding, and d' is the rear line diameter of braiding, and a is braiding half number of spindle unit, n is braiding doubling radical, and α is braiding angle, d " weaves front line diameter.
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|---|---|
| CN105321627A (en) | 2016-02-10 |
| CN105321627B (en) | 2017-03-15 |
| CN103871615B (en) | 2016-03-09 |
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Denomination of invention: Rated voltage 6~35kv high elastic torsion resistant wind energy cable and its manufacturing method Effective date of registration: 20220719 Granted publication date: 20160309 Pledgee: Huizhou Commercial Bank Co.,Ltd. Wuhu Zhongshan South Road Branch Pledgor: SIAIT CABLE Co.,Ltd. Registration number: Y2022980010766 |