CN108231280A - A kind of manufacturing method and cable of the third insulated cable of water-tree-resistantmedium medium voltage second - Google Patents
A kind of manufacturing method and cable of the third insulated cable of water-tree-resistantmedium medium voltage second Download PDFInfo
- Publication number
- CN108231280A CN108231280A CN201711354868.1A CN201711354868A CN108231280A CN 108231280 A CN108231280 A CN 108231280A CN 201711354868 A CN201711354868 A CN 201711354868A CN 108231280 A CN108231280 A CN 108231280A
- Authority
- CN
- China
- Prior art keywords
- area
- temperature
- conductor
- insulation
- cable
- 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
Classifications
-
- 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
- H01B13/0016—Apparatus or processes specially adapted for manufacturing conductors or cables for heat treatment
- H01B13/002—Apparatus or processes specially adapted for manufacturing conductors or cables for heat treatment for heat extraction
-
- 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
- H01B13/148—Selection of the insulating material therefor
-
- 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
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
- H01B13/24—Sheathing; Armouring; Screening; Applying other protective layers by extrusion
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/02—Disposition of insulation
- H01B7/0275—Disposition of insulation comprising one or more extruded layers of insulation
-
- 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
- H01B9/027—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients composed of semi-conducting layers
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
A kind of manufacturing method and cable of the third insulated cable of water-tree-resistantmedium medium voltage second, the structure of cable are：Around same axis, from-inner-to-outer is conductor, conductor shield, insulating layer, insulation screen and restrictive coating successively；Form the conductor shield is crosslinked polyethylene semiconductive shieldin material；Form the insulating layer is ethylene propylene diene rubber Insulation Material；Form the insulation screen is rubber semiconductive shieldin material；Form the restrictive coating is polyethylene sheath material.The manufacturing method of the cable, step include：1) conductor is manufactured, 2) manufactures conductor shield, 3) manufactures insulating layer, 4) manufacture insulation screen, 5) dredge around bare copper wire, 6) extrude sheath material.The cable electrical property of cable is made in this method and mechanical performance is above standard requirement.
Description
Technical field
The technical program is related to field of cable technology, is specifically a kind of system of the third insulated cable of water-tree-resistantmedium medium voltage second
Make method and cable.
Background technology
Water resistant tree growth stimulator is the key factor of cable water tree resistant property.Manufacturing process is misorient may to destroy electricity
The water tree resistant property and electrical property of cable.
Especially for the new construction of cable for using water resistant tree growth stimulator, since new Cable Construction Design synthesis is examined
Consider the mechanically and electrically performance of cable, so, in general its structure technology is cured, unless it is absolutely necessary in the case of, no
Convenient for doing the adjustment of production adaptability again.So for the new construction of cable for using water resistant tree growth stimulator, previous knot is continued to use
The production method of structure cable is difficult to that high quality, high performance cable is made under normal conditions.
Invention content
In order to solve the above-mentioned problems in the prior art, the present invention proposes a kind of water-tree-resistantmedium medium voltage second of new construction
Third insulated cable and its manufacturing method.
A kind of the third insulated cable of water-tree-resistantmedium medium voltage second, structure are：Around same axis, from-inner-to-outer be successively conductor,
Conductor shield, insulating layer, insulation screen and restrictive coating；
More neutral conductors are embedded in restrictive coating, each medium-sized conductor is wound on outside insulation screen, and and insulation shielding
The outer wall of layer is closely connected；Spacing between adjacent neutral conductor is identical, and spacing is more than 0；
(neutral conductor is the conductor for being connect with neutral point in electric power system)
Form the conductor shield is crosslinked polyethylene semiconductive shieldin material；Form the insulating layer is ternary
Ethylene propylene rubber insulation material；Form the insulation screen is rubber semiconductive shieldin material；Form the restrictive coating is poly- second
Alkene protective cover material；
The sectional area of the conductor is not less than 500mm2；The thickness of conductor shield is not less than 0.61mm；The thickness of insulating layer
It spends for 5.33~6.35mm；The thickness of insulation screen is 1.40~2.67mm；The thickness of restrictive coating is 1.78~3.05mm；
The manufacturing method of the cable, step include：
1) conductor is manufactured：
It is circular conductor being twisted compression to form section by copper monofilament or aluminium monofilament；The sectional area of conductor is not less than
500mm2；
2) conductor shield is manufactured：
First semiconductive nylon tape outside conductor, then crosslinked polyethylene semiconductive shieldin material is extruded outside it；
Semiconductive nylon tape nominal thickness is 0.1~0.15mm (optimal is 0.12mm), and minimum cap rate is not less than 50%
(optimal is 65%)；
The semiconductive nylon tape is dried before use, and drying temperature is 50~60 DEG C, and drying time is no less than for 24 hours；It is cold
But to being sealed in time after room temperature；The semiconductive nylon tape of drying processing should use in 12h；
Preservation should be sealed in time for the semiconductive nylon tape for being not used and having broken a seal in production process；Around
Packet semiconductive nylon tape conductor should be transferred to next procedure step in 72h after the completion of semi-conductive tape is wrapped and be produced；
3) insulating layer is manufactured：
Ethylene propylene diene rubber Insulation Material is extruded outside conductor shield, forms insulating layer；
4) insulation screen is manufactured：
Semi-conductive insulation shield material XPB-30A is extruded outside insulating layer and forms insulation screen；
Step 2)~4) in, it extrudes crosslinked polyethylene semiconductive shieldin material, ethylene propylene diene rubber Insulation Material and partly leads
Electrical isolation shielding material XPB-30A is to be manufactured using three-layer co-extruded technique by rubber extruding machine, and three-layer co-extruded technological requirement is：
5) by step 1)~4) core is made；It is dredged outside the insulation screen of core around bare copper wire；It is the right side to dredge around direction
To it is 6~10 to dredge around lay ratio；
The quantity of bare copper wire is 6~32；The wire range of bare copper wire is：1.29~3.26mm；Bare copper wire dredge around when
Tension range be 15~30N；
Again in the wrapped nonwoven fabric belts of bare copper wire external series gap, lapping direction is left-hand；
Tension range when nonwoven fabric belts are wrapped is：5~10N；Nonwoven fabric belts put up state to be non-, between nonwoven fabric belts
Gap is ranging from：5~10mm；
Finally use bright and clean iron pan take-up；
6) step 5) is obtained drum to extrude on the paying out machine of production line mounted in sheath, is removed in unwrapping wire in step 5
Nonwoven fabric belts；Again by extruding the extruding machine extrude sheath material of production line.
Vitta can be embedded in the outer wall of the restrictive coating, to identify.
In the step 4), it is fed to discharging direction certainly, three-layer co-extruded body temperature control is as follows：
Crosslinked polyethylene semiconductive shieldin material squeeze out area's temperature range be 76~83 DEG C, two area's temperature ranges be 88~
92 DEG C, three area's temperature ranges be 94~98 DEG C；
Ethylene propylene diene rubber Insulation Material squeeze out area's temperature range be 66~72 DEG C, two area's temperature ranges are 78~84 DEG C,
Three area's temperature ranges are 87~91 DEG C；
Semi-conductive insulation shield material squeeze out area's temperature range be 68~73 DEG C, two area's temperature ranges are 76~81 DEG C, three
Area's temperature range is 88~94 DEG C, four area's temperature ranges are 96~100 DEG C；
Wherein：One area is pan feeding section, and 2nd area and 3rd area are fluxing zone, and 4th area are homogenizing zone；
From being fed to discharging direction, the head unit warm area of rubber extruding machine is：One area's temperature range is 94~98 DEG C, 2nd area
Temperature range is 95~96 DEG C, three area's temperature ranges are 89~92 DEG C；
Wherein：One area is head section, 2nd area are machine cervical part of esophagus, 3rd area are die orifice section；
Cooling is cooled down using cold water；
In the step 6), it is fed to discharging direction certainly, each area's Temperature Distribution of fuselage of extruding machine is：One area's temperature model
To enclose be 152~158 DEG C, two area's temperature ranges are 160~166 DEG C, three area's temperature ranges are 173~180 DEG C, four area's temperature models
It is 182~188 DEG C to enclose, wherein：One area is pan feeding section, and 2nd area and 3rd area are fluxing zone, and 4th area are homogenizing zone；
The head unit temperature of extruding machine is：Head be temperature range be 182~188 DEG C, machine neck is that temperature range is
182~188 DEG C, die orifice for temperature range be 182~188 DEG C；
Sheath should use sub-sectional cooling, and first segment bosh water temperature is 60~70 DEG C, and other sections use normal-temperature water.
Description of the drawings
Fig. 1 is cross-section of cable schematic diagram made from the example method,
In figure：1 --- conductor；2 --- conductor shield；3 --- insulating layer；4 --- insulation screen；5 --- it is neutral
Conductor (bare copper wire)；6 --- restrictive coating；7 --- vitta.
Specific embodiment
This case is illustrated with specific embodiment below in conjunction with the accompanying drawings：
A kind of the third insulated cable of water-tree-resistantmedium medium voltage second as shown in Figure 1, structure are：Around same axis, from-inner-to-outer
It is conductor, conductor shield, insulating layer, insulation screen and restrictive coating successively；
More neutral conductors are embedded in restrictive coating, each medium-sized conductor is wound on outside insulation screen, and and insulation shielding
The outer wall of layer is closely connected；Spacing between adjacent neutral conductor is identical, and spacing is more than 0；
(neutral conductor is the conductor for being connect with neutral point in electric power system)
Form the conductor shield is that (it is YPJ- that the present embodiment selects the trade mark to crosslinked polyethylene semiconductive shieldin material
10)；
Form the insulating layer is that (the present embodiment selects the trade mark to contain water resistant for XJ-30B to ethylene propylene diene rubber Insulation Material
Set growth stimulator)
Form the insulation screen is rubber semiconductive shieldin material (the rubber-covered material of doping carbon black, the present embodiment
It is XPB-30A to select the trade mark)；
Form the restrictive coating is polyethylene sheath material (the present embodiment selects LLDPE linear low density polyethylene)；
The sectional area of the conductor is not less than 500mm2；The thickness of conductor shield is not less than 0.61mm；The thickness of insulating layer
It spends for 5.33~6.35mm；The thickness of insulation screen is 1.40~2.67mm；The thickness of restrictive coating is 1.78~3.05mm；
The manufacturing method of the cable, step include：
1) conductor is manufactured：
It is circular conductor being twisted compression to form section by copper monofilament or aluminium monofilament；The sectional area of conductor is not less than
500mm2；
2) conductor shield is manufactured：
First semiconductive nylon tape outside conductor, then crosslinked polyethylene semiconductive shieldin material is extruded outside it；
Semiconductive nylon tape nominal thickness is 0.1~0.15mm (through experiment, optimal is 0.12mm), and minimum cap rate is not
Less than 50%, (through experiment, 65%) optimal is；
The semiconductive nylon tape is dried before use, and drying temperature is 50~60 DEG C, and drying time is no less than for 24 hours；It is cold
But to being sealed in time after room temperature；The semiconductive nylon tape of drying processing should use in 12h；
Preservation should be sealed in time for the semiconductive nylon tape for being not used and having broken a seal in production process；Around
Packet semiconductive nylon tape conductor should be transferred to next procedure step in 72h after the completion of semi-conductive tape is wrapped and be produced；
3) insulating layer is manufactured：
Ethylene propylene diene rubber Insulation Material is extruded outside conductor shield, forms insulating layer；
4) insulation screen is manufactured：
Semi-conductive insulation shield material XPB-30A is extruded outside insulating layer and forms insulation screen；
Step 2)~4) in, it extrudes crosslinked polyethylene semiconductive shieldin material, ethylene propylene diene rubber Insulation Material and partly leads
Electrical isolation shielding material XPB-30A is to be manufactured using three-layer co-extruded technique by rubber extruding machine, and three-layer co-extruded technological requirement is：
5) by step 1)~4) core is made；It is thin outside the insulation screen of core that around bare copper wire, (neutrality i.e. in figure is led
Body)；It is dextrad to dredge around direction, and it is 6~10 to dredge around lay ratio；
The quantity of bare copper wire is 6~32；The wire range of bare copper wire is：1.29~3.26mm；Bare copper wire dredge around when
Tension range be 15~30N；
Again in the wrapped nonwoven fabric belts of bare copper wire external series gap, lapping direction is left-hand；
Tension range when nonwoven fabric belts are wrapped is：5~10N；Nonwoven fabric belts put up state to be non-, between nonwoven fabric belts
Gap is ranging from：5~10mm；
Finally use bright and clean iron pan take-up；
6) step 5) is obtained drum to extrude on the paying out machine of production line mounted in sheath, is removed in unwrapping wire in step 5
Nonwoven fabric belts；Again by extruding the extruding machine extrude sheath material of production line.
Vitta can be embedded in the outer wall of the restrictive coating, to identify.
In the production method of this cable, the technology controlling and process of each layer CABLE MATERIALS is for cable processing quality in itself and production
The electrical property of product is affected, therefore is controlled using following technological requirement：
In the step 4), it is fed to discharging direction certainly, three-layer co-extruded body temperature control is as follows：
Crosslinked polyethylene semiconductive shieldin material squeeze out area's temperature range be 76~83 DEG C, two area's temperature ranges be 88~
92 DEG C, three area's temperature ranges be 94~98 DEG C；
Ethylene propylene diene rubber Insulation Material squeeze out area's temperature range be 66~72 DEG C, two area's temperature ranges are 78~84 DEG C,
Three area's temperature ranges are 87~91 DEG C；
Semi-conductive insulation shield material squeeze out area's temperature range be 68~73 DEG C, two area's temperature ranges are 76~81 DEG C, three
Area's temperature range is 88~94 DEG C, four area's temperature ranges are 96~100 DEG C；
Wherein：One area is pan feeding section, and 2nd area and 3rd area are fluxing zone, and 4th area are homogenizing zone；
From being fed to discharging direction, the head unit warm area of rubber extruding machine is：One area's temperature range is 94~98 DEG C, 2nd area
Temperature range is 95~96 DEG C, three area's temperature ranges are 89~92 DEG C；
Wherein：One area is head section, 2nd area are machine cervical part of esophagus, 3rd area are die orifice section；
Cooling is cooled down using cold water；
In the step 6), it is fed to discharging direction certainly, each area's Temperature Distribution of fuselage of extruding machine is：One area's temperature model
To enclose be 152~158 DEG C, two area's temperature ranges are 160~166 DEG C, three area's temperature ranges are 173~180 DEG C, four area's temperature models
It is 182~188 DEG C to enclose, wherein：One area is pan feeding section, and 2nd area and 3rd area are fluxing zone, and 4th area are homogenizing zone；
The head unit temperature of extruding machine is：Head be temperature range be 182~188 DEG C, machine neck is that temperature range is
182~188 DEG C, die orifice for temperature range be 182~188 DEG C；
Sheath should use sub-sectional cooling, and first segment bosh water temperature is 60~70 DEG C, and other sections use normal-temperature water.
Example 1：
In the step 4), it is fed to discharging direction certainly, three-layer co-extruded body temperature control is as follows：
Crosslinked polyethylene semiconductive shieldin material squeezes out that area's temperature is 76 DEG C, two area's temperature are 88 DEG C, three area's temperature are 98
℃；
Ethylene propylene diene rubber Insulation Material squeezes out that area's temperature is 66 DEG C, two area's temperature are 84 DEG C, three area's temperature are 87 DEG C；
Semi-conductive insulation shield material squeeze out area's temperature be 73 DEG C, two area's temperature are 76 DEG C, three area's temperature are 88 DEG C, four
Area's temperature is 100 DEG C；
From being fed to discharging direction, the head unit warm area of rubber extruding machine is：One area's temperature is 94 DEG C, two area's temperature are 95
DEG C, three area's temperature be 92 DEG C；
In the step 6), it is fed to discharging direction certainly, each area's Temperature Distribution of fuselage of extruding machine is：One area's temperature is
152 DEG C, two area's temperature be 166 DEG C, three area's temperature are 180 DEG C, four area's temperature are 182 DEG C；
The head unit temperature of extruding machine is：Head be temperature be 182 DEG C, machine neck be temperature be 182 DEG C, die orifice is temperature
Degree is 182 DEG C；
Sheath should use sub-sectional cooling, and first segment bosh water temperature is 60 DEG C, and other sections use normal-temperature water.
Example 2
In the step 4), it is fed to discharging direction certainly, three-layer co-extruded body temperature control is as follows：
Crosslinked polyethylene semiconductive shieldin material squeezes out that area's temperature is 83 DEG C, two area's temperature are 92 DEG C, three area's temperature are 94
℃；
Ethylene propylene diene rubber Insulation Material squeezes out that area's temperature is 72 DEG C, two area's temperature are 78 DEG C, three area's temperature are 91 DEG C；
Semi-conductive insulation shield material squeeze out area's temperature be 68 DEG C, two area's temperature are 81 DEG C, three area's temperature are 94 DEG C, four
Area's temperature is 96 DEG C；
From being fed to discharging direction, the head unit warm area of rubber extruding machine is：One area's temperature is 98 DEG C, two area's temperature are 96
DEG C, three area's temperature be 89 DEG C；
In the step 6), it is fed to discharging direction certainly, each area's Temperature Distribution of fuselage of extruding machine is：One area's temperature is
158 DEG C, two area's temperature be 160 DEG C, three area's temperature are 173 DEG C, four area's temperature are 188 DEG C；
The head unit temperature of extruding machine is：Head be temperature range be 188 DEG C, machine neck be temperature range be 188 DEG C,
Die orifice is 188 DEG C for temperature range；
Sheath should use sub-sectional cooling, and first segment bosh water temperature is 70 DEG C, and other sections use normal-temperature water.
Example 3：
In the step 4), it is fed to discharging direction certainly, three-layer co-extruded body temperature control is as follows：
Crosslinked polyethylene semiconductive shieldin material squeezes out that area's temperature is 80 DEG C, two area's temperature are 90 DEG C, three area's temperature are 95
℃；
Ethylene propylene diene rubber Insulation Material squeezes out that area's temperature is 70 DEG C, two area's temperature are 80 DEG C, three area's temperature are 90 DEG C；
Semi-conductive insulation shield material squeeze out area's temperature be 70 DEG C, two area's temperature are 80 DEG C, three area's temperature are 90 DEG C, four
Area's temperature is 100 DEG C；
From being fed to discharging direction, the head unit warm area of rubber extruding machine is：One area's temperature is 95 DEG C, two area's temperature are 95
DEG C, three area's temperature be 90 DEG C；Wherein, an area is head section, 2nd area are machine cervical part of esophagus, 3rd area are die orifice section；
Cooling is cooled down using cold water；
In the step 6), it is fed to discharging direction certainly, each area's Temperature Distribution of fuselage of extruding machine is：One area's temperature is
155 DEG C, two area's temperature be 165 DEG C, three area's temperature are 175 DEG C, four area's temperature are 185 DEG C, wherein：One area be pan feeding section, 2nd area
It is fluxing zone with 3rd area, 4th area are homogenizing zone；
The head unit temperature of extruding machine is：Head be temperature be 185 DEG C, machine neck be temperature be 185 DEG C, die orifice is temperature
Degree is 185 DEG C；
Sheath should use sub-sectional cooling, and first segment bosh water temperature is 68 DEG C, and other sections use normal-temperature water.
It is counted through trial production, the electrical property that cable is made in 1~3 technique of example can be up to standard, and qualified.
It is 98.7% that the quality product rate of cable, which is made, in 1 technique of example, and the quality product rate that cable is made in 2 technique of example is 99.5%, example 3
The quality product rate that cable is made in technique is 99.8%.
This method is made cable, and testing result is as follows, and (test basis is：ICEA S-94-649)：
1st, insulate mechanical performance：
Pristine tensile strength is 14.4MPa (it is required that for >=8.2MPa)；
Original broken elongation is 480% (it is required that being >=250%)；
By 121 degrees Celsius, after aging in 168 hours,
Tensile strength retention rate is 92% (it is required that being >=80%)；
Reserved elongation at break is 94% (it is required that being >=80%)；
2nd, 150 degrees Celsius, thermal creep in 15 minutes
The lower maximum elongation rate of load is 10% (it is required that being≤50%)；
Maximum extension is 0 (it is required that being≤5%) after cooling；
3rd, the original continuation performance of sheath
Tensile strength 25.8MPa (it is required that for >=11.7MPa)；
Elongation at break is 860% (it is required that being >=300%)；
By 100 degrees Celsius, after aging in 48 hours,
Tensile strength retention rate is 90% (it is required that being >=75%)；
Reserved elongation at break is 85% (it is required that being >=75%)；
4th, conductor shielding：
It does not extend in insulation more than 0.124mm, until being more than the protrusion of 0.18mm in conductor shielding；
Twisted fold is no more than 0.18mm；
Extrude the micropore that the interface between conductor shielding and insulation is not greater than 0.076mm.
5th, insulation shielding：
There is no any micropore more than 5mils；
It does not extend to more than 5mils in insulating, until raised and irregular more than 7mils in extruded insulation shielding.
6th, insulation shielding impression is 0.182mm (it is required that being≤0.381mm)；
7th, 25 degrees Celsius of conductor DC resistances are 0.164 Ω/km (it is required that being≤0.171 Ω/km)；
8th, ac voltage withstanding experiment (35kV/5min)：Without breakdown (it is required that being without breakdown)；
9th, partial discharge test (35kV) is 2.5PC (it is required that being≤5PC)；
10th, 15.6 degrees Celsius of insulation resistances are 10200M Ω km (it is required that being >=6080M Ω km).
Load cycle is tested after 14 days：
1st, electric measurement
As a result：
Partial discharge test (35kV) is 1.8PC (it is required that being≤5PC)；
Capacitance (15kV, room temperature) is 322pF/m；
The dielectric constant calculated according to capacitance：0.0414 × 332 × 1g (D/d)=2.62 (D is the outer insulation diameter measured,
D is the conductor shielding outer diameter measured) (it is required that being≤4.0)；
Dielectric absorption (15kV, room temperature)：0.15 (it is required that being≤1.5)
2nd, high-voltage time is tested
Experimental method：
50Hz, 17.5kV alternating current at room temperature, continue 5 minutes, and then, incrementally 7kV, each voltage value are lasting every time
5 minutes, until breakdown.
As a result：
Ac breakdown voltage 143.5kV, hold time 2 points 46 seconds；
Ac voltage withstanding grade：136.5kV (it is required that being >=19.7kV)；
Ac voltage withstanding value：31.0kV/mm.
3rd, thermal shock test
Experimental method：
Conductor temperature is 125~130 degrees Celsius；
10 110kV positive pulses, 10 110kV negative pulses.Then voltage is increased with 27.5kV steppings, meanwhile, Mei Ge electricity
Pressure value applies 3 negative pulses, until breakdown.
As a result：
10 110kV positive pulses, 10 110kV negative pulses, no breakdown；
Puncture impulse voltage is 220kV；
Puncture impulse voltage grade is 192.5kV；
Minimal impact pressure voltage is 43.75kV/mm (it is required that being >=31.5kV).
After load cycle 14 days, then carry out accelerating within 120 days water tree experiment：
1st, electric measurement
As a result：
Partial discharge test (35kV) is 2.1PC (it is required that being≤5PC)；
Capacitance (15kV, room temperature) is 322pF/m；
The dielectric constant calculated according to capacitance：0.0414 × 332 × 1g (D/d)=2.67 (D is the outer insulation diameter measured,
D is the conductor shielding outer diameter measured) (it is required that being≤4.0)；
Dielectric absorption (15kV, room temperature)：0.16 (it is required that being≤1.5)
2nd, high-voltage time is tested
Experimental method：
50Hz, 17.5kV alternating current at room temperature, continue 5 minutes, and then, incrementally 7kV, each voltage value are lasting every time
5 minutes, until breakdown.
As a result：
Ac breakdown voltage 136.5kV, hold time 3 points 28 seconds；
Ac voltage withstanding grade：129.5kV (it is required that being >=19.7kV)；
Ac voltage withstanding value：29.4kV/mm.
After load cycle 14 days, then carry out accelerating within 180 days water tree experiment：
High-voltage time is tested
Experimental method：
50Hz, 17.5kV alternating current at room temperature, continue 5 minutes, and then, incrementally 7kV, each voltage value are lasting every time
5 minutes, until breakdown.
As a result：
Ac breakdown voltage 136.5kV, hold time 2 points 24 seconds；
Ac voltage withstanding grade：129.5kV (it is required that being >=19.7kV)；
Ac voltage withstanding value：29.4kV/mm.
After load cycle 14 days, then carry out accelerating within 360 days water tree experiment：
High-voltage time is tested
Experimental method：
50Hz, 17.5kV alternating current at room temperature, continue 5 minutes, and then, incrementally 7kV, each voltage value are lasting every time
5 minutes, until breakdown.
As a result：
Ac breakdown voltage 129.5kV, hold time 1 point 29 seconds；
Ac voltage withstanding grade：122.5kV (it is required that being >=19.7kV)；
Ac voltage withstanding value：27.8kV/mm.
Claims (8)
1. a kind of manufacturing method of the third insulated cable of water-tree-resistantmedium medium voltage second, it is characterized in that
The structure of the cable is：Around same axis, from-inner-to-outer is conductor, conductor shield, insulating layer, insulation screen successively
Cover layer and restrictive coating；
Be embedded with more neutral conductors in restrictive coating, each medium-sized conductor is wound on outside insulation screen, and with insulation screen
Outer wall is closely connected；Spacing between adjacent neutral conductor is identical, and spacing is more than 0；
Form the conductor shield is crosslinked polyethylene semiconductive shieldin material；Form the insulating layer is ethylene-propylene-diene monomer
Glue Insulation Material；Form the insulation screen is rubber semiconductive shieldin material；Form the restrictive coating is pe sheath
Material；
The sectional area of the conductor is not less than 500mm2；The thickness of conductor shield is not less than 0.61mm；The thickness of insulating layer is
5.33~6.35mm；The thickness of insulation screen is 1.40~2.67mm；The thickness of restrictive coating is 1.78~3.05mm；
The manufacturing method of the cable, step include：
1) conductor is manufactured：
It is circular conductor being twisted compression to form section by copper monofilament or aluminium monofilament；The sectional area of conductor is not less than 500mm2；
2) conductor shield is manufactured：
First semiconductive nylon tape outside conductor, then crosslinked polyethylene semiconductive shieldin material is extruded outside it；
Semiconductive nylon tape nominal thickness is 0.1~0.15mm, and cap rate is not less than 50%；
The semiconductive nylon tape is dried before use, and drying temperature is 50~60 DEG C, and drying time is no less than for 24 hours；It is cooled to
It is sealed in time after room temperature；The semiconductive nylon tape of drying processing should use in 12h；
Preservation should be sealed in time for the semiconductive nylon tape for being not used and having broken a seal in production process；It is wrapped partly to lead
Electric nylon tape conductor should be transferred to next procedure step in 72h after the completion of semi-conductive tape is wrapped and be produced；
3) insulating layer is manufactured：
Ethylene propylene diene rubber Insulation Material is extruded outside conductor shield, forms insulating layer；
4) insulation screen is manufactured：
Semi-conductive insulation shield material is extruded outside insulating layer and forms insulation screen；
Step 2)~4) in, it is exhausted to extrude crosslinked polyethylene semiconductive shieldin material, ethylene propylene diene rubber Insulation Material and semiconductive
Edge shielding material is to be manufactured using three-layer co-extruded technique by rubber extruding machine；
5) by step 1)~4) core is made；It is dredged outside the insulation screen of core around bare copper wire；Dredge around direction be dextrad, dredge around
Lay ratio is 6~10；
The quantity of bare copper wire is 6~32；The wire range of bare copper wire is：1.29~3.26mm；Bare copper wire dredge around when
Power ranging from 15~30N；
Again in the wrapped nonwoven fabric belts of bare copper wire external series gap, lapping direction is left-hand；
Tension range when nonwoven fabric belts are wrapped is：5~10N；Nonwoven fabric belts put up state, nonwoven fabric belts interstice coverage to be non-
For：5~10mm；
Finally use bright and clean iron pan take-up；
6) step 5) is obtained drum to extrude on the paying out machine of production line mounted in sheath, the nonwoven in step 5 is removed in unwrapping wire
Strap；Again by extruding the extruding machine extrude sheath material of production line.
In the step 4), three-layer co-extruded technological requirement is：
From discharging direction is fed to, three-layer co-extruded body temperature control is as follows：
Crosslinked polyethylene semiconductive shieldin material squeeze out area's temperature range be 76~83 DEG C, two area's temperature ranges are 88~92 DEG C,
Three area's temperature ranges are 94~98 DEG C；
Ethylene propylene diene rubber Insulation Material squeezes out that area's temperature range is 66~72 DEG C, two area's temperature ranges are 78~84 DEG C, 3rd area
Temperature range is 87~91 DEG C；
Semi-conductive insulation shield material squeezes out that area's temperature range is 68~73 DEG C, two area's temperature ranges are 76~81 DEG C, three area's temperature
Degree range is 88~94 DEG C, four area's temperature ranges are 96~100 DEG C；
Wherein：One area is pan feeding section, and 2nd area and 3rd area are fluxing zone, and 4th area are homogenizing zone；
From being fed to discharging direction, the head unit warm area of rubber extruding machine is：One area's temperature range is 94~98 DEG C, two area's temperature models
It is 95~96 DEG C to enclose, three area's temperature ranges are 89~92 DEG C；
Wherein：One area is head section, 2nd area are machine cervical part of esophagus, 3rd area are die orifice section；
Cooling is cooled down using cold water；
In the step 6), it is fed to discharging direction certainly, each area's Temperature Distribution of fuselage of extruding machine is：One area's temperature range is
152~158 DEG C, two area's temperature ranges be 160~166 DEG C, three area's temperature ranges are 173~180 DEG C, four area's temperature ranges are
182~188 DEG C, wherein：One area is pan feeding section, and 2nd area and 3rd area are fluxing zone, and 4th area are homogenizing zone；
The head unit temperature of extruding machine is：Head be temperature range be 182~188 DEG C, machine neck be temperature range be 182~
188 DEG C, die orifice for temperature range be 182~188 DEG C；
Sheath should use sub-sectional cooling, and first segment bosh water temperature is 60~70 DEG C, and other sections use normal-temperature water.
2. the manufacturing method of cable according to claim 1, it is characterized in that the outer wall of the restrictive coating is embedded with vitta.
3. the manufacturing method of cable according to claim 1, it is characterized in that
In the step 4), it is fed to discharging direction certainly, three-layer co-extruded body temperature control is as follows：
Crosslinked polyethylene semiconductive shieldin material squeezes out that area's temperature is 76 DEG C, two area's temperature are 88 DEG C, three area's temperature are 98 DEG C；
Ethylene propylene diene rubber Insulation Material squeezes out that area's temperature is 66 DEG C, two area's temperature are 84 DEG C, three area's temperature are 87 DEG C；
Semi-conductive insulation shield material squeezes out that area's temperature is 73 DEG C, two area's temperature are 76 DEG C, three area's temperature are 88 DEG C, four area's temperature
It is 100 DEG C；
From being fed to discharging direction, the head unit warm area of rubber extruding machine is：One area's temperature is 94 DEG C, two area's temperature are 95 DEG C, three
Area's temperature is 92 DEG C；
In the step 6), it is fed to discharging direction certainly, each area's Temperature Distribution of fuselage of extruding machine is：One area's temperature is 152 DEG C,
Two area's temperature are 166 DEG C, three area's temperature are 180 DEG C, four area's temperature are 182 DEG C；
The head unit temperature of extruding machine is：Head be temperature be 182 DEG C, machine neck be temperature be 182 DEG C, die orifice is that temperature is
182℃；
Sheath should use sub-sectional cooling, and first segment bosh water temperature is 60 DEG C, and other sections use normal-temperature water.
4. the manufacturing method of cable according to claim 1, it is characterized in that
In the step 4), it is fed to discharging direction certainly, three-layer co-extruded body temperature control is as follows：
Crosslinked polyethylene semiconductive shieldin material squeezes out that area's temperature is 83 DEG C, two area's temperature are 92 DEG C, three area's temperature are 94 DEG C；
Ethylene propylene diene rubber Insulation Material squeezes out that area's temperature is 72 DEG C, two area's temperature are 78 DEG C, three area's temperature are 91 DEG C；
Semi-conductive insulation shield material squeezes out that area's temperature is 68 DEG C, two area's temperature are 81 DEG C, three area's temperature are 94 DEG C, four area's temperature
It is 96 DEG C；
From being fed to discharging direction, the head unit warm area of rubber extruding machine is：One area's temperature is 98 DEG C, two area's temperature are 96 DEG C, three
Area's temperature is 89 DEG C；
In the step 6), it is fed to discharging direction certainly, each area's Temperature Distribution of fuselage of extruding machine is：One area's temperature is 158 DEG C,
Two area's temperature are 160 DEG C, three area's temperature are 173 DEG C, four area's temperature are 188 DEG C；
The head unit temperature of extruding machine is：Head be temperature range be 188 DEG C, machine neck be temperature range be 188 DEG C, die orifice is
Temperature range is 188 DEG C；
Sheath should use sub-sectional cooling, and first segment bosh water temperature is 70 DEG C, and other sections use normal-temperature water.
5. the manufacturing method of cable according to claim 1, it is characterized in that
In the step 4), it is fed to discharging direction certainly, three-layer co-extruded body temperature control is as follows：
Crosslinked polyethylene semiconductive shieldin material squeezes out that area's temperature is 80 DEG C, two area's temperature are 90 DEG C, three area's temperature are 95 DEG C；
Ethylene propylene diene rubber Insulation Material squeezes out that area's temperature is 70 DEG C, two area's temperature are 80 DEG C, three area's temperature are 90 DEG C；
Semi-conductive insulation shield material squeezes out that area's temperature is 70 DEG C, two area's temperature are 80 DEG C, three area's temperature are 90 DEG C, four area's temperature
It is 100 DEG C；
From being fed to discharging direction, the head unit warm area of rubber extruding machine is：One area's temperature is 95 DEG C, two area's temperature are 95 DEG C, three
Area's temperature is 90 DEG C；Wherein, an area is head section, 2nd area are machine cervical part of esophagus, 3rd area are die orifice section；
Cooling is cooled down using cold water；
In the step 6), it is fed to discharging direction certainly, each area's Temperature Distribution of fuselage of extruding machine is：One area's temperature is 155 DEG C,
Two area's temperature are 165 DEG C, three area's temperature are 175 DEG C, four area's temperature are 185 DEG C, wherein：One area is pan feeding section, 2nd area and 3rd area
For fluxing zone, 4th area are homogenizing zone；
The head unit temperature of extruding machine is：Head be temperature be 185 DEG C, machine neck be temperature be 185 DEG C, die orifice is that temperature is
185℃；
Sheath should use sub-sectional cooling, and first segment bosh water temperature is 68 DEG C, and other sections use normal-temperature water.
6. a kind of cable as made from Claims 1 to 5 either method, it is characterized in that the structure of the cable is：Around same
Axis, from-inner-to-outer are conductor, conductor shield, insulating layer, insulation screen and restrictive coating successively；
Be embedded with more neutral conductors in restrictive coating, each medium-sized conductor is wound on outside insulation screen, and with insulation screen
Outer wall is closely connected；Spacing between adjacent neutral conductor is identical, and spacing is more than 0；
Form the conductor shield is crosslinked polyethylene semiconductive shieldin material；Form the insulating layer is ethylene-propylene-diene monomer
Glue Insulation Material；Form the insulation screen is rubber semiconductive shieldin material；Form the restrictive coating is pe sheath
Material；
The sectional area of the conductor is not less than 500mm2；The thickness of conductor shield is not less than 0.61mm；The thickness of insulating layer is
5.33~6.35mm；The thickness of insulation screen is 1.40~2.67mm；The thickness of restrictive coating is 1.78~3.05m.
7. the manufacturing method of cable according to claim 7, it is characterized in that between outside the conductor shield and conductor
It is surrounded with semiconductive nylon tape；Semiconductive nylon tape nominal thickness is 0.1~0.15mm, and cap rate is not less than 50%.
8. the manufacturing method of cable according to claim 7, it is characterized in that the semiconductive nylon tape nominal thickness is
0.12mm, cap rate 65%.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711354868.1A CN108231280B (en) | 2017-12-15 | 2017-12-15 | Manufacturing method of water tree-resistant medium-voltage ethylene propylene insulated cable and cable |
| PCT/CN2018/117531 WO2019114533A1 (en) | 2017-12-15 | 2018-11-26 | Method for manufacturing water-tree retardant medium-voltage ethylene-propylene insulated cable, and cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711354868.1A CN108231280B (en) | 2017-12-15 | 2017-12-15 | Manufacturing method of water tree-resistant medium-voltage ethylene propylene insulated cable and cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108231280A true CN108231280A (en) | 2018-06-29 |
| CN108231280B CN108231280B (en) | 2020-01-07 |
Family
ID=62649656
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711354868.1A Active CN108231280B (en) | 2017-12-15 | 2017-12-15 | Manufacturing method of water tree-resistant medium-voltage ethylene propylene insulated cable and cable |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN108231280B (en) |
| WO (1) | WO2019114533A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019114533A1 (en) * | 2017-12-15 | 2019-06-20 | 江苏上上电缆集团有限公司 | Method for manufacturing water-tree retardant medium-voltage ethylene-propylene insulated cable, and cable |
| CN111261339A (en) * | 2020-01-22 | 2020-06-09 | 南方电网科学研究院有限责任公司 | Cable processing method |
| CN114464352A (en) * | 2022-02-14 | 2022-05-10 | 江西华缆科技有限公司 | Low-smoke halogen-free three-layer extruded cable and production equipment and process thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113793729A (en) * | 2021-09-09 | 2021-12-14 | 江苏亨通电力电缆有限公司 | Medium-voltage feeder cable and preparation method and application thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0966003A1 (en) * | 1998-06-16 | 1999-12-22 | Union Carbide Chemicals & Plastics Technology Corporation | Tree resistant cable |
| CN201036057Y (en) * | 2007-04-03 | 2008-03-12 | 昆明电缆股份有限公司 | Anti-false cable |
| CN105957629A (en) * | 2016-07-13 | 2016-09-21 | 山东科虹线缆科技股份有限公司 | Nano graphene medium voltage power cable and manufacturing method thereof |
| CN106098239A (en) * | 2016-08-16 | 2016-11-09 | 远东电缆有限公司 | A kind of wisdom energy water resistant tree-shaped midium voltage cable and production technology |
| CN106373646A (en) * | 2016-08-26 | 2017-02-01 | 江苏上上电缆集团有限公司 | Wear-resistant, drag-resistant and low-temperature resistant flexible cable and fabrication method thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202275636U (en) * | 2011-10-18 | 2012-06-13 | 宁波东方电缆股份有限公司 | Innovative environmental-friendly submarine cable |
| US20140202732A1 (en) * | 2013-01-23 | 2014-07-24 | Alfred Mendelsohn | Power cable design |
| CN102982879A (en) * | 2012-11-28 | 2013-03-20 | 安徽埃克森科技集团有限公司 | High-temperature-resistant and high-voltage-resistant power cable |
| CN108231280B (en) * | 2017-12-15 | 2020-01-07 | 江苏上上电缆集团有限公司 | Manufacturing method of water tree-resistant medium-voltage ethylene propylene insulated cable and cable |
-
2017
- 2017-12-15 CN CN201711354868.1A patent/CN108231280B/en active Active
-
2018
- 2018-11-26 WO PCT/CN2018/117531 patent/WO2019114533A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0966003A1 (en) * | 1998-06-16 | 1999-12-22 | Union Carbide Chemicals & Plastics Technology Corporation | Tree resistant cable |
| CN201036057Y (en) * | 2007-04-03 | 2008-03-12 | 昆明电缆股份有限公司 | Anti-false cable |
| CN105957629A (en) * | 2016-07-13 | 2016-09-21 | 山东科虹线缆科技股份有限公司 | Nano graphene medium voltage power cable and manufacturing method thereof |
| CN106098239A (en) * | 2016-08-16 | 2016-11-09 | 远东电缆有限公司 | A kind of wisdom energy water resistant tree-shaped midium voltage cable and production technology |
| CN106373646A (en) * | 2016-08-26 | 2017-02-01 | 江苏上上电缆集团有限公司 | Wear-resistant, drag-resistant and low-temperature resistant flexible cable and fabrication method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019114533A1 (en) * | 2017-12-15 | 2019-06-20 | 江苏上上电缆集团有限公司 | Method for manufacturing water-tree retardant medium-voltage ethylene-propylene insulated cable, and cable |
| CN111261339A (en) * | 2020-01-22 | 2020-06-09 | 南方电网科学研究院有限责任公司 | Cable processing method |
| CN114464352A (en) * | 2022-02-14 | 2022-05-10 | 江西华缆科技有限公司 | Low-smoke halogen-free three-layer extruded cable and production equipment and process thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019114533A1 (en) | 2019-06-20 |
| CN108231280B (en) | 2020-01-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108231280A (en) | A kind of manufacturing method and cable of the third insulated cable of water-tree-resistantmedium medium voltage second | |
| CN106373646B (en) | A kind of wear-resisting anti-low temperature resistant flexible cable of towing and preparation method thereof | |
| CN109378136B (en) | Manufacturing method of environment-friendly medium-voltage power cable and cable | |
| CN107154285A (en) | The manufacture method and cable of a kind of high electric energy transmission dress cable in stock | |
| WO2020119308A1 (en) | Method for fabricating hollow electric cable for charging new energy vehicle and electric cable | |
| WO2021073272A1 (en) | Radiation-resistant small-cross-section high-voltage direct-current cable for nuclear power plant and manufacturing method therefor | |
| CN105390202B (en) | Cable in control cabinet and manufacturing method of cable | |
| CN201122456Y (en) | High voltage power cable with embedded temperature-measuring optical fibre cable | |
| CN105448413B (en) | A kind of semicircle conductors power cable and its manufacture method | |
| CN112038001A (en) | Manufacturing method of single-phase alternating current fireproof high-voltage cable for railway engineering | |
| CN106373635A (en) | High-temperature resistant cable for nuclear power plant and fabrication method of cable | |
| CN104103379B (en) | The medium-pressure power cable production technology of crosslinked polyetylene insulated nonextruding shielding | |
| CN105427922A (en) | High-voltage direct current cable and manufacturing method and insulation material therefor | |
| CN111029027A (en) | Intelligent self-checking environment-friendly medium-voltage cable and manufacturing method thereof | |
| CN105957629A (en) | Nano graphene medium voltage power cable and manufacturing method thereof | |
| CN205810467U (en) | Flat power cable | |
| CN216596986U (en) | Modified polypropylene insulation cable for rail transit | |
| CN109326377A (en) | A kind of electric power safeguard special vehicle locomotive cable and preparation method thereof | |
| CN214336436U (en) | LNG ultra-low temperature direct current molded lines middling pressure coaxial cable | |
| CN218274107U (en) | Silicon rubber insulation medium-voltage mining flexible cable | |
| CN218939264U (en) | High-voltage coaxial flexible cable | |
| CN110993180A (en) | High-voltage pulse transmission cable and preparation method thereof | |
| CN112331395A (en) | Motor lead cable and preparation method and application thereof | |
| CN110706862A (en) | Forming method for power line production and preparation | |
| CN209674977U (en) | Urban distribution network power supply system 10kV cable |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |