CN110610783A - Manufacturing method of control cable used in third-generation nuclear power station containment vessel - Google Patents
Manufacturing method of control cable used in third-generation nuclear power station containment vessel Download PDFInfo
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- 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
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- 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
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- 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
- H01B13/003—Apparatus or processes specially adapted for manufacturing conductors or cables using irradiation
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- 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
- H01B13/02—Stranding-up
- H01B13/0235—Stranding-up by a twisting device situated between a pay-off device and a take-up device
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- 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
- H01B13/141—Insulating conductors or cables by extrusion of two or more insulating layers
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- 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
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- 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
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- 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
- H01B13/26—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping
- H01B13/2613—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping by longitudinal lapping
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Abstract
The invention discloses a manufacturing method of a control cable used in a third generation nuclear power station containment vessel, which comprises the following steps: s1 selecting materials; s2 wire drawing; s3 annealing and tinning; s4 twisting the conductor; s5 co-extruding and coating the inner insulating layer and the outer insulating layer; s6 irradiation crosslinking; s7 wrapping the insulated wire core; s8 cabling; s9 packing layer extrusion; s10 shielding; s11 extruding the outer sheath layer; s12 irradiation crosslinking; s13 performance test; and S14 packaging and warehousing the finished product. The insulating and sheath material is made of a high polymer material with the thermal life longer than 60 years after long-term heat resistance evaluation, and the manufactured cable has the service life longer than 60 years when the conductor is at the long-term working temperature of 90 ℃, and can resist normal working condition radiation aging and accident DBA radiation aging in the containment vessel of the third generation nuclear power station.
Description
Technical Field
The invention relates to the field of nuclear power, in particular to a manufacturing method of a control cable used in a third-generation nuclear power station containment vessel.
Background
The energy released by fusion of light nuclei and fission of heavy nuclei is called nuclear fusion energy and nuclear fission energy, respectively, and is referred to as nuclear energy or nuclear power for short. A nuclear power plant refers to a facility that converts nuclear energy into electrical energy by appropriate means. Nuclear power plants replace the boilers of thermal power plants with nuclear reactors, and generate heat by the special form of "burning" of nuclear fuel in the nuclear reactors, so that the nuclear energy is converted into heat energy to heat water and generate steam.
With the gradual development of nuclear power technology, in order to eliminate the negative effects of the occurred nuclear power station accidents, the nuclear power industry in the world concentrates the strength to research and attack the prevention and alleviation of the serious accidents, and the united states and europe have issued advanced light water reactor user requirement documents (URD documents) and european users' requirements for light water reactor nuclear power stations (EUR documents), so as to further clarify the requirements of preventing and alleviating the serious accidents and improving the safety and reliability. Thus, a nuclear power plant satisfying the URD files or EUR history is generally called a third generation nuclear power plant internationally.
The safety and the economical efficiency of the third-generation nuclear power station are obviously superior to those of the second-generation nuclear power station, typical representatives of the third-generation nuclear power station are AP1000 developed by American West-House company and EPR1000 advanced pressurized water reactor developed by French EDF company, China independently develops the third-generation nuclear power station technologies such as Hualongyi, CAP1400 and the like which have independent intellectual property rights after absorbing and digesting the nuclear power station technologies, and the technical level of the nuclear power industry of China is greatly promoted. However, the third generation nuclear power station also provides new requirements for the used cable, and the existing preparation process of the nuclear safety grade cable used by the second generation or second generation semi-nuclear power station can not meet the requirements of third generation nuclear power in design service life, radiation resistance, flame retardance and safety function requirements after design of a benchmark accident DBA and a serious accident SA.
Disclosure of Invention
The invention provides a manufacturing method of a control cable used in a containment vessel of a third-generation nuclear power station, which aims to overcome the defect that the performance of the existing cable can not meet the requirements of the third-generation nuclear power station in the prior art, and has the design service life, radiation resistance, flame retardance and safety performance which can meet the requirements of the cable of the third-generation nuclear power station.
The invention provides a manufacturing method of a control cable used in a third-generation nuclear power station containment vessel, which comprises the following steps: s1 selecting materials; s2 wire drawing; s3 annealing and tinning; s4 twisting the conductor; s5 co-extruding and coating the inner insulating layer and the outer insulating layer; s6 irradiation crosslinking; s7 wrapping the insulated wire core; s8 cabling; s9 packing layer extrusion; s10 shielding; s11 extruding the outer sheath layer; s12 irradiation crosslinking; s13 performance test; and S14 packaging and warehousing the finished product.
Specifically, the S1 material selection step specifically refers to that a conductor selects a copper wire blank for electricians, a polyimide film belt needs to select a belt material with high temperature resistance of more than 200 ℃, and an insulating and sheath material needs to select a high polymer material with the thermal life of more than 60 years after long-term heat resistance evaluation;
the S2 wire drawing step is a pressure processing method that the copper wire blank for electrician is plastically deformed under the action of certain tension through a plurality of die holes on the wire drawing equipment, so that the section of the copper wire blank is reduced and the length of the copper wire blank is increased, finally the required specification monofilaments of the product are achieved, and the diameter deviation of each specification monofilament is not more than +/-1.0%.
The step of S3 annealing and tinning specifically comprises the step of annealing and annealing the standard monofilaments formed through the wire drawing process on annealing and tinning equipment and continuously hot tinning, wherein the annealing and annealing temperature is 500-650 ℃, and the linear speed is 50-180 m/min.
And the S4 conductor stranding step is to stranding a plurality of strands of tin-plated copper monofilaments formed through wire drawing and annealing tin plating according to a stranding pitch ratio of 10-16 to form the conductor.
S5 co-extrusion coating step of the inner insulating layer and the outer insulating layer means that the inner insulating layer adopts high-electrical-performance radiation-resistant cross-linked polyethylene or ethylene propylene rubber, the outer insulating layer adopts radiation-resistant halogen-free low-smoke flame-retardant cross-linked polyolefin or ethylene propylene rubber, a double-layer extrusion unit is adopted to simultaneously extrude the inner insulating layer and the outer insulating layer on the conductor wire core by using an extrusion type mould, the total thickness of the extrusion coating is 0.5-1.0mm, the thickness of the inner insulating layer is 0.1-0.3mm but not more than 30% of the total thickness, the processing temperature of the extrusion unit is 80-180 ℃, and the extrusion linear velocity is 8-100 m/min;
the S7 insulating wire core lapping step is to lap a polyimide film tape on the outside of the insulating wire core in a single-layer overlapping mode, wherein the thickness of the film tape is 0.04 mm-0.10 mm, and the lapping overlapping covering rate is 10% -50%.
S8 cabling step is to splice 2-61 wire cores formed by material selection → wire drawing → annealing tinning → conductor stranding → inner insulating layer and outer insulating layer co-extrusion coating → irradiation crosslinking → insulating wire core lapping on cabling equipment into a whole.
And the S9 filling layer extruding step is to adopt an extrusion type mould on an extruding machine set and extrude the halogen-free flame-retardant elastomer material with the oxygen index of 40-50 on the cable core by using a screw rod with the compression ratio of 1.05: 1-1.20: 1.
The S10 shielding step is that the tinned copper wires with the monofilament diameter of 0.15-0.30mm are adopted on a knitting machine, are mutually interwoven and cover the filling layer of the cable product according to a certain rule, and the knitting density is not less than 80%.
The step of extruding and wrapping the outer sheath layer of S11 is to use an extruding or semi-extruding tubular mould on an extruder set, and use a compression ratio of 1.1: 1-1.5: the screw rod of 1 extrudes and wraps the radiation-resistant halogen-free low-smoke flame-retardant cross-linked polyolefin or ethylene propylene sheath material on the filling layer to form an outer sheath, and the processing temperature is 80-180 ℃.
The irradiation crosslinking in the steps S6 and S12 means that irradiation crosslinking is performed on the insulating layer and the sheath layer for 1-2 times respectively on a high-frequency high-voltage electron accelerator irradiation crosslinking production line by adopting 10-20Mrad irradiation total dose.
The S13 performance test step mainly comprises routine tests and identification tests, wherein the routine tests comprise a conductor direct current resistance test, a power frequency withstand voltage test and an insulation resistance test; the identification test mainly comprises an IEC electric type test, an IEC non-electric type test, a 60-year life simulation thermal aging test, a normal working condition irradiation aging test, an accident (DBA) irradiation aging test, a DBA and SA simulation test (LOCA test), a sheath integrity test (immersion test) and a cable combustion characteristic test.
S14 packaging and warehousing the finished product refers to winding the cable product on a special wire and cable reel with the diameter of 630-2000 mm according to a certain direction, and covering the surface of the cable with packaging materials such as foam paper, polyethylene film and the like to achieve the purpose of mechanically protecting the cable product.
The invention has the beneficial effects that:
1. the insulating and sheath material is a high polymer material with the thermal life longer than 60 years after long-term heat resistance evaluation, so that the manufactured cable has the service life longer than 60 years when the conductor is at the long-term working temperature of 90 ℃, and can resist the radiation aging under normal working conditions and accident DBA in the containment vessel of the third-generation nuclear power station.
2. The insulating layer is coated by an inner insulating layer and an outer insulating layer in a co-extrusion mode, the inner insulating layer is made of high-electrical-performance radiation-resistant crosslinked polyethylene or ethylene propylene, the outer insulating layer is made of radiation-resistant halogen-free low-smoke flame-retardant crosslinked polyolefin or ethylene propylene, and the inner insulating layer and the outer insulating layer are simultaneously extruded and coated on the conductor wire core by a double-layer extrusion unit through an extrusion type mold to form double-layer composite insulation. The cable insulation core prepared by adopting the insulation layer extrusion mode has high electrical insulation and flame retardance.
3. According to the invention, the polyimide film tape which can resist the high temperature of more than 200 ℃ is lapped and wrapped outside the original double-layer insulation to form a unique double-layer insulation system, so that the insulating layer which can resist the high temperature of 90 ℃ for a long time can pass the high-temperature and high-pressure simulation test of the design benchmark accident DBA and the serious accident SA, and the cable can be absolutely ensured to still execute the electrical function under the working condition of the serious accident.
4. The invention adopts 80-180 ℃ as the processing temperature, and the extrusion thickness of the inner insulating layer is less than 30% of the total thickness, thereby ensuring the excellent electrical performance. The cable prepared by the production process can meet the performance requirements of the cable product.
5. The invention adopts a filling layer extruding structure, adopts an extruding type mould on an extruding machine set, and adopts a method that the compression ratio is 1.05: 1-1.20: the screw of 1 extrudes the halogen-free flame-retardant elastomer material with the oxygen index of 40-50 into a cable core. By adopting the mode, the cable structure is more compact, the outer diameter is round, the oxygen isolation effect is achieved, the flame spread inhibition capability of the cable is greatly improved, and the flame retardant class A level of the bundled cable can be achieved.
6. The cable produced for the first time can be safely used for 60 years under normal working conditions in the containment vessel of the third-generation nuclear power station by adopting a performance inspection test, particularly a harsh identification test, and can still complete the specified functions under the working conditions of serious accidents.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, the present invention will be further described in detail with reference to the following embodiments.
The invention discloses a manufacturing method of a control cable used in a third generation nuclear power station containment vessel, which comprises the following steps: s1 selecting materials; s2 wire drawing; s3 annealing and tinning; s4 twisting the conductor; s5 co-extruding and coating the inner insulating layer and the outer insulating layer; s6 irradiation crosslinking; s7 wrapping the insulated wire core; s8 cabling; s9 packing layer extrusion; s10 shielding; s11 extruding the outer sheath layer; s12 irradiation crosslinking; s13 performance test; and S14 packaging and warehousing the finished product.
Specifically, the S1 material selection step specifically refers to that a conductor selects a copper wire blank for electricians, a polyimide film belt needs to select a belt material with high temperature resistance of more than 200 ℃, and an insulating and sheath material needs to select a high polymer material with the thermal life of more than 60 years after long-term heat resistance evaluation;
the S2 wire drawing step is a pressure processing method that the copper wire blank for electrician is plastically deformed under the action of certain tension through a plurality of die holes on the wire drawing equipment, so that the section of the copper wire blank is reduced and the length of the copper wire blank is increased, finally the required specification monofilaments of the product are achieved, and the diameter deviation of each specification monofilament is not more than +/-1.0%.
The step of S3 annealing and tinning specifically comprises the step of annealing and annealing the standard monofilaments formed through the wire drawing process on annealing and tinning equipment and continuously hot tinning, wherein the annealing and annealing temperature is 500-650 ℃, and the linear speed is 50-180 m/min.
And the S4 conductor stranding step is to stranding a plurality of strands of tin-plated copper monofilaments formed through wire drawing and annealing tin plating according to a stranding pitch ratio of 10-16 to form the conductor.
S5 co-extrusion coating step of the inner insulation and the outer insulation means that the inner insulation adopts high-electrical-performance radiation-resistant cross-linked polyethylene or ethylene propylene rubber, the outer insulation adopts radiation-resistant halogen-free low-smoke flame-retardant cross-linked polyolefin or ethylene propylene rubber, a double-layer extrusion unit is adopted to simultaneously extrude the inner insulation layer and the outer insulation layer on the conductor wire core by using an extrusion type mould, the total thickness of the extruded coating is 0.5-1.0mm, the thickness of the inner insulation layer is 0.1-0.3mm but not more than 30% of the total thickness, the processing temperature of the extrusion unit is 80-180 ℃, and the extrusion linear velocity is 8-100 m/min;
the S7 insulating wire core lapping step is to lap a polyimide film tape on the outside of the insulating wire core in a single-layer overlapping mode, wherein the thickness of the film tape is 0.04 mm-0.10 mm, and the lapping overlapping covering rate is 10% -50%.
S8 cabling step is to splice 2-61 wire cores formed by material selection → wire drawing → annealing tinning → conductor stranding → inner insulating layer and outer insulating layer co-extrusion coating → irradiation crosslinking → insulating wire core lapping on cabling equipment into a whole.
And the S9 filling layer extruding step is to adopt an extrusion type mould on an extruding machine set and extrude the halogen-free flame-retardant elastomer material with the oxygen index of 40-50 on the cable core by using a screw rod with the compression ratio of 1.05: 1-1.20: 1.
The S10 shielding step is that the tinned copper wires with the monofilament diameter of 0.15-0.30mm are adopted on a knitting machine, are mutually interwoven and cover the filling layer of the cable product according to a certain rule, and the knitting density is not less than 80%.
The step of extruding and wrapping the outer sheath layer of S11 is to use an extruding or semi-extruding tubular mould on an extruder set, and use a compression ratio of 1.1: 1-1.5: the screw rod of 1 extrudes and wraps the radiation-resistant halogen-free low-smoke flame-retardant cross-linked polyolefin or ethylene propylene sheath material on the filling layer to form an outer sheath, and the processing temperature is 80-180 ℃.
The irradiation crosslinking in the steps S6 and S12 means that irradiation crosslinking is performed on the insulating layer and the sheath layer for 1-2 times respectively on a high-frequency high-voltage electron accelerator irradiation crosslinking production line by adopting 10-20Mrad irradiation total dose.
The S13 performance test step mainly comprises routine tests and identification tests, wherein the routine tests comprise a conductor direct current resistance test, a power frequency withstand voltage test and an insulation resistance test; the identification test mainly comprises an IEC electric type test, an IEC non-electric type test, a 60-year life simulation thermal aging test, a normal working condition irradiation aging test, an accident (DBA) irradiation aging test, a DBA and SA simulation test (LOCA test), a sheath integrity test (immersion test) and a cable combustion characteristic test.
S14 packaging and warehousing the finished product refers to winding the cable product on a special wire and cable reel with the diameter of 630-2000 mm according to a certain direction, and covering the surface of the cable with packaging materials such as foam paper, polyethylene film and the like to achieve the purpose of mechanically protecting the cable product.
Embodiment 1 manufacturing method of control cable used in third-generation nuclear power station containment vessel
The method comprises the following steps of S1 material selection, wherein a conductor is selected from an electrical copper wire blank, a polyimide film belt is selected from a belt material with high temperature resistance of more than 200 ℃, an insulation and sheath material is selected from a high polymer material with long-term heat resistance evaluation, the heat life of the insulation and sheath material is more than 60 years, the inner insulation is made of radiation-resistant cross-linked polyethylene with high electrical property, the outer insulation is made of radiation-resistant halogen-free low-smoke flame-retardant cross-linked polyolefin, and the sheath is made of radiation-resistant halogen-free low-.
S2 wire drawing step is a pressure processing method that the copper wire billet for electrician is plastically deformed under the action of certain tension through a plurality of die holes on the wire drawing equipment to reduce the section and increase the length, the diameter of the monofilament reaching the specification is 0.30-0.85mm, and the direct deviation is not more than +/-0.002 mm.
The S3 annealing and tinning step specifically comprises the step of annealing and annealing the 0.30-0.85 mm-sized monofilament formed through the wire drawing process on an annealing and tinning device and continuously carrying out hot tinning, wherein the annealing and annealing temperature is 580-650 ℃, and the linear velocity is 50-100 m/min.
And in the S4 conductor stranding step, a plurality of strands of tin-plated copper monofilaments formed after wire drawing and annealing tin plating are stranded into a conductor according to a stranding pitch-diameter ratio of 10-16.
S5 co-extrusion coating of the inner insulation and the outer insulation comprises the steps that the inner insulation adopts high-electrical-performance radiation-resistant cross-linked polyethylene, the outer insulation adopts radiation-resistant halogen-free low-smoke flame-retardant cross-linked polyolefin, a double-layer extrusion unit is adopted to simultaneously extrude the inner insulation layer and the outer insulation layer on a conductor wire core by using an extrusion type mould, the total extrusion thickness is 0.5-1.0mm, the thickness of the inner insulation layer is 0.1-0.3mm but not more than 30% of the total thickness, the processing temperature of the extrusion unit is 100-180 ℃, and the extrusion linear speed is 100 m/min; the extrusion of the insulating layer is carried out on a plastic machine, and the equipment generally has 5-10 temperature zone control points, and each temperature point is a gradual rising process and is not a single temperature. If the device has 7-zone temperature control points: the temperature of the machine body 1 region is 100 ℃, the temperature of the machine body 2 region is 150 ℃, the temperature of the machine body 3 region is 165 ℃, the temperature of the machine body 4 region is 180 ℃, the temperature of the machine neck region is 175 ℃, the temperature of the machine head region is 180 ℃, the temperature of the die orifice region is 180 ℃, and the temperature of each region can be controlled to be +/-10 ℃.
S6, performing irradiation crosslinking on the insulating layer prepared in the step S5 for 1-2 times by adopting 10-20Mrad irradiation total dose on a high-frequency high-voltage electron accelerator irradiation crosslinking production line.
S7 the step of lapping the insulated wire core is to lap a polyimide film tape on the outer side of the insulated wire core in a single-layer overlapping mode, wherein the thickness of the film tape is 0.04mm, and the lapping overlapping rate is 10%.
S8 cabling step is to splice 2-61 wire cores formed by material selection → wire drawing → annealing tinning → conductor stranding → inner insulating layer and outer insulating layer coextrusion coating → irradiation crosslinking → insulating wire core lapping on cabling equipment into a whole.
And in the step of extruding and coating the filling layer S9, an extrusion die is adopted on an extruder set, and the halogen-free flame-retardant elastomer material with the oxygen index of 40 is extruded and coated on the cable core by a screw with the compression ratio of 1.20: 1.
The shielding step of S10 is to adopt 0.15-0.30mm monofilament diameter tinned copper wires on a knitting machine, interweave the tinned copper wires with each other according to a certain rule and cover the tinned copper wires on a filling layer of a cable product, wherein the knitting density is equal to 80-85%.
S11 the step of extruding the outer sheath layer is to use an extruding or semi-extruding pipe type mould on an extruding machine set, and to use a compression ratio of 1.1: the screw rod of 1 extrudes and wraps the radiation-resistant halogen-free low-smoke flame-retardant cross-linked polyolefin on the filling layer to form an outer sheath, and the processing temperature is 100-180 ℃. The extrusion of the outer sheath layer is carried out on a plastic machine, the equipment generally has 5-10 temperature zone control points, and each temperature point is a gradual rising process and is not a single temperature. If the device has 7-zone temperature control points: the temperature of the machine body 1 region is 100 ℃, the temperature of the machine body 2 region is 150 ℃, the temperature of the machine body 3 region is 165 ℃, the temperature of the machine body 4 region is 180 ℃, the temperature of the machine neck region is 175 ℃, the temperature of the machine head region is 180 ℃, the temperature of the die orifice region is 180 ℃, and the temperature of each region can be controlled to be +/-10 ℃.
S12 performing irradiation crosslinking for 1-2 times on the outer sheath layer prepared in the S11 step by adopting 10-20Mrad irradiation total dose on a high-frequency high-voltage electron accelerator irradiation crosslinking production line.
The S13 performance test step mainly comprises routine tests and identification tests, wherein the routine tests comprise a conductor direct current resistance test, a power frequency withstand voltage test and an insulation resistance test; the identification test mainly comprises an IEC electric type test, an IEC non-electric type test, a 60-year life simulation thermal aging test, a normal working condition irradiation aging test, an accident (DBA) irradiation aging test, a DBA and SA simulation test (LOCA test), a sheath integrity test (immersion test) and a cable combustion characteristic test.
S14 packaging and warehousing of finished products refers to winding the cable products on a special wire and cable reel with the diameter of 630-1600mm in a certain direction, and covering the surfaces of the cables with packaging materials such as foam paper, polyethylene films and the like to achieve the purpose of mechanically protecting the cable products.
Embodiment 2 manufacturing method of control cable used in third-generation nuclear power station containment vessel
The method comprises the following steps of S1 material selection, specifically, selecting a copper wire blank for electrical engineering as a conductor, selecting a strip material with high temperature resistance of more than 200 ℃ as a polyimide film strip, selecting a high polymer material with long-term heat resistance evaluation on the thermal life of the insulation and sheath materials, wherein the inner insulation adopts high-electrical-property radiation-resistant crosslinked ethylene propylene, the outer insulation adopts radiation-resistant halogen-free low-smoke flame-retardant crosslinked ethylene propylene, and the sheath adopts radiation-resistant halogen-free low-smoke flame-retardant crosslinked ethylene propylene.
S2 wire drawing step is a pressure processing method that the copper wire billet for electrician is plastically deformed under the action of certain tension through a plurality of die holes on the wire drawing equipment to reduce the section and increase the length, the diameter of the monofilament reaching the specification is 0.30-0.85mm, and the direct deviation is not more than +/-0.09 mm.
The step of S3 annealing and tinning specifically comprises the step of annealing and annealing the standard monofilaments formed through the wire drawing process on annealing and tinning equipment and continuously hot tinning, wherein the annealing and annealing temperature is 580-650 ℃, and the linear speed is 50-100 m/min.
And in the S4 conductor stranding step, a plurality of strands of tin-plated copper monofilaments formed after wire drawing and annealing tin plating are stranded into a conductor according to a stranding pitch ratio of 10-16.
S5 co-extrusion coating step of the inner insulation and the outer insulation means that the inner insulation adopts high-electrical-performance radiation-resistant crosslinked ethylene propylene rubber, the outer insulation adopts radiation-resistant halogen-free low-smoke flame-retardant crosslinked ethylene propylene rubber, a double-layer extrusion unit is adopted to simultaneously extrude the inner insulation layer and the outer insulation layer on the conductor wire core by using an extrusion type mould, the total extrusion thickness is 0.5-1.0mm, the thickness of the inner insulation layer is 0.1-0.3mm but not more than 30% of the total thickness, the processing temperature of the extrusion unit is 80-160 ℃, and the extrusion linear velocity is 8 m/min;
s6, performing irradiation crosslinking on the insulating layer prepared in the step S5 for 1-2 times by adopting 10-20Mrad irradiation total dose on a high-frequency high-voltage electron accelerator irradiation crosslinking production line.
S7 the step of lapping the insulated wire core means that a polyimide film tape is lapped outside the insulated wire core in a single-layer overlapping mode, the thickness of the film tape is 0.04-0.10mm, and the lapping overlapping covering rate is 50%.
S8 cabling step is to splice 2-61 wire cores formed by material selection → wire drawing → annealing tinning → conductor stranding → inner insulating layer and outer insulating layer coextrusion coating → irradiation crosslinking → insulating wire core lapping on cabling equipment into a whole.
The step of extruding and wrapping the filling layer of S9 is to adopt an extrusion type mould on an extruder set and extrude and wrap the halogen-free flame-retardant elastomer material with the oxygen index of 50 on the cable core by a screw rod with the compression ratio of 1.20: 1.
The shielding step of S10 is to adopt 0.15-0.30mm monofilament diameter tinned copper wires on a knitting machine, interweave the tinned copper wires with each other according to a certain rule and cover the tinned copper wires on a filling layer of a cable product, wherein the knitting density is equal to 80-85%.
S11 the step of extruding the outer sheath layer is to use an extruding or semi-extruding pipe type mould on an extruding machine set, and to use a compression ratio of 1.20: the screw rod of 1 extrudes and wraps the radiation-resistant halogen-free low-smoke flame-retardant crosslinked ethylene propylene sheath material on the filling layer to form an outer sheath, and the processing temperature is 80-160 ℃.
S12 irradiation crosslinking is carried out on the outer sheath layer for 2 times respectively on the irradiation crosslinking production line of the high-frequency high-voltage electron accelerator by adopting the total irradiation dose of 10-20 Mrad.
The S13 performance test step mainly comprises routine tests and identification tests, wherein the routine tests comprise a conductor direct current resistance test, a power frequency withstand voltage test and an insulation resistance test; the identification test mainly comprises an IEC electric type test, an IEC non-electric type test, a 60-year life simulation thermal aging test, a normal working condition irradiation aging test, an accident (DBA) irradiation aging test, a DBA and SA simulation test (LOCA test), a sheath integrity test (immersion test) and a cable combustion characteristic test.
S14 packaging and warehousing of finished products refers to winding the cable products on a special wire and cable reel with the diameter of 630-1600mm in a certain direction, and covering the surfaces of the cables with packaging materials such as foam paper, polyethylene films and the like to achieve the purpose of mechanically protecting the cable products.
Embodiment 3 Performance detection experiment of control cable used in third-generation nuclear power station containment
Six experimental groups were set, wherein experimental groups 1-3 used the preparation method of example 1, and experimental groups 4-6 used the preparation method of example 2, and the specific preparation process parameters were controlled as shown in Table 1
TABLE 1 concrete preparation process parameter control table
Then the control cables used in the containment of the six groups of experimental groups are detected to obtain the final performance detection parameters table 2
Test parameters Table 2
As can be seen from table 2, the test group No. 6 has the best performance, and is superior to other test group cables in terms of design service life, radiation resistance, flame retardancy, and safety performance.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.
Claims (9)
1. A manufacturing method of a control cable used in a containment vessel of a third-generation nuclear power station is characterized by comprising the following steps: the method comprises the following steps: s1 selecting materials; s2 wire drawing; s3 annealing and tinning; s4 twisting the conductor; s5 co-extruding and coating the inner insulating layer and the outer insulating layer; s6 irradiation crosslinking; s7 wrapping the insulated wire core; s8 cabling; s9 packing layer extrusion; s10 shielding; s11 extruding the outer sheath layer; s12 irradiation crosslinking; s13 performance test; and S14 packaging and warehousing the finished product.
2. The method for manufacturing the control cable for the third generation nuclear power station in-containment vessel according to claim 1, wherein: and in the step S5, the inner insulating layer co-extruded and coated by the inner insulating layer and the outer insulating layer adopts high-electrical-property radiation-resistant cross-linked polyethylene or ethylene propylene rubber, and the outer insulating layer adopts radiation-resistant halogen-free low-smoke flame-retardant cross-linked polyolefin or ethylene propylene rubber.
3. The method for manufacturing the control cable for the third generation nuclear power station containment vessel according to claim 2, wherein: and in the step S5, the co-extrusion coating of the inner insulating layer and the outer insulating layer is realized by simultaneously extruding the inner insulating layer and the outer insulating layer on the conductor wire core by adopting a double-layer extruder set and an extrusion type mould.
4. The method for manufacturing the control cable for the third generation nuclear power station in-containment vessel according to claim 3, wherein: in the step S5, the total thickness of the extruded bag in the co-extrusion coating of the inner insulating layer and the outer insulating layer is 0.5 mm-1.0 mm, the thickness of the inner insulating layer is 0.1 mm-0.3 mm but not more than 30% of the total thickness, the processing temperature of an extruding unit is 80-180 ℃, and the extrusion linear speed is 8 m/min-100 m/min.
5. The method for manufacturing the control cable for the third generation nuclear power station in-containment vessel according to claim 1, wherein: the lapping of the insulated wire core in the step S7 means that a single-layer overlapping lapping polyimide film belt is lapped outside the insulated wire core.
6. The method for manufacturing the control cable for the third generation nuclear power station in-containment vessel according to claim 1, wherein: the step S9 of filling layer extrusion coating refers to that an extrusion type mold is adopted on an extrusion unit, and a screw rod with the compression ratio of 1.05: 1-1.20: 1 is used for extruding and coating the halogen-free flame-retardant elastomer material with the oxygen index of 40-50 on the cable core.
7. The method for manufacturing the control cable for the third generation nuclear power station in-containment vessel according to claim 1, wherein: the conductor stranding in the step S4 refers to stranding a plurality of strands of tin-plated copper monofilaments formed through wire drawing and annealing tin plating processes into a conductor according to a stranding pitch ratio of 10-16.
8. The method for manufacturing the control cable for the third generation nuclear power station in-containment vessel according to claim 1, wherein: the step S11 of extruding the outer sheath layer is to use an extruding or semi-extruding tubular mold on an extruder set, and to use a compression ratio of 1.1: 1-1.5: the screw rod of 1 extrudes and wraps the radiation-resistant halogen-free low-smoke flame-retardant cross-linked polyolefin or ethylene propylene sheath material on the filling layer to form the outer sheath.
9. The method for manufacturing the control cable for the third generation nuclear power station in-containment vessel according to claim 1, wherein: the irradiation crosslinking in the step S6 and the step S12 is performed on the insulating layer and the sheath layer by irradiation for 1-2 times with a total irradiation dose of 10-20Mrad on the irradiation crosslinking production line of the high-frequency high-voltage electron accelerator.
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| CN113450970A (en) * | 2021-03-22 | 2021-09-28 | 深圳市明谋科技有限公司 | Production method of multilayer wire and cable |
| CN116206796A (en) * | 2022-09-09 | 2023-06-02 | 复旦大学 | High-performance 80-year-life low-resistance low-voltage power transmission cable for third-generation nuclear power station and preparation method |
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