CN217880882U - Radiation-resistant flexible antimagnetic cable with temperature of more than 300 ℃ for hydrogen igniter of nuclear power station - Google Patents
Radiation-resistant flexible antimagnetic cable with temperature of more than 300 ℃ for hydrogen igniter of nuclear power station Download PDFInfo
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- CN217880882U CN217880882U CN202220863882.4U CN202220863882U CN217880882U CN 217880882 U CN217880882 U CN 217880882U CN 202220863882 U CN202220863882 U CN 202220863882U CN 217880882 U CN217880882 U CN 217880882U
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Abstract
A radiation-resistant flexible antimagnetic cable with the temperature of more than 300 ℃ for a hydrogen igniter of a nuclear power station is a cable core formed by stranding a plurality of wire cores; the cable core is wrapped with a heat insulation buffer layer; a copper strip sheath is coated outside the heat insulation buffer layer; the wire core is a conductor formed by combining and stranding one or more nickel-plated alloy single wire bundles; wrapping the conductor with a core insulating layer and then wrapping a silicon rubber insulating layer; the core insulating layer has the structure that: sequentially overlapping and wrapping a plurality of layers of fluorine-free high-temperature-resistant calcined mica tapes outside the conductor; the lapping and covering rate of the overlapped lapping is 48 to 52 percent; the silicon rubber insulating layer is formed by extruding flexible high-temperature-resistant silicon rubber insulating materials; the cabling pitch diameter ratio of the cable core formed by stranding the wire cores is 45-55 times; the heat insulation buffer layer is formed by extruding high-temperature-resistant silicon rubber; the copper strip sheath is formed by tightly wrapping an antimagnetic and antioxidant copper strip outside the heat-insulating buffer layer and then welding and embossing. The cable can be matched with equipment in a high-temperature area in certain containment vessels of a third-generation nuclear power station and a fourth-generation nuclear power station for use.
Description
Technical Field
The technical scheme belongs to the technical field of special cables of nuclear power stations, and particularly relates to a radiation-resistant flexible antimagnetic cable used for a hydrogen igniter of a nuclear power station and having the temperature of more than 300 ℃.
Background
Nuclear power is a clean, low-carbon, high-energy-density energy source, and since the second half of the 20 th century, nuclear fission power generation has been widely used globally. The gas-cooled micro-reactor electrical system and equipment used by a certain nuclear power station need to adopt cables which can run at the temperature of more than 300 ℃ for a long time. Meanwhile, due to special requirements such as safety of the cable used in the nuclear power plant, the cable also needs to have radiation resistance.
The special cable with the service life of 1 year at 350 ℃ used by a certain type of nuclear power plant hydrogen igniter is a high-temperature resistant cable with the highest performance requirement and is recognized in the industry. At present, only one specification cable can meet the use requirement, but the cable not only has small current-carrying capacity, but also depends on import for a long time.
Disclosure of Invention
In order to solve the problems in the prior art, the technical scheme provides a radiation-resistant flexible antimagnetic cable with the temperature of more than 300 ℃ for a hydrogen igniter of a nuclear power station, wherein a cable core is formed by stranding a plurality of wire cores; the cable core is wrapped with a heat insulation buffer layer 4; a copper strip sheath 5 is coated outside the heat insulation buffer layer;
the wire core is a conductor 1 formed by combining and stranding one or more nickel-plated alloy single wire bundles; after the conductor is wrapped by the core insulating layer 2, the conductor is wrapped by the silicon rubber insulating layer 3;
the core insulating layer has the structure that: and sequentially overlapping and lapping a plurality of layers of fluorine-free high-temperature-resistant calcined mica tapes outside the conductor, wherein the lapping and covering rate of the overlapping lapping is 48-52%.
One structure is that three layers of fluorine-free high-temperature resistant calcined mica tapes are sequentially lapped and wrapped outside a conductor, wherein the mica surface of the fluorine-free high-temperature resistant calcined mica tape at the inner layer is tightly attached to the conductor; the mica surfaces of the fluorine-free high-temperature-resistant calcined mica tapes on the secondary outer layer and the outermost layer are tightly attached;
the other structure is that five layers of fluorine-free high-temperature-resistant calcined mica are sequentially lapped and wrapped outside the conductor, wherein the mica surface of the first layer of fluorine-free high-temperature-resistant calcined mica tape from inside to outside is closely attached to the alloy conductor, the mica surface of the second layer of fluorine-free high-temperature-resistant calcined mica tape is closely attached to the mica surface of the third layer of fluorine-free high-temperature-resistant calcined mica tape, and the mica surface of the fourth layer of fluorine-free high-temperature-resistant calcined mica tape is closely attached to the mica surface of the fifth layer of fluorine-free high-temperature-resistant calcined mica tape.
The silicon rubber insulating layer is formed by extruding flexible high-temperature-resistant silicon rubber insulating materials; the insulation material can be a Liyang sky insulation material Limited TS series silicon rubber material;
the cabling pitch diameter ratio of the cable core formed by stranding the cable cores is 45-55 times, so that the flexibility degree of the cable is improved.
The heat insulation buffer layer 4 is formed by extruding high-temperature-resistant silicon rubber; the high temperature resistant silicon rubber can be NE series silicon rubber material of Dongjue organosilicon (Nanjing) Co;
the copper strip sheath 5 is formed by tightly wrapping an antimagnetic antioxidant copper strip outside the heat-insulating buffer layer and then welding and embossing.
The nominal thickness of the fluorine-free high-temperature resistant calcined mica tape is 0.12mm or 0.14mm, and the width is 15 mm-35 mm.
Further: the nominal sectional area of the conductor is 1.0-95 mm 2 The wire diameter of the nickel-plated alloy monofilament ranges from 0.37 mm to 2.62mm.
The plurality of nickel plating alloy monofilaments are bundled and twisted, the twisting direction of the nickel plating alloy monofilaments is the left direction, and the bundle pitch of the nickel plating alloy monofilaments is not more than 16 times of the outer diameter of the bundled nickel plating alloy monofilaments;
the nickel-plated alloy monofilaments are arranged and stranded in a layered manner from inside to outside; adjacent nickel plating alloy monofilaments in each layer of nickel plating alloy monofilaments are tightly attached to each other; the inner and outer layers of the two adjacent layers of the nickel-plated alloy monofilaments are tightly attached.
The nominal thickness of the silicone rubber insulating layer is 1.0-2.0 mm.
The thickness of the heat insulation buffer layer is 0.5-4.0 mm.
The thickness of the antimagnetic and antioxidant copper strip is 0.2-0.7 mm.
The embossing depth of the antimagnetic and antioxidant copper strip is 0.8-2.0 mm, and the embossing interval is 3.0-8.0 mm.
The design principle of the cable is explained as follows:
the insulating layer is made of fluoride-free high-temperature-resistant calcined mica tapes and flexible high-temperature-resistant silicon rubber composite insulation, and has the advantages of nuclear radiation resistance, low smoke, no halogen, no toxicity, high temperature resistance and flexibility.
The cable core is externally extruded with a flexible high-temperature silicon rubber heat insulation buffer layer to improve the high-temperature resistance of the cable in a heat insulation buffer mode. High temperature outside-in conduction is prevented by the physical insulation effect of low heat conduction. And meanwhile, the aging resistance and the radiation resistance of the insulated wire core are enhanced.
The outer sheath adopts an antimagnetic and antioxidant wrinkle copper strip to improve the radiation resistance, high temperature resistance and flexibility of the cable.
The whole cable is made of high-temperature resistant materials, wherein the fluorine-free high-temperature resistant calcined mica tape can be burnt for a long time at the flame temperature of 830 ℃ to keep the electrical performance. The flexible high-temperature-resistant silicone rubber has a long-term use temperature range of-60-350 ℃, high insulating electrical performance and a main function of further ensuring the insulating performance of the fluorine-free high-temperature-resistant calcined mica tape of the whole cable in high-temperature operation. The fluorine-free high-temperature-resistant calcined mica tape and the flexible high-temperature-resistant silicon rubber composite insulation are adopted, so that the environmental working conditions of high-dose irradiation, extreme high temperature and high pressure resistance of the cable can be improved, a certain insulation resistance can still be kept in a severe environment, and normal transmission of current is ensured.
The mica surface of the inner layer of the fluorine-free high-temperature resistant calcined mica tape is tightly attached to the alloy conductor, and the mica surface of the secondary outer layer of the fluorine-free high-temperature resistant calcined mica tape is tightly attached to the mica surface of the outermost mica tape so as to strengthen the effective insulating layer of the mica tape in a high-temperature or fire environment.
The antimagnetic and antioxidant copper strip should be tightly wrapped outside the cable core after the high-temperature-resistant silicon rubber is extruded, and the welding and embossing of the copper strip should be continuous, tight and uniform. The metal sheath can further prevent severe environments such as high temperature, high pressure, high dose irradiation rays and the like from being transmitted to the insulation, and meanwhile, the deformation resistance of the cable can be improved, and the flexibility of the cable is also obviously improved.
The utility model discloses a structure of specific design can make the cable can use on the equipment of the relevant high temperature region in certain containment of third generation, fourth generation nuclear power station, is applicable to that special check-out equipment uses in the nuclear power station containment such as EPR, AP1000, CAP1400, hualong first number.
Drawings
Figure 1 is a schematic radial cross-section of the cable of this embodiment,
in the figure: the cable comprises a conductor 1, a core insulating layer 2, a silicon rubber insulating layer 3, a heat insulation buffer layer 4 and a copper strip sheath 5.
Detailed Description
The technical solution is further described below with reference to specific examples as follows:
referring to fig. 1, a radiation-resistant flexible antimagnetic cable used for a hydrogen igniter of a nuclear power plant and having a temperature of more than 300 ℃ is a cable core formed by stranding a plurality of wire cores; the cable core is wrapped with a heat insulation buffer layer 4; a copper strip sheath 5 is coated outside the heat insulation buffer layer;
the wire core is a conductor 1 formed by combining and stranding one or more nickel-plated alloy single wire bundles; the conductor is wrapped with the core insulating layer 2 and then wrapped with the silicon rubber insulating layer 3;
in example 1, the structure of the core insulating layer is: sequentially lapping three layers of fluorine-free high-temperature-resistant calcined mica tapes outside the conductor in an overlapping manner, wherein the mica surface of the fluorine-free high-temperature-resistant calcined mica tape on the inner layer is tightly attached to the conductor; the mica surfaces of the fluorine-free high-temperature-resistant calcined mica tapes on the secondary outer layer and the outermost layer are tightly attached; the lapping and covering rate of the overlapped lapping is 48 to 52 percent;
the silicon rubber insulating layer is formed by extruding flexible high-temperature-resistant silicon rubber insulating materials;
the cabling pitch diameter ratio of the cable core formed by stranding the wire cores is 45-55 times, so that the flexibility degree of the cable is improved.
The heat insulation buffer layer 4 is formed by extruding high-temperature-resistant silicon rubber;
the copper strip sheath 5 is formed by tightly wrapping an antimagnetic antioxidant copper strip outside the heat insulation buffer layer and then welding and embossing.
The nominal thickness of the fluorine-free high-temperature resistant calcined mica tape is 0.12mm or 0.14mm, and the width is 15 mm-35 mm.
Further: the nominal sectional area of the conductor is 1.0-95 mm 2 The wire diameter of the nickel-plated alloy monofilament ranges from 0.37 mm to 2.62mm.
The plurality of nickel plating alloy monofilaments are bundled and twisted, the twisting direction of the nickel plating alloy monofilaments is the left direction, and the bundle pitch of the nickel plating alloy monofilaments is not more than 16 times of the outer diameter of the bundled nickel plating alloy monofilaments;
arranging and stranding the nickel-plated alloy monofilaments layer by layer from inside to outside; adjacent nickel plating alloy monofilaments in each layer of nickel plating alloy monofilaments are tightly attached to each other; the inner and outer layers of the two adjacent layers of the nickel-plated alloy monofilaments are tightly attached.
The nominal thickness of the silicone rubber insulating layer is 1.0-2.0 mm.
The thickness of the heat insulation buffer layer is 0.5-4.0 mm.
The thickness of the antimagnetic and antioxidant copper strip is 0.2-0.7 mm.
The embossing depth of the antimagnetic and antioxidant copper strip is 0.8-2.0 mm, and the embossing interval is 3.0-8.0 mm.
The radial sectional area of the conductor is 2.5mm 2 The conductor structure is completed by bundling 2 layers of nickel-plated alloy monofilaments, the nickel-plated alloy monofilaments are arranged in a 1+6 structure, a 0.68mm nickel-plated alloy wire is placed in the center, the outer layer is symmetrically twisted by 6 unequal nickel-plated alloy monofilaments, the direction is in the left direction, the twisting pitch is 40 +/-3 mm, and the bundling pitch is not more than 16 times of the bundled outer diameter.
The nominal thickness of the silicon rubber insulating layer 3 is 1.0mm, and the average thickness of the insulation is not less than the nominal value.
Example 2 is different from example 1 only in that the core insulating layer has a structure in which: five layers of fluorine-free high-temperature resistant calcined mica are sequentially lapped and wrapped outside the conductor, wherein the mica surface of the first layer of fluorine-free high-temperature resistant calcined mica tape from inside to outside is tightly attached to the alloy conductor, the mica surface of the second layer of fluorine-free high-temperature resistant calcined mica tape is tightly attached to the mica surface of the third layer of fluorine-free high-temperature resistant calcined mica tape, and the mica surface of the fourth layer of fluorine-free high-temperature resistant calcined mica tape is tightly attached to the mica surface of the fifth layer of fluorine-free high-temperature resistant calcined mica tape.
The structure of example 1 is superior to the structure of example 2 in terms of the high temperature resistance and bending resistance of the cable.
The cable prepared by the method of example 1 was tested. And (3) displaying a detection result:
1) Good low smoke halogen-free performance
Through the third-party type detection, the finished cable passes through GB/T17650 test method for gas evolution during cable material combustion.
2) Good electrical performance
The finished cable passes through 3.5kV for 5 minutes and 4U respectively by the third-party type detection 0 * AC withstand voltage test for 4 hours.
3) Nuclear radiation resistance
Through third-party type detection, the gamma-ray irradiation resistant dose of the finished cable reaches 2000kGy
4) Thermal ageing resistance and high-temperature resistance
Through the third-party type detection, the finished cable equivalently resists the high-temperature heat aging of 300 ℃ for more than 3 years.
5) Fire resistance
Through the third-party type detection, the finished cable meets the fire resistance test specified in GB/T34926-2017.
Claims (9)
1. A radiation-resistant flexible antimagnetic cable with the temperature of more than 300 ℃ for a hydrogen igniter of a nuclear power station is characterized in that a cable core is formed by stranding a plurality of wire cores; the cable core is wrapped with a heat insulation buffer layer; a copper strip sheath is coated outside the heat insulation buffer layer;
the wire core is a conductor formed by combining and stranding one or more nickel-plated alloy single wire bundles; wrapping the conductor with a core insulating layer and then wrapping the conductor with a silicon rubber insulating layer;
the core insulating layer has the structure that: sequentially overlapping and wrapping a plurality of layers of fluorine-free high-temperature-resistant calcined mica tapes outside the conductor; the lapping and covering rate of the overlapped lapping is 48 to 52 percent;
the silicon rubber insulating layer is formed by extruding flexible high-temperature-resistant silicon rubber insulating material;
the cabling pitch diameter ratio of the cable core formed by stranding the cable cores is 45-55 times;
the heat insulation buffer layer is formed by extruding high-temperature-resistant silicon rubber;
the copper strip sheath is formed by tightly wrapping an antimagnetic antioxidant copper strip outside the heat-insulating buffer layer and then welding and embossing.
2. The radiation-resistant flexible antimagnetic cable used for the hydrogen igniter in the nuclear power station of claim 1 and having the temperature of more than 300 ℃, wherein the core insulating layer has the structure that: sequentially lapping three layers of fluorine-free high-temperature-resistant calcined mica tapes outside the conductor in an overlapping manner, wherein the mica surface of the fluorine-free high-temperature-resistant calcined mica tape on the inner layer is tightly attached to the conductor; the mica surfaces of the non-fluorine high-temperature resistant calcined mica tapes of the secondary outer layer and the outermost layer are tightly attached.
3. The radiation-resistant flexible antimagnetic cable used for the hydrogen igniter of the nuclear power station as claimed in claim 1 and having a temperature of more than 300 ℃, wherein the core insulating layer has a structure comprising: and five layers of fluorine-free high-temperature-resistant calcined mica are sequentially lapped and wrapped outside the conductor, wherein the mica surface of the first layer of fluorine-free high-temperature-resistant calcined mica tape from inside to outside is tightly attached to the alloy conductor, the mica surface of the second layer of fluorine-free high-temperature-resistant calcined mica tape is tightly attached to the mica surface of the third layer of fluorine-free high-temperature-resistant calcined mica tape, and the mica surface of the fourth layer of fluorine-free high-temperature-resistant calcined mica tape is tightly attached to the mica surface of the fifth layer of fluorine-free high-temperature-resistant calcined mica tape.
4. The radiation-resistant flexible antimagnetic cable used for the hydrogen igniter of the nuclear power station at the temperature of more than 300 ℃ as claimed in claim 1, wherein the nominal cross-sectional area of the conductor is 1.0-95 mm 2 The wire diameter of the nickel-plated alloy monofilament ranges from 0.37 mm to 2.62mm.
5. The radiation-resistant flexible antimagnetic cable used for the hydrogen igniter in the nuclear power plant according to claim 1 and having the temperature of more than 300 ℃, wherein a plurality of nickel-plated alloy monofilaments are bundled and twisted, the twisting direction of the nickel-plated alloy monofilaments is the left direction, and the bundling pitch of the nickel-plated alloy monofilaments is not more than 16 times of the outer diameter after bundling;
arranging and stranding the nickel-plated alloy monofilaments layer by layer from inside to outside; adjacent nickel plating alloy monofilaments in each layer of nickel plating alloy monofilaments are tightly attached to each other; the inner layer nickel-plated alloy monofilament and the outer layer nickel-plated alloy monofilament of the two adjacent layers are tightly attached.
6. The radiation-resistant flexible antimagnetic cable for the hydrogen igniter of the nuclear power plant at the temperature of more than 300 ℃ as claimed in claim 1, wherein the nominal thickness of the silicon rubber insulating layer is 1.0-2.0 mm.
7. The radiation-resistant flexible antimagnetic cable for the hydrogen igniter of the nuclear power plant at the temperature of more than 300 ℃ as claimed in claim 1, wherein the thickness of the heat-insulating buffer layer is 0.5 to 4.0mm.
8. The radiation-resistant flexible antimagnetic cable used for the hydrogen igniter of the nuclear power station as claimed in claim 1, wherein the thickness of the antimagnetic and antioxidant copper strip is 0.2-0.7 mm.
9. The radiation-resistant flexible antimagnetic cable used for the hydrogen igniter in the nuclear power station as claimed in claim 1 and having a temperature of more than 300 ℃, wherein the embossing depth of the antimagnetic and antioxidant copper strip is 0.8-2.0 mm, and the embossing pitch is 3.0-8.0 mm.
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| CN202220863882.4U CN217880882U (en) | 2022-04-15 | 2022-04-15 | Radiation-resistant flexible antimagnetic cable with temperature of more than 300 ℃ for hydrogen igniter of nuclear power station |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116487119A (en) * | 2023-04-08 | 2023-07-25 | 山东中船线缆股份有限公司 | Safe fire-proof cable for port returning and manufacturing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116487119A (en) * | 2023-04-08 | 2023-07-25 | 山东中船线缆股份有限公司 | Safe fire-proof cable for port returning and manufacturing method thereof |
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