CN214336378U - Long-life low temperature resistant nuclear power station gentle environmental non-1E level instrument cable - Google Patents
Long-life low temperature resistant nuclear power station gentle environmental non-1E level instrument cable Download PDFInfo
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- CN214336378U CN214336378U CN202121885844.0U CN202121885844U CN214336378U CN 214336378 U CN214336378 U CN 214336378U CN 202121885844 U CN202121885844 U CN 202121885844U CN 214336378 U CN214336378 U CN 214336378U
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Abstract
The utility model provides a gentle for environment non-1E level instrument cable of low temperature nuclear power station of long-life, belongs to cable technical field, and its structure is: the wire cores are twisted in pairs to form a pair twisting group; the pair twisting group and the filling rope are twisted to form a cable core; the cable core is sequentially wrapped with an inner wrapping layer, a shielding layer, an inner liner layer, an outer wrapping layer and an outer sheath; the wire core is formed by wrapping an insulating layer outside a conductor; one or more twisted pairs are provided; the inner wrapping layer is formed by wrapping a polyester belt inside and a low-smoke halogen-free high-flame-retardant cloth belt outside; the shielding layer is formed by weaving copper wires; the lining layer is made of a low-smoke halogen-free flame-retardant oxygen-isolating layer sheath material; the outer wrapping layer is formed by wrapping low-smoke halogen-free high-flame-retardant cloth tapes; the outer sheath is made of long-life thermoplastic low-smoke halogen-free flame-retardant polyolefin sheath material. The utility model provides the low temperature resistant ability of cable has been promoted, makes the cable use in the conventional island and the BOP region and the similar environment of the gentle environment of nuclear power station.
Description
Technical Field
The utility model relates to an instrument cable, especially a slow for environment non-1E level instrument cable of low temperature nuclear power station of long-life resistant, the utility model belongs to the technical field of the cable.
Background
Instrument cables used in BOP (peripheral equipment of nuclear power station) and conventional island regions in a nuclear power station in a gentle environment generally need to be degraded and used instead of nuclear cables if the instrument cables have long service life or other severe environment requirements, so that the cost is increased, and the resource waste is also caused.
Although the cable is a nuclear power plant and gentle in environment, the cable also needs to meet the requirements of operation under the condition of nuclear radiation, and the performances of radiation resistance, low temperature resistance, service life, flame retardance and the like of the cable are higher than those of a common cable. How to meet special use requirements under the economic condition is a problem to be solved.
SUMMERY OF THE UTILITY MODEL
The actual requirement condition to the gentle environment cable of nuclear power station, the utility model discloses the instrument cable is focused on in cable structure's improvement, increases the life of cable to can be suitable for the alternative use under the low temperature environment.
Aiming at the laying problem in the low-temperature environment, the low-temperature-resistant cable is low-temperature-resistant, the bending radius is 8 times of the radius of the cable, and the moving laying capacity is enhanced.
In order to ensure that the cable can still work normally under the nuclear radiation of a gentle environment, the insulating layer and the outer sheath are required to have radiation resistance.
In order to prevent the spread of fire, the composition structure of the cable is required to have low-smoke halogen-free flame retardant performance.
To avoid frequent replacement of the cable, the service life of the cable needs to be increased.
In order to avoid resource waste, a simple cable structure and a simple and convenient process need to be designed.
In order to achieve the technical purpose, the utility model adopts the following technical scheme:
a long-life low temperature resistant non-1E-level instrument cable for a nuclear power station and a gentle environment is characterized in that the outer diameter range of the cable is 15-35 mm; the structure of the cable is as follows: the wire cores are twisted in pairs to form a pair twisting group; the pair twisting group and the filling rope are twisted to form a cable core; the cable core is sequentially wrapped with an inner wrapping layer, a shielding layer, an inner liner layer, an outer wrapping layer and an outer sheath;
the wire core is formed by wrapping an insulating layer outside a conductor; the cross-sectional area of the conductor is 0.5-2.5 mm2(ii) a The conductor is formed by stranding tinned copper monofilaments in multiple layers from inside to outside, the diameter range of the tinned copper monofilaments is 0.193-0.243 mm, the stranding pitch-diameter ratio range of the tinned copper monofilaments is 12-20 times, the stranding direction of the tinned copper monofilaments at the outermost layer is in the left direction, and the stranding direction of the tinned copper monofilaments at the adjacent layers is opposite; the insulating layer is made of radiation-resistant low-smoke halogen-free flame-retardant crosslinked polyethylene insulating material;
one or more twisted pairs are arranged, and the twisting pitch is not more than 100 mm;
the single stranded wire group of one pair of stranded wire groups, its direction of twist is the right direction;
the twisting direction of the multi-twisted line group of the plurality of twisted line groups is the left direction; the twisting pitches of adjacent pair twisting groups are different;
the inner wrapping layer is formed by wrapping a polyester belt inside and a low-smoke halogen-free high-flame-retardant cloth belt outside; the wrapping direction of the low-smoke halogen-free high-flame-retardant cloth tape is right, and the wrapping direction of the polyester tape is left; the width is 15-40 mm, and the lapping and covering rate is not less than 20%; the thickness range of the low-smoke halogen-free high-flame-retardant cloth tape is 0.18-0.22 mm, the width of the low-smoke halogen-free high-flame-retardant cloth tape is 15-40 mm, and the lapping and covering rate is not less than 20%.
The shielding layer is formed by weaving copper wires, the diameter range of single wires of the copper wires is 0.12-0.30 mm, and the weaving density is not less than 80%;
the inner liner layer is made of a low-smoke halogen-free flame-retardant oxygen-insulating layer sheath material, the thickness of the inner liner layer is 1.0-1.2 mm, and the thickness of the thinnest part is not less than 80-0.2 mm of a nominal value;
the outer covering layer is formed by wrapping a low-smoke halogen-free high-flame-retardant cloth tape, the wrapping direction is the right direction, the nominal thickness range of the low-smoke halogen-free high-flame-retardant cloth tape is 0.18-0.22 mm, the width is 15-40 mm, and the wrapping covering rate is not less than 20%.
The outer sheath is made of a long-life thermoplastic low-smoke halogen-free flame-retardant polyolefin sheath material, the nominal thickness of the outer sheath is 1.8-2.2 mm, and the thickness of the thinnest part is not less than 80-0.2 mm of the nominal value.
The cable core is formed by twisting 1-12 pairs of twisted groups and a plurality of filling ropes in the right direction together; the filling ropes are respectively filled in the gaps between the center and the side of the cable core; the ratio of the twisted pitch to the diameter is 30-40 times.
The nominal thickness of the insulating layer is 0.6mm, and the thickness of the thinnest point is not less than 90-0.1 mm of the nominal value.
The filling rope is a PP rope formed by polypropylene reticular tearing fibers for filling, and the diameter of a single PP rope is 4.0 mm.
Such as: the cross-sectional area of the conductor is 0.5-2.5 mm2And the outer diameter of the cable is 18.5mm, then:
the diameter of the tin-plated copper monofilament of the conductor is 0.193mm, and the stranding pitch-diameter ratio is 18 times; the thickness of the insulating layer is 0.6 mm; the twisting pitch diameter ratio of the cable core formed by twisting the pair twisting group and the filling rope is 32 times; the thickness of the polyester tape in the inner wrapping layer is 0.04 mm; the thickness of the low-smoke halogen-free high-flame-retardant cloth belt in the inner wrapping layer is 0.20 mm; the monofilament diameter of the copper wire in the shielding layer is 0.20 mm; the thickness of the inner liner layer is 1.0 mm; the thickness of the low-smoke halogen-free high-flame-retardant cloth belt in the outer wrapping layer is 0.20 mm; the thickness of the outer sheath is 1.8 mm.
The gentle environmental non-1E level long-life low temperature resistant instrument cable of this structure is under the basic requirement prerequisite such as satisfying cable electrical property, mechanical properties, adopts the insulating sheath material of resistant radiation and long-life to improve the life and the resistant irradiation performance of cable, uses the PP rope packing that low smoke and zero halogen high flame retardant strap and many polypropylene netted tear fiber constitute to improve the flame retardant property of simple and convenient structure cable, adopts the polyester area to make the structure inseparabler around the package.
After the technical scheme is adopted, the utility model discloses following beneficial effect has:
(1) the cable has reasonable structure.
(2) The stranded tinned copper conductor improves the conductivity of the conductor, makes the conductor more corrosion-resistant, and can reduce the generation of CuO and Cu by copper oxidation2O。
(3) The low-smoke halogen-free flame-retardant filling rope and the sheath material are used, so that the whole cable meets the low-smoke halogen-free flame-retardant performance, and the fire disaster is prevented from spreading due to the cable.
(4) The insulating layer and the outer sheath are made of materials with radiation resistance and long service life, and are matched with the insulating and sheath structures, so that the service life and the radiation resistance of the cable are improved.
(5) The shielding layer is formed by weaving the copper wires, so that the magnetic field is homogenized, and the anti-interference performance of the cable is improved. The capability of bearing short-circuit current of the copper wire braided shield is stronger.
(6) The cable core has increased one deck inside liner structure outward for the overall structure of cable is more inseparable, further isolated and oxygen contact, reinforcing cold resistance.
(7) The bending performance is more excellent by adopting a 5 th conductor and PP rope filling.
The utility model discloses the cable has used high-quality material and specific structural parameter simultaneously on the basis of new design cable shape structure, has prolonged the life of cable, has promoted the low temperature resistant ability of cable, and the cable can be used in the conventional island and the BOP region and the similar environment of the gentle environment of nuclear power station.
Drawings
Fig. 1 is a schematic structural view of the present invention;
in the figure: conductor 1, insulating layer 2, filling rope 3, interior around covering 4, shielding layer 5, inner liner 6, oversheath 7, outer covering 8 of winding.
Detailed Description
The present disclosure is further described with reference to the following drawings and detailed description:
referring to fig. 1, a long-life low-temperature-resistant non-1E-level instrument cable for a nuclear power station and a gentle environment, wherein the outer diameter of the cable ranges from 15 mm to 35 mm; the structure of the cable is as follows: the wire cores are twisted in pairs to form a pair twisting group; the pair twisting group and the filling rope 3 are twisted to form a cable core; the cable core is sequentially wrapped with an inner wrapping layer 4, a shielding layer 5, an inner lining layer 6, an outer wrapping layer 8 and an outer sheath 7;
the wire core is formed by a conductor 1 and an insulating layer 2; the cross-sectional area of the conductor 1 is 0.5-2.5 mm2(ii) a The conductor 1 is formed by stranding tinned copper monofilaments in multiple layers from inside to outside, the diameter range of the tinned copper monofilaments is 0.193-0.243 mm, the stranding pitch-diameter ratio range of the tinned copper monofilaments is 12-20 times, the stranding direction of the tinned copper monofilaments at the outermost layer is the left direction, and the stranding direction of the tinned copper monofilaments at the adjacent layers is opposite; the insulating layer 2 is made of radiation-resistant low-smoke halogen-free flame-retardant crosslinked polyethylene insulating material;
one or more (3 in the example) twisted pairs are arranged, and the twisting pitch is not more than 100 mm;
the single stranded wire group of one pair of stranded wire groups, its direction of twist is the right direction;
the twisting direction of the multi-twisted line group of the plurality of twisted line groups is the left direction; the twisting pitches of adjacent pair twisting groups are different;
the inner wrapping layer 4 is formed by wrapping a polyester belt inside and a low-smoke halogen-free high-flame-retardant cloth belt outside; the wrapping direction of the low-smoke halogen-free high-flame-retardant cloth tape is right, and the wrapping direction of the polyester tape is left; the thickness of the polyester tape is 0.04mm, the width of the polyester tape is 15-40 mm, and the lapping and covering rate is not less than 20%; the thickness range of the low-smoke halogen-free high-flame-retardant cloth tape is 0.18-0.22 mm, the width of the low-smoke halogen-free high-flame-retardant cloth tape is 15-40 mm, and the lapping and covering rate is not less than 20%.
The shielding layer 5 is formed by weaving copper wires, the diameter range of single wires of the copper wires is 0.12-0.30 mm, and the weaving density is not less than 80%;
the inner liner layer 6 is made of a low-smoke halogen-free flame-retardant oxygen-insulating layer sheath material, the thickness of the inner liner layer is 1.0-1.2 mm, and the thickness of the thinnest part is not less than 80-0.2 mm of a nominal value;
the outer wrapping layer 8 is formed by wrapping a low-smoke halogen-free high-flame-retardant cloth tape, the wrapping direction is the right direction, the nominal thickness range of the low-smoke halogen-free high-flame-retardant cloth tape is 0.18-0.22 mm, the width is 15-40 mm, and the wrapping covering rate is not less than 20%.
The outer sheath 7 is made of a long-life thermoplastic low-smoke halogen-free flame-retardant polyolefin sheath material, the nominal thickness of the outer sheath is 1.8-2.2 mm, and the thickness of the thinnest part is not less than 80-0.2 mm of the nominal value.
The cable core is formed by twisting 1-12 pairs of twisted groups and a plurality of filling ropes 3 in the right direction together; the filling ropes 3 are respectively filled in the gaps between the center and the side of the cable core; the ratio of the twisted pitch to the diameter is 30-40 times.
The nominal thickness of the insulating layer 2 is 0.6mm, and the thinnest point thickness is not less than 90-0.1 mm of the nominal value.
The filling rope 3 is a PP rope formed by polypropylene reticular tearing fibers for filling, and the diameter of a single PP rope is 4.0 mm.
In this example: the cross-sectional area of the conductor 1 is 0.5-2.5 mm2And the outer diameter of the cable is 18.5mm, then:
the diameter of the tin-plated copper monofilament of the conductor 1 is 0.193mm, and the stranding pitch-diameter ratio is 18 times;
the thickness of the insulating layer 2 is 0.6 mm;
the twisting pitch diameter ratio of the cable core formed by twisting the pair twisting group and the filling rope 3 is 32 times;
the thickness of the polyester tape in the inner wrapping layer 4 is 0.04 mm; the thickness of the low-smoke halogen-free high-flame-retardant cloth belt in the inner wrapping layer 4 is 0.20 mm;
the monofilament diameter of the copper wire in the shielding layer 5 is 0.20 mm;
the thickness of the inner liner 6 is 1.0 mm;
the thickness of the low-smoke halogen-free high-flame-retardant cloth belt in the outer wrapping layer 8 is 0.20 mm;
the thickness of the outer sheath 7 is 1.8 mm.
In this example, the insulation layer 2 is made of radiation-resistant low-smoke halogen-free flame-retardant crosslinked polyethylene insulation material with the material brand of FPE 162-1. The sheath material of the low-smoke halogen-free flame-retardant oxygen-insulating layer of the inner liner layer 6 has the material brand of HW 495-2. The long-life thermoplastic low-smoke halogen-free flame-retardant polyolefin sheath material of the outer sheath 7 is HW 4690-H.
The single-layer insulating layer is adopted for replacing the double-layer insulating layer of the 1E-level cable, so that the production difficulty is reduced, and the economical efficiency of the cable is improved. Meanwhile, the lining (oxygen isolation) layer and the irradiation-resistant low-smoke halogen-free flame-retardant sheath material are adopted, so that the cable has good cold resistance and bundled flame-retardant performance, and can meet the technical conditions of the BOP cable in a gentle environment.
The cable has the advantages that: the material has the advantages of nuclear radiation resistance, good flame retardant property, long service life, low temperature resistance and good economy.
After the scheme is adopted, the service life of the cable reaches more than 60 years, the cable is good in irradiation resistance, low-temperature resistance and processability, and the production efficiency can be effectively improved. And simultaneously meets the basic requirements of electrical and mechanical properties.
The cable of the present example can be subjected to the following tests, the test results being a pass:
first part Cable Property and Performance verification test
Conductor resistance:
test methods according to GB/T3048.4-2007,
the performance requirement is in accordance with GB/T3956-2008.
Voltage test:
test methods according to GB/T3048.8-2007,
the performance requirement is that the specimen not break down.
4h voltage test:
test methods according to GB/T12706.1-2020,
the performance requirement is that the specimen not break down.
Insulation resistance test at 20 ℃:
test methods according to GB/T3048.5-2007,
the performance requirement is that the insulation resistance constant is more than or equal to 3670 MOmega.
Gas evolution test during combustion:
the test method is carried out according to GB/T17650.2-2021,
the performance requirement is that the HCL content is 5mg/g at most; a minimum pH of 4.3; the conductivity is at most 10. mu.s/mm.
Low temperature performance test:
the test method is according to GB/T2951.14-2008,
the test conditions are that the temperature is minus 35 +/-2 ℃ and the duration time is 4h,
the performance requirements include:
the elongation of the sheath is more than or equal to 20 percent in a low-temperature tensile test,
the low-temperature winding test of the sheath has no crack,
the sheath has no crack in low temperature impact test.
Second part test for Long life and high radiation resistance
Equivalent thermal aging test to withstand a 60 year life:
test methods according to IEEE383-2015,
the test conditions were: winding a finished cable sample with proper length into a plurality of test coils, wherein the effective test length of each coil is more than or equal to 3.05m, and putting the test coils into a circulating air aging oven for accelerated thermal aging. The temperature and time of the thermal aging test are derived from the results of the insulation thermal life evaluation test.
Gamma high irradiation aging resistance test:
test methods according to IEEE383-2015,
the experimental conditions were that the cumulative dose of irradiation of the gamma source was 250kGy,
the performance requirement is that after the test is finished, the sample is straightened and then bent into a coil with the inner diameter not exceeding 20 times of the outer diameter of the cable. After the sample is soaked in water for 1h in a room temperature environment, the sample should pass a voltage resistance test for 5min without breakdown, and the test voltage is calculated according to the insulation thickness as 3150V/mm.
Claims (6)
1. A long-life low-temperature-resistant non-1E-level instrument cable for a nuclear power station and a gentle environment is characterized in that the outer diameter range of the cable is 15-35 mm; the structure of the cable is as follows: the wire cores are twisted in pairs to form a pair twisting group; the pair twisting group and the filling rope are twisted to form a cable core; the cable core is sequentially wrapped with an inner wrapping layer, a shielding layer, an inner liner layer, an outer wrapping layer and an outer sheath;
the wire core is formed by wrapping an insulating layer outside a conductor; the cross-sectional area of the conductor is 0.5-2.5 mm2(ii) a The conductor is formed by stranding tinned copper monofilaments in multiple layers from inside to outside, the diameter range of the tinned copper monofilaments is 0.193-0.243 mm, the stranding pitch-diameter ratio range of the tinned copper monofilaments is 12-20 times, the stranding direction of the tinned copper monofilaments at the outermost layer is in the left direction, and the stranding direction of the tinned copper monofilaments at the adjacent layers is opposite; the insulating layer is made of radiation-resistant low-smoke halogen-free flame-retardant crosslinked polyethylene insulating material;
one or more twisted pairs are arranged, and the twisting pitch is not more than 100 mm;
the single stranded wire group of one pair of stranded wire groups, its direction of twist is the right direction;
the twisting direction of the multi-twisted line group of the plurality of twisted line groups is the left direction; the twisting pitches of adjacent pair twisting groups are different;
the inner wrapping layer is formed by wrapping a polyester belt inside and a low-smoke halogen-free high-flame-retardant cloth belt outside; the wrapping direction of the low-smoke halogen-free high-flame-retardant cloth tape is right, and the wrapping direction of the polyester tape is left; the width of the polyester tape is 15-40 mm, and the lapping and covering rate is not less than 20%; the thickness range of the low-smoke halogen-free high-flame-retardant cloth belt is 0.18-0.22 mm, the width of the low-smoke halogen-free high-flame-retardant cloth belt is 15-40 mm, and the lapping and covering rate is not less than 20%;
the shielding layer is formed by weaving copper wires, the diameter range of single wires of the copper wires is 0.12-0.30 mm, and the weaving density is not less than 80%;
the inner liner layer is made of a low-smoke halogen-free flame-retardant oxygen-insulating layer sheath material, the thickness of the inner liner layer is 1.0-1.2 mm, and the thickness of the thinnest part is not less than 80-0.2 mm of a nominal value;
the outer winding covering layer is formed by winding low-smoke halogen-free high-flame-retardant cloth tapes, the winding direction is the right direction, the nominal thickness range of the low-smoke halogen-free high-flame-retardant cloth tapes is 0.18-0.22 mm, the width of the low-smoke halogen-free high-flame-retardant cloth tapes is 15-40 mm, and the winding covering rate is not less than 20%;
the outer sheath is made of a long-life thermoplastic low-smoke halogen-free flame-retardant polyolefin sheath material, the nominal thickness of the outer sheath is 1.8-2.2 mm, and the thickness of the thinnest part is not less than 80-0.2 mm of the nominal value.
2. The long-life low-temperature-resistant non-1E-level instrument cable for the nuclear power station and the gentle environment as claimed in claim 1, wherein the cable core is formed by co-right-hand twisting of 1-12 pairs of twisted sets and a plurality of filling ropes; the ratio of the twisted pitch to the diameter is 30-40 times; the filling ropes are respectively filled in the center and the side gaps of the cable core.
3. The long life, low temperature tolerant non-1E gauge cable for nuclear power plants and soft environments as claimed in claim 1, wherein the insulating layer has a nominal thickness of 0.6mm and a thinnest point thickness of no less than 90-0.1 mm of the nominal value.
4. The long-life low-temperature-resistant non-1E-grade instrument cable for the nuclear power plant and the gentle environment as claimed in claim 1, wherein the filling rope is a PP rope made of polypropylene mesh tearing fibers for filling, and the diameter of a single PP rope is 4.0 mm.
5. The long-life low-temperature-resistant non-1E-level instrument cable for nuclear power plants and gentle environments as claimed in claim 1, wherein the cross-sectional area of the conductor is 0.5 to 2.5mm2: the outer diameter of the cable is 18.5 mm.
6. The long life, low temperature tolerant instrumentation cable for nuclear power plants and soft environments of claim 5, wherein the diameter of the tinned copper monofilament of the conductor is 0.193mm and the twist pitch ratio is 18 times;
the thickness of the insulating layer is 0.6 mm;
the twisting pitch diameter ratio of the cable core formed by twisting the pair twisting group and the filling rope is 32 times;
the thickness of the polyester tape in the inner wrapping layer is 0.04 mm; the thickness of the low-smoke halogen-free high-flame-retardant cloth belt in the inner wrapping layer is 0.20 mm;
the monofilament diameter of the copper wire in the shielding layer is 0.20 mm;
the thickness of the inner liner layer is 1.0 mm;
the thickness of the low-smoke halogen-free high-flame-retardant cloth belt in the outer wrapping layer is 0.20 mm;
the thickness of the outer sheath is 1.8 mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121885844.0U CN214336378U (en) | 2021-08-12 | 2021-08-12 | Long-life low temperature resistant nuclear power station gentle environmental non-1E level instrument cable |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121885844.0U CN214336378U (en) | 2021-08-12 | 2021-08-12 | Long-life low temperature resistant nuclear power station gentle environmental non-1E level instrument cable |
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| CN214336378U true CN214336378U (en) | 2021-10-01 |
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2021
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