CN214336369U - Long-life non-1E-level power cable for nuclear power station gentle environment - Google Patents
Long-life non-1E-level power cable for nuclear power station gentle environment Download PDFInfo
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- CN214336369U CN214336369U CN202120621851.3U CN202120621851U CN214336369U CN 214336369 U CN214336369 U CN 214336369U CN 202120621851 U CN202120621851 U CN 202120621851U CN 214336369 U CN214336369 U CN 214336369U
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Abstract
A long-life non-1E-level power cable for a nuclear power station and a gentle environment is formed by sequentially wrapping a wrapping layer and an outer protective layer outside a cable core; the cable core is formed by twisting a plurality of wire cores and a plurality of filling ropes; the wire core is formed by wrapping an insulating layer outside a conductor; the wire core and the filling rope are in a common right-handed twisted structure; the filling rope is formed by twisting non-hygroscopic rock wool materials; the wrapping layer is formed by left-handed wrapping of a high-flame-retardant low-smoke halogen-free flame-retardant cloth tape; the outer protective layer is made of a long-life thermoplastic low-smoke halogen-free flame-retardant polyolefin material. The cable has the advantages of excellent price, nuclear radiation resistance, good flame retardant property and long service life.
Description
Technical Field
The utility model relates to a power cable, in particular to gentle environment is with long-life non-1E level power cable, is applicable to rated voltage 0.6/1 kV's power cable, belongs to cable technical field.
Background
In the case of power cables used in BOP and conventional island regions in the gentle environment of a nuclear power station, if the power cables are used across regions or need not to be replaced and used within a 60-year service life, the nuclear-grade cables need to be degraded and used instead, so that the economy is reduced, and resource waste is also caused.
Although the cable is a nuclear power plant and is 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, 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
Technical problem to be solved
The actual requirement condition to the gentle environment power cable of nuclear power station, the utility model discloses the cable is on the basis that possesses basic electrical property and the mechanical properties of cable itself, and the problem that needs to solve emphatically mainly has:
in order to ensure that the cable can still normally work under the nuclear radiation of a gentle environment, the insulating layer and the outer protective layer are required to have the 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 process need to be designed.
Technical scheme adopted for solving the technical problems
In order to achieve the technical purpose, the utility model adopts the following technical scheme:
a gentle environment uses the long-lived non-1E level power cable, its structure is to wrap up around covering and outer jacket to form sequentially outside the cable core;
the cable core is formed by twisting a plurality of wire cores and a plurality of filling ropes;
the wire core is formed by wrapping an insulating layer outside a conductor; the diameter range of the conductor is 1.56 mm-18.5 mm; the conductor is formed by twisting annealed soft round copper monofilaments, the ratio of the twisting pitch diameter of the copper monofilaments ranges from 25 to 35, and the twisting direction of the copper monofilaments is left; the diameter range of the copper monofilament is 0.15 mm-2.35 mm; the thickness of the insulating layer is 0.53-1.8 mm; the insulating layer is composed of irradiation-resistant low-smoke halogen-free flame-retardant crosslinked polyethylene insulating materials and has an insulating mark of FPE162-1, and single-layer insulating extrusion is relatively to double-layer extrusion of 1E-level cables, so that the production control difficulty is greatly reduced, and the cable is easier to introduce into production.
The cable core and the filling rope are of a common right-handed twisting structure, the twisting pitch diameter ratio ranges from 35 to 45, the twisting pitch diameter ratio is relatively large in correction, and the production efficiency can be effectively improved;
the filling rope is formed by twisting non-hygroscopic rock wool materials; the strong compound stranded low smoke and zero halogen flame retardant packing rope of toughness of packing rope fills in the center and the avris clearance of 2 ~ 5 core cables more easily, makes the cable roundness improve, improves the flame retardant property of cable simultaneously.
The wrapping layer is formed by left-handed wrapping of a high-flame-retardant low-smoke halogen-free flame-retardant cloth tape; the thickness range of the high-flame-retardant low-smoke halogen-free flame-retardant cloth belt is 0.19-0.22 mm; the lapping rate range is 15% -20%.
The outer protective layer is made of a long-life thermoplastic low-smoke halogen-free flame-retardant polyolefin material, and the grade of the protective layer material is HW 4690-H; the nominal thickness of the outer protective layer is 1.4-3.2 mm, and the thickness of the thinnest part is not less than 80-0.2 mm of the nominal value. The sheath can use crowded tubular production, and for the extrusion formula thickness of controlling more easily, the degree of difficulty greatly reduced of leading-in production.
In the example, the insulating layer is a single-layer extrusion structure, the nominal thickness of the insulating layer is 1.7mm, and the thickness of the thinnest point is not less than 90-0.1 mm of the nominal value.
The long-life non-1E-level power cable with the structure and the gentle environment meets the basic requirements of cable electrical performance and the like, and is characterized in that a stranded annealed copper wire stranded conductor, a long-life low-smoke halogen-free flame-retardant radiation-resistant low-smoke halogen-free flame-retardant cross-linked polyethylene insulation, a non-hygroscopic rock wool material stranded filling rope, a radiation-resistant thermoplastic low-smoke halogen-free flame-retardant polyolefin sheath material and the like are adopted. On the premise of adopting the radiation-resistant and long-life insulating sheath material to improve the service life and the irradiation resistance of the cable, the high-flame-retardant low-smoke halogen-free flame-retardant cloth belt and the plurality of non-hygroscopic rock wool ropes are simultaneously used for filling to improve the flame-retardant performance of the cable with a simple structure.
Advantageous effects
After the technical scheme is adopted, the utility model discloses following beneficial effect has:
(1) the cable structure has simple and reasonable design: the complex wrapping structure in the conventional cable structure is reduced, the number of insulating extrusion layers is reduced, and a single-layer extrusion mode is used, so that the cable is more portable.
(2) The cable integrally meets the requirements of low-smoke halogen-free flame-retardant performance by using low-smoke halogen-free flame-retardant filling and sheath materials, and prevents fire from spreading due to the cable.
(3) The insulating layer and the outer protective layer are made of materials with radiation resistance and long service life, and the insulating layer and the outer protective layer are matched with the insulating and sheath structure, so that the service life and the radiation resistance of the cable are improved.
(4) The high flame-retardant low-smoke halogen-free flame-retardant cloth belt and the plurality of non-hygroscopic rock wool rope filling ropes are twisted with the wire core together, so that the gaps of the cable core are less, and the flame retardant property of the cable with a simple and convenient process structure is greatly improved.
(5) The cooperation of the single-layer extrusion of insulation and the extruded tube type production of the sheath ensures the performance of the cable and greatly reduces the production control difficulty, so that the cable is easier to be introduced into production.
The utility model discloses the cable has used high-quality material and specific structural parameter in order to reach the life of extension cable simultaneously on the basis of new design cable shape structure, 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: 1. a conductor; 2. an insulating layer; 3. filling a rope; 4. wrapping a covering; 5. an outer jacket;
Detailed Description
The present disclosure is further described with reference to the following drawings and detailed description:
as shown in figure 1, the long-life non-1E-level power cable for the nuclear power station and the mild environment is characterized in that a wrapping layer and an outer protective layer are sequentially wrapped outside a cable core, wherein the outer diameter range of the cable is 11.0-75.0 mm;
the cable core is formed by twisting three wire cores and a plurality of filling ropes; the wire core and the filling rope are of a common right-handed twisting structure, and the twisting pitch-diameter ratio ranges from 35 to 45;
the wire core is formed by wrapping an insulating layer outside a conductor; the diameter range of the conductor is 1.56 mm-18.5 mm; the conductor is formed by twisting annealed soft round copper monofilaments, the ratio of the twisting pitch diameter of the copper monofilaments ranges from 25 to 35, and the twisting direction of the copper monofilaments is left; the diameter range of the copper monofilament is 0.15 mm-2.35 mm;
the thickness of the insulating layer is 0.53-1.8 mm; the insulating layer is made of radiation-resistant low-smoke halogen-free flame-retardant crosslinked polyethylene insulating material;
the wrapping layer is formed by left-handed wrapping of a high-flame-retardant low-smoke halogen-free flame-retardant cloth tape; the thickness range of the high-flame-retardant low-smoke halogen-free flame-retardant cloth belt is 0.19-0.22 mm; the lapping rate range is 15-20%;
the outer protective layer is made of a long-life thermoplastic low-smoke halogen-free flame-retardant polyolefin sheath material; the nominal thickness of the outer protective layer is 1.4-3.2 mm, and the thickness of the thinnest part is not less than 80-0.2 mm of the nominal value.
Preferably, the insulating layer is of an extruded structure, and the nominal thickness of the insulating layer is 0.7-1.7 mm (1.5 mm)2～240mm2The conductor is selected with a nominal thickness according to the GB/T12706.1), and the thickness of the thinnest point is not less than 90-0.1 mm of the nominal value.
The filling rope is formed by twisting non-hygroscopic rock wool materials; the filling rope is arranged between the adjacent wire cores, and the axial line position of the cable is the filling rope. The composite multi-strand low-smoke halogen-free flame-retardant filling rope with high toughness of the filling rope can be filled into the gaps between the center and the side of a cable core more easily, so that the roundness of the cable is improved, and the flame retardant property of the cable is improved.
Now 3X 185(3 cores, conductor cross-sectional area 185 mm)2) The following description is made by taking the specification as an example, and after the structure is adopted by the cable,
the outer diameter of the cable is 47.8 mm;
the stranding pitch diameter ratio of the cable core is 35 times;
the diameter of the copper monofilament is 2.62mm, and the stranding pitch-diameter ratio is 28 times;
the thickness of the insulating layer (the mark is FPE162-1) is 1.6 mm;
the thickness of the high-flame-retardant low-smoke halogen-free flame-retardant cloth belt is 0.2mm, and the lapping and covering rate range is 15-20%;
the thickness of the outer sheath (brand HW4690-H) is 2.5 mm.
The present solution is a degraded product of a class 1E cable, mainly distinguished by the use of a single layer of less expensive insulation material that also has a 60 year life, but which does not have flame retardant properties and therefore cannot be rated as a class 1E product.
The single-layer extrusion structure of the insulating layer simplifies the insulating production, is easier to realize for production and manufacture, and reduces the production difficulty in the aspects of eccentricity, concentricity, average thickness and the like.
The outer sheath is made of a low-price radiation-resistant low-smoke halogen-free flame-retardant thermoplastic sheath material, so that the overall manufacturing cost of the non-1E-level cable is reduced.
The cable application occasion of the scheme is suitable for a gentle environment irrelevant to the safety of the nuclear power station.
After selecting for use the material of insulating layer and restrictive coating, in order to make the cable possess the flame retardant property the same with former 1E level product, the cooperation has used the fire-retardant low smoke and zero halogen tape of high fire-retardant in this scheme, chooses for use relatively less to overlap the rate of covering around the package, can compensate the influence that the whole beam forming flame retardant property of insulating non-flame retardant design back caused the cable.
Compared with a 1E-level cable, the cable has the advantages that a single-layer long-life insulating material is adopted, a double-layer insulating co-extrusion process is omitted, and the economy of the cable is improved. Meanwhile, the irradiation-resistant low-smoke halogen-free flame-retardant material is adopted, so that the cable has good bundled flame-retardant performance and can meet the technical conditions of non-1E-level cables in mild environments.
The utility model discloses the cable has the advantage to include: the material has the advantages of nuclear radiation resistance, good flame retardant property, long service life and economy.
After the scheme is adopted, the service life of the cable reaches more than 60 years, the cable is good in irradiation resistance and processability, and simple and convenient to process, and the production efficiency can be effectively improved. And simultaneously meets the basic requirements of electrical and mechanical properties.
The cable of this example can be subjected to the following tests, the test result being a pass.
Claims (7)
1. A long-life non-1E-level power cable for a nuclear power station and a gentle environment is characterized in that a wrapping layer and an outer protective layer are sequentially wrapped outside a cable core, wherein the outer diameter range of the cable is 11.0-75.0 mm;
the cable core is formed by twisting three wire cores and a plurality of filling ropes; the wire core and the filling rope are of a common right-handed twisting structure, and the twisting pitch-diameter ratio ranges from 35 to 45;
the wire core is formed by wrapping an insulating layer outside a conductor; the diameter range of the conductor is 1.56 mm-18.5 mm; the conductor is formed by twisting annealed soft round copper monofilaments, the ratio of the twisting pitch diameter of the copper monofilaments ranges from 25 to 35, and the twisting direction of the copper monofilaments is left; the diameter range of the copper monofilament is 0.15 mm-2.35 mm;
the thickness of the insulating layer is 0.53-1.8 mm; the insulating layer is made of radiation-resistant low-smoke halogen-free flame-retardant crosslinked polyethylene insulating material;
the wrapping layer is formed by left-handed wrapping of a high-flame-retardant low-smoke halogen-free flame-retardant cloth tape; the thickness range of the high-flame-retardant low-smoke halogen-free flame-retardant cloth belt is 0.19-0.22 mm; the lapping rate range is 15-20%;
the outer protective layer is made of a long-life thermoplastic low-smoke halogen-free flame-retardant polyolefin sheath material; the nominal thickness of the outer protective layer is 1.4-3.2 mm, and the thickness of the thinnest part is not less than 80-0.2 mm of the nominal value.
2. The long-life non-1E-level power cable for the nuclear power plant and the mild environment as claimed in claim 1, wherein the insulating layer is of a wrapped structure, the nominal thickness of the insulating layer is 0.7-1.7 mm, and the thickness of the thinnest point is not less than 90-0.1 mm of the nominal value.
3. The environmentally friendly long life non-1E-rated power cable as recited in claim 1, wherein said fill rope is formed by stranding non-hygroscopic rock wool material; the filling rope is arranged between the adjacent wire cores, and the axial line position of the cable is the filling rope.
4. A long life non-1E grade power cable for nuclear power plant and soft environment as claimed in claim 1, wherein the cross-sectional area of the conductor is 185mm2(ii) a The outer diameter of the cable is 47.8 mm; the stranding pitch diameter ratio of the cable core is 35 times; the diameter of the copper monofilament is 2.62mm, and the twist pitch ratio of the copper monofilament is 28 times.
5. The environmentally safe long life non-1E grade power cable of claim 4, wherein the thickness of the insulation layer is 1.6 mm.
6. The long-life non-1E-level power cable for the nuclear power plant and the gentle environment as claimed in claim 4, wherein the thickness of the high-flame-retardant low-smoke halogen-free flame-retardant cloth tape is 0.2mm, and the lapping rate is 15% -20%.
7. The environmentally safe long life non-1E grade power cable of claim 4, wherein the outer jacket has a thickness of 2.5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120621851.3U CN214336369U (en) | 2021-03-27 | 2021-03-27 | Long-life non-1E-level power cable for nuclear power station gentle environment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120621851.3U CN214336369U (en) | 2021-03-27 | 2021-03-27 | Long-life non-1E-level power cable for nuclear power station gentle environment |
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| Publication Number | Publication Date |
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| CN214336369U true CN214336369U (en) | 2021-10-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120621851.3U Active CN214336369U (en) | 2021-03-27 | 2021-03-27 | Long-life non-1E-level power cable for nuclear power station gentle environment |
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| CN (1) | CN214336369U (en) |
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2021
- 2021-03-27 CN CN202120621851.3U patent/CN214336369U/en active Active
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