CN214796852U - High-temperature-resistant instrument cable for nuclear power station gentle environment - Google Patents
High-temperature-resistant instrument cable for nuclear power station gentle environment Download PDFInfo
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- CN214796852U CN214796852U CN202120646657.0U CN202120646657U CN214796852U CN 214796852 U CN214796852 U CN 214796852U CN 202120646657 U CN202120646657 U CN 202120646657U CN 214796852 U CN214796852 U CN 214796852U
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Abstract
The utility model provides a gentle environmental high temperature resistant instrument cable of using of nuclear power station, its structure is: the cable core is sequentially wrapped with a wrapping layer, a shielding layer and a sheath layer from inside to outside; the cable core is formed by jointly twisting ceramic fireproof and fireproof filling ropes and 1 or more stranded groups; the stranded wire group is formed by stranding 2 wire cores; the wire core is composed of a single conductor with an insulating layer; each conductor is formed by stranding nickel-plated copper monofilaments; the insulating layer comprises an inner layer insulation and an outer layer insulation which are sequentially wrapped outside the conductor; the outer layer insulation is made of high-temperature resistant silicon rubber insulation material; the lapping layer is formed by lapping and covering 1 calcined mica tape in an overlapping way; the shielding layer is formed by wrapping a copper strip, and a drainage wire is attached to the inner surface or the outer surface of the shielding layer along the length direction of the cable; the sheath layer is made of flame-retardant silicone rubber material wrapped outside the cable core. The cable can meet the requirements of low smoke and zero halogen besides electrical property and mechanical property; and simultaneously, the requirement of keeping higher insulation resistance at high temperature can be met.
Description
Technical Field
The utility model relates to a high temperature resistant cable under the nuclear power station environment, in particular to gentle environment of nuclear power station is with high temperature resistant instrument cable, it is applicable to the higher control system of the operating environment temperature in conventional island of nuclear power station and BOP subregion sensor and electric cabinet, computer and data processing system's connection, belongs to cable technical field.
Background
The working environment temperature of the conventional island and BOP part area (gentle environment of the nuclear power station) of the nuclear power station is high, and the long-term working temperature of the cable is required to be 200 ℃. The long-term working temperature of the common cable for the nuclear power station is 90 ℃, the cable for the common nuclear power station is used under the condition of long-term working at 200 ℃ (the nuclear-grade cable is degraded and used instead), the service life of the cable is short, the replacement frequency is high, the normal operation of the nuclear power station is influenced, the purchase cost is increased, and the resource waste is also caused. Although the halogen-containing cable is used for a nuclear power station and a gentle environment, the halogen-containing cable has high requirements on the cable, and if the halogen-containing cable can meet the condition that the long-term working temperature is 200 ℃, the halogen-containing cable can generate corrosive gas when a fire disaster occurs, can corrode equipment and also can affect the safety of the nuclear power station and the equipment. Therefore, it is required to develop a cable which can be used under high temperature conditions and does not contain halogen and has a certain irradiation resistance.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved is as follows: the problems that a common low-smoke halogen-free cable cannot run for a long time at high temperature, and a high-temperature-resistant cable is halogen-containing and radiation-resistant are solved.
Technical scheme adopted for solving the technical problems
The utility model provides a high temperature resistant instrument cable for a nuclear power station gentle environment, which can meet the requirements of low smoke and zero halogen except electrical property and mechanical property; and simultaneously, the requirement of keeping higher insulation resistance at high temperature can be met.
In order to achieve the technical purpose, the utility model adopts the following technical scheme:
a long-life high-temperature resistant instrument cable for a nuclear power station and a gentle environment, wherein the diameter range of the cable is 10.0-25.2 mm; the structure is as follows: the cable core is sequentially provided with a wrapping layer 5, a shielding layer 6 and a sheath layer 7 from inside to outside;
the cable core is formed by jointly twisting a ceramic fireproof and fireproof filling rope 4 and 1 stranded wire group, and the pitch-diameter ratio of twisting is not more than 12; the filling ropes and the stranded wire groups are twisted to form a cable core with a round section;
or the cable core is formed by jointly twisting ceramic fireproof and fireproof filling ropes 4 and at least 2 stranded wire groups, and the twisted pitch-diameter ratio is not more than 12; each stranded wire group surrounds the same axis, and a bundle of filling ropes is arranged at the position of the axis; a bundle of filling ropes is arranged between the adjacent stranded wire groups;
the requirement of the cable core is that the appearance is round, which is convenient for the outer layer to wrap and the final cable product to be round. For the case of 1 stranded wire group, the outer wall of the stranded wire group is in a spiral shape with two arc-shaped convex edges, so that the stranded wire group and the filling rope need to be stranded together. In the case of a plurality of twisted wire groups, the axial position around which each twisted wire group surrounds is hollow, and a bundle of filling ropes is arranged at the axial position in order to fill the hollow.
The stranded wire group is formed by stranding 2 wire cores, and the stranding pitch is not more than 100 mm; the self twisting direction of the filling rope is the same as the twisting direction of the stranded wire group;
the wire core is composed of a single conductor 1 with an insulating layer;
each conductor 1 is formed by twisting nickel-plated copper monofilaments, the ratio of the twisting pitch diameter ranges from 15 to 20 times, the diameter range of the nickel-plated copper monofilaments ranges from 0.32mm to 0.52mm, the diameter range of the conductors ranges from 0.9mm to 1.6mm, and the twisting direction of the conductor 1 is the left direction;
compared with the common copper conductor, the nickel-plated copper conductor has better high-temperature resistance and is not easy to oxidize at high temperature; and also has the advantages of good conductivity, corrosion resistance, long service life and the like.
The insulating layer comprises an inner layer insulation 2 and an outer layer insulation 3 which are sequentially wrapped outside the conductor 1; the inner layer insulation 2 is composed of 2 layers of wrapped calcined mica tapes, and the wrapping and covering rate of the mica tapes is not less than 35%; the outer layer insulation 3 is made of high-temperature-resistant silicon rubber insulation material; the structure of the two layers of calcined mica tapes is as follows: wrapping an inner mica tape firstly, and then wrapping an outer mica tape, wherein the wrapping directions of the two mica tapes are opposite;
the calcined mica tape belongs to inorganic materials, and can still maintain good electrical property at high temperature; the high-temperature-resistant silicon rubber has good electrical property, heat resistance and mechanical property.
The filling is composed of ceramic fireproof and fire-resistant filling ropes, and the ceramic fireproof and fire-resistant filling ropes are low-smoke and halogen-free and have the characteristics of high and low temperature resistance, no moisture absorption, good heat dissipation and the like.
The lapping layer 5 is formed by overlapping and lapping 1 calcined mica tape, the lapping direction is left, and the lapping and covering rate is not less than 30%;
the shielding layer 6 is formed by wrapping a copper strip, and one drainage wire is attached to the inner surface or the outer surface of the shielding layer 6 along the length direction of the cable (the scheme is preferably attached to the inner surface of the shielding layer, so that the structural damage to the sheath layer is reduced); the lapping direction of the copper strip is right, and the lapping and covering rate is not less than 25%; the drainage wire is a 5-class copper conductor with the sectional area not less than 0.3mm2；
The sheath layer is made of flame-retardant silicone rubber material wrapped outside the cable core;
the flame-retardant silicone rubber is halogen-free, does not contain phosphorus, nitrogen or heavy metal, and the environmental protection performance meets the ROHS detection standard; has excellent cold and hot alternation resistance, aging resistance and flame retardance.
The high-temperature-resistant long-life cable for the nuclear power station and the gentle environment with the structure can meet the requirements of keeping higher insulation resistance at a high temperature of 200 ℃, and also meet the requirements of basic electrical properties (such as index reflection of conductor resistance, voltage test, insulation resistance test, working capacitance and the like), mechanical properties (such as index reflection of mechanical properties of insulation and sheath layers, thermal extension of insulation and sheath layers and the like), halogen-free (index reflection of gas evolution test during combustion, fluorine content test and the like) and non-toxic (index reflection of toxicity indexes of insulation and sheath layers and the like) performances of the cable.
Further:
the number of the stranded wire groups is 2-6.
The nominal thickness of the mica tape used for the inner layer insulator 2 can be selected from the range of 0.10mm to 0.14mm, and is preferably 0.12 mm.
The nominal thickness of the outer insulation 3 may optionally range from 0.8mm to 1.0mm, preferably 0.8 mm.
The mica tape used for the wrapping layer 5 has a nominal thickness in the optional range of 0.14 mm-0.2 mm, and preferably 0.2 mm.
The minimum thickness of the copper strip of the shield layer 6 is 0.05 mm.
The minimum thickness of the sheath layer is 1.8 mm.
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 control of the pitch of the stranded wire group is beneficial to reducing the signal loss in the signal transmission process, and the control of the pitch of the cable core enables the cable core structure to be firmer.
(2) The nickel-plated copper conductor improves the high-temperature resistance of the conductor and reduces the probability of conductor oxidation.
(3) The mica tape and the extruded silicone rubber insulation can improve the high temperature resistance of the cable and ensure the normal operation of the cable when the working temperature of the conductor is 200 ℃.
(4) The flame retardant property of the cable can be improved by using the ceramic fireproof and fire-resistant filling rope and the mica tape for wrapping.
(5) The copper strip is wrapped and shielded to better shield external electromagnetic interference.
(6) The flame-retardant silicone rubber sheath layer further improves the cold and hot alternation resistance, aging resistance and flame retardance of the cable.
Drawings
Fig. 1 is a schematic radial cross-sectional structure of the cable according to the embodiment.
In the figure: 1-conductor, 2-inner layer insulation, 3-outer layer insulation, 4-filling, 5-wrapping layer, 6-shielding layer and 7-sheath layer.
Detailed Description
The present disclosure is further described with reference to the following drawings and detailed description:
referring to fig. 1, a long-life high-temperature resistant instrument cable for a nuclear power plant and a gentle environment, the diameter of the cable ranges from 10.0mm to 25.2 mm; the structure is as follows: the cable core is sequentially provided with a wrapping layer 5, a shielding layer 6 and a sheath layer 7 from inside to outside;
the cable core is formed by jointly twisting a ceramic fireproof and fireproof filling rope 4 and 1 stranded wire group, and the pitch-diameter ratio of twisting is not more than 12; the filling ropes and the stranded wire groups are twisted to form a cable core with a round section;
or the cable core is formed by jointly twisting ceramic fireproof and fireproof filling ropes 4 and at least 2 stranded wire groups, and the twisted pitch-diameter ratio is not more than 12; each stranded wire group surrounds the same axis, and a bundle of filling ropes is arranged at the position of the axis; a bundle of filling ropes is arranged between the adjacent stranded wire groups; fig. 1 shows 2 twisted wire sets.
The requirement of the cable core is that the appearance is round, which is convenient for the outer layer to wrap and the final cable product to be round. For the case of 1 stranded wire group, the outer wall of the stranded wire group is in a spiral shape with two arc-shaped convex edges, so that the stranded wire group and the filling rope need to be stranded together. In the case of a plurality of twisted wire groups, the axial position around which each twisted wire group surrounds is hollow, and a bundle of filling ropes is arranged at the axial position in order to fill the hollow.
The stranded wire group is formed by stranding 2 wire cores, and the stranding pitch is not more than 100 mm; the self twisting direction of the filling rope is the same as the twisting direction of the stranded wire group;
the wire core is composed of a single conductor 1 with an insulating layer;
each conductor 1 is formed by twisting nickel-plated copper monofilaments, the ratio of the twisting pitch diameter ranges from 15 to 20 times, the diameter range of the nickel-plated copper monofilaments ranges from 0.32mm to 0.52mm, the diameter range of the conductors ranges from 0.9mm to 1.6mm, and the twisting direction of the conductor 1 is the left direction;
the insulating layer comprises an inner layer insulation 2 and an outer layer insulation 3 which are sequentially wrapped outside the conductor 1; the inner layer insulation 2 is composed of 2 layers of wrapped calcined mica tapes (the thickness range is 0.10 mm-0.14 mm), and the wrapping covering rate of the mica tapes is not less than 35%; the outer layer insulation 3 (the thickness range is 0.8 mm-1.0 mm) is made of high-temperature resistant silicon rubber insulation material; the structure of the 2-layer calcined mica tape is as follows: the inner mica tape is wound firstly, and then the outer mica tape is wound, wherein the winding directions of the two layers of mica tapes are opposite.
The lapping layer 5 is formed by overlapping and lapping 1 layer of calcined mica tape (the thickness range is 0.14 mm-0.2 mm), the lapping direction is the left direction, and the lapping and covering rate is not less than 30%;
the shielding layer 6 is formed by wrapping a copper strip, and a drainage wire is attached to the inner surface or the outer surface of the shielding layer 6 (in this case, the inner surface of the shielding layer) along the length direction of the cable; the lapping direction of the copper strip is right, and the lapping and covering rate is not less than 25%; the drainage wire is a 5-class copper conductor with the sectional area not less than 0.3mm2；
The sheath layer is made of flame-retardant silicone rubber material wrapped outside the cable core;
generally speaking, the number of the stranded wire groups is 2-6, which is an economical implementation mode, the stranded wire groups are suitable for the signal transmission requirements of most instruments, the appearance of the cable is round, and the cable is relatively flexible on the premise that the material cost and the manufacturing cost are not greatly increased.
In this example, the number of the twisted wire groups is 2.
The inner insulation 2 is a mica tape with a nominal thickness of 0.12 mm.
The nominal thickness of the outer insulation 3 is 0.8 mm.
Mica tape used around the covering 5, with a nominal thickness of 0.2 mm.
The minimum thickness of the copper strip of the shield layer 6 is 0.05 mm.
The minimum thickness of the sheath layer is 1.8 mm.
The insulation used for the outer insulation 3 is available under the designation HT951T (30).
The jacket material used for the jacket layer 7 is available under the trademark HT4561 ZA.
After the scheme is adopted, the cable can meet the requirements of low smoke and zero halogen besides the electrical property and the mechanical property; and simultaneously, the requirement of keeping higher insulation resistance at high temperature can be met.
The detection results of the cable of this example are as follows:
Claims (7)
1. a high temperature resistant instrument cable for a nuclear power station and a gentle environment is characterized in that the diameter range of the cable is 10.0 mm-25.2 mm; the structure of the cable is as follows: the cable core is sequentially wrapped with a wrapping layer, a shielding layer and a sheath layer from inside to outside;
the cable core is formed by jointly twisting a ceramic fireproof and fireproof filling rope and 1 stranded wire group, and the pitch-diameter ratio of twisting is not more than 12; the filling ropes and the stranded wire groups are twisted to form a cable core with a round section;
or the cable core is formed by jointly twisting ceramic fireproof and fireproof filling ropes and at least 2 stranded wire groups, and the twisted pitch-diameter ratio is not more than 12; each stranded wire group surrounds the same axis, and a bundle of filling ropes is arranged at the position of the axis; a bundle of filling ropes is arranged between the adjacent stranded wire groups;
the stranded wire group is formed by stranding 2 wire cores, and the stranding pitch is not more than 100 mm; the self twisting direction of the filling rope is the same as the twisting direction of the stranded wire group;
the wire core is composed of a single conductor with an insulating layer;
each conductor is formed by twisting nickel-plated copper monofilaments, the ratio of the twisting pitch diameter ranges from 15 to 20 times, the diameter range of the nickel-plated copper monofilaments ranges from 0.32mm to 0.52mm, the diameter range of the conductor ranges from 0.9mm to 1.6mm, and the twisting direction of the conductor is in the left direction;
the insulating layer comprises an inner layer insulation and an outer layer insulation which are sequentially wrapped outside the conductor; the inner layer insulation is formed by 2 layers of wrapped calcined mica tapes, the wrapping coverage rate of the mica tapes is not less than 35%, and the thickness range of the mica tapes is 0.10-0.14 mm;
the outer layer insulation is made of high-temperature-resistant silicon rubber insulation material; the thickness range of the outer layer insulation is 0.8 mm-1.0 mm;
the lapping layer is formed by lapping and overlapping 1 calcined mica tape, the lapping direction is left direction, the lapping and covering rate is not less than 30%, and the thickness range of the mica tape is 0.14 mm-0.2 mm;
the shielding layer is formed by wrapping a copper strip, and a drainage wire is attached to the inner surface or the outer surface of the shielding layer along the length direction of the cable; the lapping direction of the copper strip is right, and the lapping and covering rate is not less than 25%; the drainage wire is a 5-class copper conductor with the sectional area not less than 0.3mm2；
The sheath layer is made of flame-retardant silicone rubber materials wrapped outside the cable core.
2. The high-temperature-resistant instrument cable for the nuclear power plant and the soft environment as claimed in claim 1, wherein the number of the twisted wire groups is 2-6.
3. The high temperature instrument cable for nuclear power plant and soft environment as claimed in claim 1, wherein the nominal thickness of the mica tape for inner layer insulation is 0.12 mm.
4. The high temperature instrument cable for nuclear power plant and soft environment as claimed in claim 1, wherein the nominal thickness of the outer insulation is 0.8 mm.
5. The high temperature instrument cable for nuclear power plant and soft environment as claimed in claim 1, wherein the mica tape for the wrapping layer has a nominal thickness of 0.2 mm.
6. The high temperature instrument cable for nuclear power plant and soft environment as claimed in claim 1, wherein the minimum thickness of the copper strip of the shielding layer is 0.05 mm.
7. The high temperature resistant instrument cable for nuclear power plant and soft environment as claimed in claim 1, wherein the minimum thickness of said sheath layer is 1.8 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120646657.0U CN214796852U (en) | 2021-03-31 | 2021-03-31 | High-temperature-resistant instrument cable for nuclear power station gentle environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120646657.0U CN214796852U (en) | 2021-03-31 | 2021-03-31 | High-temperature-resistant instrument cable for nuclear power station gentle environment |
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| Publication Number | Publication Date |
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| CN214796852U true CN214796852U (en) | 2021-11-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120646657.0U Active CN214796852U (en) | 2021-03-31 | 2021-03-31 | High-temperature-resistant instrument cable for nuclear power station gentle environment |
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- 2021-03-31 CN CN202120646657.0U patent/CN214796852U/en active Active
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