CN214705475U - Halogen-free medium-voltage power cable for tunneling shield equipment - Google Patents
Halogen-free medium-voltage power cable for tunneling shield equipment Download PDFInfo
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Abstract
The utility model provides a tunnelling shield is halogen-free medium voltage power cable for equipment which the structure is: the main wire core, the ground wire core and the control core are twisted to form a cable core, and semi-conductive filling is arranged at the axis position of the cable core; the cable core is sequentially wrapped with a cable core wrapping tape, an inner sheath, a fiber braided reinforcing layer and an outer sheath; the main wire core is formed by sequentially wrapping a semi-conductive wrapping tape layer, a conductor shielding layer, an insulating layer and an insulating shielding layer outside a main wire core tinned copper conductor; the ground wire core is formed by wrapping a semi-conductive extrusion coating outside a tin-plated copper conductor of the ground wire core; the control core is formed by wrapping a control core sheath outside 2 control wire cores after being stranded; the control wire core is formed by wrapping a control core conductor insulating layer outside a control core tin-plated copper conductor; the cable core wrapping tape is a non-woven fabric wrapping tape; the inner sheath is made of thermoplastic polyurethane elastomer TPU sheath material; the fiber weaving reinforcing layer is formed by weaving polyester yarns; the outer sheath is made of thermoplastic polyurethane elastomer TPU sheath materials.
Description
Technical Field
The utility model belongs to the technical field of the cable, specifically a tunnelling shield is halogen-free medium voltage power cable for equipment.
Background
The tunneling shield equipment is a special engineering machine for tunneling, and is known as the king of the engineering machine: the modern tunneling shield equipment integrates light, mechanical, electrical, hydraulic, sensing and information technologies, has the functions of excavating and cutting soil, conveying soil slag, assembling tunnel lining, measuring, guiding, correcting deviation and the like, relates to multiple subject technologies such as geology, construction, machinery, mechanics, hydraulic pressure, electricity, control, measurement and the like, is designed and manufactured in a 'body-measuring clothes' mode according to different geology, has extremely high reliability requirements, and belongs to a technology-intensive product.
The halogen-free medium-voltage power cable for the tunneling shield equipment is one of important electrical matching products of the tunneling shield equipment, and the circuit is required to have high conductivity, tensile strength, flexibility and flexibility, can be suitable for various complex bottom layers, and is safe and reliable.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem that exists among the prior art, the needs of adaptation market development, the utility model provides a tunnelling shield equipment is with not having steamed middling pressure power cable that has high electric conductive property, tensile, soft flexible, can be applicable to multiple complicated bottom, characteristics such as safe and reliable is particularly:
the utility model provides a tunnelling shield is halogen-free medium voltage power cable for equipment which the structure is:
the main wire core, the ground wire core and the control core are twisted to form a cable core, the axis position of the cable core is provided with semi-conductive filling 10, and the cable forming pitch-diameter ratio range is 10.5-12 times;
the cable core is sequentially wrapped with a cable core wrapping tape 9, an inner sheath 11, a fiber braided reinforcing layer 12 and an outer sheath 13;
the main wire core is formed by sequentially wrapping a semi-conductive wrapping tape layer 2, a conductor shielding layer 3, an insulating layer 4 and an insulating shielding layer 5 outside a main wire core tinned copper conductor 1;
the ground wire core is formed by wrapping a semi-conductive extrusion coating layer 7 outside a ground wire core tin-plated copper conductor 6;
the control core is formed by wrapping a control core sheath 15 outside 2 control wire cores after being stranded, and the stranding pitch-diameter ratio is not more than 12; the control wire core is formed by wrapping a control core tin-plated copper conductor 8 with a control core conductor insulating layer 14;
the cable core wrapping tape 9 is a non-woven fabric wrapping tape;
the inner sheath 11 is made of thermoplastic polyurethane elastomer TPU sheath materials, and the nominal thickness of the inner sheath is 5.0-5.8 mm;
the fiber woven reinforcement layer 12 is formed by weaving polyester yarns, the weaving angle range is 40-50 degrees, and the weaving density is not less than 85 percent;
the outer sheath 13 is made of thermoplastic polyurethane elastomer TPU sheath materials, and the thickness range of the outer sheath is 3.0-3.5 mm.
Further:
the cabling pitch-diameter ratio of the cable core is 11 times;
the semi-conductive filler 10 is an unvulcanized semi-conductive rubber filler strip;
the width of the non-woven fabric wrapping tape of the cable core wrapping tape 9 is 40mm, the thickness of the non-woven fabric wrapping tape is 0.1mm, and the width of the wrapping cover is 5.0-12.0 mm;
the nominal thickness of the inner sheath is 5.5 mm;
the polyester yarn of the fiber-woven reinforcing layer 12 is 6600 polyester yarn; the polyester yarns are pre-bundled in the left direction, and the yarn bundling pitch is 16.5mm +/-1.0 mm; the knitting angle is 45 degrees, and the knitting density is 80 percent;
the outer sheath 13 is 3.3mm thick.
In the main wire core:
the main wire core tinned copper conductor is a 6-type tinned copper conductor; the sectional area of the main wire core tinned copper conductor is 35mm2～150mm2；
The main wire core tinned copper conductor is formed by bundling tinned copper monofilaments into a single strand and then twisting a plurality of strands; the bunching direction of the folded yarn is the left direction, the bunching pitch diameter ratio of the folded yarn is 25-30 times, the twisting direction of the compound twisting is the left direction, and the range value of the twisting pitch diameter ratio of the compound twisting of the inner layer is 15-20 times; the range value of the ratio of the twisting pitch diameter of the outer layer complex twisting is 14-16 times; the tin-plated copper monofilament has a nominal diameter of 0.193mm or 0.290 mm;
the semi-conductive wrapping belt layer 2 is formed by wrapping a semi-conductive nylon belt with the thickness of 0.12mm and the width of 40mm, and the width of the covering is not less than 5 mm;
the thinnest point of the conductor shielding layer 3 is 0.50mm, the thickness of the insulating layer 4 is 4.5mm, and the thickness of the insulating shielding layer 5 is not less than 0.60 mm. The conductor shielding layer is formed by extruding and wrapping a semi-conductive conductor shielding material; the insulating layer is formed by extruding medium-voltage ethylene propylene insulating materials; the insulation shielding layer 5 is formed by extruding strippable insulation shielding materials.
Preferably: in the main wire core tinned copper conductor 1, the stranding pitch ratio of the inner layer compound stranding of the folded yarn is 18 times, and the stranding pitch ratio of the outer layer compound stranding is 16 times.
In the earth core:
the earth core tin-plated copper conductor 6 is a 6-class tin-plated copper conductor, and the sectional area of the earth core tin-plated copper conductor is 16/3mm2～70/3mm2；
The ground wire core tinned copper conductor 6 is formed by bundling tinned copper monofilaments into a single strand and then twisting a plurality of strands; the bunching direction of the folded yarn is the left direction, the bunching pitch diameter ratio of the folded yarn is 25-30 times, the twisting direction of the compound twisting is the left direction, the range value of the twist pitch diameter ratio of the compound twisting of the inner layer is 15-20 times, and the range value of the twist pitch diameter ratio of the compound twisting of the outer layer is 14-16 times; the nominal diameter of the tin-plated copper monofilament is 0.290 mm;
the semi-conductive extrusion layer 7 is formed by extruding semi-conductive materials, the nominal thickness is 1.0mm, and the eccentricity is not more than 28%.
Preferably: in the ground wire core tin-plated copper conductor 6, the stranding pitch ratio of the inner layer compound stranding of the stranded wire is 18 times, and the stranding pitch ratio of the outer layer compound stranding is 16 times.
In the control core:
the cross-sectional area of the control core tin-plated copper conductor 8 is 2.5mm2；
The control core tinned copper conductor 8 is formed by bundling tinned copper monofilaments into a single strand and then twisting a plurality of strands; the bunching direction of the folded yarn is the left direction, the bunching pitch diameter ratio of the folded yarn is 25-30 times, the twisting direction of the compound twisting is the left direction, and the range value of the twisting pitch diameter ratio of the compound twisting of the inner layer is 15-20 times; the range value of the ratio of the twisting pitch diameter of the outer layer complex twisting is 14-16 times; the nominal diameter of the tin-plated copper monofilament is slightly 0.145 mm;
the control core conductor insulating layer 14 is formed by extruding and wrapping a semiconductor material, and the thickness is 0.9 mm;
the control core sheath 15 is formed by extruding and wrapping semi-conductive materials, and the thickness is 1.8 mm.
Preferably: in the control core tin-plated copper conductor 8, the twist pitch ratio of the inner layer compound twist of the stranded wire is 18 times, and the twist pitch ratio of the outer layer compound twist is 16 times.
The principle and effect of the technical scheme are explained as follows:
the structure of the cable is as follows: the main wire core, the ground wire core and the control core are cabled, the TPU inner sheath is extruded, the special fiber is woven and reinforced, and the TPU outer sheath is extruded and molded.
The cable conductor (including main core conductor, ground core conductor and control core conductor) adopts the compound twisted structure of stranded, improves the compliance of large cross-section cable. Because the stranded conductor is soft and easy to deform, the cable adopts reasonable parameters of the stranded wire and the compound stranded structure, the stability of the stranded structure of the conductor is met, the outer diameter of the stranded structure of the conductor meets the design and installation requirements, and the surface of the stranded conductor is smooth and round.
The cable main wire core is produced by three-layer co-extrusion of a semiconductive conductor shielding material, a medium-voltage ethylene-propylene insulating material and a strippable insulating shielding material, and the ground wire core and the control core are directly wrapped on the surface of the conductor by uniform and compact extrusion of the semiconductive shielding material, so that the free discharge phenomenon of the cable in a high electric field is avoided, the partial discharge level is effectively reduced, and the insulating property is better.
The cabling structure parameters reasonably design the proportion of the main wire core, the ground wire core, the control core and the reinforcing filling core, and the cabling device is suitable for back-twisting cabling equipment, is beneficial to eliminating stress generated in the cabling process and controlling the take-up and pay-off tension of each wire core. The cabling is suitable for a 3+2+1 symmetrical structure (3 +2+1 is 3 main wire cores +2 ground wire cores +1 control core), and the gaps of the cable cores can be filled with non-hygroscopic materials. The cabling direction is the right direction.
The fiber braided reinforced layer is arranged on the surface of the inner sheath, the requirement of the cable on flexible bending is met by adopting a proper braiding angle, and the tensile property of the cable is improved.
The inner sheath and the outer sheath of the cable are extruded with TPU (thermoplastic polyurethane elastomer) sheath materials, so that the requirements on the properties of good gas resistance, wear resistance, ultraviolet resistance, oil resistance, low temperature resistance, ozone resistance, flame retardance and the like are met.
In the trial-manufacturing process, the cable structure is beneficial to adjusting the tooling die, the extrusion temperature and the take-up and pay-off line tension of the extruder in the product leading-in process, and ensures that the outer diameter, the thickness and the eccentricity of the cable are stably controlled at a higher level and the production smoothness.
The conductor of the cable conforms to the specification of 5 th (control core tin-plated copper conductor) or 6 th (main core tin-plated copper conductor and ground core tin-plated copper conductor) tin-plated copper wires specified in GB/T3956.
The reasonable structural dimension design requirements of the main wire core, the ground wire core and the control core can smoothly pass through a continuous vulcanization production line, and the semi-conductive material is uniformly and tightly extruded on the surface of the conductor for production.
The reasonable cabling pitch-diameter ratio is adopted, so that the paying-off tension of each wire core is uniform, the influence on the bending performance of the cable due to uneven tension is prevented, and the stress generated in the cabling process of the insulated wire cores of the existing untwisting type cabling machine equipment is eliminated.
The cable is used as a main power supply cable of the tunneling shield equipment and is suitable for mobile connection with an external medium-voltage cable when the tunneling shield equipment tunnels.
Drawings
FIG. 1 is a schematic radial cross-sectional view of the present embodiment;
in the figure: the cable comprises a main core tinned copper conductor 1, a semi-conductive wrapping layer 2, a conductor shielding layer 3, an insulating layer 4, an insulating shielding layer 5, a ground core tinned copper conductor 6, a semi-conductive extruding layer 7, a control core tinned copper conductor 8, a cable core wrapping tape 9, semi-conductive filling 10, an inner sheath 11, a fiber braided reinforcing layer 12, an outer sheath 13, a control core conductor insulating layer 14 and a control core sheath 15.
Detailed Description
The technical scheme is further explained by combining the drawings and the detailed implementation mode as follows:
referring to fig. 1, the halogen-free medium voltage power cable for the tunneling shield equipment has the following structure:
the main wire core, the ground wire core and the control core are twisted to form a cable core, the axis position of the cable core is provided with semi-conductive filling 10, and the cable forming pitch-diameter ratio range is 10.5-12 times;
the cable core is sequentially wrapped with a cable core wrapping tape 9, an inner sheath 11, a fiber braided reinforcing layer 12 and an outer sheath 13;
the main wire core is formed by sequentially wrapping a semi-conductive wrapping tape layer 2, a conductor shielding layer 3, an insulating layer 4 and an insulating shielding layer 5 outside a main wire core tinned copper conductor 1;
the ground wire core is formed by wrapping a semi-conductive extrusion coating layer 7 outside a ground wire core tin-plated copper conductor 6;
the control core is formed by wrapping a control core sheath 15 outside 2 control wire cores after being stranded, and the stranding pitch-diameter ratio is not more than 12; the control wire core is formed by wrapping a control core tin-plated copper conductor 8 with a control core conductor insulating layer 14;
the cable core wrapping tape 9 is a non-woven fabric wrapping tape;
the inner sheath 11 is made of thermoplastic polyurethane elastomer TPU sheath materials, and the nominal thickness of the inner sheath is 5.0-5.8 mm;
the fiber woven reinforcement layer 12 is formed by weaving polyester yarns, the weaving angle range is 40-50 degrees, and the weaving density is not less than 85 percent;
the outer sheath 13 is made of thermoplastic polyurethane elastomer TPU sheath materials, and the thickness range of the outer sheath is 3.0-3.5 mm.
In the present example:
3 main wire cores, 2 ground wire cores and 1 control core are arranged; the 3 main wire cores are axisymmetric, and the 2 ground wire cores and the 1 control core are respectively arranged between the adjacent main wire cores.
The cabling pitch-diameter ratio of the cable core is 11 times;
the semi-conductive filler 10 is an unvulcanized semi-conductive rubber filler strip;
the width of the non-woven fabric wrapping tape of the cable core wrapping tape 9 is 40mm, the thickness of the non-woven fabric wrapping tape is 0.1mm, and the width of the wrapping cover is 5.0-12.0 mm;
the nominal thickness of the inner sheath is 5.5 mm;
the polyester yarn of the fiber-woven reinforcing layer 12 is 6600 polyester yarn; the polyester yarns are pre-bundled in the left direction, and the yarn bundling pitch is 16.5mm +/-1.0 mm; the knitting angle is 45 degrees, and the knitting density is 80 percent;
the outer sheath 13 is 3.3mm thick.
In the main wire core:
the main wire core tinned copper conductor is a 6-type tinned copper conductor; the sectional area of the main wire core tinned copper conductor is 35mm2～150mm2；
The main wire core tinned copper conductor is formed by bundling tinned copper monofilaments into a single strand and then twisting a plurality of strands; the bunching direction of the folded yarn is the left direction, the bunching pitch diameter ratio of the folded yarn is 25-30 times, the twisting direction of the compound twisting is the left direction, and the range value of the twisting pitch diameter ratio of the compound twisting of the inner layer is 15-20 times; the range value of the ratio of the twisting pitch diameter of the outer layer complex twisting is 14-16 times; the tin-plated copper monofilament has a nominal diameter of 0.193mm or 0.290 mm;
the semi-conductive wrapping belt layer 2 is formed by wrapping a semi-conductive nylon belt with the thickness of 0.12mm and the width of 40mm, and the width of the covering is not less than 5 mm;
the thinnest point of the conductor shielding layer 3 is 0.50mm, the thickness of the insulating layer 4 is 4.5mm, and the thickness of the insulating shielding layer 5 is not less than 0.60 mm.
Preferably: in the main wire core tinned copper conductor 1, the stranding pitch ratio of the inner layer compound stranding of the folded yarn is 18 times, and the stranding pitch ratio of the outer layer compound stranding is 16 times.
In the earth core:
the earth core tin-plated copper conductor 6 is a 6-class tin-plated copper conductor, and the sectional area of the earth core tin-plated copper conductor is 16/3mm2～70/3mm2；
The ground wire core tinned copper conductor 6 is formed by bundling tinned copper monofilaments into a single strand and then twisting a plurality of strands; the bunching direction of the folded yarn is the left direction, the bunching pitch diameter ratio of the folded yarn is 25-30 times, the twisting direction of the compound twisting is the left direction, the range value of the twist pitch diameter ratio of the compound twisting of the inner layer is 15-20 times, and the range value of the twist pitch diameter ratio of the compound twisting of the outer layer is 14-16 times; the nominal diameter of the tin-plated copper monofilament is 0.290 mm;
the semi-conductive extrusion layer 7 is formed by extruding semi-conductive materials, the nominal thickness is 1.0mm, and the eccentricity is not more than 28%.
Preferably: in the ground wire core tin-plated copper conductor 6, the stranding pitch ratio of the inner layer compound stranding of the stranded wire is 18 times, and the stranding pitch ratio of the outer layer compound stranding is 16 times.
In the control core:
the cross-sectional area of the control core tin-plated copper conductor 8 is 2.5mm2；
The control core tinned copper conductor 8 is formed by bundling tinned copper monofilaments into a single strand and then twisting a plurality of strands; the bunching direction of the folded yarn is the left direction, the bunching pitch diameter ratio of the folded yarn is 25-30 times, the twisting direction of the compound twisting is the left direction, and the range value of the twisting pitch diameter ratio of the compound twisting of the inner layer is 15-20 times; the range value of the ratio of the twisting pitch diameter of the outer layer complex twisting is 14-16 times; the nominal diameter of the tin-plated copper monofilament is slightly 0.145 mm;
the control core conductor insulating layer 14 is formed by extruding and wrapping a semiconductor material, and the thickness is 0.9 mm;
the control core sheath 15 is formed by extruding and wrapping semi-conductive materials, and the thickness is 1.8 mm.
Preferably: in the control core tin-plated copper conductor 8, the twist pitch ratio of the inner layer compound twist of the stranded wire is 18 times, and the twist pitch ratio of the outer layer compound twist is 16 times.
In this example:
the semiconductive conductor shield material constituting the conductor shield layer 3 is designated by the reference number YPJ-35.
The grade of the medium-voltage ethylene propylene insulating material forming the insulating layer 4 is XJ-30D.
The strippable insulation shield material constituting the insulation shield layer 5 is designated by the reference number XPB-30A.
The semiconductive material constituting the semiconductive extrusion layer 7 is of the brand XD-30D.
The semiconductive material constituting the control core conductor insulation layer 14 is of the brand number XD-30D.
The semi-conductive material constituting the control core sheath 15 is of the brand number XD-30D.
The main technical indexes of the cable are detected as follows, and all performance indexes can meet the requirements:
1) insulation tensile strength and elongation at break: not less than 4.2 MPa/200%;
2) the insulation meets the requirement of aging box (135 +/-1 ℃), 168h, and the change rate of tensile strength and elongation at break is required to be less than or equal to +/-30%;
3) tensile strength and elongation at break of the inner and outer sheaths: not less than 25.5 MPa/400%;
4) the inner sheath and the outer sheath meet the requirement of an aging oven (100 +/-1 ℃) for 168 hours, the retention rate of tensile strength is more than or equal to 50 percent, and the retention rate of elongation at break is more than or equal to 75 percent;
5) the 200% stretching strength of the inner sheath and the outer sheath is more than or equal to 5.5N/mm;
6) the tearing strength of the inner sheath and the outer sheath is more than or equal to 14N/mm;
7) the inner and outer sheaths meet the ozone resistance test;
8) the oil resistance test (121 ℃ multiplied by 18h) is satisfied;
9) the low temperature test is satisfied (-40 ℃ multiplied by 4 h);
10) satisfy resistant scrape abrasion test: the acting force is 25N, 25 times, and no crack exists;
11) the ultraviolet resistance test is satisfied: the temperature is 23 ℃, the time is 16h, and after 42d aging, compared with the time before aging, the change rate of the tensile strength and the elongation of the outer sheath is not more than +/-30%; compared with the sample aged for 42 days after the aging of 21 days, the change rate of the tensile strength and the elongation rate is not more than +/-15 percent;
12) satisfy single fire-retardant test: the distance between the lower edge of the upper bracket and the seven points of the carbonization part is more than 50mm, and the distance between the lower edge of the upper bracket and the lower edge of the upper bracket is not more than 540 mm;
13) halogen-free test is satisfied: meets the requirements of GB/T17650.1 and GB/T17650.2.
Claims (8)
1. The utility model provides a tunnelling shield is halogen-free medium voltage power cable for equipment which the characterized by structure is:
the main wire core, the ground wire core and the control core are twisted to form a cable core, semi-conductive filling (10) is arranged at the axis position of the cable core, and the cable forming pitch-diameter ratio range is 10.5-12 times;
a cable core wrapping tape (9), an inner sheath (11), a fiber braided reinforcing layer (12) and an outer sheath (13) are sequentially wrapped outside the cable core;
the main wire core is formed by sequentially wrapping a semi-conductive wrapping tape layer (2), a conductor shielding layer (3), an insulating layer (4) and an insulating shielding layer (5) outside a main wire core tinned copper conductor (1);
the ground wire core is formed by wrapping a semi-conductive extrusion coating layer (7) outside a ground wire core tinned copper conductor (6);
the control core is formed by wrapping a control core sheath (15) outside after 2 control wire cores are stranded, and the stranding pitch-diameter ratio is not more than 12; the control wire core is formed by wrapping a control core tin-plated copper conductor (8) with a control core conductor insulating layer (14);
the cable core wrapping tape (9) is a non-woven fabric wrapping tape;
the inner sheath (11) is made of thermoplastic polyurethane elastomer TPU sheath materials, and the nominal thickness of the inner sheath is 5.0-5.8 mm;
the fiber woven reinforcing layer (12) is formed by weaving polyester yarns, the weaving angle range is 40-50 degrees, and the weaving density is not less than 85 percent;
the outer sheath (13) is made of thermoplastic polyurethane elastomer TPU sheath materials, and the thickness range of the outer sheath is 3.0-3.5 mm.
2. The halogen-free medium voltage power cable for the tunneling shield equipment according to claim 1, wherein the cabling pitch-diameter ratio of the cable core is 11 times;
the semi-conductive filling (10) is a non-vulcanized semi-conductive rubber filling strip;
the width of the non-woven fabric wrapping tape of the cable core wrapping tape (9) is 40mm, the thickness of the non-woven fabric wrapping tape is 0.1mm, and the width of the wrapping cover is 5.0-12.0 mm;
the nominal thickness of the inner sheath is 5.5 mm;
the polyester yarns of the fiber-woven reinforcing layer (12) are 6600 polyester yarns; the polyester yarns are pre-bundled in the left direction, and the yarn bundling pitch is 16.5mm +/-1.0 mm; the knitting angle is 45 degrees, and the knitting density is 80 percent;
the thickness of the outer sheath (13) is 3.3 mm.
3. The halogen-free medium voltage power cable for the tunneling shield equipment according to claim 1, wherein in the main wire core:
the main wire core tinned copper conductor (1) is a 6-type tinned copper conductor; the sectional area of the main wire core tinned copper conductor is 35mm2～150mm2；
The main wire core tinned copper conductor is formed by bundling tinned copper monofilaments into a single strand and then twisting a plurality of strands; the bunching direction of the folded yarn is the left direction, the bunching pitch diameter ratio of the folded yarn is 25-30 times, the twisting direction of the compound twisting is the left direction, and the range value of the twisting pitch diameter ratio of the compound twisting of the inner layer is 15-20 times; the range value of the ratio of the twisting pitch diameter of the outer layer complex twisting is 14-16 times; the tin-plated copper monofilament has a nominal diameter of 0.193mm or 0.290 mm;
the semi-conductive wrapping belt layer (2) is formed by wrapping a semi-conductive nylon belt with the thickness of 0.12mm and the width of 40mm, and the width of the covering is not less than 5 mm;
the thinnest point of the conductor shielding layer (3) is 0.50mm, the thickness of the insulating layer (4) is 4.5mm, and the thickness of the insulating shielding layer (5) is not less than 0.60 mm;
the conductor shielding layer is formed by extruding and wrapping a semi-conductive conductor shielding material; the insulating layer is formed by extruding medium-voltage ethylene propylene insulating materials; the insulation shielding layer is formed by extruding strippable insulation shielding materials.
4. The halogen-free medium voltage power cable for the tunneling shield equipment according to claim 3, wherein in the main wire core tinned copper conductor (1), the stranding pitch diameter ratio of the inner layer compound stranding of the strand is 18 times, and the stranding pitch diameter ratio of the outer layer compound stranding is 16 times.
5. The halogen-free medium voltage power cable for the tunneling shield equipment according to claim 1, wherein in the ground core:
the earth core tin-plated copper conductor (6) is a 6-class tin-plated copper conductor, and the sectional area of the earth core tin-plated copper conductor is 16/3mm2～70/3mm2；
The ground wire core tinned copper conductor is formed by bundling tinned copper monofilaments into a single strand and then twisting a plurality of strands; the bunching direction of the folded yarn is the left direction, the bunching pitch diameter ratio of the folded yarn is 25-30 times, the twisting direction of the compound twisting is the left direction, the range value of the twist pitch diameter ratio of the compound twisting of the inner layer is 15-20 times, and the range value of the twist pitch diameter ratio of the compound twisting of the outer layer is 14-16 times; the nominal diameter of the tin-plated copper monofilament is 0.290 mm;
the semi-conductive extrusion coating layer (7) is formed by extruding semi-conductive materials, the nominal thickness is 1.0mm, and the eccentricity is not more than 28%.
6. The halogen-free medium voltage power cable for the tunneling shield equipment according to claim 5, wherein in the ground wire core tinned copper conductor (6), the stranding pitch diameter ratio of the inner layer compound stranding of the stranded wire is 18 times, and the stranding pitch diameter ratio of the outer layer compound stranding is 16 times.
7. The halogen-free medium voltage power cable for the tunneling shield equipment according to claim 1, wherein the control core comprises:
the cross-sectional area of the control core tin-plated copper conductor (8) is 2.5mm2；
The control core tinned copper conductor is formed by bundling tinned copper monofilaments into a single strand and then twisting a plurality of strands; the bunching direction of the folded yarn is the left direction, the bunching pitch diameter ratio of the folded yarn is 25-30 times, the twisting direction of the compound twisting is the left direction, and the range value of the twisting pitch diameter ratio of the compound twisting of the inner layer is 15-20 times; the range value of the ratio of the twisting pitch diameter of the outer layer complex twisting is 14-16 times; the nominal diameter of the tin-plated copper monofilament is slightly 0.145 mm;
the control core conductor insulating layer (14) is formed by extruding and wrapping a semiconductor material, and the thickness is 0.9 mm;
the control core sheath (15) is formed by extruding and wrapping semi-conductive materials, and the thickness is 1.8 mm.
8. The halogen-free medium voltage power cable for the tunneling shield equipment according to claim 7, wherein in the control core tinned copper conductor (8), the twist pitch ratio of the inner layer compound twist of the stranded wire is 18 times, and the twist pitch ratio of the outer layer compound twist is 16 times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120461457.8U CN214705475U (en) | 2021-03-03 | 2021-03-03 | Halogen-free medium-voltage power cable for tunneling shield equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120461457.8U CN214705475U (en) | 2021-03-03 | 2021-03-03 | Halogen-free medium-voltage power cable for tunneling shield equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114898925A (en) * | 2022-05-31 | 2022-08-12 | 远东电缆有限公司 | Mining trailing cable |
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2021
- 2021-03-03 CN CN202120461457.8U patent/CN214705475U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114898925A (en) * | 2022-05-31 | 2022-08-12 | 远东电缆有限公司 | Mining trailing cable |
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