CN112635104A

CN112635104A - Low-capacitance longitudinal differential protection control cable for subway communication

Info

Publication number: CN112635104A
Application number: CN202011305892.8A
Authority: CN
Inventors: 郑菲; 郑树春; 范月华; 郑鑫; 蒋鹏; 印旭超
Original assignee: Maanshan Anhuizhi Electronic Technology Co ltd
Current assignee: Maanshan Anhuizhi Electronic Technology Co ltd
Priority date: 2020-11-19
Filing date: 2020-11-19
Publication date: 2021-04-09

Abstract

The invention relates to the technical field of cables, in particular to a low-capacitance longitudinal differential protection control cable for subway communication, which comprises an outer protection sleeve and an inner protection sleeve, wherein a tensile reinforced layer is fixedly connected inside the outer protection sleeve, a first wear-resistant layer is fixedly connected to the outer wall of the tensile reinforced layer, a steel wire mesh is fixedly connected inside the tensile reinforced layer, a second wear-resistant layer is fixedly connected to the inner wall of the tensile reinforced layer, a second metal armor layer is fixedly connected to the inner wall of the second wear-resistant layer, a second fabric layer is fixedly connected to the inner wall of the second metal armor layer, a first copper belt layer is fixedly connected to the inner wall of the second fabric layer, and a silicon rubber high-temperature-resistant layer is fixedly connected to the inner wall of the first copper belt layer. According to the invention, the copper sheet, the low-density polyethylene insulating material, the steel wire mesh and other structures are arranged, so that the external shielding and toughness of the cable are improved, the safety performance of the cable is further improved, and the service life of the cable is also prolonged.

Description

Low-capacitance longitudinal differential protection control cable for subway communication

Technical Field

The invention relates to the technical field of cables, in particular to a low-capacitance longitudinal differential protection control cable for subway communication.

Typically a rope-like cable made up of several or groups of conductors, each group being at least two, twisted together, with the conductors of each group being insulated from each other, the cable is usually twisted around a center, the whole outer surface is wrapped with a highly insulating covering layer, the cable has the characteristics of internal electrification and external insulation, and the derivation of wires and cables, the new product is mainly characterized in that the cable is twisted around the center according to different application occasions and application requirements, the convenience of equipment, the reduction of equipment cost and the like, the ground traffic is more and more crowded especially in the rapid development of recent years in China due to the adoption of new materials and special materials, or the change of product structures, the improvement of process requirements, or the combination of different products, therefore, the situation that the traffic congestion is completely changed by selecting the subway traffic tool becomes a mainstream development trend, and the subway cable is used as the main electrical equipment of the subway traffic tool and has direct influence on the development of the subway.

The invention belongs to the technical field of cables, and particularly relates to a comprehensive protection type medium-voltage subway cable which comprises a conductor and a wire core formed by a composite insulating layer wrapped outside the conductor, wherein the conductor is a water-blocking conductor and comprises a plurality of copper monofilaments which are regularly arranged and tightly pressed and stranded, water-blocking yarns are filled between layers of the tightly pressed and stranded conductors, and a semi-conductive water-blocking tape is wrapped on the surface of the tightly pressed and stranded conductor; the composite insulating layer consists of a conductor shielding layer, a crosslinked polyethylene insulating layer and an insulating shielding layer which are arranged from inside to outside, the insulating shielding layer is wrapped with a metal shielding layer, and the surface of the metal shielding layer is wrapped with a water-blocking tape; the water-blocking belt is sequentially wrapped with a water-blocking inner sheath layer, an armor layer and an outer sheath layer from inside to outside. The comprehensive protection type medium-voltage subway cable provided by the invention can solve the problems of poor protection performance and large potential safety hazard, and has the advantages of novel structure, advanced materials, excellent use performance, good comprehensive protection performance and safe and reliable operation. The invention still lacks the low-capacitance longitudinal differential protection for the cable in actual use, and further easily causes the problem of a power supply system of a subway due to abnormal power supply in the use process of the cable, and in addition, the tensile property of the cable is still deficient in the use process.

In current cable, the structure is comparatively simple, lead to its in-process of using to appear a large amount of problems easily, in subway operation, if power supply takes place unusually, cause the disorder of its inside electric current easily, and then lead to power transformer to burn out and the major accident such as power supply full line interrupt appears, lead to its risk to obtain increasing, thereby lead to the safety in utilization to reduce, the in-process of laying of cable need bear great pulling force and bending in addition, and then lead to cable outward appearance and inner structure to warp, the fracture of conductive core appears, and then make the cable lose the result of use, and then the life of cable has been reduced.

Therefore, it is desirable to design a low-capacitance longitudinal differential protection control cable for subway communication to solve the above problems.

Disclosure of Invention

The invention aims to provide a low-capacitance longitudinal differential protection control cable for subway communication, which aims to solve the problems of low use safety and no wear-resisting tensile property in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a low-capacitance longitudinal differential protection control cable for subway communication comprises an outer protective sleeve and an inner protective sleeve, wherein a tensile reinforced layer is fixedly connected inside the outer protective sleeve, a first wear-resistant layer is fixedly connected to the outer wall of the tensile reinforced layer, a steel wire mesh is fixedly connected inside the tensile reinforced layer, a second wear-resistant layer is fixedly connected to the inner wall of the tensile reinforced layer, a second metal armor layer is fixedly connected to the inner wall of the second wear-resistant layer, a second fabric layer is fixedly connected to the inner wall of the second fabric layer, a first copper tape layer is fixedly connected to the inner wall of the first copper tape layer, a silicon rubber high-temperature-resistant layer is fixedly connected to the inner wall of the silicon rubber high-temperature-resistant layer, a glass fiber reinforced layer is fixedly connected to the inner wall of the glass fiber reinforced layer, a first metal armor layer is fixedly connected to the inner wall of the glass fiber reinforced layer, and a convex ring is arranged on, the inner wall of the first metal armor layer is fixedly connected with an outer insulating layer, a third wear-resistant layer is fixedly connected between the first metal armor layer and the outer insulating layer, the inner wall of the outer insulating layer is filled with insulating fillers, a copper guide core is arranged inside the inner protective sleeve, an axis lead is arranged at the center of the copper guide core, a waterproof layer is fixedly connected to the inner wall of the inner protective sleeve, a woven reinforcing layer is fixedly connected to the inner wall of the waterproof layer, a first woven fabric layer is fixedly connected to the inner wall of the woven reinforcing layer, a second copper belt layer is fixedly connected to the inner wall of the first woven fabric layer, an inner insulating layer is fixedly connected to the inside of the second copper belt layer, and a copper guide core is arranged inside the inner insulating layer.

Preferably, the outer surface of the outer protective sleeve is provided with a cable length mark and a distance mark which are marked by hot stamping, the outer wall of the first metal armor layer is uniformly provided with convex rings, each convex ring is in the shape of a semicircular ring, every five centimeters of the convex rings are provided with a group, and each convex ring is of a flexible structure and is in a sectional type design.

Preferably, the inner wall of the outer insulating layer is rough and has a thickness of four to eight millimeters, and the insulating filler is extruded inside the outer insulating layer and is located outside the inner protective sleeve.

Preferably, the inner protective sleeve is provided with four groups, and is uniformly arranged in the outer insulating layer in a circumferential arrangement mode, the insulation filler is extruded and filled outside the inner protective sleeve, and the insulation filler is of a flexible structure and is rough.

Preferably, the copper is led the core and is provided with six, and connects through the left-hand transposition, and evenly distributed is at the outer wall of axle center wire, the size of the cross section of copper is a square millimeter, the surface electroplating of copper is led the core has tin.

Preferably, the inside parcel of tensile enhancement layer has the wire net, the wire net includes first steel wire and second steel wire, first steel wire and second steel wire constitute network structure, the wire net is tubular structure, the connected mode of first steel wire and second steel wire is for weaving the connection.

Preferably, the second metal armor layer is uniformly wound on the outside of the second fabric layer at equal intervals, the thickness of the second metal armor layer is zero point two millimeters, the width of the second metal armor layer is two centimeters, and the second metal armor layer is spirally wound.

Preferably, the thickness of the first copper belt layer is zero point one millimeter, a second woven fabric layer is uniformly wound on the surface of the first copper belt layer, and the second woven fabric layer is provided with two layers and is in a spiral winding structure.

Preferably, the thickness of the inner insulating layer is a half-millimeter, the thinnest point of the inner insulating layer is a half-millimeter, and the structure of the second copper tape layer is the same as that of the first copper tape layer.

Preferably, the first wear-resisting layer is the same with the material of second wear-resisting layer, and is flexible structure, and its surface is smooth form, and all is provided with the talcum powder with the contact surface of tensile enhancement layer and outer protective sheath.

Compared with the prior art, the invention has the beneficial effects that:

the low-capacitance longitudinal differential protection control cable for the subway obtains the effect of low capacitance by using low-density polyethylene insulating materials as insulation, the working capacitance between line pairs is small, the insulation resistance and alternating current power frequency withstand voltage are high from the requirement of design line transmission characteristics, obviously, the insulation thickness is larger, the three performance indexes are better, the using safety performance is higher, the weak signal transmitted by the cable can be used for making a corresponding response to a related power transformer so as to avoid the power transformer from being burnt to cause serious accidents such as the interruption of the whole power supply line and the like, in addition, the wear resistance and the tensile resistance of the cable are further improved through the arrangement of a steel wire layer and a double metal armor layer, the use efficiency of the cable can be effectively improved when the cable is laid, the cable can bear larger pulling and bending, and further the laying work is repeatedly carried out, the damage of the cable can be reduced, and in the actual use process, the cable is effectively protected due to the friction resistance and the anti-pulling performance, and the use safety performance of the cable is further improved.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic cross-sectional front view of the present invention;

FIG. 3 is a schematic view of the overall structure of the copper core of the present invention;

FIG. 4 is a schematic cross-sectional view of a copper core according to the present invention;

FIG. 5 is a schematic front view, partially in section, of the present invention;

fig. 6 is a schematic view of the overall structure of the steel wire mesh of the present invention.

In the figure: 1. an outer protective sheath; 2. a first metal armor layer; 3. an outer insulating layer; 4. an inner protective sheath; 5. a copper conductive core; 6. an insulating filler; 7. a tensile reinforcement layer; 8. a second metal armor layer; 9. a first copper tape layer; 10. a silicone rubber high temperature resistant layer; 11. a fiberglass reinforcement layer; 12. steel wire mesh; 31. a first steel wire; 32. a second steel wire; 13. a waterproof layer; 14. weaving the reinforcing layer; 15. a first scrim layer; 16. an inner insulating layer; 17. a second copper tape layer; 18. a convex ring; 19. an axis lead; 20. a first wear resistant layer; 21. a second wear layer; 22. a second scrim layer; 23. and a third wear resistant layer.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-6, an embodiment of the present invention is shown:

the utility model provides a subway general credit low electric capacity longitudinal differential protection control cable, including outer protective sheath 1 and interior protective sheath 4, the inside fixedly connected with tensile enhancement layer 7 of outer protective sheath 1, the outer wall fixedly connected with first wearing layer 20 of tensile enhancement layer 7, the inside fixedly connected with wire net 12 of tensile enhancement layer 7, the inner wall fixedly connected with second wearing layer 21 of tensile enhancement layer 7, the inner wall fixedly connected with second metal armor 8 of second wearing layer 21, the inner wall fixedly connected with second fabric layer 22 of second metal armor 8, the inner wall fixedly connected with first copper tape layer 9 of second fabric layer 22, the inner wall fixedly connected with silicon rubber high temperature resistant layer 10 of first copper tape layer 9, silicon rubber has excellent heat resistance, cold resistance, dielectricity, ozone and resistant atmospheric aging's performance, the outstanding performance of silicon rubber is the service temperature broadness, can use for a long time under the temperature of sixty degrees centigrade below zero or lower temperature to twenty-hundred-fifty degrees centigrade or higher temperature .

The inner wall of the silicon rubber high temperature resistant layer 10 is fixedly connected with a glass fiber reinforced layer 11 which is an inorganic non-metallic material with excellent performance, and has the advantages of good insulativity, strong heat resistance, good corrosion resistance and high mechanical strength, but has the defects of crisp property and poor wear resistance, and is manufactured by taking six kinds of ores of pyrophyllite, quartz sand, limestone, dolomite, borocalcite and boromagnesite as raw materials through processes of high-temperature melting, wire drawing, winding, weaving and the like, the diameter of each monofilament ranges from several micrometers to twenty micrometers, each bundle of fiber precursor consists of hundreds of monofilaments and even thousands of monofilaments, and the glass fiber is usually used as a reinforcing material, an electric insulating material and a heat insulation material in a composite material.

The inner wall of the glass fiber reinforced layer 11 is fixedly connected with a first metal armor layer 2, the outer surface of the first metal armor layer 2 is provided with a convex ring 18, the inner wall of the first metal armor layer 2 is fixedly connected with an outer insulating layer 3, a third wear-resistant layer 23 is fixedly connected between the first metal armor layer 2 and the outer insulating layer 3, the inner wall of the outer insulating layer 3 is filled with an insulating filler 6, the inner part of the inner protective sleeve 4 is provided with a copper guide core 5, the center of the copper guide core 5 is provided with an axis lead 19, the inner wall of the inner protective sleeve 4 is fixedly connected with a waterproof layer 13, the inner wall of the waterproof layer 13 is fixedly connected with a woven reinforcement layer 14, the inner wall of the woven reinforcement layer 14 is fixedly connected with a first textile fabric layer 15, the inner wall of the first textile fabric layer 15 is fixedly connected with a second copper belt layer 17, the inner part of the second copper belt, The film for food and industrial packaging, the cladding and coating of wires and cables, synthetic paper and the like have good flexibility, extensibility, electrical insulation, transparency, processability and certain air permeability, the chemical stability of the film is good, the film is alkali-resistant and resistant to common organic solvents, the copper guide core 5 is arranged in the inner insulating layer 16, the cable formed by the structure has good tensile property and other beneficial effects, and the service life of the cable is effectively prolonged.

Outer protective sheath 1's surface is provided with and has cable length and distance mark through the hot stamp index, the user of being convenient for lays, the outer wall of first metal armor 2 is even is provided with bulge loop 18, bulge loop 18 is the semicircle ring-type, and every five centimetres are provided with a set of, bulge loop 18 is flexible construction, and be the sectional type design, set up through continuous bulge loop 18, can make it form certain groove structure, and then can be through its internal pressure, play the promotion to the compressive effect of cable, it adopts high strength rubber to extrude, can pass through its efficient performance, the realization is to the protection of inside cable core, further also can play the holistic protection to the cable, avoid first metal armor 2 to appear rubbing to the cable.

The inner wall of outer insulating layer 3 is the roughness form, and thickness sets up to four to eight millimeters, the inside extrusion of outer insulating layer 3 has insulating filler 6, and be in the outside of inner protective sheath 4, inner protective sheath 4 is provided with four groups altogether, and evenly set up the inside at outer insulating layer 3 through the mode of circumference range, the outside extrusion packing of inner protective sheath 4 has insulating filler 6, insulating filler 6 is flexible structure, and be the roughness form, copper guide core 5 is provided with six, and connect through the left-hand transposition, and evenly distributed is at the outer wall of axle center wire 19, the size of the cross section of copper guide core 5 is a square millimeter, the surface of copper guide core 5 is electroplated with tin, the tinned copper line material is softer, electric conductive property is good, compare with naked copper line, its corrosion resistance, oxidation resistance is stronger, can prolong weak current cable's life greatly.

The tensile reinforcement layer 7 is wrapped by a steel wire mesh 12, the steel wire mesh 12 comprises a first steel wire 31 and a second steel wire 32, the first steel wire 31 and the second steel wire 32 form a net structure, the steel wire mesh 12 is in a cylindrical structure, the first steel wire 31 and the second steel wire 32 are connected in a weaving mode and used for protecting a cable, the tensile property and the wear resistance of the cable are improved, the service life of the cable is further prolonged, a second metal armor layer 8 is uniformly and equidistantly wound on the outer portion of a second fabric layer 22, the thickness of the second metal armor layer 8 is zero two millimeters, the width of the second metal armor layer is two centimeters, the second metal armor layer is in a spiral winding shape, namely, a layer of metal protection is additionally arranged on the outermost surface of a product to prevent the internal utility layer from being damaged during transportation and installation, if the plastic or lead sheath which plays a role in the "armored cable" is a real protective layer, but a higher-grade cable, the outside is wrapped up in one deck steel band again for protect inside cable, this cable adopts the metal armor to protect, improves its life-span of using.

The thickness of the first copper tape layer 9 is one millimeter at zero, the surface of the first copper tape layer is uniformly wound with a second fabric layer 22, the second fabric layer 22 is provided with two layers and is in a spiral winding structure, the first copper tape layer 9 is prevented from sliding and the inner protective layer can be prevented from disjointing through the arrangement of the second fabric layer 22, the abrasion of the first copper tape layer 9 to the interlayer can be avoided, the thickness of the inner insulating layer 16 is seven millimeters at zero, the thinnest point of the inner insulating layer is six millimeters at zero, the effective insulating effect is ensured, the breakdown caused by the low thickness is avoided, the safety of the cable is further reduced, the structure of the second copper tape layer 17 is the same as that of the first copper tape layer 9, the shielding effect is achieved, the external electromagnetic interference resistance is mainly achieved, the interference of an electromagnetic field generated by the second copper tape layer to the surrounding environment and the fault current passing effect are prevented in the use process, the main direction of the shielding current of the copper tape is spiral, the copper wire is used for shielding the short path through which the current flows, the emitted heat is reduced, the shielding sectional area is increased by using two layers of copper wire shielding, the flowing current is reduced, and the emitted heat is also reduced.

The first wear-resistant layer 20 and the second wear-resistant layer 21 are made of the same material, and are specifically a substrate coated with an anti-sticking coating with friction resistance, the coating comprises a bottom coating and a top coating, the ratio of the total thickness of the bottom coating and the top coating to the longest diameter of ceramic particles is zero eight to two, and the substrate further comprises a composition capable of forming an adhesive coating on a smooth substrate and showing wear resistance, wherein the amount of the ceramic particles is enough to provide at least three such particles on each centimeter-long cross section of the coating formed by the composition, so as to reduce the wear caused by the scouring of materials on equipment parts, the surface of the equipment part is coated with a wear-resistant material which plays a role in protecting the equipment part substrate and has a flexible structure and mainly plays a wear-resistant role, and the metal in the tensile reinforcement layer 7 is prevented from directly contacting with interlayers at two ends to cause the wear of the tensile reinforcement layer, and then reduce the life of cable, its surface is smooth form, and all is provided with the talcum powder with the contact surface of tensile enhancement layer 7 and outer protective sheath 1, chemical stability and good insulating nature, and the cable plays the lubrication action in the fold.

The working principle is as follows: the invention is used by matching with the power control system of the subway in the using process, realizes the connection and the use of related equipment of the subway road, the manufacturing process flow is as follows: braided conductor → extrusion insulation → cabling → lapping shielding → extrusion oversheath → braided armor layer, the produced cable is transported to the installation site for installation and laying, and the length of the cable and the distance mark arranged on the surface of the outer protective sleeve 1 are convenient for selecting the length of the block, and then when laying, it is more convenient, and through the setting of wire net 12 and first metal armor 2, can increase substantially the pull resistance of cable, play the protection to the cable, make its pull-back in laying pull etc. and to reduce to minimumly to the injury of cable, further through the use of first copper tape layer 9 and second copper tape layer 17, can reduce and reduce outside interference, and then make the conveying of cable safety and stability improves its safety in utilization more.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. The utility model provides a subway is low electric capacity longitudinal differential protection control cable for general purpose, includes outer protective sheath (1) and interior protective sheath (4), its characterized in that: the inner part of the outer protective sleeve (1) is fixedly connected with a tensile reinforcement layer (7), the outer wall of the tensile reinforcement layer (7) is fixedly connected with a first wear-resistant layer (20), the inner part of the tensile reinforcement layer (7) is fixedly connected with a steel wire mesh (12), the inner wall of the tensile reinforcement layer (7) is fixedly connected with a second wear-resistant layer (21), the inner wall of the second wear-resistant layer (21) is fixedly connected with a second metal armor layer (8), the inner wall of the second metal armor layer (8) is fixedly connected with a second fabric layer (22), the inner wall of the second fabric layer (22) is fixedly connected with a first copper tape layer (9), the inner wall of the first copper tape layer (9) is fixedly connected with a silicon rubber high-temperature resistant layer (10), the inner wall of the silicon rubber high-temperature resistant layer (10) is fixedly connected with a glass fiber reinforcement layer (11), the inner wall of the glass fiber reinforcement layer (11) is fixedly connected with a, the outer surface of the first metal armor layer (2) is provided with a convex ring (18), the inner wall of the first metal armor layer (2) is fixedly connected with an outer insulating layer (3), a third wear-resistant layer (23) is fixedly connected between the first metal armor layer (2) and the outer insulating layer (3), the inner wall of the outer insulating layer (3) is filled with an insulating filler (6), a copper guide core (5) is arranged inside the inner protective sleeve (4), the center of the copper guide core (5) is provided with an axis lead (19), the inner wall of the inner protective sleeve (4) is fixedly connected with a waterproof layer (13), the inner wall of the waterproof layer (13) is fixedly connected with a woven reinforcing layer (14), the inner wall of the woven reinforcing layer (14) is fixedly connected with a first fabric layer (15), the inner wall of the first fabric layer (15) is fixedly connected with a second copper belt layer (17), an inner insulating layer (16) is fixedly connected to the inside of the second copper strip layer (17), and a copper guide core (5) is arranged inside the inner insulating layer (16).

2. The low capacitance longitudinal differential protection control cable for subway communication according to claim 1, wherein: the outer surface of outer protective sheath (1) is provided with and has cable length and distance mark through the hot stamp mark, the outer wall of first metal armor (2) is even is provided with bulge loop (18), bulge loop (18) are half circular ring form, and every five centimetres are provided with a set ofly, bulge loop (18) are flexible construction, and are the sectional type design.

3. The low capacitance longitudinal differential protection control cable for subway communication according to claim 1, wherein: the inner wall of the outer insulating layer (3) is rough, the thickness of the outer insulating layer is set to be four to eight millimeters, and insulating fillers (6) are extruded inside the outer insulating layer (3) and are located outside the inner protective sleeve (4).

4. The low capacitance longitudinal differential protection control cable for subway communication according to claim 1, wherein: the inner protective sleeve (4) is provided with four groups, and is uniformly arranged in the outer insulating layer (3) in a circumferential arrangement mode, the insulating filler (6) is extruded and filled outside the inner protective sleeve (4), and the insulating filler (6) is of a flexible structure and is rough.

5. The low capacitance longitudinal differential protection control cable for subway communication according to claim 1, wherein: the copper is led core (5) and is provided with six, and connects through the left-hand transposition, and evenly distributed is at the outer wall of axle center wire (19), the size of the cross section of copper is led core (5) is a square millimeter, the surface electroplating of copper is led core (5) has tin.

6. The low capacitance longitudinal differential protection control cable for subway communication according to claim 1, wherein: the inside parcel of tensile enhancement layer (7) has wire net (12), wire net (12) include first steel wire (31) and second steel wire (32), first steel wire (31) constitute network structure with second steel wire (32), wire net (12) are the tubular structure, the connected mode of first steel wire (31) and second steel wire (32) is for weaving the connection.

7. The low capacitance longitudinal differential protection control cable for subway communication according to claim 1, wherein: the second metal armor layer (8) is uniformly wound outside the second fabric layer (22) at equal intervals, the thickness of the second metal armor layer (8) is zero point two millimeters, the width of the second metal armor layer is two centimeters, and the second metal armor layer is spirally wound.

8. The low capacitance longitudinal differential protection control cable for subway communication according to claim 1, wherein: the thickness of the first copper belt layer (9) is one millimeter at zero, a second fabric layer (22) is uniformly wound on the surface of the first copper belt layer, and the second fabric layer (22) is provided with two layers and is of a spiral winding structure.

9. The low capacitance longitudinal differential protection control cable for subway communication according to claim 1, wherein: the thickness of the inner insulating layer (16) is zero seven millimeters, the thinnest point of the inner insulating layer is zero six three millimeters, and the structure of the second copper tape layer (17) is the same as that of the first copper tape layer (9).

10. The low capacitance longitudinal differential protection control cable for subway communication according to claim 1, wherein: the first wear-resistant layer (20) and the second wear-resistant layer (21) are made of the same material and are of a flexible structure, the surfaces of the first wear-resistant layer and the second wear-resistant layer are smooth, and talcum powder is arranged on the contact surfaces of the tensile reinforcing layer (7) and the outer protective sleeve (1).