Double-specification and double-shielding control flexible cable for transformer equipment and manufacturing method of double-specification and double-shielding control flexible cable

Abstract

The invention relates to the technical field of cables and wires, and discloses a double-specification double-shielding control flexible cable for transformation equipment, which comprises nine conductors, and the nine conductors are divided into a three-wire group and three paired wire groups; the three-wire group comprises three conductors which are arranged side by side, each paired wire group comprises two conductors which are arranged side by side, the outer surface of each conductor is tightly wrapped with an insulating layer, the outer side of the insulating layer of the three-wire group is additionally provided with a branch shielding braid layer which is used for providing first-stage electromagnetic shielding, and the branch shielding braid layer is used for providing second-stage electromagnetic shielding. The outer side of the three-wire group and the outer side of the three-wire group are jointly wrapped with a total shielding braid layer to serve as second-stage electromagnetic shielding. The double-specification and double-shielding control flexible cable for the transformer equipment aims to solve the problems of insufficient current bearing and signal transmission flexibility, limited electromagnetic shielding effect, poor flexibility, poor wear resistance, poor flame retardant property, poor environmental adaptability and the like caused by single-specification and single-shielding structures generally existing in control cables for the current transformer equipment.

Description

Technical Field

[0001] The invention relates to the technical field of cables and wires, and in particular to a double-specification double-shielded control soft cable for transformer equipment and a manufacturing method thereof. Background Art

[0002] With the vigorous development of the electric power industry and the machinery manufacturing industry, transformer equipment plays a vital role in modern society. They are widely used in power systems, industrial production, transportation and various public facilities, and have become an indispensable infrastructure to support social operations. Transformer equipment ensures the efficiency and safety of power transmission from power stations to users by accurately adjusting the voltage. In the power system, they can effectively reduce power loss and improve energy efficiency; in the field of industrial production, stable voltage supply provides reliable power guarantee for various precision equipment; in transportation, whether it is the high-speed rail or the smooth running of electric vehicles, they are inseparable from the stable support of transformer equipment; and in public facilities, transformer equipment ensures the smooth operation of urban lighting, water supply, communication and other systems.

[0003] However, the control cables on the current market generally have certain technical limitations, which are mainly reflected in the fact that most of them adopt a single-specification, single-shielded structure. Although this design can meet the basic power transmission and control needs to a certain extent, it is powerless when facing the increasingly complex and diverse application scenarios inside the transformer equipment. The single-specification conductor design makes the cable lack flexibility in carrying current and transmitting signals, and cannot be accurately matched according to the specific needs of different application scenarios, thereby limiting the full performance of the transformer equipment. At the same time, although the single-shielded structure can provide a certain electromagnetic interference shielding effect, its shielding effectiveness is often insufficient when facing a high-intensity, complex and changeable electromagnetic environment, and it is difficult to ensure the purity and stability of signal transmission. In addition, with the development of transformer equipment towards intelligence and miniaturization, higher requirements are also put forward for the softness, wear resistance, flame retardancy and environmental adaptability of control cables. Traditional single-specification, single-shielded control cables are often difficult to achieve ideal conditions in these aspects, thus affecting the overall performance and reliability of the transformer equipment. Summary of the invention

[0004] The purpose of the present invention is to solve the problems of insufficient current carrying and signal transmission flexibility, limited electromagnetic shielding effect, poor softness, wear resistance, flame retardancy and environmental adaptability caused by the single-specification and single-shielding structure commonly found in control cables for current transformer equipment, and to propose a double-specification double-shielded control soft cable for transformer equipment and a manufacturing method thereof.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] A double-specification double-shielded control soft cable for transformer equipment comprises nine conductors, wherein the nine conductors are divided into a three-wire group and three pairs of wire groups; the three-wire group comprises three parallel conductors, and each pair of wire groups comprises two parallel conductors, and the outer surface of each conductor is tightly wrapped with an insulating layer, and a sub-shielding braided layer is additionally arranged outside the insulating layer of the three-wire group to provide a first-level electromagnetic shielding, and the outer sides of the three-wire group and the three pairs of wire groups are jointly wrapped with a general shielding braided layer as a second-level electromagnetic shielding; the outer side of the general shielding braided layer is further covered with a tape layer to enhance the stability and protection performance of the cable structure; and the outermost layer of the tape layer is provided with a sheath layer to provide ultimate physical protection and environmental adaptability.

[0007] A method for manufacturing a double-specification double-shielded control soft cable for transformer equipment comprises the following steps:

[0008] S10. Prepare the conductor. The conductor adopts a double-specification structure and conforms to the sixth type of bare copper conductor in GB / T3956 standard. The diameter of the single wire does not exceed 0.15mm. It is formed by the regular twisting process of soft copper wire, and the twisting direction is all right;

[0009] S20, forming an insulating layer by extrusion on the outer surface of the conductor, wherein the insulating layer is made of polyvinyl chloride material, has a temperature resistance grade of 70°C, has a thinnest point of not less than 90% of the nominal thickness, and has an out-of-roundness of not more than 10%;

[0010] S30, dividing the conductor into a three-wire group and three pair-wire groups, wherein the three-wire group includes three parallel conductors, and each pair-wire group includes two parallel conductors, and each wire group is twisted or twisted, and then wrapped with a polyester tape;

[0011] S40, weave a shielding braided layer outside the insulation layer of the three-wire group, using a braided wire with a single wire diameter of 0.12mm and a braiding density greater than 85%;

[0012] S50, three pairs of wires and one three-wire group are twisted into cables by a cabling machine, the pitch of the cables is not more than 16 times, low-smoke zero-halogen filling rope is added inside the cables, and polyester tape is wrapped around the outside;

[0013] S60, weave the overall shielding braided layer on the outside of the cable, using a braided wire with a single wire diameter of 0.15mm and a braiding density greater than 90%;

[0014] S70, a tape layer is provided outside the general shielding braided layer, and a low-smoke halogen-free flame-retardant tape is used;

[0015] S80, a sheath layer is set outside the tape layer, made of highly flame-retardant polyvinyl chloride material to meet the flame-retardant test requirements of the cable

[0016] Based on the above technical solution, the present invention can also be improved as follows.

[0017] Furthermore, the insulating layer is extruded by an extruder, and an anti-aging agent is added to the polyvinyl chloride material of the insulating layer.

[0018] Furthermore, the three-wire group and each pair of wires are wrapped with a layer of polyester tape after twisting or pair twisting. The two side-by-side conductors of the pair of wires are twisted with unequal pitches, and the three side-by-side conductors of the three-wire group are twisted in reverse.

[0019] Furthermore, the braiding density of the sub-shielding braided layer and the overall shielding braided layer is respectively greater than 85% and 90%, and the sub-shielding braided layer and the overall shielding braided layer are both braided with tinned copper wires.

[0020] Furthermore, the sheath layer is made of highly flame-retardant polyvinyl chloride material with an oxygen index of not less than 38, the low-smoke halogen-free flame-retardant tape of the tape layer is also added with an anti-ultraviolet agent, and the highly flame-retardant polyvinyl chloride material of the sheath layer is also added with an anti-wear agent.

[0021] Furthermore, the dual-gauge structure of the conductor includes a thicker gauge and a thinner gauge, the thicker gauge conductor is used for the three-wire group, and the thinner gauge conductor is used for the pair group, so as to optimize the transmission performance and mechanical strength of the cable.

[0022] Furthermore, the manufacturing process also includes multiple quality inspection steps, such as conductor resistance test, insulation resistance test, shielding effect test and flame retardant performance test, to ensure that the quality of the cable meets the relevant standards and requirements.

[0023] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0024] The present invention proposes a double-specification double-shielded control soft cable for transformer equipment, which contains nine conductors and is cleverly divided into a three-wire group and three pair-wire groups. This design not only increases the number of conductors inside the cable, but also can flexibly adapt to different current transmission requirements through different combinations, thereby improving the current carrying capacity and signal transmission flexibility of the cable. At the same time, the outer surface of each conductor is tightly wrapped with an insulating layer to ensure electrical isolation between the conductors, further improving the safety and reliability of the cable. A double-layer shielding structure is also adopted, namely a sub-shielding braided layer and a total shielding braided layer. The sub-shielding braided layer is arranged on the outside of the insulating layer of the three-wire group, providing the cable with a first-level electromagnetic shielding, effectively blocking the electromagnetic interference from the inside of the cable, and the total shielding braided layer is wrapped on the outside of the entire cable as a second-level electromagnetic shielding, further enhancing the electromagnetic shielding effect of the cable. The design of this double-layer shielding structure enables the cable to maintain the purity and stability of signal transmission when facing a high-intensity, complex and changeable electromagnetic environment, thereby ensuring the normal operation of the transformer equipment.

[0025] In addition, the present invention improves the overall performance of the cable by optimizing the manufacturing method of the cable. For example, in the conductor preparation stage, the sixth type of bare copper conductor that meets the GB / T3956 standard is used, and the soft copper wire is twisted through a regular twisting process to ensure the conductive performance and mechanical strength of the conductor. In the insulation layer extrusion stage, polyvinyl chloride material is used, and the thickness and out-of-roundness of the insulation layer are strictly controlled to ensure the uniformity and reliability of the insulation layer. In the processing stage of the pair group and the three-wire group, the stability and anti-interference ability of the wire group are improved through precise twisting or twisting processing and wrapping with polyester tape. In the shielding layer braiding stage, high-density braided wire is used to ensure The shielding effect and durability of the shielding layer. During the sheath layer setting stage, a highly flame-retardant polyvinyl chloride material is used to make the sheath layer, which meets the flame retardant test requirements of the cable and improves the safety and environmental adaptability of the cable. In summary, the double-specification double-shielded control soft cable for transformer equipment of the present invention and its manufacturing method, by adopting a double-specification conductor design, a double-layer shielding structure and an optimized manufacturing method, effectively solves the problems existing in the prior art, improves the current carrying capacity and signal transmission flexibility of the cable, enhances the electromagnetic shielding effect, optimizes the softness, wear resistance, flame retardancy and environmental adaptability of the cable, and meets the high requirements of transformer equipment for control cables. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The present invention is a schematic structural diagram of a double-specification double-shielded control soft cable for transformer equipment.

[0027] In the figure: 1. Conductor; 2. Insulation layer; 3. Wire pair group; 4. Triple wire group; 5. Separate shielding braided layer; 6. Overall shielding braided layer; 7. Tape layer; 8. Sheath layer. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Combination Figure 1 As shown, a double-specification double-shielded control soft cable for transformer equipment of the present invention includes nine conductors 1, which are divided into a three-wire group 4 and three pair-wire groups 3; the three-wire group 4 contains three parallel conductors 1, and each pair-wire group 3 contains two parallel conductors 1, and the outer surface of each conductor 1 is tightly wrapped with an insulating layer 2, and a sub-shielding braided layer 5 is additionally arranged on the outer side of the insulating layer 2 of the three-wire group 4 to provide a first-level electromagnetic shielding, and a total shielding braided layer 6 is commonly wrapped on the outer side of a three-wire group 4 and three pair-wire groups 3 as a second-level electromagnetic shielding; the outer side of the total shielding braided layer 6 is further covered with a tape layer 7 to enhance the stability and protection performance of the cable structure; the outermost layer of the tape layer 7 is provided with a sheath layer 8 to provide ultimate physical protection and environmental adaptability.

[0030] The cable is mainly composed of nine conductors 1, which are grouped to form a three-wire group 4 and three pair groups 3. In the three-wire group 4, three conductors 1 are arranged side by side for transmitting power or signals that may require higher current or more complex signal control, and in each pair group 3, there are two conductors 1 arranged side by side, which are usually used to transmit differential signals or signals that require lower current transmission. The outer surface of each conductor 1 is tightly wrapped with an insulating layer 2, which plays a role of electrical isolation, ensuring the electrical safety between the conductors 1 and preventing the occurrence of current leakage or short circuit. The material and thickness of layer 2 are strictly selected and controlled to ensure that it has good insulation performance and heat resistance. In order to further improve the electromagnetic shielding effect of the cable, the present invention additionally sets a sub-shielding braided layer 5 on the outside of the insulating layer 2 of the three-wire group 4. This sub-shielding braided layer 5 is woven with a highly conductive material, which can effectively block the electromagnetic interference from the inside of the cable and provide the first level of electromagnetic shielding for the cable. In addition, the outside of a three-wire group 4 and three pairs of wires 3 are also wrapped with a total shielding braided layer 6 as a second level of electromagnetic shielding. This total shielding braided layer 6 is also made of a highly conductive material. The present invention is woven from a material, and its weaving density may be higher than that of the sub-shielding braided layer 5 to provide a stronger electromagnetic shielding effect. Through the design of these two levels of electromagnetic shielding, the present invention can ensure that the cable can still maintain the purity and stability of signal transmission when facing a high-intensity, complex and changeable electromagnetic environment. In order to enhance the stability and protection performance of the cable structure, the present invention further covers the outer side of the total shielding braided layer 6 with a layer of wrapping layer 7. This wrapping layer 7 is made of special materials, has good mechanical strength and wear resistance, and can effectively protect the cable from external mechanical damage. Finally, the wrapping layer 7 A sheath layer 8 is also provided at the outermost layer. The sheath layer 8 is made of highly flame-retardant and environmentally aging-resistant materials, which can provide ultimate physical protection and environmental adaptability for the cable. Whether in high temperature, humid or corrosive environment, the sheath layer 8 can ensure the normal operation and service life of the cable. In summary, the double-specification double-shielded control flexible cable for transformer equipment of the present invention achieves improved current carrying capacity and signal transmission flexibility, enhanced electromagnetic shielding effect, and improved stability of the cable structure and protection performance through its unique design and construction, thereby meeting the high requirements of transformer equipment for control cables.

[0031] A method for manufacturing a double-specification double-shielded control soft cable for transformer equipment comprises the following steps:

[0032] S10. Prepare conductor 1. Conductor 1 adopts a double-specification structure and conforms to the sixth type of bare copper conductor in GB / T3956 standard. The diameter of a single wire does not exceed 0.15 mm. It is formed by a regular stranding process of soft copper wire, and the stranding direction is all right-handed.

[0033] S20, forming an insulating layer 2 by extrusion molding on the outer surface of the conductor 1, wherein the insulating layer 2 is made of polyvinyl chloride material, the temperature resistance grade is 70°C, the thinnest point of the insulating layer is not less than 90% of the nominal thickness, and the out-of-roundness is not greater than 10%;

[0034] S30, dividing the conductor 1 into a three-wire group 4 and three pair-wire groups 3, wherein the three-wire group 4 includes three parallel conductors 1, and each pair-wire group 3 includes two parallel conductors 1, and each wire group is twisted or twisted, and then wrapped with a polyester tape;

[0035] S40, weaving a shielding braided layer 5 outside the insulating layer 2 of the three-wire group 4, using a braided wire with a single wire diameter of 0.12 mm and a braiding density greater than 85%;

[0036] S50, three pairs of wires 3 and one three-wire group 4 are twisted into a cable by a cabling machine, the pitch of the cable is not more than 16 times, and low-smoke zero-halogen filling rope is added inside the cable, and polyester tape is wrapped outside;

[0037] S60, weaving a total shielding braided layer 6 on the outside of the cable, using a braided wire with a single wire diameter of 0.15 mm and a braiding density greater than 90%;

[0038] S70, a tape layer 7 is provided outside the general shielding braided layer 6, and a low-smoke halogen-free flame-retardant tape is used;

[0039] S80. A sheath layer 8 is provided outside the tape layer 7 and is made of highly flame-retardant polyvinyl chloride material to meet the flame-retardant test requirements of the cable.

[0040] In step S10, conductors 1 are prepared. These conductors 1 adopt a double-specification structure and strictly follow the sixth bare copper conductor specification in the GB / T3956 standard to ensure that the single wire diameter of each conductor does not exceed 0.15 mm. By adopting a regular twisting process for soft copper wire and unifying the twisting direction of all conductors to the right, it is ensured that the conductors 1 not only have good electrical conductivity but also have sufficient mechanical strength and flexibility, providing a solid foundation for subsequent processing and long-term use of the cable. Then, in step S20, an insulating layer 2 is extruded on the outer surface of each conductor 1. This insulating layer 2 is made of polyvinyl chloride material, which has excellent electrical insulation performance and heat resistance. Its temperature resistance level is as high as 70°C. During the extrusion process, the thickness and out-of-roundness of the insulating layer are strictly controlled to ensure that the thinnest point of the insulating layer is not less than 90% of the nominal thickness and the out-of-roundness is not greater than 10%, thereby ensuring the uniformity and reliability of the insulating layer. Then, in step S30, the conductor 1 is divided into a three-wire group 4 and three pairs of wire groups 3 according to a specific combination. The three-wire group 4 includes three conductors 1 arranged side by side, which are used to transmit signals that may require higher current or more complex signal control. Power or signal, and the pair group 3 includes two conductors 1 arranged side by side, which are usually used to transmit differential signals or signals that require lower current transmission. Each wire group is twisted or twisted, and wrapped with polyester tape to enhance the stability and anti-interference ability of the wire group. In step S40, special attention is paid to the electromagnetic shielding effect of the three-wire group 4. On the outside of the insulating layer 2 of the three-wire group 4, a sub-shielding braided layer 5 is woven. This sub-shielding braided layer 5 uses a braided wire with a single wire diameter of 0.12mm and a braiding density greater than 85%, which can effectively block electromagnetic interference from inside the cable. , providing the first level of electromagnetic shielding for the cable. Next, in step S50, three pairs of wires 3 and one set of three wires 4 are twisted into cables by a cabling machine. During the twisting process, the cable pitch is strictly controlled to ensure that it is no more than 16 times to optimize the structural stability and electrical performance of the cable. At the same time, low-smoke halogen-free filling rope is added inside the cable and polyester tape is wrapped outside to further enhance the mechanical strength and wear resistance of the cable. Then, in step S60, a total shielding braided layer 6 is woven on the outside of the cable. This total shielding braided layer 6 adopts a single wire diameter of 0.The 15mm braided wire has a braiding density greater than 90%, which provides a second-level electromagnetic shielding for the cable. Through the design of these two levels of electromagnetic shielding, it is ensured that the cable can still maintain the purity and stability of signal transmission when facing a high-intensity, complex and changeable electromagnetic environment. In step S70, a layer of tape layer 7 is set on the outside of the total shielding braided layer 6. This tape layer 7 uses low-smoke halogen-free flame-retardant tape, has good flame retardant properties and mechanical strength, and can effectively protect the cable from external flames and mechanical damage. Finally, in step S80, a sheath layer 8 is set on the outside of the tape layer 7. This sheath layer 8 is made of highly flame-retardant polyvinyl chloride material and has excellent flame retardant properties and environmental aging resistance. Through the setting of this sheath layer 8, it is ensured that the cable can not only work stably for a long time in a normal environment, but also maintain a certain degree of safety and reliability in extreme situations such as fire. .

[0041] In a preferred embodiment of the present invention, the insulating layer 2 can be further configured as follows: the insulating layer 2 is extruded by an extruder, and an anti-aging agent is added to the polyvinyl chloride material of the insulating layer 2. In the process of manufacturing a double-specification double-shielded control soft cable for a transformer device of the present invention, the preparation of the insulating layer 2 is a crucial link, which has excellent electrical insulation performance and good aging resistance. An extrusion molding method is adopted. During the extrusion process, an anti-aging agent is specially added to the polyvinyl chloride material of the insulating layer 2. Specifically, the polyvinyl chloride material of the insulating layer 2 enters the screw extrusion zone through the hopper of the extruder. Under the rotation and shearing action of the screw, the material is heated, melted and extruded. In this process, the anti-aging agent is evenly dispersed in the polyvinyl chloride material and is shaped like The addition of anti-aging agent can effectively inhibit the oxidative degradation of polyvinyl chloride materials during long-term use, thereby extending the service life of the insulating layer 2 and maintaining the stability of its electrical and physical properties. The extruded insulating layer 2 is tightly wrapped on the outer surface of each conductor 1 to form a uniform insulating barrier. This insulating layer 2 not only has excellent electrical insulation performance, can prevent electrical short circuit and current leakage between conductors 1, but also has good aging resistance, and can maintain its performance stability for a long time in various harsh environments. Therefore, by adopting the method of extrusion molding by an extruder and adding an anti-aging agent to the polyvinyl chloride material, an insulating layer 2 with excellent electrical properties and aging resistance is successfully prepared, which provides a strong guarantee for the overall performance of the cable.

[0042] In a preferred embodiment, the present invention can be further configured as follows: after the three-wire group 4 and each pair of wire groups 3 are twisted or twisted, they are wrapped with a layer of polyester tape. The two side-by-side conductors 1 of the pair of wire groups 3 are twisted with unequal pitches, and the three side-by-side conductors 1 of the three-wire group 4 are twisted in reverse. The twisting and twisting of the wire groups and the subsequent wrapping are key steps to ensure the performance of the cable. First, the conductors 1 are divided into a three-wire group 4 and three pair of wire groups 3 according to a specific combination. After the twisting or twisting of these wire groups is completed, in order to ensure the stability of the wire groups and reduce electromagnetic interference, a layer of polyester tape is wrapped. For each pair of wire groups 3, the two side-by-side conductors 1 contained therein are twisted with unequal pitches. This twisting method not only enhances the electrical connection between the conductors 1, but also effectively reduces electromagnetic interference and signal attenuation through the design of different pitches, thereby improving the purity and stability of signal transmission. At the same time, The design of unequal pitch also enables the wire group 3 to better disperse stress when facing external mechanical stress, thereby improving the mechanical strength and durability of the cable. As for the three-wire group 4, the three parallel conductors 1 it contains are reverse twisted. This twisting method ensures the electrical balance between the conductors 1, and the torque generated by the reverse twisting enhances the overall stability and anti-twisting ability of the wire group. The reverse twisting method also helps to reduce electromagnetic interference between the conductors 1, especially when transmitting high-frequency signals, it can significantly reduce signal distortion and attenuation. After twisting or pair twisting is completed, a layer of polyester tape is wrapped around the surface of the wire group. This layer of polyester tape not only fixes the structure of the wire group, but also further enhances the stability and protection performance of the wire group through its good insulation and wear resistance. At the same time, the wrapping of the polyester tape also provides a good base for the subsequent braided shielding layer, ensuring a close bond between the shielding layer and the wire group.

[0043] In a preferred embodiment of the present invention, the braiding density of the sub-shielding braided layer 5 and the total shielding braided layer 6 is greater than 85% and 90% respectively. The sub-shielding braided layer 5 and the total shielding braided layer 6 are both woven with tinned copper wire. The design of the shielding layer is the key to ensuring the electromagnetic compatibility and signal transmission quality of the cable. In order to meet this requirement, the sub-shielding braided layer 5 and the total shielding braided layer 6 are specially designed, and their braiding density and material selection are strictly controlled. The sub-shielding braided layer 5 is tightly woven on the outside of the insulating layer 2 of the three-wire group 4. This shielding layer is woven with tinned copper wire, and its braiding density is greater than 85%. The tinned copper wire not only has good electrical conductivity, but also enhances its corrosion resistance and oxidation resistance through tinning, thereby ensuring the long-term stability and reliability of the shielding layer. The high braiding density effectively blocks the The electromagnetic interference of the whole cable is prevented, which provides the first level of electromagnetic shielding for the cable. Secondly, the total shielding braided layer 6 is woven on the outside of the cable, and is also woven with tinned copper wire, but its braiding density is higher, greater than 90%. This design further enhances the electromagnetic shielding capability of the cable, effectively blocks the electromagnetic interference from the external environment, and ensures the stable operation of the cable in a complex electromagnetic environment. At the same time, the total shielding braided layer 6 with high braiding density also improves the mechanical strength and wear resistance of the cable, providing a strong guarantee for the long-term operation of the cable. The high-density shielding layer design woven with tinned copper wire has successfully improved the electromagnetic compatibility and signal transmission quality of the cable. The tight weaving of the sub-shielding braided layer 5 and the total shielding braided layer 6 not only effectively blocks electromagnetic interference, but also ensures the long-term stability and reliability of the shielding layer through the excellent performance of the tinned copper wire.

[0044] In a preferred embodiment of the present invention, the sheath layer 8 can be further configured as follows: the sheath layer 8 is made of a highly flame-retardant polyvinyl chloride material with an oxygen index of not less than 38, the low-smoke halogen-free flame-retardant tape of the tape layer 7 is also added with an anti-ultraviolet agent, and the highly flame-retardant polyvinyl chloride material of the sheath layer 8 is also added with an anti-wear agent. The outer layer protection design is the key to ensuring the long-term stable operation of the cable in various harsh environments. In order to meet this demand, special attention is paid to the material selection of the sheath layer 8 and the tape layer 7 and their performance optimization. First of all, the sheath layer 8, as the outermost layer of the cable, is directly exposed to various environments, so the selection of its material is very important. The highly flame-retardant polyvinyl chloride material with an oxygen index of not less than 38 is used to prepare the sheath layer 8. The highly flame-retardant polyvinyl chloride material not only has excellent flame-retardant properties, but can also effectively prevent the spread of fire in extreme cases such as fire, and protect the electrical inside the cable. The gas components are not damaged and have good electrical insulation properties and environmental aging resistance. In addition, wear-resistant agents are added to the highly flame-retardant polyvinyl chloride material to further improve the wear resistance and scratch resistance of the sheath layer 8, thereby extending the service life of the cable. Secondly, the tape layer 7, as a transition layer between the sheath layer 8 and the overall shielding braided layer 6, also plays an important protective role. Low-smoke halogen-free flame-retardant tape is adopted, and anti-ultraviolet agents are added therein. The low-smoke halogen-free flame-retardant tape not only has excellent flame retardant properties, but also can produce very little smoke and toxic gases when burned, which meets the requirements of modern fire safety. The addition of anti-ultraviolet agents effectively improves the anti-ultraviolet aging ability of the tape layer 7, prevents material aging, cracking and other problems caused by long-term exposure to outdoor environments, and ensures the long-term stability and reliability of the cable.

[0045] In a preferred embodiment, the present invention can be further configured as follows: the dual-specification structure of the conductor 1 includes a thicker specification and a thinner specification, the thicker specification conductor is used for the three-wire group 4, and the thinner specification conductor is used for the pair group 3, so as to optimize the transmission performance and mechanical strength of the cable. The dual-specification structural design of the conductor 1 is the key to improving the performance of the cable. Two different specifications of conductors 1 are used: one is a thicker specification and the other is a thinner specification. The two specifications of conductors 1 are cleverly distributed in different wire groups of the cable to give full play to their respective advantages. For the three-wire group 4, a thicker specification conductor 1 is selected. This design is mainly to optimize the transmission performance of the cable. The thicker conductor 1 has a lower resistance, can transmit current and signals more effectively, reduce energy loss, and improve transmission efficiency. When the cable is connected to the pair group 3, the thicker conductor 1 can also provide better mechanical support, enhance the overall structural strength of the three-wire group 4, and make it more stable and reliable when dealing with external mechanical stress. For the pair group 3, a thinner conductor 1 is used. This design is mainly to optimize its transmission performance and cost-effectiveness while maintaining the overall flexibility and flexibility of the cable. Although the thinner conductor 1 has a slightly higher resistance, in the pair group 3, since the signal transmission distance is relatively short and the differential signal is mainly transmitted, the impact of resistance is relatively small. At the same time, the thinner conductor 1 makes the pair group 3 more compact, which helps to reduce the overall diameter and weight of the cable and improve the flexibility and installation convenience of the cable. In addition, the use of a thinner conductor 1 can also reduce the manufacturing cost of the cable to a certain extent and improve the cost performance.

[0046] In a preferred embodiment, the present invention can be further configured as follows: the manufacturing process also includes multiple quality inspection steps, such as conductor resistance test, insulation resistance test, shielding effect test and flame retardant performance test, etc., to ensure that the quality of the cable meets the relevant standards and requirements. Quality inspection is a key link to ensure that the cable performance meets the standards and meets the relevant standards and requirements. In order to comprehensively evaluate the quality of the cable, a series of strict quality inspection steps are designed and implemented, covering multiple aspects such as conductor resistance test, insulation resistance test, shielding effect test and flame retardant performance test. First, after the conductor 1 is manufactured, a conductor resistance test is performed. This step measures the resistance value of the conductor 1 to evaluate its conductive performance and current transmission capacity. The test result of the conductor resistance is one of the important indicators for measuring the transmission efficiency of the cable, ensuring that it meets the relevant standards and requirements to ensure the stability and reliability of the cable when transmitting current and signals. Secondly, after the insulation layer 2 is manufactured, an insulation resistance test is performed. The insulation resistance test is a key step in evaluating the electrical isolation performance of the insulation layer 2. By measuring the resistance value on the insulation layer 2, it can be determined whether it can effectively prevent current leakage and electrical short circuit, ensuring that the test result of the insulation resistance meets the relevant standards and requirements to ensure that the cable is stable and reliable in the long term. Safety and stability during operation. Next, a shielding effect test was conducted. This step mainly evaluates the shielding ability of the sub-shielding braided layer 5 and the total shielding braided layer 6 against electromagnetic interference. By measuring the changes in the electromagnetic field strength inside and outside the shielding layer, it can be determined whether the shielding layer can effectively block external electromagnetic interference and protect the purity and stability of the signal transmission inside the cable. It is ensured that the test results of the shielding effect meet the relevant standards and requirements to ensure the performance of the cable in a complex electromagnetic environment. Finally, a flame retardant performance test was conducted. This step mainly evaluates the flame retardant properties of the sheath layer 8 and the tape layer 7. By simulating extreme conditions such as fire, the burning behavior and fire spread of the cable are observed to ensure that the test results of the flame retardant performance meet the relevant standards and requirements to ensure that the cable can maintain a certain structural integrity and electrical insulation performance in emergency situations such as fire, providing valuable time for personnel evacuation and fire rescue. In summary, by implementing a series of quality inspection steps such as conductor resistance test, insulation resistance test, shielding effect test and flame retardant performance test, it is ensured that the quality of the cable meets the relevant standards and requirements. These quality inspection steps not only improve the reliability and safety of the cable, but also provide a strong guarantee for the stable operation of the cable in various application scenarios.

[0047] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0048] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A double-specification double-shielded control soft cable for transformer equipment, characterized in that: The invention comprises nine conductors (1), wherein the nine conductors (1) are divided into a triad (4) and three pairs of wires (3); the triad (4) contains three conductors (1) arranged side by side, and each pair of wires (3) contains two conductors (1) arranged side by side; the outer surface of each conductor (1) is tightly wrapped with an insulating layer (2); a sub-shielding braided layer (5) is additionally arranged outside the insulating layer (2) of the triad (4) for providing a first-level electromagnetic shielding; the outer sides of the triad (4) and the three pairs of wires (3) are jointly wrapped with a general shielding braided layer (6) for a second-level electromagnetic shielding; the outer side of the general shielding braided layer (6) is further covered with a tape layer (7) to enhance the stability and protection performance of the cable structure; and the outermost layer of the tape layer (7) is provided with a sheath layer (8) to provide ultimate physical protection and environmental adaptability.

2. A method for manufacturing a double-specification double-shielded control flexible cable for transformer equipment as described in 1, characterized in that: The following steps are involved: S10, prepare a conductor (1), wherein the conductor (1) adopts a double-specification structure, conforms to the sixth type of bare copper conductor in GB / T3956 standard, has a single wire diameter not exceeding 0.15 mm, and is formed by a regular twisting process of soft copper wire, and the twisting direction is all right; S20, forming an insulating layer (2) by extrusion molding on the outer surface of the conductor (1), wherein the insulating layer (2) is made of polyvinyl chloride material, has a temperature resistance grade of 70° C., has a thinnest point of not less than 90% of the nominal thickness, and has an out-of-roundness of not more than 10%; S30, dividing the conductor (1) into a three-wire group (4) and three pair-wire groups (3), wherein the three-wire group (4) comprises three parallel conductors (1), and each pair-wire group (3) comprises two parallel conductors (1), and each pair-wire group is twisted or stranded, and then wrapped with a polyester tape; S40, weaving a shielding braided layer (5) outside the insulating layer (2) of the three-wire group (4), using a braided wire with a single wire diameter of 0.12 mm and a braiding density greater than 85%; S50, twisting three pairs of wires (3) and one three-wire group (4) into a cable by a cabling machine, wherein the pitch of the cable is not greater than 16 times, and adding low-smoke zero-halogen filling rope inside the cable, and wrapping the outside with polyester tape; S60, weaving a general shielding braided layer (6) on the outer side of the cable, using a braided wire with a single wire diameter of 0.15 mm and a braiding density greater than 90%; S70, providing a tape layer (7) on the outside of the overall shielding braided layer (6), using a low-smoke, halogen-free, flame-retardant tape; S80. A sheath layer (8) is arranged outside the tape layer (7) and is made of highly flame-retardant polyvinyl chloride material to meet the flame-retardant test requirements of the cable.

3. The manufacturing method of a double-specification double-shielded control flexible cable for transformer equipment according to claim 2, characterized in that: The insulating layer (2) is extruded by an extruder, and an anti-aging agent is also added to the polyvinyl chloride material of the insulating layer (2).

4. The method for manufacturing a double-specification double-shielded control flexible cable for transformer equipment according to claim 2, characterized in that: The three-wire group (4) and each pair of wires (3) are wrapped with a layer of polyester tape after twisting or pair twisting. The two parallel conductors (1) of the pair of wires (3) are twisted in pairs with unequal pitches, and the three parallel conductors (1) of the three-wire group (4) are twisted in reverse.

5. The method for manufacturing a double-specification double-shielded control flexible cable for transformer equipment according to claim 2, characterized in that: The braiding density of the sub-shielding braided layer (5) and the overall shielding braided layer (6) are respectively greater than 85% and 90%, and the sub-shielding braided layer (5) and the overall shielding braided layer (6) are both braided with tinned copper wires.

6. The method for manufacturing a double-specification double-shielded control flexible cable for transformer equipment according to claim 2, characterized in that: The sheath layer (8) is made of a highly flame-retardant polyvinyl chloride material with an oxygen index of not less than 38, the low-smoke, halogen-free flame-retardant tape of the tape layer (7) is also added with an anti-ultraviolet agent, and the highly flame-retardant polyvinyl chloride material of the sheath layer (8) is also added with an anti-wear agent.

7. The method for manufacturing a double-specification double-shielded control flexible cable for transformer equipment according to claim 2, characterized in that: The double-gauge structure of the conductor (1) includes a thicker gauge and a thinner gauge, wherein the thicker gauge conductor is used for the three-wire group (4) and the thinner gauge conductor is used for the pair group (3), so as to optimize the transmission performance and mechanical strength of the cable.

8. A method for manufacturing a double-specification double-shielded control flexible cable for transformer equipment according to any one of claims 2 to 7, characterized in that: The manufacturing process also includes multiple quality inspection steps, including conductor resistance test, insulation resistance test, shielding effect test and flame retardant performance test, to ensure that the quality of the cable meets the relevant standards and requirements.

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