Double-specification double-shielding control flexible cable for transformation equipment

Abstract

The utility model 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 divided into a three-wire group and three paired wire groups, the three-wire group comprises three conductors arranged side by side, each paired wire group comprises two conductors arranged side by side, and the nine conductors are arranged in the three-wire group. 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. 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 utility model relates to cable electric wire technical field, concretely is a double specification double shielding control flexible cable for transformer equipment. BACKGROUND

[0002] With the vigorous development of electric power industry and mechanical manufacturing industry, transformer equipment plays a pivotal role in modern society, and they are widely used in power system, industrial production, transportation and various public facilities, and become indispensable infrastructure supporting social operation, transformer equipment ensures the efficiency and safety of power transmission from power station to user end through accurate voltage regulation, in power system, they can effectively reduce power loss and improve energy utilization efficiency, in industrial production field, stable voltage supply provides reliable power guarantee for various precision equipment, in transportation, whether high-speed rail or electric vehicle, cannot do without the stable support of transformer equipment, and in public facilities, transformer equipment guarantees the smooth operation of city lighting, water supply, communication and other systems.

[0003] However, the control cable on the current market generally has certain technical limitations, mainly reflected in the single specification, single shielding structure, this design can meet the basic power transmission and control requirements to a certain extent, but when facing the increasingly complex and diversified application scenarios inside transformer equipment, it is not enough, the single specification conductor design makes the cable lack flexibility in carrying current and signal transmission, and cannot accurately match the specific requirements of different application scenarios, thereby limiting the full play of the performance of transformer equipment, at the same time, although the single shielding structure can provide certain electromagnetic interference shielding effect, when facing high strength, complex and changeable electromagnetic environment, its shielding efficiency is often insufficient, and it is difficult to ensure the purity and stability of signal transmission, in addition, with the development of intelligent and miniaturization of transformer equipment, higher requirements are put forward for the softness, wear resistance, flame retardant performance and environmental adaptability of control cable, and the traditional single specification, single shielding structure control cable is often difficult to achieve the ideal state in these aspects, thereby affecting the overall performance and reliability of transformer equipment. UTILITY MODEL CONTENTS

[0004] The utility model aims at solving the problems of insufficient current carrying and signal transmission flexibility, limited electromagnetic shielding effect, poor softness, wear resistance, flame retardant performance and environmental adaptability caused by single specification and single shielding structure of the current control cable for transformer equipment, and provides a double specification double shielding control flexible cable for transformer equipment.

[0005] The technical scheme for solving the above technical problems of the utility model is as follows:

[0006] A double-specification double-shield control flexible cable for voltage transformation equipment comprises:

[0007] Nine conductors are divided into one three-wire group and three pair-wire groups, the three-wire group contains three side-by-side conductors, each pair-wire group contains two side-by-side conductors, and the outer surface of each conductor is tightly wrapped with an insulation layer;

[0008] An additional split-shield braiding layer is arranged outside the insulation layer of the three-wire group to provide a first-stage electromagnetic shield;

[0009] A total shield braiding layer is wrapped outside one three-wire group and three pair-wire groups as a second-stage electromagnetic shield;

[0010] The outer side of the total shield braiding layer is further covered with a tape layer to enhance the stability and protection performance of the cable structure;

[0011] The outermost layer of the tape layer is provided with a sheath layer to provide final physical protection and environmental adaptability;

[0012] The conductors adopt a double-specification structure, including a thicker specification and a thinner specification, wherein the thicker specification conductors are used for the three-wire group, and the thinner specification conductors are used for the pair-wire groups.

[0013] On the basis of the above technical solution, the utility model further can make improvement as follows.

[0014] Furthermore, the conductors meet the sixth bare copper conductor in GB / T3956 standard, and the monofilament diameter is not more than 0.15mm.

[0015] Furthermore, the insulation layer adopts polyvinyl chloride material, the temperature resistance grade is 70 DEG C, the thinnest point of the insulation layer is not less than 90% of the nominal thickness, and the non-circularity is not more than 10%.

[0016] Furthermore, the three-wire group and the pair-wire group are twisted or twisted and then wrapped with polyester tape.

[0017] Furthermore, the split-shield braiding layer adopts braiding wire with a monofilament diameter of 0.12mm, and the braiding density is greater than 85%.

[0018] Furthermore, the total shield braiding layer adopts braiding wire with a monofilament diameter of 0.15mm, and the braiding density is greater than 90%.

[0019] Furthermore, the split-shield braiding layer and the total shield braiding layer are both made of tinned copper wire braiding.

[0020] Furthermore, the sheath layer is made of high-flame-retardant polyvinyl chloride material to meet the flame-retardant test requirements of the cable, and the oxygen index is not less than 38.

[0021] Compared with the prior art, the technical scheme of the present application has the following beneficial technical effects:

[0022] The cable adopts a double-specification conductor structure, specifically, nine conductors are divided into one three-wire group and three pairs of wire groups, wherein the three-wire group adopts a thicker specification conductor for carrying larger current and transmitting important signals, and the pairs of wire groups adopt a thinner specification conductor for transmitting auxiliary signals or control signals, this design enables the cable to be accurately matched according to the specific needs of different application scenarios, ensuring the stability and efficiency of current transmission, and improving the flexibility and accuracy of signal transmission, thereby fully exerting the performance of the transformer equipment, secondly, in view of the problem of insufficient shielding effectiveness of the single shielding structure in a complex electromagnetic environment, the cable adopts a double shielding structure, an additional shielding braid layer is additionally arranged outside the insulating layer of the three-wire group to provide a first level of electromagnetic shielding, at the same time, the outside of the one three-wire group and the three pairs of wire groups is collectively wrapped with a total shielding braid layer as a second level of electromagnetic shielding, this double shielding structure can effectively resist high-strength and complex electromagnetic interference, ensuring the purity and stability of signal transmission, and improving the anti-interference ability of the cable, in addition, the cable also focuses on the stability and protection performance of the overall structure, further covers a tape layer outside the total shielding braid layer to enhance the stability and mechanical strength of the cable structure, preventing the cable from being damaged due to excessive stress during use, at the same time, the outermost layer of the tape layer is provided with a sheath layer made of high-flame-retardant polyvinyl chloride material to provide the final physical protection and environmental adaptability, this design not only improves the wear resistance, flame retardance and anti-aging performance of the cable, but also enhances the adaptability of the cable to environmental changes, ensuring the reliable operation of the cable in various harsh environments. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a structural schematic view of the double-specification double-shielding control flexible cable for transformer equipment.

[0024] In the figure: 1, conductor; 2, insulating layer; 3, pair of wire groups; 4, three-wire group; 5, shielding braid layer; 6, total shielding braid layer; 7, tape layer; 8, sheath layer. DETAILED DESCRIPTION

[0025] The technical scheme in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0026] In combination with Figure 1The utility model discloses a double-specification double-shielding control flexible cable for voltage transformation equipment, comprising

[0027] Nine conductors 1 are divided into a three-wire group 4 and three pairs of wire groups 3, the three-wire group 4 contains three side-by-side conductors 1, each pair of wire groups 3 contains two side-by-side conductors 1, and the outer surface of each conductor 1 is tightly wrapped with an insulating layer 2;

[0028] The outer side of the insulating layer 2 of the three-wire group 4 is additionally provided with a split shielding braid 5 for providing a first-stage electromagnetic shielding;

[0029] The outer side of the three-wire group 4 and the three pairs of wire groups 3 are jointly wrapped with a total shielding braid 6 as a second-stage electromagnetic shielding;

[0030] The outer side of the total shielding braid 6 is further covered with a tape layer 7 to enhance the stability and protection performance of the cable structure;

[0031] The outermost layer of the tape layer 7 is provided with a sheath layer 8 to provide final physical protection and environmental adaptability;

[0032] The conductors 1 adopt a double-specification structure, including a thicker specification and a thinner specification, wherein the thicker specification conductors are used for the three-wire group 4, and the thinner specification conductors are used for the pairs of wire groups 3.

[0033] The utility model discloses a further configuration in a preferable embodiment can be: conductor 1 meets the 6th bare copper conductor in GB / T3956 standard, monofilament diameter is no more than 0.15mm, in double specification double shielding control flexible cable for voltage transformation equipment, conductor 1 is transmission medium of current and signal, and the selection of its material and specification is very important, conductor 1 meets the 6th bare copper conductor in GB / T3956 standard, this means that conductor 1 has adopted specific copper material standard and production process, has guaranteed good electric conductivity and mechanical strength, specifically, the monofilament diameter of conductor 1 is no more than 0.15mm, this design has following several aspects of consideration: first, smaller monofilament diameter helps to reduce the resistance of conductor 1, to improve the efficiency of current transmission, in the process of electric power transmission, resistance is one of the main factors leading to energy loss, by reducing the monofilament diameter of conductor, can reduce resistance to some extent, reduce energy loss, improve the efficiency and stability of electric power transmission, second, smaller monofilament diameter can also increase the softness and flexibility of conductor 1, in voltage transformation equipment, due to the limitation of space layout and complex electrical connection demand, cable often needs to be frequently bent and twisted, smaller monofilament diameter makes conductor 1 more easily bent, not easy to break, thereby improves the durability and reliability of cable, in addition, the 6th bare copper conductor in GB / T3956 standard also means that conductor 1 has good oxidation resistance and corrosion resistance, copper material has good electric conductivity and ductility, but long-term exposure in humid, high temperature or corrosive environment, easy oxidation and corrosion, by adopting the bare copper conductor meeting the standard, can effectively prevent the performance decline of conductor 1 due to oxidation and corrosion in the use process, prolongs the service life of cable.

[0034] In a preferred embodiment, the insulating layer 2 is made of polyvinyl chloride material with a temperature resistance rating of 70°C, the thinnest point of the insulating layer is not less than 90% of the nominal thickness, and the roundness is not greater than 10%. In the double-specification double-shielded control flexible cable for voltage transformation equipment, the insulating layer 2 serves as an isolation barrier between the conductor 1 and the external environment, and the selection of its material and performance is crucial to the overall performance and safety of the cable. The insulating layer 2 is made of polyvinyl chloride (PVC) material and has specific temperature resistance rating and geometric size requirements. Specifically, the insulating layer 2 is made of polyvinyl chloride (PVC) material because polyvinyl chloride has good insulation performance, mechanical strength, and chemical corrosion resistance. It can effectively isolate the conductor 1, prevent current leakage and short circuit phenomenon, and ensure the safety and stability of the cable during current and signal transmission. In addition, the temperature resistance rating of the insulating layer 2 is 70°C, which means that the insulating layer 2 can operate stably for a long time in an environment not exceeding 70°C without performance degradation or damage. This feature allows the cable to maintain stable insulation performance under various temperature conditions, ensuring accurate transmission of current and signals. Furthermore, the geometric size requirements of the insulating layer 2 are specified, with the thinnest point of the insulating layer not less than 90% of the nominal thickness, which ensures the uniformity of the thickness of the insulating layer 2 during manufacturing, preventing insulation performance degradation due to insufficient thickness. In addition, the requirement of not greater than 10% roundness ensures the circularity of the insulating layer 2, allowing the cable to maintain uniform insulation effect during bending and twisting, preventing local insulation failure due to irregular shape.

[0035] The utility model discloses a three -line group 4 and the pair line group 3 are carried out special pair of twisting or the twisting processing, and after processing, the polyester tape is wound, in the manufacturing process of double -specification double -shielded control flexible cable for voltage transformation equipment, in order to improve the anti -electromagnetic interference ability of cable and the stability of signal transmission, three -line group 4 and the pair line group 3 have been special pair of twisting or the twisting processing, and after processing, the polyester tape is wound, this design not only enhanced the stability of cable internal structure, also significantly promoted the overall performance of cable, specifically, three -line group 4 contains three side -by -side conductor 1, and the three conductors are closely combined together through the accurate pair of twisting or the twisting process, and this twisted structure can reduce the electromagnetic interference between the conductor, improves the transmission quality of signal, simultaneously, the overall structure of three -line group 4 after twisting is more compact, and the mechanical strength and wear resistance of cable are enhanced, similarly, the pair line group 3 also contains two side -by -side conductor 1, and after the pair of twisting or the twisting processing, is similar to three -line group 4, and the twisted structure of pair line group helps to reduce electromagnetic interference, improves the definition of signal transmission, in addition, the pair line group 3 after twisting is arranged more neatly in the cable, is favorable to keep the overall structural stability and electrical performance consistency of cable, after the twisting processing is completed, the outer surface of three -line group 4 and the pair line group 3 is wound with the polyester tape, and the polyester tape is as a kind of high -performance insulating material, has good insulating property and mechanical strength, it can be closely attached on the conductor group after twisting, forms an additional protective layer, prevents the conductor group from being damaged in subsequent processing or use process, simultaneously, the polyester tape also has certain flame -retardant property, can improve the fire safety of cable to some extent.

[0036] In a preferred embodiment, the split shielding braid layer 5 can be further configured as follows: the braided wire used in the split shielding braid layer 5 has a single wire diameter of 0.12 mm, and the braiding density is greater than 85%. In the structural design of the double-specification double-shielding control flexible cable for voltage transformation equipment, the split shielding braid layer 5 serves as the first-level electromagnetic shielding, and the selection of its material, single wire diameter, and braiding density and other parameters is crucial to the electromagnetic shielding effectiveness of the cable. The split shielding braid layer 5 uses braided wire with a single wire diameter of 0.12 mm, and the braiding density is greater than 85%. This design aims to improve the anti-electromagnetic interference capability of the cable and ensure the purity and stability of signal transmission. Specifically, the split shielding braid layer 5 tightly wraps around the outside of the insulating layer 2 of the three-wire group 4, forming a continuous electromagnetic shielding net. The single wire diameter of the braided wire is selected to be 0.12 mm, which ensures the flexibility and plasticity of the braid layer and also ensures sufficient shielding effectiveness. The thinner braided wire can be arranged more tightly, forming a more dense shielding net, thereby more effectively blocking external electromagnetic field interference. At the same time, the requirement that the braiding density be greater than 85% further enhances the shielding effectiveness of the split shielding braid layer 5. High braiding density means smaller gaps between braided wires, reducing the possibility of electromagnetic field penetration. This design enables the split shielding braid layer 5 to more effectively absorb and reflect external electromagnetic interference, protecting the conductors 1 in the three-wire group 4 from electromagnetic noise. In addition, the tight braiding structure of the split shielding braid layer 5 also improves the mechanical strength and wear resistance of the cable. During the use of the cable, the split shielding braid layer 5 can resist external mechanical stress and wear, protecting the internal insulating layer and conductors from damage.

[0037] The utility model discloses a total shielding braid layer 6 adopts the braid line of 0.15mm monofilament diameter, and the weaving density is greater than 90%, in the structure of double specification double shielding control flexible cable for voltage transformation equipment, total shielding braid layer 6 plays the vital role, it is as second level electromagnetic shield, not only further strengthened the electromagnetic shield efficiency of cable whole, also ensured the stable operation of cable under the complex electromagnetic environment, total shielding braid layer 6 adopted the braid line of 0.15mm monofilament diameter, and the weaving density is greater than 90%, this design aims at the shielding effect of maximum, and gives consideration to the flexibility and durability of cable simultaneously, in particular, total shielding braid layer 6 is tightly wrapped in the outside of a three wire group 4 and three pair wire group 3, formed a layer of continuous electromagnetic shield barrier, the monofilament diameter of braid line selects 0.15mm, this size guarantees the weaving layer enough flexible, also ensured the close arrangement between braid line, thereby improved the shielding efficiency of weaving layer, the thicker braid line can block the interference of external electromagnetic field more effectively, reduces the influence of electromagnetic noise to cable internal signal transmission, in addition, the requirement that the weaving density is greater than 90% further improves the shielding performance of total shielding braid layer 6, high weaving density means that the gap between braid line is greatly reduced, thereby reduces the possibility of electromagnetic field penetration, this design makes total shielding braid layer 6 can absorb, reflect and dissipate external electromagnetic interference more effectively, provides more solid protection for cable internal conductor 1, in addition to the promotion shielding efficiency, the close weaving structure of total shielding braid layer 6 also enhanced the mechanical strength and wear resistance of cable, in the use process of cable, total shielding braid layer 6 can resist external mechanical stress and wear, protect internal insulation layer 2 and conductor 1 from being damaged, prolong the service life of cable.

[0038] The utility model discloses a further configuration in a preferable embodiment can be: the shielding braid 5 and total shielding braid 6 all adopt the weaving of tinned copper wire, in the precision structure of double specification double shielding control flexible cable for voltage transformation equipment, the shielding braid 5 and total shielding braid 6 as the key component of electromagnetic shielding, the selection of its material has the vital influence to the shielding effectiveness of cable, electric property and durability, the shielding braid 5 and total shielding braid 6 all adopt the weaving of tinned copper wire, this design not only has promoted the electromagnetic shielding capacity of cable, also strengthened its electric property and corrosion resistance, specifically, tinned copper wire as a kind of high-performance conductive material, has excellent electric property and corrosion resistance, by plating a layer of tin on the surface of copper wire, can further improve the oxidation resistance and wear resistance of copper wire, thereby prolongs the service life of cable, in the shielding braid 5, tinned copper wire is closely woven together, formed a continuous electromagnetic shielding net, effectively blocked the interference of external electromagnetic field, protected the inside three wire group 4 from the influence of electromagnetic noise, similarly, in total shielding braid 6, tinned copper wire also plays the key role, as the last electromagnetic shielding barrier of cable, total shielding braid 6 weaves tinned copper wire into more compact structure to provide higher shielding effectiveness, this compact weaving structure not only reduces the possibility of electromagnetic field penetration, also enhances the mechanical strength and wear resistance of cable, so that cable can keep stable performance in the complex electromagnetic environment, in addition, the use of tinned copper wire also improves the electric property of cable, since copper is a kind of excellent conductor, and the addition of tin further enhances its electric property, therefore, the shielding braid 5 and total shielding braid 6 woven by tinned copper wire can ensure the smooth transmission of internal signal of cable while providing electromagnetic shielding.

[0039] In a preferred embodiment, the sheath layer 8 is made of high-flame-retardant polyvinyl chloride material to meet the flame-retardant test requirements of the cable, and the oxygen index is not less than 38. In the overall structure of the double-specification double-shielded control flexible cable for transformer equipment, the sheath layer 8 serves as the outermost protective structure of the cable, and the selection of its material has a crucial impact on the safety, durability, and fireproof performance of the cable. The sheath layer 8 is made of high-flame-retardant polyvinyl chloride material, which is designed to meet the flame-retardant test requirements of the cable and ensure that the cable can maintain certain flame-retardant performance in extreme conditions such as fire, thereby effectively preventing the spread of fire and protecting the safety of surrounding equipment and personnel. Specifically, high-flame-retardant polyvinyl chloride material is a high-molecular material with excellent flame-retardant performance. It can maintain structural stability at high temperatures and is not easily flammable, and it releases less heat and smoke during combustion. This material, through special flame-retardant formulations and process treatment, has an oxygen index not less than 38, meaning that even if the oxygen concentration in the air is as high as 38%, the material will not spontaneously combust without an external fire source. This feature enables the sheath layer 8 to effectively resist external fire sources during the use of the cable and prevent the cable from causing larger fire accidents due to combustion. In addition, high-flame-retardant polyvinyl chloride material also has good mechanical properties and chemical corrosion resistance, enabling it to resist external mechanical stress and chemical erosion, thereby protecting the internal insulation layer 2, the partial shielding braid layer 5, the total shielding braid layer 6, and the conductor 1, among other key components, from damage. The use of this material not only improves the durability of the cable but also ensures that the cable can maintain stable performance in complex and variable environments.

[0040] Firstly, nine conductors 1 are prepared, which are divided into a three-wire group 4 and three pair-wire groups 3, the three-wire group 4 is composed of three thick-gauge conductors 1 arranged side by side, which jointly undertake the main task of current transmission, and each pair-wire group 3 is composed of two thin-gauge conductors 1 arranged side by side, which are used to transmit relatively small current or signal, the outer surface of each conductor 1 is tightly wrapped with an insulating layer 2 to ensure the safety and stability of current transmission, then, an additional split shielding braid layer 5 is arranged outside the insulating layer 2 of the three-wire group 4, which is made of specific braiding technology and material, and can effectively provide the first level of electromagnetic shielding to protect the three-wire group 4 from external electromagnetic interference, then, a three-wire group 4 and three pair-wire groups 3 are arranged in order, and are jointly wrapped with a total shielding braid layer 6 outside, which serves as the second level of electromagnetic shielding, and can further enhance the overall electromagnetic shielding effectiveness of the cable to ensure stable operation of the cable in complex electromagnetic environments, further covered with a tape layer 7 outside the total shielding braid layer 6, which is made of specific material and process, and can enhance the stability and protection performance of the cable structure to prevent damage to the cable during use, finally, a sheath layer 8 is arranged on the outermost layer of the tape layer 7, which is made of high-flame-retardant polyvinyl chloride material, and has excellent physical protection and environmental adaptability, which not only provides the final physical protection to prevent the cable from being eroded by external mechanical stress and chemical substances, but also maintains certain flame-retardant performance in extreme conditions such as fire to effectively prevent the spread of fire, during use, the double-gauge double-shielded control flexible cable for variable voltage equipment can fully play the advantages of its double-gauge structure and double-shielding design to ensure stable transmission of current and signal, while providing excellent electromagnetic shielding and physical protection performance, whether in complex electromagnetic environments or in harsh use conditions, the cable can maintain stable performance, providing reliable electrical connection and signal transmission guarantee for the normal operation of variable voltage equipment.

[0041] It should be noted that, in this text, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including a" does not exclude the presence of additional identical elements in the process, method, article or equipment including the element.

[0042] While the embodiments of the present application have been illustrated and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the present application, which should be limited only by the appended claims and their equivalents.

Claims

1. A dual-gauge dual-shielded control flexible cable for variable pressure equipment, characterized by, The cable comprises: Nine conductors (1) are divided into one three-wire group (4) and three pairs of wire groups (3), the three-wire group (4) contains three parallel conductors (1), each pair of wire group (3) contains two parallel conductors (1), and the outer surface of each conductor (1) is tightly wrapped with an insulation layer (2); An additional partial shielding braid layer (5) is provided outside the insulation layer (2) of the three-wire group (4) to provide a first level of electromagnetic shielding; A total shielding braid layer (6) is wrapped outside the three-wire group (4) and the three pairs of wire groups (3) as a second level of electromagnetic shielding; The outer side of the total shielding braid 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 the final physical protection and environmental adaptability; The conductors (1) adopt a double specification structure, including a thicker specification and a thinner specification, wherein the thicker specification conductors are used for the three-wire group (4), and the thinner specification conductors are used for the pair of wire groups (3).

2. A double gauge double shielded control flexible cable for a power transformation device according to claim 1, characterized in that, The conductors (1) conform to the sixth kind of bare copper conductor in GB / T3956 standard, and the single wire diameter is not more than 0.15mm.

3. A double gauge double shielded control flexible cable for variable voltage apparatus according to claim 1, characterized in that, The insulation layer (2) adopts polyvinyl chloride material, the temperature resistance level is 70℃, the thinnest point of the insulation layer is not less than 90% of the nominal thickness, and the non-circularity is not more than 10%.

4. The double-gauge double-shielded control flexible cable for a power transformation device according to claim 1, characterized by The three-wire group (4) and the pair of wire groups (3) are twisted or twisted and then wrapped with polyester tape.

5. The double-gauge double-shielded control flexible cable for a power transformation device according to claim 1, characterized by The partial shielding braid layer (5) adopts a braided wire with a single wire diameter of 0.12mm, and the braiding density is greater than 85%.

6. A double gauge double shielded control flexible cable for a power transformation equipment as claimed in claim 1, wherein, The total shielding braid layer (6) adopts a braided wire with a single wire diameter of 0.15mm, and the braiding density is greater than 90%.

7. A double gauge double shielded control flexible cable for variable voltage apparatus according to claim 1, wherein, The partial shielding braid layer (5) and the total shielding braid layer (6) are both made of tinned copper wire.

8. A double gauge double shielded control flexible cable for variable voltage apparatus according to claim 1, characterized in that, The sheath layer (8) is made of high flame-retardant polyvinyl chloride material to meet the flame-retardant test requirements of the cable, and the oxygen index is not less than 38.

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