Balanced structure cable for high-altitude power transmission and manufacturing method thereof

Abstract

The application relates to the field of cables, in particular to a balanced structure cable for high-altitude power transmission and a manufacturing method thereof, which comprises a core, an insulation layer, a shielding layer, a waterproof layer, a metal sheath and a balancing layer which are sequentially arranged from inside to outside, the core comprises a copper conductor and is used for transmitting electric energy; the insulation layer comprises powdered magnesium oxide and is used for preventing electric energy leakage or cable short circuit; the shielding layer is used for reducing electromagnetic interference; the waterproof layer is used for preventing moisture from entering the shielding layer; the metal sheath is used for protecting the overall structure of the cable; and the balancing layer is used for improving the balancing capacity of the cable. The pressure buffer zone can disperse the force received by the cable through the expansion and contraction of the spring-shaped structure, meanwhile, the shunt zone disperses the wind force through air pressure, and the above structure improves the balancing capacity of the cable when the cable is affected by external factors, so that the cable can normally work even in severe weather.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of cables, in particular to a balanced structure cable for high-altitude power transmission and a manufacturing method thereof. BACKGROUND

[0002] At present, the application range of cables is very wide, and their shadows can be seen on ships, in factories and on roadside poles. In the field of high-altitude power transmission, cables are also a very important technology.

[0003] A high-altitude cable disclosed by the prior art of CN107086069B includes an oil absorption layer and, from inside to outside, a fireproof layer, a wire core layer, an insulation layer, a first heat-conducting layer, a shielding layer, a waterproof layer and a second heat-conducting layer which are sequentially sleeved outside the oil absorption layer; the oil absorption layer absorbs insulating heat-conducting liquid; the wire core layer includes electric wires which are distributed in a ring shape along a radial cross section of the cable and heat-conducting materials which are filled in the gaps between the electric wires; the electric wire includes a wire core and an insulating rubber layer which is wrapped outside the wire core; the outer circumferential surface of the second heat-conducting layer is uniformly provided with a plurality of long strip-shaped arc surfaces which extend along the length direction of the cable; the plurality of arc surfaces are distributed in a polygon shape on the radial cross section of the cable; the middle part of the radial cross section of the arc surface is concave towards the center of the cable, and the two sides of the middle part of the radial cross section of the arc surface are convex towards the outside of the cable.

[0004] Another typical high-altitude cable disclosed by the prior art of CN113241675A relates to the technical field of high-altitude cable laying. The high-altitude cable includes a cable body, and an auxiliary mechanism is arranged on the outer side of the cable body to assist the installation of the cable body.

[0005] Another typical high-altitude cable disclosed by the prior art of CN105336433A includes an inner core layer and a wire core conductor which is arranged in a ring shape inside the inner core layer; a colored outer shell layer is arranged outside the wire core conductor; a cross-shaped collapse hole is arranged at the axial position of the inner core layer; a first elastic layer is arranged outside the inner core layer; a second elastic layer is arranged outside the first elastic layer; a tensile wire is arranged in a ring shape inside the second elastic layer; a first tensile wire is arranged radially between the first elastic layer and the second elastic layer; an armor layer is arranged outside the second elastic layer; and a second tensile wire is arranged on the outer surface of the armor layer.

[0006] At present, the existing high-altitude cables generally do not consider the balance of the cables in the working process, and the cables with low balance are more likely to be damaged under pressure. In order to solve the problems existing in the field, the present application is made. SUMMARY

[0007] The present application aims at the existing problems and provides a balanced structure cable for high-altitude power transmission and a manufacturing method thereof.

[0008] In order to overcome the deficiencies of the prior art, the present application adopts the following technical solutions:

[0009] A balanced structure cable for high-altitude power transmission and a manufacturing method thereof, comprising a core, an insulation layer, a shielding layer, a waterproof layer, a metal sheath and a balancing layer arranged in sequence from inside to outside, the core comprising a copper conductor, the core being used for transmitting electric energy; the insulation layer comprising powdered magnesium oxide, the particle size of the powdered magnesium oxide being 0.5-1 μm, the insulation layer being used for preventing electric energy leakage or cable short circuit; the shielding layer being composed of a copper foil and a copper wire, the shielding layer being used for reducing electromagnetic interference; the waterproof layer being used for preventing moisture from entering the shielding layer; the metal sheath being used for protecting the overall structure of the cable, the metal sheath being a copper sheath; and the balancing layer being used for improving the balancing capacity of the cable.

[0010] Further, the rated voltage of the cable is 10 kv, the core comprises three copper conductors, the sectional area of each copper conductor being 50 square millimeters, and the distance from the center of the cable to the surface of the metal sheath of the cable is 50 millimeters.

[0011] Further, the balancing layer is made of elastic plastic, the thickness of the balancing layer being 10 millimeters, the balancing layer being composed of a conventional zone and a pressure buffer zone, the length of the conventional zone being 1 m, and the length of the pressure buffer zone being 0.1 m, the pressure buffer zone being used for buffering the pressure generated when the cable is impacted.

[0012] Further, the pressure buffer zone adopts a spring-like structure, the elastic plastic being in the form of strips in the pressure buffer zone, the strip-shaped elastic plastic being spirally wound outside the metal sheath to form the pressure buffer zone, the diameter of the strip-shaped elastic plastic being 0.008 m to 0.01 m, and the gap between each layer of spirals being less than 0.001 m.

[0013] Further, the conventional zone comprises a plurality of flow guiding zones, the flow guiding zones being used for shunting the airflow received by the cable, the flow guiding zones being arranged along the elongation direction of the cable, the arrangement interval of the flow guiding zones being between 0.04 m and 0.06 m, each flow guiding zone comprising four shunt zones, the shunt zones being arranged around the cable, and the interval distance between each shunt zone being the same.

[0014] Further, the manufacturing method of the balanced structure cable comprises the following steps:

[0015] S1, preparing materials required for making each layer of the cable;

[0016] S2, feeding the core into an extrusion machine;

[0017] S3, the extruder extrudes an insulation layer outside the conductor to obtain a first semi-finished cable and cools it;

[0018] S4, the laminating machine laminates the cooled first semi-finished cable, the laminating material is copper foil, and the braider braids copper wires on the laminated first semi-finished cable to form a shielding layer, thereby obtaining a second semi-finished cable;

[0019] S5, the extruder extrudes a waterproof layer, a metal sheath and a balance layer on the second semi-finished cable in sequence to obtain a cable;

[0020] S6, the quality of the cable is inspected.

[0021] Further, the inspection of the quality of the cable includes the following steps:

[0022] S61, a cable sample is obtained from the cable, and the cable sample is divided into a first cable sample, a second cable sample and a third cable sample;

[0023] S62, the first cable sample is placed in a first laboratory, both ends of the first cable sample are clamped, and the input and output of the first cable sample are connected to a first test circuit;

[0024] S63, the second cable sample is placed in a second laboratory, both ends of the second cable sample are clamped, the input and output of the second cable sample are connected to a second test circuit, and the second cable sample is blown in the second laboratory;

[0025] S64, the third cable sample is placed in a third laboratory, both ends of the third cable sample are clamped, the input and output of the third cable sample are connected to a third test circuit, and the third cable sample is sprayed in the third laboratory;

[0026] S65, data generated during the experiment is collected, and a quality index of the cable is calculated;

[0027] S66, it is judged whether the value of the quality index is greater than a set threshold value, if yes, the quality of the cable is unqualified, otherwise, the quality of the cable is qualified.

[0028] Further, the calculation of the quality index of the cable includes the following steps:

[0029] S651, a normal defect index of the first cable sample is calculated according to relevant information;

[0030] S652, a blowing influence index of the second cable sample is calculated according to relevant information;

[0031] S653, a spraying influence index of the second cable sample is calculated according to relevant information;

[0032] S654, the quality index of the cable is calculated according to the following formula:

[0033] ZB = h1 * ZB1 + h2 * ZB2 + h2 * ZB1

[0034] Wherein, ZB is a quality index, h1 is a normal defect weight, h2 is a blowing influence weight, h3 is a water spraying influence weight, ZB1 is a normal defect index, ZB2 is a blowing influence index, and ZB3 is a water spraying influence index.

[0035] The beneficial effects achieved by the present application are: 1. The pressure buffer area can disperse the force received by the cable through the expansion and contraction of the spring-like structure, and at the same time, the shunt area can disperse the wind force through air pressure, which improves the balancing ability of the cable when it is affected by external factors, and ensures normal work even in bad weather.

[0036] 2. By setting a quality index to analyze the quality of the cable, the working performance of the cable itself, whether the cable can maintain normal work when affected by external factors, and the balancing ability of the cable itself when affected by external factors, it is beneficial to quantify the quality of the cable and make further improvements to the cable based on the quality value. BRIEF DESCRIPTION OF DRAWINGS

[0037] The present application can be further understood from the following description in conjunction with the accompanying drawings. The components in the drawings are not necessarily drawn to scale, but emphasis is placed on showing the principles of the embodiments. In different views, the same reference numerals designate the same parts.

[0038] Figure 1 It is a schematic view of the cross-sectional structure of the present application.

[0039] Figure 2 It is a schematic view of the side structure of the present application.

[0040] Figure 3 It is a manufacturing flow chart of the balanced structure cable of the present application.

[0041] Figure 4 It is a flow chart of the present application for testing whether the quality of the cable is qualified.

[0042] Reference numerals: core 01, insulating layer 02, shielding layer 03, waterproof layer 04, metal sheath 05, balancing layer 06, flow guiding area 07, pressure buffer area 08. DETAILED DESCRIPTION

[0043] The following embodiments are illustrative of the present application and do not limit the scope of the application. The present application can be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application 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.

[0044] In one embodiment, the present application provides a balanced structure cable for high-altitude power transmission and a manufacturing method thereof, comprising a core, an insulation layer, a shielding layer, a waterproof layer, a metal sheath and a balancing layer arranged in sequence from inside to outside, wherein the core comprises a copper conductor and is used for transmitting electric energy; the insulation layer comprises powdered magnesium oxide with a particle size of 0.5-1 μm and is used for preventing electric energy leakage or cable short circuit; the shielding layer is composed of a copper foil and a copper wire and is used for reducing electromagnetic interference; the waterproof layer is used for preventing moisture from entering the shielding layer; the metal sheath is used for protecting the overall structure of the cable and is a copper sheath; and the balancing layer is used for improving the balancing capacity of the cable. Figure 1 、 Figure 2 、 Figure 3 and Figure 4 In one embodiment, the present application provides a balanced structure cable for high-altitude power transmission and a manufacturing method thereof, comprising a core, an insulation layer, a shielding layer, a waterproof layer, a metal sheath and a balancing layer arranged in sequence from inside to outside, wherein the core comprises a copper conductor and is used for transmitting electric energy; the insulation layer comprises powdered magnesium oxide with a particle size of 0.5-1 μm and is used for preventing electric energy leakage or cable short circuit; the shielding layer is composed of a copper foil and a copper wire and is used for reducing electromagnetic interference; the waterproof layer is used for preventing moisture from entering the shielding layer; the metal sheath is used for protecting the overall structure of the cable and is a copper sheath; and the balancing layer is used for improving the balancing capacity of the cable.

[0045] In one embodiment, the waterproof layer is prepared from petroleum resin, p-phenylenediamine, elastic fiber, sodium hydroxide, potassium chloride, sodium fluoride, silicone-acrylate emulsion, potassium nitrate, cyclohexanone, acrylic resin, asbestos wool, chlorobenzene, neoprene, diphenyl ether and methyl ethyl ketone.

[0046] In one embodiment, the waterproof layer is prepared from petroleum resin, p-phenylenediamine, elastic fiber, sodium hydroxide, potassium chloride, sodium fluoride, silicone-acrylate emulsion, potassium nitrate, cyclohexanone, acrylic resin, asbestos wool, chlorobenzene, neoprene, diphenyl ether and methyl ethyl ketone.

[0047] In one embodiment, the cable has a rated voltage of 10 kV, the core comprises three copper conductors each having a cross-sectional area of 50 mm2, and the distance from the center of the cable to the surface of the metal sheath of the cable is 50 mm.

[0048] Further, the balancing layer is made of elastic plastic, the thickness of the balancing layer is 10mm, the balancing layer is composed of normal area and pressure buffer area, the length of the normal area is 1m, the length of the pressure buffer area is 0.1m, the pressure buffer area is used for buffering the pressure generated when the cable is impacted.

[0049] Specifically, the elastic plastic is a composite material composed of polyurethane and polypropylene, and the preparation of the elastic plastic is prior art and will not be described here.

[0050] Further, the pressure buffer area adopts a spring-like structure, and the elastic plastic exists in the form of strips in the pressure buffer area. The strip-shaped elastic plastic is spirally wound outside the metal sheath to form the pressure buffer area. The diameter of the strip-shaped elastic plastic is 0.008m to 0.01m, and the gap between each layer of spirals is less than 0.001m.

[0051] Specifically, by providing the pressure buffer area, the influence of the cable when subjected to external interference can be reduced. The pressure buffer area can disperse the force received by the cable through the expansion and contraction of the spring-like structure, so that the cable can maintain a relatively balanced state when subjected to a larger external force and is not easily damaged.

[0052] Further, the normal area includes a plurality of flow guide areas, the flow guide areas are used for shunting the airflow received by the cable, the flow guide areas are arranged along the elongation direction of the cable, the arrangement interval of the flow guide areas is between 0.04m and 0.06m, each flow guide area includes 4 shunt areas, the shunt areas are arranged around the cable, and the interval distance between each shunt area is the same.

[0053] Specifically, the shunt area is as shown in Figure 1 and Figure 2 , Figure 1 is a schematic view of the cross-sectional structure of the cable, Figure Two is a schematic view of the side structure of the cable, the length of the shunt area is 8 1 of the outer circumference of the balancing layer, the width is 10mm, and the depth is 5mm. By providing the shunt area, the wind force received by the cable can be shunted. When the cable is blown by strong wind, the shunt area at the windward position will receive the main wind force, and the air pressure of the shunt area is relatively high. The shunt areas at other positions are concave downward relative to the cable due to their shape, and the air pressure at the concave downward position is relatively low. The airflow tends to flow to the position with low air pressure. Compared with ordinary cables, the shunting speed of the airflow is faster, so that the wind force received by the shunt area at the windward position can be reduced, thereby improving the balancing effect of the cable.

[0054] Further, the manufacturing method of the balancing structure cable includes the following steps:

[0055] S1, preparing materials needed for making each layer of the cable;

[0056] S2, feeding the core into the extruder;

[0057] S3, extruding the insulation layer outside the conductor by the extruder to obtain the first semi-finished cable and cooling;

[0058] S4, coating the first semi-finished cable after cooling by the coating machine, the material for coating is copper foil, and the braider braids copper wire on the first semi-finished cable after coating to form a shielding layer, thereby obtaining the second semi-finished cable;

[0059] S5, extruding the waterproof layer, the metal sheath and the balance layer on the second semi-finished cable by the extruder in sequence to obtain the cable;

[0060] Specifically, the balance layer is extruded by a special mold during the extrusion process, and the mold is set by a person skilled in the art according to the shape of the balance layer.

[0061] S6, checking whether the quality of the cable is qualified.

[0062] Further, checking whether the quality of the cable is qualified includes the following steps:

[0063] S61, obtaining a cable sample from the cable, and dividing the cable sample into a first cable sample, a second cable sample and a third cable sample;

[0064] S62, placing the first cable sample in a first laboratory, clamping both ends of the first cable sample, and connecting the input and output of the first cable sample to a first test circuit;

[0065] S63, placing the second cable sample in a second laboratory, clamping both ends of the second cable sample, connecting the input and output of the second cable sample to a second test circuit, and blowing the second cable sample in the second laboratory;

[0066] S64, placing the third cable sample in a third laboratory, clamping both ends of the third cable sample, connecting the input and output of the third cable sample to a third test circuit, and spraying the third cable sample in the third laboratory;

[0067] S65, collecting data generated during the experiment, and calculating the quality index of the cable;

[0068] S66, determining whether the value of the quality index is greater than a set threshold value, if yes, the quality of the cable is unqualified, otherwise, the quality of the cable is qualified.

[0069] Specifically, the first, second and third test circuits are set by a person skilled in the art; the experimental time of the three experiments on the three cable samples is the same; the greater the quality index of the cable, the worse the quality of the cable.

[0070] Further, the calculating the quality index of the cable comprises the following steps:

[0071] S651, calculating the normal defect index of the first cable sample according to the following formula:

[0072]

[0073] Wherein, ZB1 is the normal defect index, t is the experimental time, NUM1 is the number of noises included in the current output signal of the first cable sample in the experiment, input1(t) is the current input of the first cable sample, and output1(t) is the current output of the first cable sample;

[0074] Specifically, the normal defect index is used to represent the defects generated by the cable itself under the condition that the cable is not disturbed by the outside world;

[0075] S652, calculating the blowing influence index of the second cable sample according to the following formula:

[0076]

[0077] Wherein, ZB2 is the blowing influence index, I is the number of wind scale types adopted in the blowing process, lenel i is the Beaufort scale corresponding to the i-th wind scale type, k i is the wind scale weight corresponding to the i-th wind scale type, d imax is the maximum deviation distance of the second cable sample in the blowing process of the i-th wind scale type;

[0078] NUM2 is the number of noises included in the current output signal of the second cable sample in the experiment, input2(t) is the current input of the second cable sample, and output2(t) is the current output of the second cable sample;

[0079] Specifically, the cable sample is in a balanced state before the experiment starts, that is, the cable is parallel to the horizontal direction and perpendicular to the vertical direction, and the deviation distance of the cable center in the blowing process must be the largest deviation in the whole cable, and the maximum deviation distance is the maximum distance of the cable center from its original position in the blowing process;

[0080] Specifically, different Beaufort scales of wind are adopted in the blowing process, and different Beaufort scales of wind correspond to different wind scale weights, the Beaufort scale is divided by the prior art, and the wind scale weight is set by the person skilled in the art;

[0081] S653, calculating the water spraying influence index of the second cable sample according to the following formula:

[0082]

[0083] Wherein, ZB3 is the water spray influence index, J is the water spray test times, L j is the water spray rate of the jth water spray, k j is the water spray weight corresponding to the jth water spray, d jmax is the maximum deviation distance of the third cable sample during the jth water spray process;

[0084] NUM3 is the number of noises included in the current output signal of the third cable sample during the experiment, input3(t) is the current input of the third cable sample, and output3(t) is the current output of the third cable sample;

[0085] Specifically, the water spray is simulated rain, and water is sprayed from directly above the cable, and the water spray rate is the volume of water output per unit time; the water spray weight is set by a person skilled in the art;

[0086] S654, the quality index of the cable is calculated according to the following formula:

[0087] ZB = h1*ZB1 + h2*ZB2 + h2*ZB1

[0088] Wherein, ZB is the quality index, h1 is the normal defect weight, h2 is the blowing influence weight, h3 is the water spray influence weight, ZB1 is the normal defect index, ZB2 is the blowing influence index, and ZB3 is the water spray influence index.

[0089] The beneficial effects of the present scheme are: 1. The pressure buffer zone can disperse the force received by the cable through the expansion and contraction of the spring-like structure, and at the same time, the shunt zone can disperse the wind force through air pressure. The above structure improves the balancing ability of the cable when it is affected by external factors, and can ensure normal work even in bad weather.

[0090] 2. By setting the quality index, the quality of the cable is analyzed, the working performance of the cable itself is analyzed, whether the cable can maintain normal work when affected by external factors, and the balancing ability of the cable itself when affected by external factors. It is beneficial to quantify the cable quality and make further improvements to the cable based on it.

[0091] Embodiment two: this embodiment should be understood as containing all the features of any one of the preceding embodiments, and further improving on the basis thereof, and further in that the weights in embodiment one can be obtained according to the following manner:

[0092] For k i :

[0093]

[0094] Wherein, e is a natural constant, E(level) is the average Beaufort wind level of the application scene of the cable in the last year before the cable is put into application;

[0095] For k j :

[0096]

[0097] Wherein, E(L j ) is the average precipitation rate of the application scene of the cable in the last year before the cable is put into application, and the average precipitation rate is the total precipitation amount of the application scene in the last month divided by the total rain time;

[0098] For h1, the value of h1 can be determined according to the importance of the defects of the cable itself in the power transmission capacity in the quality evaluation. If the quality evaluation mainly evaluates the balance capacity of the cable, the value of h1 can be set to 0.1. If the evaluation focuses on both the balance capacity of the cable and the defects of the cable itself, the value of h1 can be set to 0.5.

[0099] For h2 and h3:

[0100]

[0101] Wherein, G1 is the wind level index, and G2 is the precipitation level index. Generally, the Beaufort wind level is divided into 12 levels. When the value of E(level) is 0-2, G1 is 1. When the value of E(level) is 3-5, G1 is 2. When the value of E(level) is 6-8, G1 is 3. When the value of E(level) is 9-12, G1 is 4.

[0102] The precipitation level is generally divided into light rain, moderate rain, heavy rain, heavy rain, heavy rain, and heavy rain. The precipitation level index can be obtained by the average precipitation level of the application scene of the cable in the last year before the cable is put into application. The average precipitation level is obtained by obtaining the total rainfall in the last year of the application scene, and then dividing by 365 days (or 364 days) to obtain the average daily rainfall. According to the average daily rainfall, the average precipitation level is determined. The daily rainfall determines the precipitation level, which is prior art and will not be described in detail here.

[0103] When the average precipitation level is light rain, G2 is 1. When the average precipitation level is moderate rain, G2 is 2. When the average precipitation level is heavy rain, G2 is 3. When the average precipitation level is heavy rain, heavy rain, or heavy rain, G2 is 4.

[0104] The beneficial effect of the embodiment is that the weights are obtained by obtaining the data of the cable in the application scene for one year before the cable is put into application, which is beneficial to change the influence of the experimental parameters on the calculation result according to the difference between the application scene and the experimental process, beneficial to evaluate the influence of the application scene on each index, and beneficial to improve the fitting degree of the calculation result of the quality index and the actual application scene.

[0105] The above disclosed content is only the preferred feasible embodiment of the present application, and does not limit the protection scope of the present application, so any equivalent technical changes made by applying the content of the present application and the drawings are included in the protection scope of the present application, and furthermore, the elements can be updated as the technology develops. The above units are only examples, and the corresponding units can be used in different designs according to actual needs when the present solution is implemented by those skilled in the art.

Claims

1. A manufacturing method of a balanced structure cable for high altitude power transmission, characterized by, The balanced structure cable comprises a core, an insulation layer, a shielding layer, a waterproof layer, a metal sheath and a balancing layer arranged in sequence from inside to outside, the core comprises a copper conductor, and the core is used for transmitting electric energy; the insulation layer comprises powdered magnesium oxide, the particle size of the powdered magnesium oxide is 0.5-1 μm, and the insulation layer is used for preventing electric energy leakage or cable short circuit of the cable; the shielding layer is composed of a copper foil and a copper wire, and the shielding layer is used for reducing electromagnetic interference; The waterproof layer is used for preventing moisture from entering the shielding layer; The metal sheath is used for protecting the overall structure of the cable, and the metal sheath is a copper sheath; The balancing layer is used for improving the balancing capacity of the cable; The manufacturing method of the balanced structure cable for high-altitude power transmission comprises the following steps: S1, preparing materials required for manufacturing each layer of the cable; S2, feeding the core into an extruding machine; S3, extruding the insulation layer outside the conductor by the extruding machine to obtain a first semi-finished cable and cooling; S4, coating the first semi-finished cable after cooling by a coating machine, the material for coating is a copper foil, braiding the copper wire on the first semi-finished cable after coating by a braiding machine to form a shielding layer, and obtaining a second semi-finished cable; S5, extruding the waterproof layer, the metal sheath and the balancing layer on the second semi-finished cable in sequence by the extruding machine to obtain the cable; S6, checking whether the quality of the cable is qualified or not; The checking whether the quality of the cable is qualified or not comprises the following steps: S61, obtaining a cable sample from the cable, and dividing the cable sample into a first cable sample, a second cable sample and a third cable sample; S62, placing the first cable sample in a first laboratory, clamping both ends of the first cable sample, connecting the input and output of the first cable sample to a first test circuit, and blowing the first cable sample in the first laboratory; S63, placing the second cable sample in a second laboratory, clamping both ends of the second cable sample, connecting the input and output of the second cable sample to a second test circuit, and blowing the second cable sample in the second laboratory; S64, placing the third cable sample in a third laboratory, clamping both ends of the third cable sample, connecting the input and output of the third cable sample to a third test circuit, and spraying water on the third cable sample in the third laboratory; S65, collecting data generated in the experiment, and calculating a quality index of the cable; S66, judging whether the value of the quality index is greater than a set threshold value, if yes, the quality of the cable is unqualified, otherwise, the quality of the cable is qualified; The calculating the quality index of the cable comprises the following steps: S651, calculating a normal defect index of the first cable sample according to the following formula: ； wherein, is a normality defect indicator, t is the experimental time, is the number of noise included in the current output signal of the first cable sample during the experiment, is the current input of the first cable sample, is the current output of the first cable sample; S652, calculating a blowing influence index of the second cable sample according to the following formula: ； wherein, is a blowing influence index, I is the number of wind scale types used in the blowing process, is the Beaufort scale corresponding to the i-th wind scale type, is the wind scale weight corresponding to the i-th wind scale type, is the maximum deviation distance of the second cable sample in the blowing process of the i-th wind scale type; a number of noise components included in the current output signal of the second cable sample during the experiment, a current input for the second cable sample, a current output for the second cable sample; S653, calculating a spraying water influence index of the second cable sample according to the following formula: ； wherein, is a water spray impact index, J is a number of water spray tests, is a water spray rate at the jth water spray, is a water spray weight corresponding to the jth water spray, is a maximum deviation distance of the third cable sample during the jth water spray. a number of noise components included in the current output signal of the third cable sample during the experiment, a current input for the third cable sample, a current output for the third cable sample; S654, calculating the quality index of the cable according to the following formula: ； wherein, is a quality index, is a normality defect weight, is a blow influence weight, is a water spray influence weight, is a normality defect index, is a blow influence index, is a water spray influence index.

2. The manufacturing method of the balanced structure cable for high-altitude power transmission according to claim 1, characterized by, The rated voltage of the cable is 10 kv, the core comprises three copper conductors, and the sectional area of each copper conductor is 50 square millimeters, and the distance from the center of the cable to the surface of the metal sheath of the cable is 50 millimeters.

3. The manufacturing method of the balanced structure cable for high-altitude power transmission according to claim 2, characterized by, The balancing layer is made of elastic plastic, the thickness of the balancing layer is 10 millimeters, the balancing layer is composed of a conventional zone and a pressure buffer zone, the length of the conventional zone is 1 m, the length of the pressure buffer zone is 0.1 m, and the pressure buffer zone is used for buffering the pressure generated when the cable is impacted.

4. The method of claim 3, wherein the method is used for manufacturing a high-altitude power transmission balanced structure cable. The pressure buffer zone adopts a spring-like structure, and the elastic plastic exists in the form of strips in the pressure buffer zone, the strip-shaped elastic plastic is spirally wound outside the metal sheath to form the pressure buffer zone, the diameter of the strip-shaped elastic plastic is 0.008m to 0.01m, and the gap between each layer of spirals is less than 0.001m.

5. The method of claim 4, wherein the method is used for manufacturing a high-altitude power transmission balanced structure cable. The conventional zone comprises a plurality of flow guide zones for shunting the airflow received by the cable, the flow guide zones are arranged along the elongation direction of the cable, and the arrangement interval of the flow guide zones is between 0.04m and 0.06m; each flow guide zone comprises four shunt zones, and the shunt zones are arranged around the cable; and the interval distance between each shunt zone is the same.

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