Flame-retardant power cable

Abstract

The invention belongs to the technical field of electric power, and discloses a flame-retardant power cable which is provided with a cable core composed of two same first insulated wires, two same third insulated wires, two same seventh insulated wires, a second insulated wire, a fourth insulated wire, a fifth insulated wire and a sixth insulated wire. The cable core forms a regular hexagonal cross section in a first use state, and is laid in a cable pipeline with a regular hexagonal or circular cross section; the cable core forms a rectangular cross section in the second use state and is used for being laid in a cable pipeline with the rectangular cross section. The invention has the following main technical effects of convenience in manufacturing, high percent of pass, flexibility, convenience and quickness in use, suitability for pipelines with different cross section shapes, capability of utilizing pipeline space resources to the greatest extent and capability of saving pipeline renting cost and construction cost.

Description

Technical Field

[0001] The invention belongs to the technical field of electric power, and in particular relates to a flame-retardant power cable. Background Art

[0002] Common laying methods for power cables include overhead, pipeline, direct burial, etc. With the continuous growth of power demand and the scarcity of pipeline space, the cost of leasing pipeline space is getting higher and higher, especially in large and medium-sized cities. On the other hand, the cross-sections of pipelines commonly used in the prior art are rectangular, circular, and polygonal. The cables in the prior art are usually circular cross-section structures. When the cables in the prior art are laid in the pipelines in the prior art, space resources are often wasted. For example, when a circular cable is in a rectangular cross-section pipeline, more external space is wasted. When it is in a circular space, a pipeline of matching size is required to make more use of space resources.

[0003] When cables in the prior art are used in pipes with different cross-sections, it is impossible to maximize the use of space resources. The applicant's customers often use pipes with rectangular, circular and regular polygonal cross-sections, and the above-mentioned pipes are often laid together. CN113764127A discloses a fire-retardant cable that can be used for different pipes. It can be suitable for pipes with square and regular triangle cross-sections, but cannot be suitable for pipes with regular hexagonal and rectangular cross-sections at the same time. Summary of the invention

[0004] To solve the above problems, the purpose of the present invention is to disclose a flame retardant power cable, which is achieved by adopting the following technical solutions.

[0005] A flame-retardant power cable, characterized in that: it has a cable core composed of two identical first insulated wires, two identical third insulated wires, two identical seventh insulated wires, a second insulated wire, a fourth insulated wire, a fifth insulated wire, and a sixth insulated wire; the cable core forms a regular hexagonal cross-section in a first use state, and is used for laying in a cable duct with a regular hexagonal or circular cross-section; the cable core forms a rectangular cross-section in a second use state, and is used for laying in a cable duct with a rectangular cross-section.

[0006] The flame-retardant power cable described above is characterized in that a wrapping layer for maintaining the shape of the cable core is provided outside the cable core.

[0007] The flame-retardant power cable described above is characterized in that the material of the wrapping layer is polyester yarn or non-woven fabric or water-blocking tape or polyester tape.

[0008] The flame-retardant power cable described above is characterized in that a protective layer for maintaining the shape of the cable core is provided outside the cable core, the material of the protective layer is plastic, and the cross-sectional shape of the protective layer is consistent with the cross-sectional shape of the cable core.

[0009] The flame-retardant power cable described above is characterized in that: the insulated wire is composed of a conductor and an insulating layer covering the conductor; and the insulating layer is made of flame-retardant material.

[0010] A flame-retardant power cable, characterized in that: it has a cable core consisting of two identical first insulated wires, a second insulated wire, two identical third insulated wires, a fourth insulated wire, a fifth insulated wire, a sixth insulated wire, and two identical seventh insulated wires; the first insulated wire is composed of a first conductor and a total insulating layer covering the first conductor, the total insulating layer is composed of a first insulating layer, a second insulating layer, a third insulating layer, and a fourth insulating layer, and the second insulating layer and the third insulating layer are perpendicular to each other; the second insulated wire is composed of a second conductor and a total insulating sublayer covering the second conductor, the total insulating sublayer is composed of a first insulating sublayer, a second insulating sublayer, a third insulating sublayer, and a fourth insulating sublayer, and the third insulating layer and the fourth insulating layer are perpendicular to each other; the third insulated wire is composed of a first insulating sublayer, a second insulating sublayer, a third insulating sublayer, and a fourth insulating sublayer, and the third insulating sublayer and the fourth insulating sublayer are perpendicular to each other. It is composed of a third conductor and a total insulating layer covering the third conductor, the total insulating layer is composed of a first insulating layer, a second insulating layer, a third insulating layer and a fourth insulating layer, and the first insulating layer and the fourth insulating layer are perpendicular to each other; the fourth insulated wire is composed of a fourth conductor and a total insulating skin covering the fourth conductor, the total insulating skin is composed of a first insulating skin, a second insulating skin, a third insulating skin and a fourth insulating skin, the first insulating skin and the third insulating skin are parallel to each other, the second insulating skin and the fourth insulating skin are parallel to each other, and the first insulating skin and the second insulating skin are perpendicular to each other; the fifth insulated wire is composed of a fifth conductor and a total insulating sleeve covering the fifth conductor, the total insulating sleeve is composed of a first insulating sleeve, a second insulating sleeve, a third insulating sleeve and a fourth insulating sleeve, The third insulating sleeve and the fourth insulating sleeve are perpendicular to each other; the sixth insulated wire is composed of the sixth conductor and the total insulating shell covering the sixth conductor, the total insulating shell is composed of the first insulating shell, the second insulating shell, the third insulating shell and the fourth insulating shell, the first insulating shell and the third insulating shell are parallel, and the first insulating shell and the second insulating shell are perpendicular to each other; the seventh insulated wire is composed of the seventh conductor and the total insulating sheath covering the seventh conductor, the total insulating sheath is composed of the first insulating sheath, the second insulating sheath and the third insulating sheath, and the first insulating sheath and the second insulating sheath are perpendicular to each other; the first insulating layer, the second insulating layer, the first insulating sublayer, the second insulating sublayer, the first insulating branch layer, the second insulating branch layer, the first insulating sleeve and the first insulating shell have equal lengths, and the first insulating The sum of the lengths of the third insulating sheath and the fourth insulating shell is equal to the length of the third insulating branch layer, the sum of the lengths of the third insulating sleeve and the third insulating shell is equal to the length of the second insulating sheath, the length of the fourth insulating sleeve is equal to the length of the second insulating shell, the length of the second insulating sleeve is equal to the length of the fourth insulating layer, the sum of the lengths of the third insulating sublayer and the third insulating skin is equal to the length of the fourth insulating layer, the length of the second insulating sheath is equal to the length of the fourth insulating sleeve, and the sum of the lengths of the first insulating sheath and the first insulating skin is equal to the length of the third insulating branch layer; when the power cable is in the first usage state, the cross-section of the cable core is a regular hexagon; when the power cable is in the second usage state, the cross-section of the cable core is a rectangle.

[0011] The flame-retardant power cable described above is characterized in that: a flame-retardant layer is provided outside the cable core, and the shape of the flame-retardant layer corresponds to and is consistent with the shape of the cable core, that is, when the cable core is a regular hexagon, the flame-retardant layer is also a similarly enlarged regular hexagon, and expands outward from the corresponding side of the cable core; when the cable core is a rectangle, the flame-retardant layer is also a similarly enlarged rectangle, and expands outward from the corresponding side of the cable core.

[0012] The present application has the following major beneficial technical effects: easy manufacturing, high pass rate, flexible, convenient and fast use, adaptability to pipes of different cross-sectional shapes and maximum utilization of pipe space resources, saving pipe rental costs and construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the cross-sectional structure of the present invention in the first use state.

[0014] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention in the second usage state. DETAILED DESCRIPTION

[0015] In order to enable those skilled in the art to better understand and implement this patent, the marks in the drawings are now described in detail in conjunction with the drawings in the specification.

[0016] In the figure: 1—first insulating wire, 2—second insulating wire, 3—third insulating wire, 4—fourth insulating wire, 5—fifth insulating wire, 6—sixth insulating wire, 7—seventh insulating wire, 11—first insulating layer, 12—second insulating layer, 13—third insulating layer, 21—first insulating sublayer, 22—second insulating sublayer, 23—third insulating sublayer, 31—first insulating branch layer, 32—second insulating branch layer, 33—third insulating branch layer, 41—first insulating skin, 42—second insulating skin, 43—third insulating skin, 51—first insulating sleeve, 52—second insulating sleeve, 53—third insulating sleeve, 61—first insulating shell, 62—second insulating shell, 63—third insulating shell, 71—first insulating sheath, 72—second insulating sheath, 73—third insulating sheath.

[0017] Please see Figure 1 to Figure 2 A flame-retardant power cable, characterized in that: it has a cable core composed of two identical first insulated wires, two identical third insulated wires, two identical seventh insulated wires, a second insulated wire, a fourth insulated wire, a fifth insulated wire, and a sixth insulated wire; the cable core has a regular hexagonal cross-section in a first use state, and is used for laying in a cable duct with a regular hexagonal or circular cross-section; the cable core has a rectangular cross-section in a second use state, and is used for laying in a cable duct with a rectangular cross-section.

[0018] The flame-retardant power cable described above is characterized in that a wrapping layer for maintaining the shape of the cable core is provided outside the cable core.

[0019] The flame-retardant power cable described above is characterized in that the material of the wrapping layer is polyester yarn or non-woven fabric or water-blocking tape or polyester tape.

[0020] The flame-retardant power cable described above is characterized in that a protective layer for maintaining the shape of the cable core is provided outside the cable core, the material of the protective layer is plastic, and the cross-sectional shape of the protective layer is consistent with the cross-sectional shape of the cable core.

[0021] The flame-retardant power cable described above is characterized in that the insulating wire is composed of a conductor and an insulating layer covering the conductor.

[0022] A flame-retardant power cable, characterized in that: it has a cable core consisting of two identical first insulated wires 1, a second insulated wire 2, two identical third insulated wires 3, a fourth insulated wire 4, a fifth insulated wire 5, a sixth insulated wire 6, and two identical seventh insulated wires 7; the first insulated wire 1 is composed of a first conductor and a total insulating layer covering the first conductor, the total insulating layer is composed of a first insulating layer 11, a second insulating layer 12, a third insulating layer 13, and a fourth insulating layer, and the second insulating layer 12 and the third insulating layer 13 are perpendicular to each other; the second insulated wire 2 is composed of a second conductor and a total insulating layer covering the first conductor The third insulating layer is composed of a first insulating layer 21, a second insulating layer 22, a third insulating layer 23, and a fourth insulating layer, and the third insulating layer 23 and the fourth insulating layer are perpendicular to each other; the third insulating wire 3 is composed of a third conductor and a total insulating layer covering the third conductor, and the total insulating layer is composed of a first insulating layer 31, a second insulating layer 32, a third insulating layer 33, and a fourth insulating layer, and the first insulating layer 31 and the fourth insulating layer are perpendicular to each other; the fourth insulating wire 4 is composed of a fourth conductor and a total insulating layer covering the fourth conductor The total insulation skin is composed of the first insulation skin 41, the second insulation skin 42, the third insulation skin 43, and the fourth insulation skin. The first insulation skin 41 and the third insulation skin 43 are parallel, the second insulation skin 42 and the fourth insulation skin are parallel, and the first insulation skin 41 and the second insulation skin 42 are perpendicular to each other. The fifth insulated wire 5 is composed of the fifth conductor and the total insulation sleeve covering the fifth conductor. The total insulation sleeve is composed of the first insulation sleeve 51, the second insulation sleeve 52, the third insulation sleeve 53, and the fourth insulation sleeve. The third insulation sleeve 53 and the fourth insulation sleeve are perpendicular to each other. The edge line 6 is composed of a sixth conductor and a total insulating shell covering the sixth conductor, the total insulating shell is composed of a first insulating shell 61, a second insulating shell 62, a third insulating shell 63, and a fourth insulating shell, the first insulating shell 61 and the third insulating shell 63 are parallel, and the first insulating shell 61 and the second insulating shell 62 are perpendicular to each other; the seventh insulating line 7 is composed of a seventh conductor and a total insulating sheath covering the seventh conductor, the total insulating sheath is composed of a first insulating sheath 71, a second insulating sheath 72, and a third insulating sheath 73, and the first insulating sheath 71 and the second insulating sheath 72 are perpendicular to each other;The first insulating layer 11, the second insulating layer 12, the first insulating sublayer 21, the second insulating sublayer 22, the first insulating branch layer 31, the second insulating branch layer 32, the first insulating sleeve 51, and the first insulating shell 61 have equal lengths. The sum of the lengths of the first insulating sheath 71 and the fourth insulating shell is equal to the length of the third insulating branch layer 33. The sum of the lengths of the third insulating sleeve 53 and the third insulating shell 63 is equal to the length of the second insulating sheath 72. The length of the fourth insulating sleeve is equal to the length of the second insulating shell 62. The length of the second insulating sleeve 52 is equal to the length of the fourth insulating sleeve. The lengths of the insulating layers are equal, the sum of the lengths of the third insulating sublayer 23 and the third insulating skin 43 is equal to the length of the fourth insulating layer, the length of the second insulating sheath 72 is equal to the length of the fourth insulating sleeve, and the sum of the lengths of the first insulating sheath 71 and the first insulating skin 41 is equal to the length of the third insulating branch layer 33; when the power cable is in the first use state, the cross-section of the cable core is a regular hexagon; specifically: the first insulating layer 11 of the first first insulating wire 1 is connected and spliced ​​with the second insulating sublayer 22 to form a first plane, and the first first insulating wire 1 The second insulating layer 12 is connected to the first insulating layer 31 of the first third insulating wire 3 to form a second plane, the second insulating layer 32 of the first third insulating wire 3 is connected to the first insulating shell 61 to form a third plane, the first insulating sleeve 51 is connected to the first insulating layer 11 of the second first insulating wire 1 to form a fourth plane, the second insulating layer 12 of the second first insulating wire 1 is connected to the first insulating layer 31 of the second third insulating wire 3 to form a fifth plane, the second insulating layer 32 of the second third insulating wire 3 is connected to the first insulating sublayer 21 to form a fifth plane, The sixth plane is synthesized, the angle between the first plane and the second plane is 120 degrees, the angle between the second plane and the third plane is 120 degrees, the angle between the third plane and the fourth plane is 120 degrees, the angle between the fourth plane and the fifth plane is 120 degrees, the angle between the fifth plane and the sixth plane is 120 degrees, the angle between the sixth plane and the first plane is 120 degrees, the first plane is parallel to the fourth plane, the second plane is parallel to the fifth plane, the third plane is parallel to the sixth plane, and the first to sixth planes form a cross-section of a regular hexagon;The fourth insulating layer of the first third insulated wire 3 is in contact with the third insulating layer 13 of the first first insulated wire 1, a portion of the third insulating sheath 73 of the first seventh insulated wire 7 is in contact with the third insulating layer 13 of the first first insulated wire 1, the first insulating sheath 71 of the first seventh insulated wire 7 is in contact with the third insulating layer 33 of the first third insulated wire 3, the third insulating layer 33 of the first third insulated wire 3 is in contact with the fourth insulating shell, the third insulating shell 63 is in contact with the second insulating layer 72 of the first seventh insulated wire 7, the second insulating layer 72 of the first seventh insulated wire 7 is in contact with the third insulating sleeve 53, the fourth insulating sleeve is in contact with the second insulating shell 62, and the second insulating sleeve 52 is in contact with the fourth insulating layer of the second first insulated wire 1 , the third insulation layer 13 of the second first insulation wire 1 is bonded to the fourth insulation branch layer of the second third insulation wire 3, the third insulation layer 13 of the second first insulation wire 1 is bonded to a part of the third insulation sheath 73 of the second seventh insulation wire 7, the first insulation sheath 71 of the second seventh insulation wire 7 is bonded to the third insulation branch layer 13 of the second third insulation wire 3, the second insulation sheath 72 of the second seventh insulation wire 7 is bonded to the fourth insulation skin, the first insulation skin 41 is bonded to the third insulation branch layer 13 of the second third insulation wire 3, the second insulation skin 42 is bonded to the fourth insulation sublayer, the third insulation skin 43 is bonded to the fourth insulation layer of the first first insulation wire 1, and the third insulation sublayer 23 is bonded to the fourth insulation layer of the first first insulation wire 1; When the power cable is in the second use state, the cross-section of the cable core is rectangular; specifically, the first insulating sheath 71 of the first seventh insulated wire 7, the third insulating sublayer 33 of the first third insulated wire 3, and the fourth insulating shell are sequentially connected and assembled into a seventh plane, the second insulating sheath 72 of the first seventh insulated wire 7 and the second insulating skin 42 are connected and assembled into an eighth plane, the first insulating skin 41, the fourth insulating sublayer, and the first insulating sheath 71 of the first seventh insulated wire 7 are sequentially connected and assembled into a ninth plane, and the second insulating layer 42 of the first seventh insulated wire 7 is sequentially connected and assembled into a ninth plane. The insulating protective layer 72, the third insulating sleeve 53, and the third insulating shell 63 are sequentially connected and assembled into a tenth plane, the seventh plane is parallel to the ninth plane, the eighth plane is parallel to the tenth plane, and the seventh plane is perpendicular to the eighth plane; the fourth insulating branch layer of the first third insulating wire 3 is in contact with the third insulating protective layer 73 of the first seventh insulating wire 7, the third insulating layer 13 of the first insulating wire 1 is in contact with the third insulating protective layer 73 of the first seventh insulating wire 7, and the third insulating branch layer 33 of the first third insulating wire 3 is in contact with the first insulating sublayer 21 of the first insulating wire 1 The second insulating layer 32 of the first third insulated wire 3 is in contact with the first insulating shell 61, the second insulating shell 62 is in contact with the fourth insulating sleeve, the first insulating sleeve 51 is in contact with the first insulating layer 11 of the first insulated wire 1, the third insulating skin 43 is in contact with the fourth insulating layer of the first insulated wire 1, the fourth insulating layer of the second third insulated wire 3 is in contact with the fourth insulating layer of the first first insulated wire 1, the third insulating skin is in contact with the third insulating layer 33 of the second third insulated wire 3, and the second insulating layer of the second third insulated wire 3 is in contact with the 32 is fitted with the first insulating sublayer 21, the third insulating branch layer 33 of the second third insulating wire 3 is fitted with the first insulating layer 11 of the second first insulating wire 1, the fourth insulating layer of the second first insulating wire 1 is fitted with the second insulating sleeve 52, the second insulating layer 12 of the second first insulating wire 1 is fitted with the fourth insulating sublayer, the third insulating sublayer 23 is fitted with the third insulating sheath 73 of the second seventh insulating wire 7, and the third insulating layer 13 of the second first insulating wire 1 is fitted with the third insulating sheath 73 of the second seventh insulating wire 7.

[0023] The materials of the total insulation layer, total insulation sub-layer, total insulation branch layer, total insulation skin, total insulation sleeve, total insulation shell and total insulation sheath in the present application are all plastics, and the plastic is preferably flame-retardant plastic.

[0024] Furthermore, the materials of the above-mentioned total insulation layer, total insulation sub-layer, total insulation branch layer, total insulation skin, total insulation sleeve, total insulation shell, and total insulation sheath are all flame retardant plastics, such as PVC, low-smoke zero halogen, low-smoke low halogen, TPU, TPE, polyurethane, etc.

[0025] The material of the conductor described in this application is copper or aluminum or alloy or other materials with high conductivity.

[0026] The conductors described in this application can be partially or completely replaced by components with communication functions, such as optical fibers, optical fiber ribbons, components with optical fibers or optical fiber ribbons, etc., which can expand the scope of application and achieve multiple uses of one cable.

[0027] By simply matching and using the required sizes, the conductor can reach the required cross-sectional area or nominal current-carrying capacity, so that multi-channel transmission can be achieved. For example, in this embodiment, there can be 10 single wires combined into 2 three-phase three-wires, 1 three-phase four-wire, 5 single-phase wires, 1 single-phase, 2 three-phase four-wires, and so on.

[0028] When this application is used, facing a rectangular pipe, it is assembled into Figure 2 The structure is laid in the pipeline, which can save pipeline resources and costs to the greatest extent; when facing a regular hexagonal pipeline, it can be assembled into Figure 1 The structure is laid in the pipeline, which can save pipeline resources and costs to the greatest extent; when facing a circular pipeline, it can be assembled into Figure 1 The structure is laid in the pipeline. Although it cannot fill the pipeline space, it also achieves the purpose of saving pipeline resources and costs to the greatest extent.

[0029] The present application has the following major beneficial technical effects: easy manufacturing, high pass rate, flexible, convenient and fast use, adaptability to pipes of different cross-sectional shapes and maximum utilization of pipe space resources, saving pipe rental costs and construction costs.

[0030] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A flame-retardant power cable, characterized in that: The invention relates to a cable core composed of two identical first insulated wires, two identical third insulated wires, two identical seventh insulated wires, a second insulated wire, a fourth insulated wire, a fifth insulated wire and a sixth insulated wire; the cable core has a regular hexagonal cross section in a first use state and is used for being laid in a cable duct with a regular hexagonal or circular cross section; the cable core has a rectangular cross section in a second use state and is used for being laid in a cable duct with a rectangular cross section.

2. A flame-retardant power cable according to claim 1, characterized in that: The cable core is provided with a wrapping layer outside to maintain the shape of the cable core.

3. A flame-retardant power cable according to claim 2, characterized in that: The material of the wrapping layer is polyester yarn or non-woven fabric or water-blocking tape or polyester tape.

4. A flame-retardant power cable according to any one of claims 1 to 3, characterized in that: The cable core is provided with a protective layer for maintaining the shape of the cable core. The material of the protective layer is plastic, and the cross-sectional shape of the protective layer is consistent with the cross-sectional shape of the cable core.

5. A flame-retardant power cable according to any one of claims 1 to 3, characterized in that: The insulated wire consists of a conductor and an insulating layer covering the conductor; the insulating layer is a flame retardant material.

6. A flame retardant power cable, characterized in that: A cable core comprising two identical first insulating wires (1), a second insulating wire (2), two identical third insulating wires (3), a fourth insulating wire (4), a fifth insulating wire (5), a sixth insulating wire (6), and two identical seventh insulating wires (7); the first insulating wire (1) comprises a first conductor and a total insulating layer covering the first conductor, the total insulating layer comprises a first insulating layer (11), a second insulating layer (12), a third insulating layer (13), and a fourth insulating layer, the second insulating layer (12) and the third insulating layer (13) being perpendicular to each other; the second insulating wire (2) comprises a second conductor and a total insulating layer covering the second conductor; The third insulating layer (23) and the fourth insulating layer (23) are perpendicular to each other. The third insulating layer (23) and the fourth insulating layer (23) are perpendicular to each other. The third insulating wire (3) is composed of a third conductor and a total insulating layer covering the third conductor. The total insulating layer is composed of a first insulating layer (31), a second insulating layer (32), a third insulating layer (33) and a fourth insulating layer. The first insulating layer (31) and the fourth insulating layer are perpendicular to each other. The fourth insulating wire (4) is composed of a fourth conductor and a total insulating layer covering the fourth conductor. The insulation skin is composed of a first insulation skin (41), a second insulation skin (42), a third insulation skin (43), and a fourth insulation skin. The first insulation skin (41) and the third insulation skin (43) are parallel to each other, the second insulation skin (42) and the fourth insulation skin are parallel to each other, and the first insulation skin (41) and the second insulation skin (42) are perpendicular to each other. The fifth insulating wire (5) is composed of a fifth conductor and a total insulation sleeve covering the fifth conductor. The total insulation sleeve is composed of a first insulation sleeve (51), a second insulation sleeve (52), a third insulation sleeve (53), and a fourth insulation sleeve. The third insulation sleeve (53) and the fourth insulation sleeve are perpendicular to each other. The sixth insulating wire (6) is composed of The sixth conductor and a total insulating shell covering the sixth conductor are composed of a first insulating shell (61), a second insulating shell (62), a third insulating shell (63), and a fourth insulating shell. The first insulating shell (61) and the third insulating shell (63) are parallel to each other, and the first insulating shell (61) and the second insulating shell (62) are perpendicular to each other. The seventh insulated wire (7) is composed of a seventh conductor and a total insulating sheath covering the seventh conductor. The total insulating sheath is composed of a first insulating sheath (71), a second insulating sheath (72), and a third insulating sheath (73). The first insulating sheath (71) and the second insulating sheath (72) are perpendicular to each other.The first insulating layer (11), the second insulating layer (12), the first insulating sublayer (21), the second insulating sublayer (22), the first insulating branch layer (31), the second insulating branch layer (32), the first insulating sleeve (51), and the first insulating shell (61) have equal lengths; the sum of the lengths of the first insulating sheath (71) and the fourth insulating shell is equal to the length of the third insulating branch layer (33); the sum of the lengths of the third insulating sleeve (53) and the third insulating shell (63) is equal to the length of the second insulating sheath (72); the length of the fourth insulating sleeve is equal to the length of the second insulating shell (62). The length of the second insulating sleeve (52) is equal to the length of the fourth insulating layer, the sum of the lengths of the third insulating sublayer (23) and the third insulating skin (43) is equal to the length of the fourth insulating layer, the length of the second insulating sheath (72) is equal to the length of the fourth insulating sleeve, and the sum of the lengths of the first insulating sheath (71) and the first insulating skin (41) is equal to the length of the third insulating branch layer (33); when the power cable is in the first use state, the cross-section of the cable core is a regular hexagon; when the power cable is in the second use state, the cross-section of the cable core is a rectangle. ; 7. A flame-retardant power cable according to claim 6, characterized in that: The cross section of the cable core is a regular hexagon and is formed in the following manner: the first insulating layer (11) of the first first insulating wire (1) is connected to the second insulating sublayer (22) to form a first plane, the second insulating layer (12) of the first first insulating wire (1) is connected to the first insulating sublayer (31) of the first third insulating wire (3) to form a second plane, the second insulating sublayer (32) of the first third insulating wire (3) is connected to the first insulating shell (61) to form a third plane, the first insulating sleeve (51) is connected to the first insulating layer (11) of the second first insulating wire (1) to form a fourth plane, the second insulating layer (12) of the second first insulating wire (1) is connected to the first insulating layer (31) of the second third insulating wire (3) to form a fourth plane. The insulating sublayers (31) are connected and assembled into a fifth plane, the second insulating sublayer (32) of the second third insulating wire (3) and the first insulating sublayer (21) are connected and assembled into a sixth plane, the angle between the first plane and the second plane is 120 degrees, the angle between the second plane and the third plane is 120 degrees, the angle between the third plane and the fourth plane is 120 degrees, the angle between the fourth plane and the fifth plane is 120 degrees, the angle between the fifth plane and the sixth plane is 120 degrees, the angle between the sixth plane and the first plane is 120 degrees, the first plane is parallel to the fourth plane, the second plane is parallel to the fifth plane, the third plane is parallel to the sixth plane, and the first to sixth planes form a regular hexagonal cross section;The fourth insulating layer of the first third insulating wire (3) is in contact with the third insulating layer (13) of the first first insulating wire (1), a portion of the third insulating sheath (73) of the first seventh insulating wire (7) is in contact with the third insulating layer (13) of the first first insulating wire (1), the first insulating sheath (71) of the first seventh insulating wire (7) is in contact with the third insulating layer (33) of the first third insulating wire (3), the third insulating layer (33) of the first third insulating wire (3) is in contact with the fourth insulating shell, the third insulating shell (63) is in contact with the second insulating layer (72) of the first seventh insulating wire (7), the second insulating layer (72) of the first seventh insulating wire (7) is in contact with the third insulating sleeve (53), the fourth insulating sleeve is in contact with the second insulating shell (62), and the second insulating sleeve (52) is in contact with the fourth insulating layer of the second first insulating wire (1). The third insulating layer (13) of the second first insulating wire (1) is bonded to the fourth insulating layer of the second third insulating wire (3), the third insulating layer (13) of the second first insulating wire (1) is bonded to a portion of the third insulating sheath (73) of the second seventh insulating wire (7), the first insulating sheath (71) of the second seventh insulating wire (7) is bonded to the third insulating layer (13) of the second third insulating wire (3), the second insulating sheath (72) of the second seventh insulating wire (7) is bonded to the fourth insulating layer, the first insulating layer (41) is bonded to the third insulating layer (13) of the second third insulating wire (3), the second insulating layer (42) is bonded to the fourth insulating layer, the third insulating layer (43) is bonded to the fourth insulating layer of the first first insulating wire (1), and the third insulating layer (23) is bonded to the fourth insulating layer of the first first insulating wire (1). ; 8. The flame-retardant power cable according to claim 6, characterized in that: The cross section of the cable core is rectangular in the following manner: the first insulating sheath (71) of the first seventh insulating wire (7), the third insulating sublayer (33) of the first third insulating wire (3), and the fourth insulating shell are sequentially connected and assembled into a seventh plane; the second insulating sheath (72) and the second insulating skin (42) of the first seventh insulating wire (7) are connected and assembled into an eighth plane; the first insulating skin (41), the fourth insulating sublayer, and the first insulating sheath (71) of the first seventh insulating wire (7) are sequentially connected and assembled into a ninth plane; the second insulating sheath (72), the third insulating sleeve (42) of the first seventh insulating wire (7) are sequentially connected and assembled into a ninth plane; 53), the third insulating shell (63) is sequentially connected and assembled into a tenth plane, the seventh plane is parallel to the ninth plane, the eighth plane is parallel to the tenth plane, and the seventh plane is perpendicular to the eighth plane; the fourth insulating layer of the first third insulating wire (3) is in contact with the third insulating sheath (73) of the first seventh insulating wire (7), the third insulating layer (13) of the first insulating wire (1) is in contact with the third insulating sheath (73) of the first seventh insulating wire (7), the third insulating layer (33) of the first third insulating wire (3) is in contact with the first insulating sublayer (21) of the first insulating wire (1), and the first third insulating wire The second insulating layer (32) of the third insulating wire (3) is in contact with the first insulating shell (61), the second insulating shell (62) is in contact with the fourth insulating sleeve, the first insulating sleeve (51) is in contact with the first insulating layer (11) of the first insulating wire (1), the third insulating skin (43) is in contact with the fourth insulating layer of the first insulating wire (1), the fourth insulating layer of the second third insulating wire (3) is in contact with the fourth insulating layer of the first first insulating wire (1), the third insulating skin is in contact with the third insulating layer (33) of the second third insulating wire (3), the second insulating layer (32) of the second third insulating wire (3) is in contact with the first insulating layer (11), and the third insulating skin is in contact with the third insulating layer (33) of the second third insulating wire (3). The third insulating layer (33) of the second third insulating wire (3) is in contact with the first insulating layer (11) of the second first insulating wire (1), the fourth insulating layer of the second first insulating wire (1) is in contact with the second insulating sleeve (52), the second insulating layer (12) of the second first insulating wire (1) is in contact with the fourth insulating sublayer, the third insulating sublayer (23) is in contact with the third insulating sheath (73) of the second seventh insulating wire (7), and the third insulating layer (13) of the second first insulating wire (1) is in contact with the third insulating sheath (73) of the second seventh insulating wire (7).

9. A flame-retardant power cable according to any one of claims 6 to 8, characterized in that: The cable core is provided with a flame retardant layer outside, and the shape of the flame retardant layer corresponds to and is consistent with the shape of the cable core.

10. A flame-retardant power cable according to any one of claims 6 to 8, characterized in that: The materials of the total insulation layer, the total insulation sub-layer, the total insulation support layer, the total insulation skin, the total insulation sleeve, the total insulation shell and the total insulation sheath are all flame-retardant plastics.

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