Medium voltage fire resistant power cable

Abstract

The utility model discloses a kind of medium-voltage fire-resistant power cable, it relates to power cable technical field, to solve the structure of the inside of existing medium-voltage power cable is relatively simple, cannot play effective shielding effect, the practicality is lower problem, its technical scheme main point is including conductor main body, the outside of conductor main body is wrapped with fine steel wire armoring layer, the outside of fine steel wire armoring layer is wrapped with flame-retardant sheath, the inside of conductor main body includes conductor core, the outside of conductor core is sequentially wrapped with conductor shielding layer, insulating layer and insulating shielding layer, the inside of conductor shielding layer includes nonmetallic semiconductive tape and first nonmetallic semiconductive layer, the inside of insulating shielding layer includes second nonmetallic semiconductive layer and metal shielding layer. Reach the effect of convenient use and fire-retardant.

Description

Technical Field

[0001] This utility model relates to the field of power cable technology, and in particular to a medium-voltage fire-resistant power cable. Background Technology

[0002] Power cables are cables specifically designed for transmitting and distributing electrical energy, primarily composed of conductors, insulation materials, and a sheath. Their basic structure typically includes the following components: Conductor: Responsible for transmitting current, usually made of highly conductive copper or aluminum; Insulation layer: Isolates the conductor from the external environment, preventing short circuits and electric shocks; Common materials include polyvinyl chloride (PVC), polyethylene (PE), or cross-linked polyethylene (XLPE); Sheath layer: Protects the insulation layer from external influences such as moisture and mechanical damage, ensuring the long-term stable operation of the cable. Medium and low-voltage cables include PVC-insulated cables and PE-insulated cables, widely used in urban power grids and internal power supply in industrial and mining enterprises. Power cables are not only an important component of modern power systems but also widely used in information transmission systems, mechanical equipment, and instrumentation systems. With the development of new energy technologies, the application of power cables in renewable energy fields such as wind power and solar power generation is becoming increasingly widespread.

[0003] The existing technical solutions mentioned above have the following drawbacks: the internal structure of existing medium-voltage power cables is relatively simple, which cannot provide effective shielding and has low practicality. Utility Model Content

[0004] The purpose of this invention is to provide a medium-voltage fire-resistant power cable.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A medium-voltage fire-resistant power cable includes a conductor body, the outer side of which is wrapped with a fine steel wire armor layer, and the outer side of the fine steel wire armor layer is wrapped with a flame-retardant sheath. The conductor body contains conductor cores, and the outer side of the conductor cores is sequentially wrapped with a conductor shielding layer, an insulation layer, and an insulation shielding layer. The conductor shielding layer contains a non-metallic semi-conductive strip and a first non-metallic semi-conductive layer. The insulation shielding layer contains a second non-metallic semi-conductive layer and a metallic shielding layer. The fine steel wire armor layer is composed of multiple sets of steel wires and is wound around the outer side of the conductor body. Multiple conductor cores are provided, and the multiple conductor cores are spirally wound together.

[0007] By adopting the above technical solutions, the flame-retardant sheath uses ST2 or ST2 type sheath material, and the fine steel wire armored power cable can withstand a certain radial mechanical force and tensile force. The coarse steel wire armor can withstand greater mechanical force and tensile force than the fine steel wire armor. All conductor cores are shielded, consisting of conductor shield and insulation shield. The insulation uses XLPE cross-linked polyethylene insulation material, which is extruded between the conductor shield and the insulation shield. The conductor shield is a non-metallic semi-conductive material, and the semi-conductive material should be tightly bonded to the insulation. For cables with a nominal cross-section of 500mm2 and above, the conductor shield is composed of a semi-conductive tape and an extruded semi-conductive layer, that is, the semi-conductive tape is wrapped first, and then the semi-conductive layer shield is extruded. The resistivity of the conductor shield is not greater than 1000Ω•m, and the insulation shield should be composed of a combination of a non-metallic semi-conductive layer and a metallic layer. After extruding an insulating material over the conductor shielding layer, another layer of semi-conductive material is extruded over the insulation layer of each wire core as an insulating shield. The insulating shield is an extruded peelable semi-conductive layer with a resistivity of no more than 500 Ω•m. The metal shielding layer should be wrapped around the insulation shielding layer of each insulated wire core. Copper wires are connected by cold welding, and copper strips are connected by spot welding. Soldering or mechanical lap joints are not allowed to improve structural strength.

[0008] Furthermore, the non-metallic semiconducting strip is wrapped around the outside of the conductor core, the first non-metallic semiconducting layer is wrapped around the outside of the non-metallic semiconducting strip, the insulating layer is wrapped around the outside of the first non-metallic semiconducting layer, the second non-metallic semiconducting layer is wrapped around the outside of the insulating layer, and the metallic shielding layer is wrapped around the outside of the second non-metallic semiconducting layer.

[0009] By adopting the above technical solution, it is ensured that each conductor core has a shielding effect.

[0010] In summary, the beneficial technical effects of this utility model are as follows:

[0011] It employs a conductor core, a fine steel wire armor layer, a flame-retardant sheath, a conductor shielding layer, an insulating shielding layer, and an insulating layer. Each conductor core has an additional shielding layer on its outer side. By adding different shielding layers in a composite composition, the shielding effect is improved, while also providing flame retardancy, resulting in a product that is easy to use and fire-resistant. Attached Figure Description

[0012] Figure 1 This is a schematic cross-sectional view of the overall structure of this utility model;

[0013] Figure 2 This is a schematic cross-sectional view of the conductor body of this utility model;

[0014] Figure 3 This is a schematic cross-sectional view of the conductor core of this utility model;

[0015] Figure 4This is a schematic cross-sectional view of the conductor shielding layer of this utility model;

[0016] Figure 5 This is a cross-sectional view of the insulating shielding layer of this utility model.

[0017] In the figure, 1 is the conductor body; 2 is the fine steel wire armor layer; 3 is the flame-retardant sheath; 11 is the conductor core; 12 is the conductor shielding layer; 13 is the insulating shielding layer; 14 is the insulating layer; 121 is the non-metallic semi-conductive strip; 122 is the first non-metallic semi-conductive layer; 131 is the second non-metallic semi-conductive layer; and 132 is the metallic shielding layer. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings.

[0019] Reference Figure 1-5 A medium-voltage fire-resistant power cable includes a conductor body 1, with a fine steel wire armor layer 2 wrapped around the outside of the conductor body 1, and a flame-retardant sheath 3 wrapped around the outside of the fine steel wire armor layer 2. The conductor body 1 contains conductor cores 11, and conductor shielding layer 12, insulation layer 14, and insulation shielding layer 13 are sequentially wrapped around the outside of the conductor cores 11. The conductor shielding layer 12 contains a non-metallic semi-conductive strip 121 and a first non-metallic semi-conductive layer 122. The insulation shielding layer 13 contains a second non-metallic semi-conductive layer 131 and a metallic shielding layer 132. The flame-retardant sheath 3 uses ST2 or ST2 type sheath material. The fine steel wire armored power cable can withstand certain radial mechanical forces and tensile forces, while the coarse steel wire armor can withstand greater mechanical forces and tensile forces than the fine steel wire armor. All conductor cores 11 are shielded, consisting of conductor shielding and insulation shielding. The insulation uses XLPE cross-linked polyethylene insulation material, which is extruded between the conductor shielding and the insulation shielding.

[0020] like Figure 1-5 As shown, the fine steel wire armor layer 2 is composed of multiple sets of steel wires. The fine steel wire armor layer 2 is wrapped around the outside of the conductor body 1. Multiple conductor cores 11 are provided, and the multiple conductor cores 11 are spirally wound together. The non-metallic semi-conductive strip 121 is wrapped around the outside of the conductor core 11. The first non-metallic semi-conductive layer 122 is wrapped around the outside of the non-metallic semi-conductive strip 121. The insulating layer 14 is wrapped around the outside of the first non-metallic semi-conductive layer 122. The second non-metallic semi-conductive layer 131 is wrapped around the outside of the insulating layer 14. The metallic shielding layer 132 is wrapped around the outside of the second non-metallic semi-conductive layer 131.

[0021] The implementation principle of this embodiment is as follows: The conductor body 1 is composed of multiple sets of conductor cores 11 inside, and each conductor core 11 has a shielding layer on the outside. Multiple conductor cores 11 are spirally wound together. A non-metallic semi-conductive strip 121 is wrapped around the outside of the conductor core 11. A first non-metallic semi-conductive layer 122 is wrapped around the outside of the non-metallic semi-conductive strip 121. An insulating layer 14 is wrapped around the outside of the first non-metallic semi-conductive layer 122. A second non-metallic semi-conductive layer 131 is wrapped around the outside of the insulating layer 14. A metallic shielding layer 132 is wrapped around the outside of the second non-metallic semi-conductive layer 131 to ensure the shielding effect. At the same time, a flame-retardant sheath is added, which can play a flame-retardant and fire-resistant role.

[0022] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A medium-voltage fire-resistant power cable, comprising a conductor body (1), characterized in that: The conductor body (1) is wrapped with a fine steel wire armor layer (2) on the outside, and a flame-retardant sheath (3) is wrapped on the outside of the fine steel wire armor layer (2). The conductor body (1) includes a conductor core (11) inside. The conductor core (11) is wrapped with a conductor shielding layer (12), an insulation layer (14) and an insulation shielding layer (13) in sequence. The conductor shielding layer (12) includes a non-metallic semi-conductive strip (121) and a first non-metallic semi-conductive layer (122) inside. The insulation shielding layer (13) includes a second non-metallic semi-conductive layer (131) and a metallic shielding layer (132) inside. The fine steel wire armor layer (2) is composed of multiple sets of steel wires. The fine steel wire armor layer (2) is wrapped around the outside of the conductor body (1). There are multiple conductor cores (11), and the multiple conductor cores (11) are spirally wound together.

2. The medium-voltage fire-resistant power cable according to claim 1, characterized in that: The non-metallic semiconducting strip (121) is wrapped around the outside of the conductor core (11), the first non-metallic semiconducting layer (122) is wrapped around the outside of the non-metallic semiconducting strip (121), the insulating layer (14) is wrapped around the outside of the first non-metallic semiconducting layer (122), the second non-metallic semiconducting layer (131) is wrapped around the outside of the insulating layer (14), and the metallic shielding layer (132) is wrapped around the outside of the second non-metallic semiconducting layer (131).

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