A polypropylene insulated cable for frequency conversion systems

Abstract

This utility model relates to the field of cable technology, specifically to a polypropylene insulated frequency converter cable, including a first conductive core. A reinforcing device is provided on the surface of the first conductive core. From the inside out, the reinforcing device includes a conductive shielding layer, a first insulation layer, an insulating shielding layer, a metal shielding layer, and a second conductive core. This utility model, by incorporating the reinforcing device, allows for the installation of the conductor shielding layer, the first insulation layer, and the insulating shielding layer on the cable. These layers are co-extruded, significantly reducing the eccentricity between the cable insulation and the inner and outer shields. The inner and outer shields are tightly bonded to the first insulation layer, improving the partial discharge and breakdown levels of the cable. The cable also includes a second insulation layer, a filler layer, wrapping tape, an inner sheath layer, a metal sheath layer, and an outer sheath layer. This design offers advantages such as high breakdown field strength, minimal change in dielectric constant and dielectric loss with temperature, a maximum allowable long-term operating temperature of 105℃, and the elimination of the need for cross-linking, thus extending service life.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, and in particular to a polypropylene insulated cable for a frequency conversion system. Background Technology

[0002] A cable is a flexible conductor consisting of one or more mutually insulated conductors encased in an insulating layer and a protective sheath, used for transmitting electrical energy, electrical signals, or converting electromagnetic energy. It is widely used in power transmission, communications, industrial control, building wiring, and other applications, serving as the "blood vessels" of modern power and information systems.

[0003] When workers need to transmit electrical signals, they connect the signals to the equipment so that the cable can deliver the signals to the designated location. However, existing cables are usually protected by a single conductor with an outer insulation layer and a protective sheath. This can lead to a reduction in the cable's lifespan due to high temperatures or compression during use. Utility Model Content

[0004] The purpose of this invention is to solve the problem of reduced service life of cables in the prior art, and to propose a polypropylene insulated cable for frequency conversion systems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a polypropylene insulated frequency converter cable, comprising a first conductive core, the surface of which is provided with a reinforcing device, the reinforcing device comprising, from the inside out, a conductive shielding layer, a first insulation layer, an insulation shielding layer, a metal shielding layer, a second conductive core, a second insulation layer, a filling layer, a wrapping tape, an inner sheath layer, a metal sheath layer, and an outer sheath layer, the first insulation layer, the insulation shielding layer, and the second insulation layer being made of polypropylene material, the surface of which is provided with a conductor shielding layer, the conductor shielding layer being made of a high-voltage power cable-specific semi-conductive shielding material, the conductor shielding layer being able to cooperate with the first conductive core to achieve the purpose of protecting the first conductive core.

[0006] Preferably, the surface of the conductor shielding layer is provided with a first insulating layer, which is located on one side of the first conductive core. The first insulating layer can cooperate with the conductor shielding layer and the first conductive core to achieve the purpose of protecting the first conductive core.

[0007] Preferably, an insulating shielding layer is provided on the surface of the first insulating layer. The insulating shielding layer is a semi-conductive shielding material specifically for high-voltage power cables. The insulating shielding layer can work in conjunction with the first insulating layer to reduce signal interference.

[0008] Preferably, a metal shielding layer is disposed on the surface of the insulating shielding layer, the metal shielding layer is located on one side of the first conductive core, a filling layer is disposed on the surface of the first conductive core, a second conductive core is disposed on one side of the first conductive core, a second insulating layer is disposed on the surface of the second conductive core, the second insulating layer is disposed inside the filling layer, and the metal shielding layer can cooperate with the insulating shielding layer to achieve the purpose of protecting the first conductive core.

[0009] Preferably, the surface of the filler layer is provided with a wrapping tape, the wrapping tape is located on one side of the first conductive core, the surface of the wrapping tape is provided with an inner sheath layer, the surface of the inner sheath layer is provided with a metal sheath layer, the metal sheath layer is an argon arc welded corrugated copper tube, the wrapping tape is made of polyester tape, the metal sheath layer can cooperate with the inner sheath layer to achieve the purpose of protecting the first conductive core, and the inner sheath layer is a low smoke halogen-free polyolefin sheath.

[0010] Preferably, an outer sheath layer is provided on the surface of the metal sheath layer. The outer sheath layer is located on one side of the first conductive core. The outer sheath layer can cooperate with the metal sheath layer to achieve the purpose of protecting the metal sheath layer. The outer sheath layer is a low-smoke halogen-free polyolefin sheath.

[0011] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0012] 1. In this utility model, by setting up a strengthening device, the operator installs a conductor shielding layer, a first insulation layer, and an insulation shielding layer on the cable. These are three layers co-extruded, which greatly reduces the eccentricity of the cable insulation and the inner and outer shields. The inner and outer shields and the first insulation layer are tightly bonded, improving the partial discharge and breakdown level of the cable product. The operator installs a second insulation layer, a filler layer, a wrapping tape, an inner sheath layer, a metal sheath layer, and an outer sheath layer on the cable. This has the advantages of high breakdown field strength, less change in dielectric constant and dielectric loss with temperature, a maximum allowable long-term operating temperature of 105℃, no need for cross-linking, and improved service life. Attached Figure Description

[0013] Figure 1 This utility model provides a three-dimensional structural diagram of a polypropylene insulated cable for a frequency conversion system.

[0014] Figure 2 This utility model provides a bottom view structural diagram of a polypropylene insulated cable for a frequency conversion system;

[0015] Figure 3 This utility model provides a front view structural diagram of a polypropylene insulated cable for a frequency conversion system;

[0016] Figure 4 This utility model provides a cross-sectional structural diagram of a polypropylene insulated cable for a frequency conversion system.

[0017] Figure 5 This utility model proposes a polypropylene insulated cable for frequency conversion systems. Figure 4 Enlarged structural diagram at point A in the middle.

[0018] Legend:

[0019] 1. First conductive core; 2. Conductor shielding layer; 3. First insulation layer; 4. Insulation shielding layer; 5. Metal shielding layer; 6. Second conductive core; 7. Second insulation layer; 8. Filler layer; 9. Wrapping tape; 10. Inner sheath layer; 11. Metal sheath layer; 12. Outer sheath layer. Detailed Implementation

[0020] Please see Figures 1-5 This utility model provides a technical solution: a polypropylene insulated frequency converter cable, including a first conductive core 1, the surface of which is provided with a reinforcing device.

[0021] The specific setup and function of its strengthening device will be explained in detail below.

[0022] In this embodiment, the strengthening device includes, from the inside out, a conductive shielding layer, a first insulating layer 3, an insulating shielding layer 4, a metal shielding layer 5, a second conductive wire core 6, a second insulating layer 7, a filling layer 8, a wrapping tape 9, an inner sheath layer 10, a metal sheath layer 11, and an outer sheath layer 12. The first insulating layer 3, the insulating shielding layer 4, and the second insulating layer 7 are all made of polypropylene.

[0023] Specifically, a conductor shielding layer 2 is provided on the surface of the first conductive core 1. The material of the conductor shielding layer 2 is a semi-conductive shielding material for high-voltage power cables. The conductor shielding layer 2 can cooperate with the first conductive core 1 to achieve the purpose of protecting the first conductive core 1.

[0024] Specifically, a first insulating layer 3 is provided on the surface of the conductor shielding layer 2, and the first insulating layer 3 is located on one side of the first conductive core 1.

[0025] In this embodiment, the first insulating layer 3 can cooperate with the conductor shielding layer 2 and the first conductive core 1 to achieve the purpose of protecting the first conductive core 1.

[0026] In this embodiment: an insulating shielding layer 4 is provided on the surface of the first insulating layer 3. The insulating shielding layer 4 is a semi-conductive shielding material for high-voltage power cables. The insulating shielding layer 4 can cooperate with the first insulating layer 3 to reduce signal interference.

[0027] Specifically, a metal shielding layer 5 is provided on the surface of the insulating shielding layer 4. The metal shielding layer 5 is located on one side of the first conductive core 1. A filling layer 8 is provided on the surface of the first conductive core 1. A second conductor core is provided on one side of the first conductive core 1. A second insulating layer 7 is provided on the surface of the second conductor core. The second insulating layer 7 is located inside the filling layer 8.

[0028] In this embodiment, the metal shielding layer 5 can cooperate with the edge shielding layer to achieve the purpose of protecting the first conductive core 1.

[0029] Specifically, the surface of the filler layer 8 is provided with a wrapping tape 9, which is located on one side of the first conductive core 1. The surface of the wrapping tape 9 is provided with an inner sheath layer 10, and the surface of the inner sheath layer 10 is provided with a metal sheath layer 11. The metal sheath layer 11 is an argon arc welded corrugated copper tube. The material of the wrapping tape 9 is polyester tape. The metal sheath layer 11 can cooperate with the inner sheath layer 10 to achieve the purpose of protecting the first conductive core 1. The inner sheath layer 10 is a low smoke halogen-free polyolefin sheath.

[0030] Specifically, an outer sheath layer 12 is provided on the surface of the metal sheath layer 11, and the outer sheath layer 12 is located on one side of the first conductive core 1.

[0031] In this embodiment: the outer sheath layer 12 can cooperate with the metal sheath layer 11 to achieve the purpose of protecting the metal sheath layer 11. The outer sheath layer 12 is a low-smoke halogen-free polyolefin sheath.

[0032] Working principle: By setting up a strengthening device, the main conductor core is formed by extruding a conductor shielding layer 2, a first insulation layer 3, and an insulation shielding layer 4 onto the conductive conductor core. A three-layer co-extrusion process is used to complete the extrusion of the conductor shielding layer 2, the first insulation layer 3, and the insulation shielding layer 4 in one step, which can improve the overall performance of the insulation and ensure the cable's voltage drop and phase-to-phase interference resistance. A copper tape metal shielding layer 5 is wrapped around the insulation shielding layer 4 to form the main conductor core. The grounding conductor core is formed by extruding a second insulation layer 7 onto the conductive conductor core. The cable cores are symmetrically distributed with the main conductor cores and grounding conductor cores in a "3+3" staggered arrangement. The filling layer 8 is filled with polypropylene tear-mesh rope, and polyester tape 9 is used as a wrapping tape on the outside of the cable core. The inner sheath layer 10, low-smoke halogen-free polyolefin, is produced by extrusion. The metal sheath layer 11, argon-arc welded corrugated copper tube, is produced by longitudinal wrapping. Finally, a low-smoke halogen-free polyolefin outer sheath layer 12 is extruded.

Claims

1. A polypropylene insulated cable for a frequency conversion system, comprising a first conductive core (1), characterized in that: The surface of the first conductive core (1) is provided with a reinforcing device; The strengthening device includes, from the inside out, a conductive shielding layer, a first insulating layer (3), an insulating shielding layer (4), a metal shielding layer (5), a second conductive wire core (6), a second insulating layer (7), a filling layer (8), a wrapping tape (9), an inner sheath layer (10), a metal sheath layer (11), and an outer sheath layer (12). The first insulating layer (3), the insulating shielding layer (4), and the second insulating layer (7) are all made of polypropylene.

2. The polypropylene insulated power cable for variable frequency system according to claim 1, characterized in that: The surface of the first conductive core (1) is provided with a conductor shielding layer (2), and the material of the conductor shielding layer (2) is a semi-conductive shielding material for high voltage power cables.

3. The polypropylene insulated power cable for variable frequency system according to claim 2, characterized in that: The surface of the conductor shielding layer (2) is provided with a first insulating layer (3), which is located on one side of the first conductive core (1).

4. The polypropylene insulated power cable for variable frequency system according to claim 3, characterized in that: An insulating shielding layer (4) is provided on the surface of the first insulating layer (3), and the insulating shielding layer (4) is a special semi-conductive shielding material for high voltage power cables.

5. The polypropylene insulated power cable for variable frequency system according to claim 4, characterized in that: The surface of the insulating shielding layer (4) is provided with a metal shielding layer (5), the metal shielding layer (5) is located on one side of the first conductive core (1), the surface of the first conductive core (1) is provided with a filling layer (8), a second conductor core is provided on one side of the first conductive core (1), the surface of the second conductor core is provided with a second insulating layer (7), and the second insulating layer (7) is located inside the filling layer (8).

6. The polypropylene insulated power cable for variable frequency system according to claim 5, characterized in that: The surface of the filling layer (8) is provided with a wrapping tape (9), the wrapping tape (9) is located on one side of the first conductive wire core (1), the surface of the wrapping tape (9) is provided with an inner sheath layer (10), the surface of the inner sheath layer (10) is provided with a metal sheath layer (11), and the metal sheath layer (11) is an argon arc welded corrugated copper tube.

7. The polypropylene insulated power cable for variable frequency system according to claim 6, characterized in that: The surface of the metal sheath layer (11) is provided with an outer sheath layer (12), which is located on one side of the first conductive core (1).

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