Mobile cable for 15kV mining frequency conversion device

Abstract

The invention relates to the technical field of wires and cables, in particular to a mobile cable for a 15KV mining frequency conversion device, which comprises a cable core, a total shielding layer and a sheath layer, the cable core comprises a power wire core, a ground wire core and a detection wire core, and gaps among the power wire core, the ground wire core and the detection wire core are filled with magnetic conductive fibers. The power wire core, the ground wire core, the detection wire core and the magnetic conductive fiber are mutually twisted; and the total shielding layer wraps the outer side of the cable core. The cable has the advantage of being capable of preventing harmonic interference and radio frequency interference.

Description

Technical Field

[0001] The present application relates to the technical field of wires and cables, and in particular to a mobile cable for a mine-used frequency conversion device. Background Art

[0002] Currently, with the development of modern science and technology and the requirements of the country for energy consumption, energy conservation and environmental protection, etc., more and more engineering equipment motors have been replaced from ordinary motors to frequency conversion motors. However, the resulting electromagnetic interference problems have gradually attracted the attention of practitioners.

[0003] The existing Chinese patent with the authorized publication number of CN118762868A mentions a frequency conversion cable for an intelligent 10kV medium-voltage coal mine frequency conversion device, which solves the problem that the copper wire braided layer between the inner and outer sheaths is easy to wear. However, there are still problems such as harmonic interference and radio frequency interference during the operation of the frequency conversion equipment, and the normal and stable operation of the equipment cannot be guaranteed. Summary of the Invention

[0004] In order to improve the harmonic interference and radio frequency interference problems existing during the operation of the frequency conversion equipment, the present application provides a mobile cable for a 15KV mine-used frequency conversion device.

[0005] The mobile cable for a 15KV mine-used frequency conversion device provided by the present application adopts the following technical solutions:

[0006] A mobile cable for a 15KV mine-used frequency conversion device includes a cable core, a total shielding layer and a sheath layer. The cable core includes a power core, a ground core and a detection core. The gaps between the power core, the ground core and the detection core are filled with magnetic conductive fibers, and the power core, the ground core, the detection core and the magnetic conductive fibers are twisted together; the total shielding layer is wrapped outside the cable core.

[0007] Preferably, there are three power cores, including a three-layer co-extruded insulated core. A first copper foil is wound and coated outside the three-layer co-extruded insulated core. A metal braided layer is coated outside the first copper foil. The copper surface of the first copper foil faces the metal braided layer. An aluminum foil is coated outside the metal braided layer. The aluminum surface of the aluminum foil faces the metal braided layer; the wrapping and overlapping rates of the first copper foil and the aluminum foil are both greater than 20%.

[0008] Preferably, the ground core is formed by bunch-stranding electrolytic copper, and the total cross-sectional area of the ground wire is greater than 1 / 2 of the cross-sectional area of a single power wire.

[0009] Preferably, the detection core includes a detection core conductor and a detection core insulation layer.

[0010] Preferably, the total shielding layer includes a second copper foil, copper wires and iron wires, and the copper wires and the iron wires are woven and coated bidirectionally outside the second copper foil.

[0011] Preferably, the material of the sheath layer is one of chlorinated polyethylene, chloroprene rubber, TPU or EVM rubber.

[0012] In summary, the present application includes at least one of the following beneficial technical effects:

[0013] 1. In the present application, a layer of copper foil is first wound around the three-layer co-extruded core, then a copper wire shielding layer is braided, and finally an aluminum foil is wound. This structure greatly improves the shielding coverage effect, effectively shields the harmonic interference generated by the frequency converter, and improves the safety of the internal control and communication components of the cable and equipment. Compared with ordinary high-voltage cables, the shielding efficiency of the high-voltage frequency conversion cable of the present application is greatly improved, with the transfer impedance reduced by about 50% and the shielding attenuation increased by one order of magnitude.

[0014] 2. In the present application, a copper foil is added to the total shielding layer to improve the anti-interference effect. At the same time, the braided layer adopts a two-way braiding method of iron wire and copper wire. The copper wire solves the problem of electric field interference of high-voltage cables, and the iron wire has excellent magnetic conductivity to solve the problem of magnetic field interference. This combined shielding method can effectively block the interference of external electromagnetic waves on internal signals, and at the same time prevent internal signals from radiating outward, avoiding interference with other equipment, ensuring the stability and accuracy of data transmission, and reducing signal distortion and error rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of a 15KV mobile cable for a mine frequency conversion device in an embodiment of the present application.

[0016] Description of the reference numerals: 1, ground wire core; 2, power wire core; 21, three-layer co-extruded insulated wire core; 22, first copper foil; 23, metal braided layer; 24, aluminum foil; 3, detection wire core; 31, detection wire core conductor; 32, detection wire core insulation layer; 4, magnetostrictive fiber; 5, total shielding layer; 6, sheath layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The following is a further detailed description of the present application in conjunction with the attached Figure 1 drawings.

[0018] An embodiment of the present application discloses a 15KV mobile cable for a mine frequency conversion device. Referring to Figure 1 , the cable includes a cable core, a total shielding layer 5 and a sheath layer 6. The cable core includes a power wire core 2, a ground wire core 1 and a detection wire core 3. The gaps between the power wire core 2, the ground wire core 1 and the detection wire core 3 are filled with magnetostrictive fibers 4, and the power wire core 2, the ground wire core 1, the detection wire core 3 and the magnetostrictive fibers 4 are twisted together; the total shielding layer 5 is wrapped outside the cable core.

[0019] Referring to Figure 1, there are three power cores 2, including a three-layer co-extruded insulated core 21. A first copper foil 22 is wound around the three-layer co-extruded insulated core 21. A metal braided layer 23 is coated on the outer side of the first copper foil 22. The metal braided layer 23 is a copper wire braided layer. The copper surface of the first copper foil 22 faces the metal braided layer 23. An aluminum foil 24 is coated on the outer side of the metal braided layer 23. The aluminum surface of the aluminum foil 24 faces the metal braided layer 23 and is in contact with the metal braided layer 23. The overlapping rates of the first copper foil 22 and the aluminum foil 24 in the wrapping are both greater than 20%. The ground core 1 is formed by stranding electrolytic copper bundles, and the total cross-sectional area of the ground wire is greater than 1 / 2 of the cross-sectional area of a single power wire. The detection core 3 includes a detection core 3 conductor and a detection core 3 insulation layer.

[0020] Refer to Figure 1 , the total shielding layer 5 includes a second copper foil, copper wires and iron wires, and the copper wires and iron wires are woven bidirectionally and coated on the outer side of the second copper foil. The material of the sheath layer 6 is one of chlorinated polyethylene, chloroprene rubber, TPU or EVM rubber. In this embodiment, the sheath layer 6 is a chloroprene rubber sheath.

[0021] The above are all the preferred embodiments of this application, and the protection scope of this application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape and principle of this application should be covered within the protection scope of this application.

Claims

1. A mobile cable for a 15KV mine frequency conversion device, comprising a cable core, a total shielding layer (5) and a sheath layer (6), characterized in that: The cable core includes a power core (2), a ground core (1) and a detection core (3). The gaps between the power core (2), the ground core (1) and the detection core (3) are filled with magnetically conductive fibers (4). The power core (2), the ground core (1), the detection core (3) and the magnetically conductive fibers (4) are twisted together; the overall shielding layer (5) is wrapped outside the cable core.

2. The mobile cable for a 15KV mine use frequency conversion device according to claim 1, wherein: There are three power cores (2), including a three-layer co-extruded insulated core (21). A first copper foil (22) is wound around the outside of the three-layer co-extruded insulated core (21). A metal braided layer (23) is wrapped outside the first copper foil (22). The copper surface of the first copper foil (22) faces the metal braided layer (23). An aluminum foil (24) is wrapped outside the metal braided layer (23). The aluminum surface of the aluminum foil (24) faces the metal braided layer (23); the overlapping rates of winding of the first copper foil (22) and the aluminum foil (24) are both greater than 20%.

3. A mobile cable for a 15KV mine use frequency conversion device according to claim 1, characterized in that: The ground core (1) is formed by bunch-stranding electrolytic copper, and the total cross-sectional area of the ground wire is greater than 1 / 2 of the cross-sectional area of a single power wire.

4. The mobile cable for a 15KV mine-used frequency conversion device according to claim 1, characterized in that: The detection core (3) includes a detection core (3) conductor and a detection core (3) insulation layer.

5. The mobile cable for a 15KV mine use frequency conversion device according to claim 1, characterized in that: The overall shielding layer (5) includes a second copper foil, copper wires and iron wires. The copper wires and iron wires are woven and wrapped bidirectionally outside the second copper foil.

6. A mobile cable for a 15KV mine use frequency conversion device according to claim 1, characterized in that: The material of the sheath layer (6) is one of chlorinated polyethylene, chloroprene rubber, TPU or EVM rubber.

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