CN202443800U - High-voltage direct current power cable for rail transit - Google Patents

Abstract

The utility model discloses a high-voltage direct current power cable for rail transit. The high-voltage direct current power cable is characterized in that a plurality of soft copper wires are stranded to from a conductor, a conductor shielding layer, an insulated layer and an insulated shielding layer are extruded once on the conductor by a three-layer co-extrusion method to form an insulated wire core, an overlap lapping semi-conductive water-stop layer, a copper tape layer, a water-stop layer and a longitudinal lapping aluminum-plastic tape layer are sequentially arranged on an outer layer of the insulated wire core, and an inner sheath layer and an outer sheath layer made of low-smoke zero-halogen polyolefin plastics are respectively extruded on an outer layer of the aluminum-plastic tape layer respectively. The high-voltage direct current power cable has the advantages of flame resistance, low smoke, zero halogen, water proofing, rat and termite resistance, ultraviolet resistance and the like, and is adaptable to underground severe environments of rail transit.

Description

High-voltage DC power cables for rail transit

technical field

The utility model relates to a high-voltage direct-current power cable, in particular to a high-voltage direct-current power cable for rail transit, which belongs to the technical field of electric wires and cables.

Background technique

With the rapid development of my country's urban rail transit industry, the demand for rail transit cables is also increasing. According to statistics, in the next few years, more than 20 cities in my country will plan to build subways and light rails, with a total mileage of 1250km. By 2020, the total length of my country's rail transit lines will reach about 2200km. This is both an opportunity and a challenge for the wire and cable industry.

The rail transit power cables currently demanded by the market have developed from the low-smoke and low-halogen C-type flame retardant to the current low-smoke and halogen-free A-type flame retardant, and have additional features such as waterproof, anti-rat and ant, and anti-ultraviolet rays. The use of cables The system has AC and DC, and the voltage level is up to 26/35kV. Since the cable has many additional properties, the realization of these performance indicators will inevitably affect the mechanical and physical properties and processing properties of the material. Therefore, in order to achieve various performance indicators of the cable and make stable production, it is necessary to combine theory with practice in terms of cable structure, material performance selection and processing performance, and to be bold and innovative.

Contents of the invention

In order to overcome the defects of the prior art, the purpose of this utility model is to provide a high-voltage DC power cable for rail transit, which has the characteristics of flame retardancy, low smoke, halogen-free, waterproof, rodent-proof, anti-ultraviolet, etc. The severe environmental requirements of traffic underground.

The utility model adopts following technical scheme for solving technical problems:

The structural features of the high-voltage DC power cable for rail transit of the utility model are as follows: the conductor is formed by twisting multiple soft copper wires, and the conductor shielding layer, the insulating layer and the insulating shielding layer are formed by extruding the conductor shielding layer, the insulating layer and the insulating shielding layer at one time on the conductor. Insulated wire core, the outer layer of the insulated wire core is successively provided with overlapping wrapping semiconductive resistance water tape layer, copper tape layer, water blocking tape layer and longitudinally wrapped aluminum-plastic tape layer, and the outer layers of the aluminum-plastic tape layer are respectively An inner sheath layer made of low-smoke halogen-free polyolefin plastic and an outer sheath layer made of low-smoke halogen-free polyolefin plastic are extruded.

The structural features of the high-voltage DC power cable for rail transit of the utility model also lie in:

The insulating layer adopts chemically cross-linked polyethylene plastic or ethylene-propylene rubber.

The aluminum-plastic tape layer is a double-sided PE film aluminum-plastic composite tape with a thickness of 0.05-0.15 mm.

The inner sheath layer is made of extruded low-smoke, halogen-free polyolefin plastic that complies with the RoHS directive and has an oxygen index of not less than 34.

The outer sheath layer is made of extruded low-smoke, halogen-free polyolefin plastic that complies with the RoHS directive, has an oxygen index of not less than 30, contains environmentally friendly rodent repellent, and is UV-resistant.

The rated voltage of the utility model is 6-35kV.

Compared with the prior art, the beneficial effects of the utility model are reflected in:

1. The insulating layer of the utility model adopts chemically cross-linked polyethylene plastic or ethylene-propylene rubber mixture, the manufacturing process is mature, the product cost is reduced, and the performance is more stable and reliable;

2. The utility model adopts the aluminum-plastic tape longitudinal wrapping, and the inner sheath layer formed by extruding the front layer water-blocking tape and the rear layer together plays a waterproof role. Its comprehensive use makes the functions of waterproof, moisture-proof and water-blocking more prominent ;

3. The inner protective layer of the utility model adopts halogen-free polyolefin plastic with a relatively high oxygen index, so that the product can successfully pass the flame-retardant Class A combustion test;

4. The oxygen index of the inner and outer sheaths of the utility model is lower than that of the inner sheath. The purpose is to consider that the mechanical strength of the outer sheath meets the requirements of the standard. At the same time, the materials contain environmentally friendly rodent/termite repellents, ultraviolet light absorbers, and light shielding agents. etc., to meet the requirements of cable performance indicators.

Description of drawings

Figure 1 is a schematic diagram of the cable structure of the present invention.

In Figure 1: 1 conductor, 2 conductor shielding layer, 3 insulating layer, 4 insulating shielding layer, 5 semiconducting resistance water tape layer, 6 copper tape layer, 7 water blocking tape layer, 8 aluminum-plastic tape layer, 9 inner sheath layer, 10 outer sheath layers.

Below in conjunction with the accompanying drawings, the utility model will be further described through specific embodiments.

Detailed ways

The rated voltage is 10kV, and the insulation thickness is designed to be 4.5mm.

Referring to Figure 1, a conductor 1 is formed by twisting a plurality of annealed copper wires. On the conductor 1, a three-layer co-extrusion method is used to extrude the conductor shielding layer 2, the insulating layer 3 and the insulating shielding layer 4 to form an insulated wire core. The outer layer of the wire core is successively provided with an overlapping wrapping semiconductive resistance water tape layer 5, a copper tape layer 6, a water blocking tape layer 7 and a longitudinally wrapped aluminum-plastic tape layer 8, and the outer layers of the aluminum-plastic tape layer are respectively extruded and wrapped with low-smoke The inner sheath layer 9 made of halogen-free polyolefin plastic and the outer sheath layer 10 made of low-smoke halogen-free polyolefin plastic.

In specific implementation, the insulating layer 3 is made of chemically cross-linked polyethylene plastic YJ-10, or ethylene-propylene rubber DCJ30A; the aluminum-plastic tape layer 8 is a double-sided PE film aluminum-plastic composite tape with a thickness of 0.05 mm; the inner sheath layer 9 It is made of extruded low-smoke halogen-free polyolefin plastic CAB-5505 that complies with the RoHS directive and has an oxygen index of not less than 34; the outer sheath layer 10 is made of RoHS-compliant, with an oxygen index of not less than 30. Ultraviolet low-smoke halogen-free polyolefin plastic CAB-5505WRT is extruded.

In the implementation process, the aluminum-plastic tape layer 8 is produced by Suzhou Continental Electrical Materials Co., Ltd.; the inner sheath layer 9 and the outer sheath layer 10 are produced by Shanghai Kaibo Special Cable Material Factory.

Claims (4)

1. the high voltage dc power cable is used in a track traffic; It is characterized in that closing and constitute conductor (1) by many soft copper skein silks; Go up disposable conductor shield (2), insulating barrier (3) and the insulation screen (4) of extruding of the three-layer co-extruded method of employing at conductor (1) and form insulated wire cores; Set gradually overlapping wrapped semiconductive water blocking tape layer (5), copper strips layer (6), water blocking tape layer (7) and vertical alclad at the skin of said insulated wire cores and mould belt (8), extrude the inner restrictive coating (9) that the low-smoke halogen-free polyolefin plastics constitute and the external sheath layer (10) of low-smoke halogen-free polyolefin plastics formation respectively at the skin of plastic-aluminum belt.

2. the high voltage dc power cable is used in track traffic according to claim 1, it is characterized in that said insulating barrier (3) adopts processes for chemically crosslinked polyethylene plastics or ethylene-propylene rubber.

3. the high voltage dc power cable is used in track traffic according to claim 1, it is characterized in that it is the two-sided PE film aluminium-plastic tape of 0.05-0.15mm that said plastic-aluminum belt (8) adopts thickness.

4. the high voltage dc power cable is used in track traffic according to claim 1, it is characterized in that said inner restrictive coating (9) adopts to meet RoHS instruction, oxygen index and be not less than 34 low-smoke halogen-free polyolefin plastics and extrude and form.

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