CN201048061Y - Magnetic suspension track traffic power cable - Google Patents

Abstract

The utility model relates to a magnetic suspension rail transit power cable, which includes a conductive body, an inner shielding layer, a crosslinked polyethylene insulation layer, an outer shielding layer and a round copper wire layer, wherein, the inner shielding layer is arranged outside the conductive body, and the crosslinked polyethylene insulation layer is arranged between the inner shielding layer and the outer shielding layer. The utility model is characterized in that a semi-conductive buffering resistivity water belt layer, and a resistivity water yarn layer, a double-sided resistivity water belt layer, a waterproof layer, an inner restrictive coating and an outer restrictive coating are respectively arranged outside the round copper wire layer. The utility model has the advantages of resistivity water characteristic in the long direction and the radial direction. The electric property corresponds with the request prescribed in a latest edition GB/T12706-2002 standard of the national standard.

Description

Maglev Rail Transit Power Cable

technical field

The utility model relates to a magnetic levitation rail transit power cable, which belongs to the technical field of power cables.

Background technique

Maglev rail transit power cables are laid on both sides of the viaduct line. Since the speed of the maglev train is extremely high, reaching over 450km/h, the requirements for the reliability and safety of the cables are naturally very high.

Compared with the power cables stipulated in the current national standard, the performance of maglev rail transit power cables is mainly different as follows:

(1) The halogen-free performance of the cable when burning should be able to meet the requirements of IEC60754-2, and the amount of HCl gas released during combustion should not exceed 5mg/g; the low-smoke performance of the cable should be able to meet the requirements of IEC61034-1/2 Under the specified conditions, the minimum light transmittance of the smoke concentration produced by combustion shall not be less than 60%; the mechanical, low-temperature tensile and high-temperature pressure properties of the cable halogen-free sheath shall meet IEC60811-1-1, IEC60811-1-4 and IEC60811 respectively - Relevant requirements in 3-1. Ordinary power cables do not have these regulations, and because polyvinyl chloride plastic is usually used as the outer sheath, it may pollute the environment when burned;

(2) When the rated voltage of the maglev rail transit power cable is 20kV, the partial discharge index is strictly required, that is, when the 2U ₀ voltage (24kV), the partial discharge cannot exceed 2pC. The current common power cable standard is at 1.73 U ₀ (20.8kV), the partial discharge is not greater than 10pC;

(3) The waterproof performance of the magnetic levitation rail transit power cable is relatively high: the cable is required to block water in the longitudinal and radial directions, while ordinary power cables do not have such requirements;

(4) Magnetic levitation rail transit power cables require a small control size deviation range, and their insulation eccentricity cannot exceed 8%, while ordinary power cables only have insulation eccentricity requirements for cables with a voltage level of 35kV, and the index is not greater than 15%. ;

Contents of the invention

The purpose of the utility model is to provide a magnetic levitation rail transit power cable whose electrical performance meets the national standard.

In order to achieve the above purpose, the technical solution of the utility model is to provide a magnetic levitation rail transit power cable, including a conductor, an inner shielding layer, a cross-linked polyethylene insulating layer, an outer shielding layer and a round copper wire layer, and an inner shielding layer is provided outside the conductor layer, a cross-linked polyethylene insulating layer is provided between the inner shielding layer and the outer shielding layer, and it is characterized in that a semi-conductive buffer water-blocking tape layer is arranged between the outer shielding layer and the round copper wire layer, and the round copper wire layer A water-blocking yarn layer, a double-sided water-blocking tape layer, a waterproof layer, an inner sheath layer and an outer sheath layer are arranged in sequence on the outside.

The double-sided water-blocking tape layer is a layer of double-sided water-blocking tape wrapped on the outside of the copper tape; the waterproof layer is a longitudinally wrapped aluminum-plastic composite tape; the inner sheath layer is a polyethylene layer; The outer sheath layer is a low-smoke, halogen-free, flame-retardant polyolefin plastic layer.

The utility model adopts the low-smoke halogen-free polyolefin flame-retardant sheath material to replace the PVC sheath material used in ordinary power cables, so that the halogen-free performance of the cable meets IEC60754-2 when the cable is burned, and the low-smoke performance of the cable meets IEC61034- 1/2, the mechanical performance, low temperature tensile performance and high temperature pressure performance of the cable halogen-free sheath should meet the relevant requirements in IEC60811-1-1, IEC60811-1-4 and IEC60811-3-1 respectively.

The radial water-blocking structure of the utility model adopts a longitudinally-wrapped aluminum-plastic composite belt, and at the same time extrudes a layer of polyethylene plastic or low-smoke halogen-free polyolefin plastic to form a waterproof inner protective layer; the vertical water-blocking is used on the relevant layers. For the corresponding water-blocking materials, water-blocking rope or water-blocking yarn is filled in places with gaps, and water-blocking tapes are used in places with wrapping tape layers. The internal energy can expand rapidly, and it has good compatibility with metal materials and other adjacent materials. The expansion increases the volume and blocks the voids, thereby preventing further moisture penetration in the longitudinal direction of the cable. Strictly operate according to the process. After each process is completed, it is necessary to take samples for inspection and water resistance test. Only after passing the test can it be transferred to the next process.

The utility model purchases high-quality ultra-clean cross-linked polyethylene insulating material, strictly controls the size deviation, so that the partial discharge at 2U ₀ voltage is not greater than 2pC.

The utility model has the advantages of:

1. The electrical performance of the utility model meets the requirements stipulated in the latest version of the national standard GB/T12706-2002;

2. The halogen-free performance of the sheath that conforms to the national standard for electrical performance should meet the minimum PH of 4.5 and the maximum conductivity of 10μS/mm specified in the IEC60754-2 standard. The low-smoke performance of the sheath should meet the requirements of IEC61034-1 /2 cable combustion smoke density test - the minimum light transmittance is 60%;

3. The longitudinal water resistance test of the cable has passed the water penetration test in the appendix of IEC60502.2.

Description of drawings

Figure 1 is a schematic diagram of the structure of the power cable for maglev rail transit.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

Example

As shown in Figure 1, it is a schematic structural diagram of a magnetic levitation rail transit power cable. The magnetic levitation rail transit power cable is composed of a conductor 1, an inner shielding layer 2, a cross-linked polyethylene insulating layer 3, an outer shielding layer 4 and a round copper wire layer 6 The conductor 1 is provided with an inner shielding layer 2, a cross-linked polyethylene insulating layer 3 is provided between the inner shielding layer 2 and the outer shielding layer 4, and a semi-conductive insulating layer is arranged between the outer shielding layer 4 and the round copper wire layer 6. Buffer water-blocking tape layer 5 is provided with water-blocking yarn layer 7, double-sided water-blocking tape layer 8, waterproof layer 9, inner sheath layer 10 and outer sheath layer 11 in sequence outside round copper wire layer 6.

The double-sided water-blocking tape layer 8 is a layer of double-sided water-blocking tape wrapped on the outside of the copper tape; the waterproof layer 9 is a longitudinally wrapped aluminum-plastic composite tape; the inner sheath layer 10 is a poly Vinyl layer; the outer sheath layer 11 is a low-smoke, halogen-free, flame-retardant polyolefin plastic layer.

The utility model will become a domestic new variety to replace imported magnetic suspension cables.

Claims (5)

1. A magnetic levitation rail transit power cable, comprising a conductor (1), an inner shielding layer (2), a cross-linked polyethylene insulating layer (3), an outer shielding layer (4) and a round copper wire layer (6), the conductor ( 1) An inner shielding layer (2) is arranged on the outside, and a cross-linked polyethylene insulating layer (3) is arranged between the inner shielding layer (2) and the outer shielding layer (4). It is characterized in that the outer shielding layer (4) A semi-conductive buffer water-blocking tape layer (5) is provided between the round copper wire layer (6), and a water-blocking yarn layer (7) and a double-sided water-blocking tape layer ( 8), waterproof layer (9), inner sheath layer (10) and outer sheath layer (11). 2. A magnetic levitation rail transit power cable according to claim 1, characterized in that, the double-sided water-blocking tape layer (8) is a layer of double-sided water-blocking tape wrapped on the outside of the copper tape. 3. A power cable for maglev rail transit according to claim 1, characterized in that the waterproof layer (9) is a longitudinally wrapped aluminum-plastic composite tape. 4. A magnetic levitation rail transit power cable according to claim 1, characterized in that, the inner sheath layer (10) is a polyethylene layer. 5. A magnetic levitation rail transit power cable according to claim 1, characterized in that the outer sheath layer (11) is a low-smoke, halogen-free, flame-retardant polyolefin plastic layer.