CN214847887U

CN214847887U - High-frequency feed cable

Info

Publication number: CN214847887U
Application number: CN202121243089.6U
Authority: CN
Inventors: 张航; 李子欣; 高范强; 徐飞; 赵聪; 王平; 李耀华; 史黎明
Original assignee: Institute of Electrical Engineering of CAS
Current assignee: Institute of Electrical Engineering of CAS
Priority date: 2021-06-04
Filing date: 2021-06-04
Publication date: 2021-11-23
Anticipated expiration: 2031-06-04

Abstract

A high-frequency feed cable comprises a litz wire conductor (1), a bare copper wire conductor (2), a conductor shielding layer (3), an insulating layer (4), an insulating shielding layer (5), a metal shielding layer (6), a sheath (7) and a protective layer (8); the center of the high-frequency feed cable is a litz wire conductor (1), and a bare copper wire conductor (2) wraps the periphery of the litz wire conductor (1); the conductor shielding layer (3), the insulating layer (4) and the insulating shielding layer (5) are sequentially arranged and extruded and coated on the periphery of the bare copper conductor (2) in a three-layer co-extrusion mode; the metal shielding layer (6) is wrapped on the periphery of the insulating shielding layer (5) in a tin-plated copper monofilament weaving mode; a sheath (7) is wrapped on the periphery of the metal shielding layer (6); the periphery of the sheath (7) is wrapped with a protective layer (8). Compare with current medium voltage feeder cable, the utility model discloses when guaranteeing high power supply quality, can effectively reduce the pressure drop of circuit unit length.

Description

High-frequency feed cable

Technical Field

The utility model relates to a high frequency feeder cable.

Background

In recent years, with the rapid development of the economy of China, the transportation industry in China is also developed vigorously. In the summary of the national long-term scientific and technical development plan (2006-2020) (hereinafter referred to as "outline"), it is explicitly pointed out that "high-speed rail transit system" is listed as one of the main development subjects of innovation in the field of "transportation industry". Since the implementation of the compendium, China makes important breakthrough and development in the aspects of high-speed motor train unit construction and magnetic levitation technology.

The feed cable is an important component of the high-speed motor car system power supply, and can provide important guarantee for the electric energy driving of the high-speed motor car. However, since the operating frequency of a high-speed motor car is higher than the power frequency of a power grid during operation, a conventional feeder cable designed at the power frequency is affected by skin effect, and the voltage loss of the line is relatively high, so that the voltage transmitted to a motor car driving system is lower than the rated operating voltage. To eliminate this effect, the line voltage drop can be reduced using multiple cables in parallel or using litz wire schemes designed at high frequencies. However, the scheme of parallel connection of a plurality of cables undoubtedly increases the system cost, although the litz wire scheme can reduce the line voltage drop, the litz wire is internally stranded with a plurality of strands of enameled wires, for high-voltage and high-power application occasions, the scheme has a relatively thick joint, the enameled wires at the joint part need to be treated by chemical coatings harmful to human bodies, and the joint part needs to be filled with tin to ensure good line contact after treatment, so that the manufacturing process is relatively complex.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art shortcoming, provide a high frequency feeder cable. The utility model discloses high tension cable's conductor part is formed by litz wire and stranded tinned bare copper wire stranding for the unit length line voltage drop when reducing medium voltage high frequency and using. During use, current will flow through the litz wire and the bare copper wire conductor, respectively. Compare with pure litz wire or pure stranded bare copper cable scheme, the utility model discloses when reducing the cable pressure drop, can effectively reduce the complexity of cable joint preparation.

The high-frequency feed cable comprises a litz wire conductor, a bare copper wire conductor, a conductor shielding layer, an insulating shielding layer, a metal shielding layer, a sheath and a protective layer; the center of the high-frequency feed cable is a litz wire conductor, and the bare copper wire conductor is wrapped on the periphery of the litz wire conductor; the conductor shielding layer, the insulating layer and the insulating shielding layer are concentric and arranged in sequence, and are extruded and coated on the periphery of the bare copper conductor in a three-layer co-extrusion mode; the metal shielding layer is formed by weaving tin-plated copper monofilaments and is coated on the periphery of the insulating shielding layer; a sheath is wrapped on the periphery of the metal shielding layer; and a protective layer is wrapped on the periphery of the sheath.

The litz wire conductor is formed by twisting a plurality of enameled wires with the monofilament diameter of 0.1-0.3 mm, and the effective sectional area of the litz wire conductor is less than or equal to 100mm²(ii) a Bundling tin-plated copper fine wires with the diameter of 0.3 mm-0.5 mm into a single-stranded bare copper wire conductor, then wrapping a litz wire conductor with a plurality of strands of bare copper wire conductors in a wrapping mode to form the bare copper wire conductor, wherein the effective sectional area of the bare copper wire conductor is less than or equal to 300mm²。

The conductor shielding layer and the insulation shielding layer of the high-frequency feed cable are made of semi-conductive materials. The insulating layer and the sheath layer are made of ethylene propylene rubber, silicon rubber or cross-linked polyethylene materials. The protective layer is woven by polyester fiber or Kevlar fiber materials.

Compared with the prior art, the utility model discloses high frequency feed cable has combined the advantage of litz line and stranded copper strands, has the characteristics that the circuit pressure reduces and simple manufacture.

Drawings

Fig. 1 is a schematic cross-sectional view of the high-frequency feeder cable according to the present invention.

Detailed Description

The invention is further described below with reference to the accompanying drawings and the detailed description.

As shown in fig. 1, the high-frequency feeder cable of the present invention includes a litz wire conductor 1, a bare copper wire conductor 2, a conductor shielding layer 3, an insulating layer 4, an insulating shielding layer 5, a metal shielding layer 6, a sheath 7, and a protective layer 8; the center of the high-frequency feed cable is a litz wire conductor 1, and the naked copper wire conductor 2 is wrapped on the periphery of the litz wire conductor 1; the conductor shielding layer 3, the insulating layer 4 and the insulating shielding layer 5 are sequentially concentrically arranged and extruded and coated on the periphery of the bare copper conductor 2 in a three-layer co-extrusion mode; the metal shielding layer 6 is wrapped on the periphery of the insulating shielding layer 5 in a tin-plated copper monofilament weaving mode; a sheath 7 is wrapped on the periphery of the metal shielding layer 6; and a protective layer 8 is wrapped on the periphery of the sheath 7.

The litz wire conductor 1 is formed by twisting a plurality of enameled wires with the monofilament diameter of 0.1-0.3 mm, and the effective sectional area of the litz wire conductor 1 is less than or equal to 100mm²(ii) a Bundling tin-plated copper fine wires with the diameter of 0.3 mm-0.5 mm into a single-stranded bare copper wire conductor, then wrapping a plurality of strands of bare copper wire conductors 1 by wrapping to form a bare copper wire conductor 2, wherein the effective sectional area of the bare copper wire conductor 2 is less than or equal to 300mm²。

The conductor shielding layer 3 and the insulation shielding layer 5 of the high-frequency feed cable are made of semi-conductive materials. The insulating layer 4 and the sheath 7 are made of ethylene propylene rubber, silicon rubber or cross-linked polyethylene. The protective layer 8 is woven by polyester fiber or Kevlar fiber material.

Claims

1. A high-frequency feed cable is characterized by comprising a litz wire conductor (1), a bare copper wire conductor (2), a conductor shielding layer (3), an insulating layer (4), an insulating shielding layer (5), a metal shielding layer (6), a sheath (7) and a protective layer (8); the center of the high-frequency feed cable is a litz wire conductor (1), and the bare copper wire conductor (2) is wrapped on the periphery of the litz wire conductor (1); the conductor shielding layer (3), the insulating layer (4) and the insulating shielding layer (5) are concentric and arranged in sequence, and are extruded and coated on the periphery of the bare copper conductor (2) in a three-layer co-extrusion mode; the metal shielding layer (6) is wrapped on the periphery of the insulating shielding layer (5) in a tinned copper monofilament weaving mode; a sheath (7) is wrapped on the periphery of the metal shielding layer (6); and a protective layer (8) is wrapped on the periphery of the sheath (7).

2. The high-frequency feeder cable according to claim 1, characterized in that: the litz wire conductor (1) is formed by stranding a plurality of strands of monofilament enameled wires with the diameter of 0.1-0.3 mm, and the effective sectional area of the litz wire conductor (1) is less than or equal to 100mm²。

3. The high-frequency feeder cable according to claim 1, characterized in that: bundling tin-plated copper fine wires with the diameter of 0.3 mm-0.5 mm into a single-stranded bare copper wire conductor, and then wrapping a litz wire conductor (1) by a multi-stranded bare copper wire conductor in a wrapping manner to form a bare copper wire conductor (2); the effective sectional area of the bare copper wire conductor (2) is less than or equal to 300mm²。

4. The high-frequency feeder cable according to claim 1, characterized in that: the shielding layer (3) and the insulating shielding layer (5) are made of semiconductive materials, and the thickness of the semiconductive materials is 0.5-1 mm; the insulating layer (4) and the sheath (7) are made of ethylene propylene rubber, silicon rubber or cross-linked polyethylene materials, and the thickness of the insulating material is 3.5 mm-5.5 mm; the protective layer (8) is woven by polyester fiber or Kevlar fiber materials.