Large current-carrying power cables
A power cable, large current carrying technology, applied in the field of wires, can solve the problems of large eddy current loss, limited wire carrying capacity, large wire loss, etc., to achieve the effect of improving current carrying capacity
Inactive Publication Date: 2016-04-20
STATE GRID CORP OF CHINA +2
View PDF5 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] For the above-mentioned shielding layer, the main problem is that the alternating current in the wire core will induce eddy current on the surface of the shielding layer. Due to the existence of this kind of eddy current, the carrying capacity of the wire is greatly limited. The greater the flow, the greater the eddy current loss; therefore, the current shielded wire has a larger line loss during the current carrying process
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0022] Below in conjunction with accompanying drawing and embodiment the present invention is further described:
[0023] Such as figure 1 , figure 2 As shown, the power cable includes a core 1 , an inner insulating layer 2 , a shielding layer 3 , and a protective layer 4 from inside to outside.
[0024] The shielding layer 3 is divided into three layers, which are respectively an inner spiral layer 31, an isolation film 30, and an outer spiral layer 32 from the inside to the outside; the surfaces of the inner spiral layer 31 and the outer spiral layer 32 have straight spiral A linear metal path with insulating gaps between adjacent turns of the straight spiral metal path; e.g. image 3 As shown, the insulating gap 310 between the metal paths 311 of the inner spiral layer 31 just faces the metal path 321 of the outer spiral layer 32 in the radial direction; similarly, the outer spiral layer 32 The insulating gap 320 between the metal paths 321 is exactly opposite to the me...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
| Property | Measurement | Unit |
|---|---|---|
| thickness | aaaaa | aaaaa |
Login to View More
Abstract
The invention provides a large current-carrying power cable, which includes a core, an inner insulating layer, a shielding layer, and a protective layer from the inside to the outside; the shielding layer is divided into three layers, which are respectively inner and outer spiral layer, isolation film, outer spiral layer; the surface of the inner spiral layer and the outer spiral layer has a straight spiral metal path, and there is an insulating gap between adjacent turns of the straight spiral metal path, The insulating gap between the metal paths of the inner helical layer is exactly opposite to the metal path of the outer helical layer in the radial direction. The power cable not only has a good shielding effect, but also has a small eddy current loss, which is suitable for large current-carrying operations.
Description
technical field [0001] The invention relates to the field of wires, in particular to a large current-carrying power cable. Background technique [0002] In the field of power cables, especially for wires with information transmission function, in order to prevent external interference and suppress radiation leakage of the wire core, it is usually necessary to wrap at least one layer of metal shielding layer outside the wire core; through the shielding layer The setting can effectively prevent the external environmental electromagnetic waves from affecting the current signal in the core, and also reduce the external radiation of the alternating current in the core. [0003] There are mainly two types of shielding layers, one is a wire mesh interwoven with metal wires, and the other is a thin-walled tubular metal; Metal thin wall. [0004] For the above-mentioned shielding layer, the main problem is that the alternating current in the wire core will induce eddy current on th...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H01B9/02H01B13/00
CPCH01B9/02H01B9/024H01B13/00H01B13/14H01B13/143H01B13/165
Inventor 贺青李庆庆张敏王健张捷
Owner STATE GRID CORP OF CHINA