Special signal cable for high speed railway
A technology for signal cables and high-speed railways. It is applied in the field of special signal cables for high-speed railways. It can solve problems such as the reduction of dielectric constant, the decrease of line transmission attenuation constant, and the impact on signal transmission quality, so as to save construction costs, reduce the line transmission attenuation constant, Easy to install and use
Inactive Publication Date: 2014-06-11
JIANGSU DONGQIANG
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"Modern Wired Transmission", No. 1, 1996, "Development of Physically Foamed Skin / Foam / Sheath Insulated Local Communication Cable (HYPA)" introduces a cable core wire insulation layer structure that has been applied to railway digital signal cables , because the insulating layer of the core wire structure has many dense and disconnected foam layers in the middle of the core and the outer skin, its dielectric constant is much lower than that of the solid-skin insulating layer, so that the line transmission The attenuation constant is greatly reduced. Therefore, this kind of leather / foam / skin high-speed railway special signal cable has better technical performance for transmitting high-frequency digital signals, but the transmission of railway signals not only has high-frequency signal transmission, but also includes such as crossing For the transmission of low-frequency signals such as signal lamps and turnout switch machine signals, due to the mutual interference between high-frequency signals and low-frequency signals in the co-cable transmission, it directly affects the transmission quality of the signals, and it has been difficult to realize the ideal high-frequency and low-frequency signals.
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[0016] figure 1 The cable core 6 of the shown high-speed railway special signal cable has 24 core wires, which are divided into five star-shaped four-wire groups, one pair wire group 4, and two insulated core wires 2; five star-shaped four-wire groups There are two shielded four-wire groups 1 with a shielding layer, three four-wire groups 3 without a shielding layer, and the pair of wire groups 4 and the insulated core wire 2 do not have a shielding layer. The structure of the shielded quad 1 is as follows figure 2 As shown, it includes four core wires 8, and the structure of the core wire 8 is that the insulating layer outside the core wire conductor 9 is a three-layer structure, which is a solid inner skin layer 14, a middle foam layer 13, and a solid outer skin layer from the inside to the outside 12. The shielding layer covering the four core wires is also a three-layer structure. It has the dual function of moisture insulation and insulation on the metal shielding layer...
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The invention discloses a special signal cable for a high speed railway. The special signal cable for the high speed railway comprises an outer protective layer and a cable core in the outer protective layer. Core wires in the cable core are divided into multiple wire sets. Insulating layers of the core wires are an inner solid cover layer, a middle foam layer and an outer solid cover layer in sequence from a conductor towards the outer side. The wire sets at least comprise one shielding quad and one quad without shielding layers. The shielding quad is composed of four core wires with shielding layers. The quad without the shielding layers is not provided with the shielding layers. The special signal cable for the high speed railway has the ideal comprehensive performances of being resistant to attenuation, interference and the like, capable of transmitting high-frequency railway signals and low-frequency railway signals simultaneously and multipurpose.
Description
technical field [0001] The invention relates to a high-speed railway special signal cable, in particular to a high-speed railway special signal cable with good high-frequency signal and low-frequency signal transmission compatibility. Background technique [0002] Existing special signal cables for high-speed railways mostly have an outer protective layer and a cable core inside the outer protective layer. The cable core is composed of core wires divided into several wire groups. The first insulating layer is a solid layer structure, which has a relatively high dielectric constant, which directly affects the anti-attenuation performance of the cable, especially when the cable transmits high-frequency signals. "Modern Wired Transmission", No. 1, 1996, "Development of Physically Foamed Skin / Foam / Sheath Insulated Local Communication Cable (HYPA)" introduces a cable core insulation layer structure that has been applied to railway digital signal cables , because the insulating l...
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IPC IPC(8): H01B7/00H01B7/17H01B7/02
Inventor 王子纯吴荣美陈子洪陈彩云徐亚东袁华侠于浜
Owner JIANGSU DONGQIANG