Anti-tracking internal shield railway digital signal cable

Abstract

A tracking resistance internal shield railway digital signals cable includes cable core having multi - group signal wire, at least a group of signal wire being internal shield four line set, said each signal wire outer side covered with polyester strip layer, said polyester strip outer side longitudinal coated with aluminum plastics compound strip, said aluminum plastics compound strip outer side set with tracking resistance sheath layer, said tracking resistance sheath layer anti tracking polyethylene plastics material. Said tracking resistance sheath layer has high insulation grade, strong withstand voltage ability, capable of raising whole cable anti-interference and electrocorrosion proof ability, making said cable crossing operation with high voltage network, in favor of raising railway digital communication safe reliability, prolonging internal shield railway digital signals cable service life, convenient for construction and installation without power cut operation.

Description

technical field [0001] The invention relates to an inner shielded railway digital signal cable. Background technique [0002] In the prior art, an inner shielded railway digital signal cable includes a cable core, an aluminum-plastic composite tape longitudinally wrapped around the outer side of the cable core, and has at least one inner shielded quad-wire in the cable core. In practical application, this kind of cable has poor resistance to electrical interference. If it is installed overhead in the strong electric field environment of high-voltage transmission lines, the potential generated by the capacitive coupling between the cable, the high-voltage phase line and the ground will be generated on the surface of the cable. Different potentials lead to potential difference. The potential difference will cause leakage current on the wet or dirty surface of the cable. The heat generated by the leakage current makes the wet area of ​​the cable surface evaporate to dryness. Be...

AI Technical Summary

Problems solved by technology

In actual application, this kind of cable has poor anti-interference ability. If it is installed overhead in the strong electric field environment of high-voltage transmission lines, the potential generated by the capacitive coupling between the cable and the high-voltage phase line and the earth will be generated on the surface of the cable. Different potentials lead to potential differences. The potential difference will cause leakage current on the wet or dirty cable surface. The heat generated by the leakage current will evaporate the wet area on the cable surface, and the dry zone will be generated due to the instantaneous interruption of the leakage current in the evaporation area. Flashover and strong heat energy, the gradually accumulated heat will damage the surface of the cable, aging and scorching the cable material, forming corrosion traces of dendritic carbonization channels

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