A Method for Evaluating the Impact of Underground Power Cables on Subway Signal Cables
A technology for power cables and signal cables is applied in the field of evaluation of the impact of underground power cables on subway signal cables, and can solve problems such as being unable to be widely used in practical situations.
Active Publication Date: 2018-07-03
HUBEI ELECTRIC ENG CORP +2
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Problems solved by technology
In China, there are currently 10kV and 35kV power cables in subway tunnels for evaluating the electromagnetic induction hazards of wired communication systems. Only the short-circuit current of power cables and the parallel length of strong and weak current cables are considered, and the distance between strong and weak current cables is not considered. and the shielding parameters of the tunnel are considered as variables, which cannot be widely used in actual situations
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[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments to facilitate a clear understanding of the present invention, but they do not limit the present invention.
[0023] Due to the limitation of urban space, rail transit and signal cables are often built close to the passage of power cable lines, and power cable lines may interfere with signal cables during normal operation or through fault currents. The alternating current in the power cable will generate a changing magnetic field around it, and a certain number of magnetic force lines will pass through the signal cable laid in parallel to form a magnetic flux, and an electromotive force will be induced on the signal cable. When the induced electromotive force exceeds the limit It will affect the normal operation of the signal cable. The purpose of the present invention is to be used in the impact assessment of underground power cable lines...
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The invention discloses an assessment method for influence of an underground power cable on a subway signal cable. The assessment method comprises the steps of: acquiring construction parameters of the underground power cable and the subway signal cable, changing the construction parameters constantly, calculating values of influence on the subway signal cable when a single phase short-circuit fault occurs in the underground power cable under different parameter conditions, acquiring a curve of values of influence on the subway signal cable when the single phase short-circuit fault occurs in the underground power cable, assessing the influence of the underground power cable on the subway signal cable according to the curve of values of influence, and taking corresponding protective measures when the values of influence exceed a specified value. The assessment method can perform quantitative calculation on influence of the underground power cable on the typical subway signal cable, assesses influence of the underground power cable on subway communication, reasonably adjusts construction design schemes of the underground power cable and the subway tunnel signal cable, and improves operation reliability of the underground power cable tunnels and subway lines.
Description
technical field [0001] The invention belongs to the technical field of electric power communication, and in particular relates to an evaluation method for the influence of underground power cables on subway signal cables. Background technique [0002] The safe and reliable operation of the subway requires the support of the subway communication and signaling system, and the laying of signal cables is an important part of railway engineering construction. Due to the shortage of resources in power corridors, more and more power lines are laid in the form of underground power cables, and power lines and rail transit are often built close to cable line channels. Due to electromagnetic induction, when the power cable line is in operation or fails, it will cause interference and dangerous effects on the adjacent subway signal cable, which may affect the normal operation of the subway signal system, damage the subway signal cable and the signal equipment connected to the signal cab...
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IPC IPC(8): G06F17/50
CPCG01R31/081G01R31/088G06F30/398
Inventor 甘世新周文俊殷建刚杨清舟颜剑王汉广叶丽莎
Owner HUBEI ELECTRIC ENG CORP