Railway signal cable grounding system

Abstract

The invention discloses a railway signal cable grounding system, which comprises a railway signal cable, a through ground wire and surge protection devices, wherein the number of the surge protection devices is equal to the number of segments of the railway signal cable; and one end of a cable metal outer sheath of each segment of cable of the railway signal cable is directly connected with the through ground wire and the other end of the cable metal outer sheath is connected with the through ground wire through one surge protection device. Under the power frequency condition, the minimum traction current passes through one end of each cable metal outer sheath since the corresponding surge protection device is in a high-impedance near open-circuit mode state, and can be neglected, so that the risk of burnout of the cable is avoided. Under the lightning transient condition, one end, which is not connected with the through ground wire, of each cable metal outer sheath is connected with the through ground wire through the corresponding surge protection device, the potential of each cable metal outer sheath at the end can be reduced to below protection voltage of the corresponding surge protection device, and the cable and equipment are not damaged by the protection voltage, so that safe application of the cable and the equipment in a lightning environment is ensured.

Description

technical field [0001] The invention relates to the technical field of cable grounding, in particular to a railway signal cable grounding system. Background technique [0002] The railway signal cable has the function of transmitting analog signal (1MHz), digital signal (2Mbit / s), rated voltage AC 750V or DC 1100V and below system control information and electric energy transmission function, suitable for railway signal system between related equipment and control devices Connection. In high-speed railways, railway signal cables are mainly used for analog signal transmission of ZPW-2000A track circuits, and are usually laid along the lines in cable troughs next to the rails. [0003] In practical applications, the length of railway signal cables is generally 7.5km to 12.5km, and 10km is common. Usually, the railway signal cable is connected to the core wire every 1km, and the cable metal outer sheath at the core wire connection is disconnected. In order to avoid personal ...

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention discloses a railway signal cable grounding system to solve the problem that the segmented single-end grounding method of the railway signal cable will cause a relatively high potential to accumulate at the end of the cable metal outer sheath that is not connected to the through-ground wire, thereby affecting Problems with cables and equipment causing damage

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