A compound return line

Abstract

The invention provides a composite return wire which comprises return wires, a main insulation unit and an outer sheath in the radial direction from the inside to the outside and further comprises low-voltage power supply wires and / or a communication wire. The composite return wire is provided with a power-taking port in a position with the need for a power supply. The composite return wire provides power supply for an online monitoring device matched with the cable through the low-voltage power supply wires and the power-taking port. The composite return wire is provided with a conversion interface at a position where the online monitoring device matched with the cable needs to provide information and signal transmission. The composite return wire provides signal and information transmission for the online monitoring device matched with the cable through the communication wire and the conversion interface. According to the composite return wire, the functions of power supply and communication are fused on the basis that the composite return wire is used as a single-core cable outer metal sheath inductive current return wire, a return ground wire, the power supply wires and the communication wire are integrated in one body, the engineering cost is reduced, and the problem of monitoring power and communication of a power cable network is solved.

Description

Technical field [0001] Technical Field The present invention relates to a power cable, in particular to a composite return line. Background technique [0002] In the "Power Cable Engineering Design Specifications" (GB 50217-2007) of the return line are defined: Single core cables arranged parallel to the high-voltage line, so that an induced current to ground at both ends of the wire loop is formed. In the "power cable line operating procedures" (DL / T 1253-2013) was also performed on the return line states: single-core cable metal shield (metal jacket) single-point ground network, in order to suppress formation of single-phase earth fault current of , and reducing the metal of the external magnetic field induced voltage on the shield (metal sleeve), laid along the cable parallel line of low impedance ground wire. (Note: the general return line with an insulating layer). [0003] 110kV and above the single-core cables in the frequency may occur over cable or shock induced voltag...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defects in the prior art, the present invention provides a composite return line to solve some or all of the problems mentioned in the background section

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