Composite return wire

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] The invention relates to the technical field of power cables, in particular to a composite return line. Background technique [0002] The return line is defined in the "Code for Design of Electric Power Engineering Cables" (GB 50217-2007): a wire that is parallel to the high-voltage single-core cable line and grounded at both ends to form a loop for the induced current. In the "Power Cable Line Operation Regulations" (DL / T 1253-2013), the return line is also stipulated: when the single-point connection and grounding of the single-core cable metal shield (metal sleeve), in order to suppress the formation of single-phase ground fault current The influence of the magnetic field on the outside world and the reduction of the induced voltage on the metal shield (metal sleeve), the grounding wire with low impedance laid in parallel along the cable line. (Note: The return line generally has an insulating layer). [0003] For single-core cables of 110kV and a...

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

Images