Direct-current de-icing method of overhead ground wire and composite optical fibre ground wire

Abstract

The invention discloses a direct-current de-icing method of an overhead ground wire and a composite optical fibre ground wire. A direct-current de-icing device used in the direct-current de-icing method comprises a converter, a direct-current side switch and a control protection system. A whole wire is electrically communicated with two insulated overhead ground wires or one insulated overhead ground wire and connected with an insulated composite optical fibre ground wire in parallel; a one-phase conductor is served as a return wire; after the head ends of the two insulated ground wires are short-circuited, the two insulated ground wires are connected to the cathode of the converter in the direct-current de-icing device through the direct-current side switch; the tail ends of the two insulated ground wires are short-circuited with the tail end of any one-phase conductor in a three-phase alternating-current circuit to be de-iced; the any one-phase conductor is connected with the anode of the converter in the direct-current de-icing device through the direct-current side switch; and the control protection system is connected with the converter. According to the de-icing method usingthe direct-current de-icing device, the voltage to ground of the insulated ground wire in the process of de-icing can be obviously reduced; and the operation voltage requirements of a ground wire insulator and a parallel clearance thereof are reduced; and therefore, wire losses resulted from the overhead ground wire and the composite optical fibre ground wire are greatly reduced.

Description

technical field [0001] The invention relates to a DC deicing method for overhead ground wires and composite optical fiber ground wires, and belongs to the innovative technology for DC deicing application of power transmission lines in transmission networks. Background technique [0002] As the global climate continues to deteriorate, the damage caused by ice disasters to transmission lines is becoming more and more serious. Especially the ice disaster in early 2008 caused huge losses to my country's power grid. [0003] After the ice disaster in 2008, my country's electric power science and technology workers independently carried out the research and development of DC ice-melting technology and devices, and successfully developed a high-power DC ice-melting device with completely independent intellectual property rights. Various types such as transformers and vehicle-mounted mobile types have been promoted and applied throughout the country. [0004] In January 2011, due t...

AI Technical Summary

Problems solved by technology

[0006] Different from overhead wires, ordinary overhead ground wires in my country mainly adopt segmental insulation and one-point grounding methods, and composite optical fiber ground wires (OPGW for short) basically adopt base-by-base grounding methods, which cannot be directly connected to overhead ground wires and composite optical fiber ground wires (OPGW). to melt ice

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