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

Abstract

The invention relates to a DC deicing method for overhead ground wires and composite optical fiber ground wires. The DC ice-melting device used in the DC ice-melting method includes a converter, a DC side switch, and a control and protection system. One-phase wire is used as the return line, the first ends of the two insulated ground wires are short-circuited and then connected to the negative pole of the converter in the DC ice melting device through the DC side knife switch, and the ends of the two insulated ground wires are connected to the three-phase AC that needs to be melted. The end of any phase conductor in the line is short-circuited, and the any phase conductor is connected to the positive pole of the converter in the DC deicing device through the DC side switch, and the control protection system is connected to the converter. The ice melting method of the above-mentioned DC ice melting device in the present invention can significantly reduce the voltage of the insulating ground wire to the ground during ice melting, and reduce the operating voltage requirements for the ground wire insulator and its parallel gap, so that the overhead ground wire and the composite optical fiber ground wire cause Line loss is 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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