Online icing-prevention and snow-coverage-prevention method for electric transmission line by utilizing separate-excitation resonance

Abstract

The invention provides an online icing-prevention and snow-coverage-prevention method for an electric transmission line by utilizing separate-excitation resonance. The method is implemented by jointly utilizing an icing-prevention and snow-coverage-prevention terminal device and a monitoring center which are arranged on the line. According to the working principle, the icing-prevention and snow-coverage-prevention terminal device arranged on the electric transmission line monitors environmental parameters online, when freezing rain or snowing is judged to happen, the icing-prevention and snow-coverage-prevention terminal device automatically runs, mechanical vibration the same as the fixed frequency value of the electric transmission line is generated to be used as an externally-added excitation source, the externally-added excitation source and the electric transmission line generate resonance, the electric transmission line is prevented from being frozen or covered by snow, and the online ice and snow prevention function of the electric transmission line is achieved. The icing-prevention and snow-coverage-prevention terminal device and the monitoring center can in real-time remote communication and perform real-time feedback, and early warning is performed on the nearby area with no icing-prevention and snow-coverage-prevention terminal device. According to the method, various power grid accidents caused by icing of the electric transmission line can be effectively avoided, and the new idea that passive deicing is changed into active ice prevention is provided for a power system.

Description

technical field

[0001] The invention relates to the technical field of power system safety, in particular to an online anti-icing and snow-covering method for transmission lines using external excitation resonance. technical background

[0002] According to incomplete statistics, since the middle of the last century, my country's transmission lines have suffered thousands of icing disasters of varying degrees, and icing on transmission lines will lead to collapsed towers, broken lines, ice flashes, tripping, dancing wires, and damage to electrical equipment, etc. question. Some provinces and cities in southern my country often suffer from low temperature, rain, snow, and freezing disasters at the end of winter and early spring. When the temperature is around zero, the snow covered on the transmission line will melt and freeze twice, making The icicles are stronger and thicker, causing major damage to the transmission line, not only destroying the structure of the power grid, ...

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