On-line anti-icing and snow-covering method for transmission lines using external 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. [0002] technical background [0003] 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 powe...

AI Technical Summary

Problems solved by technology

The traditional method of manual deicing by external force is simple and easy, but the work efficiency is low, and at the same time, it poses a great threat to the life safety of electric workers; the mechanical deicing robot is used for deicing, because it needs to move over obstacles, The robot is large in size, high in cost, and complex in mechanism, which is easy to cause additional line faults, and the tip of the deicing tool is likely to cause tip discharge in a high-voltage environment, introducing unstable factors to the power system; using Joule heat to melt the ice robot deicing is large Some of them are based on the premise of power failure of the transmission line, and the energy consumption is large, the investment cost is high, and the deicing range is small, which causes social and economic losses and brings great inconvenience to people's lives.

[0005] The existing anti-icing methods for high-voltage transmission lines at home and abroad are mainly divided into anti-icing methods of spraying anti-icing coatings and Joule heating anti-icing methods. Among them, spraying anti-icing coatings is mostly done by manual or machine spraying, and the workload is large. , The timeliness of anti-icing is short; the anti-icing method of Joule heat is to install a reactive power compensation device in the middle of the transmission line or use a split wire to increase the current transmission of the sub-conductor, thereby generating a large current and melting the ice with Joule heat to achieve anti-icing The purpose, its energy consumption is big, investment cost is high, anti-icing range is small, cause loss to social economy and bring great inconvenience to people's life

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