Power transmission line wind-deviation fault intelligent identification method

Abstract

The invention provides a power transmission line wind-deviation fault intelligent identification method. A fractal theory is utilized to perform fault time traveling wave current waveform similarity comparison so that power transmission line wind-deviation fault intelligent identification is realized. The method comprises the following steps: power transmission line current online monitoring data are acquired, and fault time traveling wave current data are extracted; fractal dimension of the traveling wave current data at each fault time is calculated; and the fractal dimension is analyzed and an identification result is outputted. Compared with methods in the prior art, the method is intelligible in physical concept and clear in judgment thinking so that whether a traveling wave current signal is a signal of a lightning stroke power transmission line lightning wire and a tower pole can be effectively identified.

Description

technical field [0001] The invention relates to the field of intelligent power systems, in particular to an intelligent identification method for wind deflection faults of power transmission lines. Background technique [0002] Overhead transmission lines have been operating in the wild for a long time, and are greatly affected by natural climate changes. Wind deflection flashover accidents are a major safety hazard affecting the normal operation of Hainan Power Grid, and it is not easy to reclose the line after tripping due to wind deflection flashover, which seriously affects the Safe and stable operation of the power system. Thus causing significant economic losses. [0003] Disastrous meteorological conditions are important external conditions for line tripping. In particular, the wind speed at the typhoon center is generally around level 10-12, which can break big trees by the middle and uproot small trees, causing serious damage wherever it goes. The cause of partia...

AI Technical Summary

Problems solved by technology

At the same time, strong winds are always accompanied by thunderstorms. This kind of severe weather is also a time of high incidence of rain flashes, wind swaying, and vegetation flashover. Lightning near the line corridor is superimposed on the power frequency voltage, which is more likely to cause these faults.

At present, the research on wind deflection fault tripping of transmission lines often focuses on the wind deflection angle of transmission line insulator strings and jumpers and the minimum air gap between the conductor and the tower, and evaluates the performance of the line against wind deflection flashover. The method can only examine the wind deflection design of the power system from theoretical calculations, but the most basic question of whether the tripping of the transmission line is due to insufficient wind deflection design cannot be answered.

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