Method for early warning meteorological risk of power transmission line windage yaw faults

Abstract

The invention discloses a method for early warning meteorological risk of power transmission line windage yaw flashover faults. In view that strong wind resulting in windage yaw flashover arcing correlates to strong weather processes closely, via analysis on weather processes, the ground, meteorological elements at high altitude and weather indexes before and after the occurrences of historical windage yaw flashover faults, an integrated model of the whole atmosphere associated with the windage yaw flashover faults is proposed. In addition to considering the changes of wind speed itself, changes of the factors, such as temperature and pressure, closely related to strong weather processes and the instruction significance of high altitude weather indexes are also considered in the model. What's more, on this basis, further combining with numerical mode forecast results, the integrated model of the whole atmosphere is adjusted so as to adapt to the numerical mode forecast results. The accuracy in time and in space can also be significantly improved.

Description

technical field [0001] The invention relates to the technical field of early warning of wind deflection faults of transmission lines, in particular to a meteorological risk early warning method for summer monsoon faults of transmission lines. Background technique [0002] Since the overhead line in the transmission line is exposed to the outdoors all the year round, it is often swayed by the wind force, so that the electrical distance between the wire-tower or wire-surrounding trees is reduced. When the electrical strength of this gap distance cannot withstand the maximum operating voltage of the system When the breakdown discharge occurs, this phenomenon is generally called the wind deflection flashover phenomenon of the line. Wind deflection flashover is different from lightning strike flashover and operation shock flashover. It mostly occurs under working voltage, and due to the continuity and persistence of wind, once wind deflection flashover occurs, it is generally imp...

AI Technical Summary

Problems solved by technology

Severe convective weather is usually very local, the duration of strong wind is not long, and the range of occurrence may not be large. Therefore, there are some places where the actual wind speed is very high, but the nearby weather stations have not observed a large wind speed. Judging the strong wind from the wind speed data recorded by the weather station alone may lead to a small estimate of the line wind speed

In addition, the weather systems that cause wind flashovers have different effects in different regions in different seasons, and there are also significant differences in the characteristics of strong winds

Wind deflection flashover accidents caused by strong winds in winter and spring may be related to instantaneous wind speed and vertical motion of the atmosphere, and the average wind speed recorded by the weather station cannot reflect these wind characteristics

On the other hand, not all strong winds cause a wind flashover

For example, a large-scale squall line appeared on June 3, 2009, but there was no record of wind-biased flashover faults in Henan

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