Ice-coated electric transmission line weak link early warning method

Abstract

The invention discloses an ice-coated electric transmission line weak link early warning method. The ice-coated electric transmission line weak link early warning method comprises the following steps that firstly, weather forecast information, ice-coating information and electric transmission line information are determined; secondly, the real-time stress values of grades in a tension support section are solved based on an accurate model stress calculation model of an electric transmission line wire, and the unbalanced force received by a pole tower is worked out; thirdly, the numerical relationship between the real-time stress values and the limiting stress value is analyzed, wire early warning is carried out according to grades, the unbalanced force of the pole tower and the limiting unbalanced force are compared, and pole tower early warning is carried out according to grades. By means of the ice-coated electric transmission line weak link early warning method, the broken electric transmission line wire can be intelligently judged when an electric system is in an ice-coating period. Information is comprehensively collected, stress values of all the grades of the line are measured through a ruling span calculation model and the accurate stress calculation model, and therefore whether the line faces the line broken risk or not can be accurately judged, and the defects that a traditional judging method is not direct and is low in precision and long in consumed time can be avoided.

Description

technical field [0001] The invention belongs to the safety defense of icing disasters in power systems, in particular to an early warning method for weak links of icing transmission lines. Background technique [0002] Due to my country's vast territory, complex geographical environment and diverse climate types, extreme natural disasters occur frequently, such as typhoon disasters that often occur in the southeastern coastal areas every year, ice disasters in the Yunnan-Guizhou Plateau and the Three Gorges area, etc. Under these extreme weather conditions, the load on the transmission line will exceed its design capacity, causing significant changes in the stress of the transmission line, which will lead to grid failure. For example, in the ice and snow disaster in 2008, due to the long-term freezing rain, serious icing occurred on the transmission line, which caused changes in the stress of the conductors, resulting in excessive stress on the conductors and the accident of...

AI Technical Summary

Problems solved by technology

The common disadvantage of the above two methods is that the indirect acquisition of stress values ​​lacks accuracy; the first method requires relevant staff to go to the site to measure the sag, which not only consumes human resources, but also takes a long time; the second method relies on experts Experience, not automatic enough, and relatively low accuracy

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