Method for judging icing instability of tension support of power transmission line

Abstract

The invention discloses a method for judging the icing instability of a tension support of a power transmission line. The method comprises the following steps that: S1: establishing a pole and tower finite element mechanical analysis fine numerical simulation model; S2: solving and calculating the force direction and the change amount of an insulator string mount point before and after the pole and tower is iced; S2: carrying out finite element numerical calculation; S4: considering an influence of practical uneven icing of two sides of a tension support structure, and making an pole and towerinstability curve; and S5: according to the tension or icing thickness practicality of the mount point under an icing condition, judging a current power transmission line pole and tower instability situation. By use of the method, the real-time tension of the insulator string mount point, finite element situation calculation is adopted to researching the influence of the icing on the pole and tower instability, calculation efficiency can be effectively improved, a finite element calculation result is more reliable, and power grid maintenance personnel can conveniently and directly evaluate the pole and tower stability on the basis of the monitoring situation of the insulator string tension of two sides of the pole and tower.

Description

technical field [0001] The invention relates to a method for judging the ice-covered instability of a tension tower of a transmission line. Background technique [0002] The transmission tower line system is a coupling system composed of towers, insulator strings and wires. If the line design is unreasonable, the distance between the front and rear of the line will be poor, and the elevation angle will be too large. Especially, uneven icing of the line will easily lead to unbalanced tension on the tower. , In severe weather such as strong winds and freezing, accidents such as necking, breakage, insulator damage, rupture, torsion and deformation of pole and tower cross arms are prone to occur, which seriously threaten the safety of power grid operation. It is of great theoretical and engineering significance to improve the safety and reliability of my country's power grid to fully understand and master the static and dynamic characteristics of transmission towers under uneven...

AI Technical Summary

Problems solved by technology

[0003] At present, many scholars at home and abroad have insufficient quantitative research on the mechanical characteristics of the tower wire system under the uneven ice coating state of the transmission line. Requirements have been put forward for calculating the icing rate of uneven icing and ice-covered disconnection conditions, but the specific value of longitudinal unbalanced tension has not been given. Corresponding calculations need to be made according to specific conditions during line design

In addition, due to the complex mechanical properties of the tower steel structure, the actual bearing capacity of the steel structure is affected by various factors such as slenderness ratio, width-to-thickness ratio, and fatigue damage. However, it is impossible to accurately give the ultimate bearing capacity of the tower under special working conditions (severe icing), and predict the disconnection of the transmission line and the collapse of the tower

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