Method for evaluating ice resistance of tower-wire coupled system of overhead transmission line

Abstract

The invention relates to a method for evaluating ice resistance of a tower-wire coupled system of an overhead transmission line, which belongs to the technical field of natural disaster prevention of the overhead transmission line. The method comprises the steps of selecting a micro terrain section which is easy to have ice coating in the overhead circuit by utilizing a computer through a program, establishing a finite element model of the tower-wire coupled system, calculating a weak link and the ice resistance of the tower-wire coupled system under the effect of uniform ice coating and wind load, carrying out non-uniform ice coating load correction for the micro terrain section where the ice coating is easy to occur, and determining the weak link and the ice resistance of the tower-wire coupled system. The method has characteristics that the workload is small, the authenticity is high, the precision is high, reliable evidence can be provided for the ice coating disaster early-warning grade and the early-warning threshold value of the overhead transmission line so as to take de-icing measures in time, the ice coating disaster can be effectively prevented, and the safe and reliable running of the overhead transmission line can be ensured. The method can be widely applied to the evaluation of the ice resistance of the tower-wire coupled system of the overhead transmission line.

Description

technical field [0001] The invention belongs to the technical field of natural disaster defense of overhead transmission lines. It specifically relates to the evaluation method of the anti-icing ability of the tower-line coupling system of overhead transmission lines. Background technique [0002] The overhead transmission lines of my country's power system are widely distributed in the wilderness of the land of China. Most of them pass through hills, mountains, cross canyons, and rivers. They are exposed to nature for a long time and are extremely vulnerable to natural disasters such as ice. my country is one of the countries with severe icing on overhead transmission lines. Large-scale ice disasters have occurred frequently in our country. For example, in 2008, there were long-term, high-intensity, large-scale low-temperature rain, snow and freezing weather in parts of central and eastern China. , leading to various disasters and accidents such as disconnection of overhead...

AI Technical Summary

Problems solved by technology

The main disadvantages of this analysis method are: Manually select 3 types of conductors and 4 typical towers in the operation of the rural power network as the analysis objects , does not include ultra-high voltage and ultra-high voltage lines, is not comprehensive, and cannot meet the requirements of future power grid development

Using ANSYS finite element analysis software, the finite element model of the wire and the finite element model of the tower are calculated and compared under different ice thickness conditions The analysis does not take into account the interaction between the wires and ground wires and the tower, resulting in poor calculation and analysis accuracy. It can only be used as a reference for the anti-icing design of the rural power grid lines in the future, and cannot be used as the basis for the anti-icing ability of the rural power grid lines; Analysis of the anti-icing capability of the pole tower, without correction and calculation of uneven icing, according to statistics, uneven icing is the cause of icing topple the tower The main cause of the accident, resulting in poor assessment of the authenticity; The influence of terrain (height difference) is not considered, which also leads to insufficient accuracy of the calculation model and poor authenticity

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