Method of Orthogonal Analysis for Formulating Ice-melting Strategy of Tower-Line System

Abstract

The invention discloses a method for making a de-icing policy of a tower line system through orthogonal analysis. The method comprises the steps of 1, building a three-dimensional finite element model of the tower line system; 2, determining a multi-factor two-level orthogonal table, compiling a multi-factor two-level orthogonal test scheme, and defining mechanics failure indexes of towers; 3, according to the multi-factor two-level orthogonal test scheme, applying designed wind load and ice load to a hanging position of each wire insulator and a hanging position of each ground wire respectively by adopting a finite element method, simulating stress conditions of each tower under different loads, and obtaining a maximum axial stress ratio and a dangerous unit number of an angle steel unit of each tower; and 4, for each index, calculating an index average value of each factor and each level, and obtaining a most serious icing condition according to the index average value, thereby obtaining an optimal de-icing sequence. According to the method, the most serious icing condition can be assessed under the condition of giving parameters of icing, a wind speed, a span and the like, and the optimal de-icing sequence of the tower line system is given.

Description

technical field [0001] The invention belongs to the technical field of deicing of power transmission lines, in particular to a method for formulating deicing strategies for tower line systems through orthogonal analysis. Background technique [0002] Transmission lines bear the heavy responsibility of transmitting electric energy, and tower collapse accidents caused by icing on towers, conductors, and ground wires in winter pose a threat to the safe and stable operation of the power system. However, full icing of wires and ground wires is not necessarily the most serious operating condition that causes ice damage accidents; uneven icing of wires and ground wires will cause the tower to be greatly affected by unbalanced tension, which is even worse than the full icing condition. It may lead to mechanical failure of the tower. [0003] The research on line icing at home and abroad has taken into account the influence of uneven icing and unbalanced tension. The simulation anal...

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Problems solved by technology

The uneven icing of the ground wire caused by improper ice melting strategy will increase the stress on the tower body and cause the tower to collapse.

However, the traditional ice-melting scheme does not consider the ice-melting sequence of each phase conductor and ground wire. In addition, the optimal ice-melting sequence will vary with the distance, altitude, wind direction, and height difference. Therefore, it is necessary to propose a A method for formulating ice-melting strategy for tower line system based on orthogonal analysis

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