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

An orthogonal analysis and tower-line technology, applied in the field of orthogonal analysis to formulate ice-melting strategies for the tower-line system, can solve the problems of increasing tower body stress, not considering the ice-melting sequence, tower collapse, etc., and achieve the effect of preventing tower collapse accidents

Active Publication Date: 2019-12-10
WUHAN UNIV
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AI Technical Summary

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

Method used

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

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Embodiment Construction

[0039] The specific implementation manner of the present invention will be further described below in conjunction with specific examples.

[0040] Taking the orthogonal analysis of the icing situation of the two-tower three-wire system of a ±800kV DC transmission line as an example, how to formulate the ice-melting strategy is further explained. The single-circuit line No. 394-397 tower of this line is selected as the research object.

[0041] figure 1 It is a specific flow diagram of this embodiment, figure 2Shown is a schematic modeling diagram of the two towers and three wires system of this embodiment. According to the actual situation of the tower, material parameters such as different material properties and cross-sectional area are predefined to meet the needs of modeling the tower with a 1:1 size ratio. Since the tower itself is a left-right symmetrical structure, in order to improve the modeling efficiency, a 3D finite element model of half of the tower can be est...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 张力阮江军李冠南杜志叶黄道春全万霖欧阳子卿
Owner WUHAN UNIV
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