Method for optimizing most serious condition of uneven icing on tower-line system
A technology of icing and tower wires, which is applied in the optimization field of the most serious case of uneven icing of the tower wire system, can solve problems such as heavy workload, and achieve the effect of avoiding melting ice and falling towers
Active Publication Date: 2017-11-24
WUHAN UNIV
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Problems solved by technology
However, it is difficult to analyze the situation of uneven icing. For example, in the two-tower and three-wire system, there are 12 sections of conductors and ground wires. 12 In this case, the workload is extremely large
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[0030] A specific embodiment of the present invention will be described below in conjunction with a certain section of ±800kV DC UHV line of a two-tower and three-wire system and the accompanying drawings.
[0031] see figure 1 , the figure is a schematic diagram of a model of a two-tower three-wire system line, in which, figure (a) represents the tension tower guide, ground wire hanging point and insulator string hanging point on both sides of the two-tower three-wire system. In the figure, 1 represents the ground wire hanging point 2 represents the hanging point of the wire, 3 represents the insulator string, and 4 represents the hanging point of the insulator string. Because the tension towers on both sides of the two-tower three-wire system are very strong in design, according to statistics, almost all tower collapses occur on straight towers, and the tension tower itself can withstand high tension, so when analyzing the two-tower three-wire system When constraining the s...
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The invention discloses a method for optimizing the most serious condition of uneven icing on a tower-line system. The method comprises the steps of 1, constructing a three-dimensional simulation model of a pole tower; 2, constructing a catenary model of conductors and a catenary model of ground wires; 3, with whether or not each conductor section and each ground wire section are covered with ice as factors, determining a two-level orthogonal array, and designing test conditions of the conductor seconds and ground wire sections; 4, according to the test conditions, exerting ice load and wind load to the catenary models of the conductor sections and the catenary model of the ground wire sections respectively, and simulating the force bearing situations of the pole tower under each test condition; 5, with the maximum value of the axial stress ratio under each test condition as a primary index and dangerous elements as secondary indexes, analyzing an orthogonal test result by means of a comprehensive balance method, and determining the most serious condition of icing distribution on each conductor section and each ground wire section. According to the method for optimizing the most serious condition of uneven icing on the tower-line system, finite element analysis is conducted according to the most serious condition, the limit bearing capacity, close to the real condition, of the pole tower can be obtained, and bases are provided for reasonable ice melting on the basis of section division and line division.
Description
technical field [0001] The invention belongs to the technical field of ice disaster prevention and mitigation for power transmission lines, and more specifically relates to an optimization method for the worst case of uneven ice covering of a tower line system. Background technique [0002] Transmission lines are an integral part of the power system and undertake the heavy responsibility of power transmission. After long-term analysis and observation, it is shown that the transmission line is not only an extremely critical facility of the power grid system, but also the main artery of the safe and reliable operation of the power grid. Transmission towers play an important role in supporting conductors and ground wires. However, towers are often damaged or even collapsed under harsh operating environments such as severe icing and strong winds, resulting in major power grid paralysis accidents. [0003] Because the tower components are often subjected to different working co...
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IPC IPC(8): G06F17/50G06T17/00
CPCG06F30/20G06T17/00
Inventor 张力阮江军全万霖杜志叶黄道春李冠南欧阳子卿
Owner WUHAN UNIV