Optimizing method for the most serious case of uneven icing in the tower line system
A tower line and ice coating technology, which is applied in the optimization field of the most serious case of uneven ice coating of the tower line system, can solve the problem of heavy workload, and achieve the effect of avoiding melting ice and falling down the tower
Active Publication Date: 2020-04-24
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 implementation of the present invention will be described below in conjunction with a certain section of a ±800kV DC UHV line of a two-tower three-line system and the drawings.
[0031] See figure 1 , The figure is a schematic diagram of a two-tower three-wire system line model, where Figure (a) shows the two-tower three-wire system on both sides of the tension tower conductor, ground wire hanging point and insulator string hanging point, the figure, 1 represents the ground wire hanging Point, 2 represents the wire hanging point, 3 represents the insulator string, 4 represents the insulator string hanging point. Because the tensile towers on both sides of the two-tower three-line system are very sturdy in design, according to statistics, almost all collapsed towers occur in linear towers, and the tensile tower itself can withstand high tension, so when analyzing the two-tower three-line system When the straight-line tower is restricted, the hanging points of the...
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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 a method for optimizing the most serious case of uneven ice coating in a tower line system. Background technique [0002] Transmission lines are an indispensable part of the power system, and they are responsible for the transmission of electric energy. Long-term analysis and observation show that transmission lines are not only an extremely critical facility of the power grid system, but also the main artery for the safe and reliable operation of the power grid. Transmission towers play an important role in supporting the conductor and ground. However, poles and towers are often damaged or even collapsed in harsh operating environments such as severe ice coating and strong winds, leading to major grid failures. [0003] Since the tower components often bear the effects of ice load, wind load, tower foundation...
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IPC IPC(8): G06F30/20G06T17/00
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