Ice coating simulation method for 220kV transmission line tower-coupling system

Abstract

An ice coating simulation method for a 220kV transmission line tower-coupling system is provided. The method comprises the following steps: (1) performing finite element modeling of an ice-covered transmission line tower-coupling system, including: modeling a tower by using a unit mirror command, modeling of an insulator and a split conductor spacer, and modeling of split sub-conductors and groundlines; (2) performing form-finding on the transmission line tower-coupling system; (3) calculating the ice-covered loads of the transmission line tower-coupling system; (4) calculating the ice-covered-wind loads of the transmission line tower-coupling system; and (5) performing response calculation and data extraction analysis under the ice coating. According to the method provided by the presentinvention, finite element modeling of the refined tower line is performed by using the unit mirror command, the modeling period is short, and the calculation efficiency is high; according to the actual arrangement manner of the split conductor, the coupling effect between the split sub-conductors is considered, and the model is more refined; and the analytical method and the finite element methodare combined to simulate the conductor, and the technical problems of finite element modeling and form-finding of the overhead line are solved.

Description

technical field [0001] The invention relates to a icing simulation method for a tower-wire coupling system of a 220kV transmission line, which belongs to the technical field of transmission lines. Background technique [0002] The safe and stable operation of transmission lines is the key to ensuring power transmission. my country is a country with many icing accidents on transmission lines. In winter, under long-term low temperature, freezing rain, snowfall and other weather conditions, snow will adhere to the surface of transmission conductors, ground wires and towers to form icing. Icing will cause mechanical failure of the line structure, which will lead to mechanical damage accidents such as tower collapse and disconnection, and lead to large-scale line failures. In the current design codes adopted in my country, the tower load calculation considers the tower and the conductor separately, and the ice load check calculation when designing the tower is also for fixed wor...

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Problems solved by technology

[0003] Scholars at home and abroad have done a lot of research on the simulation analysis of icing on the coupling system of transmission line towers and wires, and have achieved certain results, but there are still the following deficiencies: 1. Most of the existing research uses the equivalent treatment method, which is to split the wire It is equivalent to a wire for analysis, ignoring the coupling between sub-wires

2. The horizontal stress of the conductors in the same tension section of the actual transmission line is the same everywhere, and the suspension insulators will remain in a vertical state when the line construction is completed. Tower insulator offset, without initial form-finding of the tower-wire system, or considering the initial form-finding of the tower-wire system, but the calculation is more complicated and the convergence speed is slow

3. In the icing calculation and finite element simulation, it is usually assumed that the icing is evenly distributed on the surface of the overhead line, and various equivalent methods are used to simulate the icing, and the inertia of the icing under the action of dynamics is not fully considered; 4. Most of the existing research methods focus on the single working condition of icing, but the actual transmission line is exposed to the harsh natural environment, and a variety of weather resistance tests must be considered, and the icing of the line is usually accompanied by breeze, so icing needs to be considered Response characteristics under combined load and breeze load

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