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Two-dimensional numerical simulation method for icing process of power transmission line

A simulation method and two-dimensional numerical technology, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve problems that do not take into account the local geometric changes of ice shapes

Inactive Publication Date: 2013-07-24
STATE GRID CORP OF CHINA +2
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  • Abstract
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Problems solved by technology

Jiang Xinliang proposed a relatively complete hydrodynamic model, and obtained the concept of the amount of ice on the wire per unit length per unit time, but this model did not take into account the local geometric changes of the ice shape

Method used

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  • Two-dimensional numerical simulation method for icing process of power transmission line
  • Two-dimensional numerical simulation method for icing process of power transmission line
  • Two-dimensional numerical simulation method for icing process of power transmission line

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Embodiment Construction

[0079] Examples:

[0080] The influence of air temperature on ice cover is extremely important. Generally, the temperature that is most likely to be iced is -6°C~0°C. If the temperature is too low, the supercooled water droplets will turn into snowflakes, which will not form icing on power lines. When rime icing is formed, the temperature is usually higher. Generally between -5°C~0°C; for rime ice, the temperature is lower, below -8°C, generally between -15°C~-10°C; mixed rime is usually between Between rime and rime, the temperature range when covered with ice is -9°C~-3°C.

[0081] During the calculation, a total of 6 working conditions were selected, and the temperatures from low to high were -15°C, -10°C, -7°C, -5°C, -3°C, and -2°C. The wire type is LGJ-240 / 30. The calculation found that when other parameters are selected in the following table, the temperature is -15°C, -12°C, -7°C, -5°C, and the calculation result is rime ice; when the temperature is -3°C, the calcula...

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Abstract

The invention belongs to the field of electric power systems and relates to a two-dimensional numerical simulation method for an icing process of a power transmission line. Based on the lagrangian method, the invention provides the two-dimensional numerical simulation method for a surface rime icing process of the power transmission line. A Reynolds-averaged Navier-Stokes (RANS) equation and shear-stress-transport-k-omega (SST-k-omega) turbulence model of non-steady incompressible flow is solved by adopting a semi-implicit method for pressure linked equations (SIMPLE) algorithm on a staggered grid so as to obtain an air flow field; movement tracks of super-cooled water droplets in the flow field are tracked by adopting the lagrangian method to obtain the transient local collision rate of all control volumes on the surface of the power transmission line; solving is performed based on an icing thermodynamic equation established by a Messinger control volume method so as to obtain the rime icing temperature of all the control volumes, and the icing process is simulated by combining an icing time marching method. Indicated by results, predicted ice shapes are better fitted with test measurement data in literature, and therefore, the two-dimensional numerical simulation method for the icing process of the power transmission line is feasible and effective.

Description

technical field [0001] The invention belongs to the field of power systems, and relates to a two-dimensional numerical simulation method for the icing process of transmission lines. By establishing a mathematical model of icing growth on transmission lines and a simulation process thereof, the growth of rime, rime and mixed rime under different environmental conditions can be studied. The process is simulated. Background technique [0002] The phenomenon that the moisture accumulated on the surface of an object is frozen to form ice (frost) is a natural phenomenon that is widely distributed. Transmission line icing is a natural phenomenon that undergoes phase change, is related to meteorology, thermodynamics, heat transfer, fluid mechanics, etc. stochastic process. However, for power systems, icing is a natural disaster, difficult to eradicate, and highly destructive, and the damage it causes cannot be ignored. The thickness of the ice coating on the transmission line can...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 刘胜春邸玉贤王景朝
Owner STATE GRID CORP OF CHINA
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