Method for analyzing critical icing type based on numerical simulation model

Abstract

The invention discloses a method for analyzing a critical icing type based on a numerical simulation model. The method comprises steps of building a two-dimensional wire geometric model and an air flow field model, and solving to obtain air flow field distribution; a water drop stress balance equation being established, a water drop motion equation being obtained according to the water drop stressbalance equation, a water drop motion track being obtained according to the water drop motion equation and the air flow field distribution, and a wire collision coefficient being obtained according to the water drop motion track; establishing a wire icing heat balance equation, and establishing a wire icing freezing coefficient according to the wire icing heat balance equation; and obtaining critical conditions of the glaze and the rime, combining the conductor collision coefficient and the conductor icing freezing coefficient to obtain a change relationship of the critical environment temperature and the critical liquid water content along with external environment factors under the critical conditions of the glaze and the rime, and judging the icing type according to the change relationship and actual meteorological conditions. The method can be widely applied to power transmission line icing type prediction.

Description

technical field [0001] The invention relates to the field of icing prediction of power transmission lines, in particular to a method for analyzing critical icing types based on a numerical simulation model. Background technique [0002] The icing of transmission lines seriously affects the safe and stable operation of the power grid. The emergence of extreme weather conditions has caused frequent incidents of large-scale icing of transmission lines, resulting in accidents such as disconnection of transmission lines, dancing wires, tower collapses, and insulator flashovers, which have caused serious damage to the power grid department. Huge economic property loss. So far, the numerical simulation research on transmission line icing mainly involves the collision characteristics and freezing characteristics of conductors. There are many numerical solution methods, but different icing types have slightly different corresponding icing growth models. Therefore, the analysis of ici...

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Problems solved by technology

[0002] The icing of transmission lines seriously affects the safe and stable operation of the power grid. The emergence of extreme weather conditions has caused frequent incidents of large-scale icing of transmission lines, resulting in accidents such as disconnection of transmission lines, dancing wires, tower collapses, and insulator flashovers, which have caused serious damage to the power grid department. Huge loss of economic property

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