Analysis method of transmission line wind-ice coupling load line breakage effect

Abstract

The invention provides an analysis method of a transmission line wind-ice coupling load line breakage effect. The analysis method includes the following steps that 1, geometric parameters and physical parameters of a transmission tower line system are determined, and a transmission tower line system analysis model is established; 2, icing loads of the transmission tower line system are determined; 3, a non-linear analysis method of a transmission tower line system reaction under the effect of the icing loads is established; 4, a wind load model in which the wire icing thickness changes is established; 5, a dynamic analysis method that a transmission wire is broken under the effect of wind-ice coupling loads is established, and the dynamic effect of transmission line icing line breakage is analyzed and calculated. According to the method, the coupling effect of the icing loads and wind loads is considered at the same time, the analysis formula is displayed and expressed, the calculation speed is high, the calculation amount is small, and the defects of existing traditional methods can be effectively overcome. The method is suitable for analysis and calculation of the icing line breakage effect of various transmission tower line systems with different spans and sags under the effect of the ice-wind coupling loads.

Description

technical field [0001] The invention relates to an analysis method for the disconnection effect of wind-ice coupling load on transmission lines, and belongs to the technical fields of transmission line load analysis and disaster reduction and prevention. Background technique [0002] The long-term field service of transmission lines is prone to damage and destruction under the action of harsh environmental loads. In my country, there are many accidents of fracture and damage of transmission lines caused by icing. The icing disasters of transmission lines in my country mostly occur in winter and early spring, and the icing of conductors is affected by the local micro-meteorological conditions of transmission lines, such as environmental wind speed, environmental temperature and humidity, and terrain. The water vapor in the air at the freezing altitude can easily form supercooled water droplets, snowflakes or ice crystals. The supercooled water droplets will hit the transmiss...

AI Technical Summary

Problems solved by technology

Although the early analysis methods have the advantages of simple form, they cannot fully consider the strong geometric nonlinear effect, so there are some differences between the analysis results and the actual engineering catastrophe characteristics

[0006] (2) The current method does not fully consider the coupling effect of icing load and wind load

This will cause the wind area of ​​the iced conductors to vary over time, thus resulting in varying fluctuating wind loads on the iced conductors

However, the current analysis method does not consider the influence of the thickness of the wire ice coating on the wind load.

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