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Method for electric transmission line windage yaw transient analysis under action of moving thunderstorm wind

A technique for transmission line, transient analysis, applied in the direction of electrical components, cable installation, cable installation devices, etc.

Active Publication Date: 2014-03-26
STATE GRID CORP OF CHINA +1
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Problems solved by technology

In previous studies, the maximum wind deflection angle of transmission lines was generally determined approximately by static calculation using a single pendulum model, and did not involve the checking of the maximum wind deflection angle under extreme wind loads including thunderstorms. The influence of extreme wind loads cannot be ignored for transmission lines in frequently occurring areas, so it is necessary to conduct in-depth research on the wind deflection response of transmission lines under the action of thunderstorm winds

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  • Method for electric transmission line windage yaw transient analysis under action of moving thunderstorm wind
  • Method for electric transmission line windage yaw transient analysis under action of moving thunderstorm wind
  • Method for electric transmission line windage yaw transient analysis under action of moving thunderstorm wind

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Embodiment Construction

[0040] The wind deflection transient analysis method of the transmission line under the action of the moving thunderstorm wind of the present invention comprises the following steps:

[0041] A: From the perspective of stiffness, cross-sectional area and surface characteristics of the split sub-wire, according to the equivalent principle, a rigid model of the split sub-wire is made, and a uniform flow wind field with a specific degree of turbulence and a reference wind speed is simulated in the wind tunnel laboratory. The wind tunnel test is carried out on the rigid model of the split sub-conductor, and the aerodynamic coefficient corresponding to each split sub-conductor varies with the wind attack angle α C D (α);

[0042] B: Construct a three-dimensional static thunderstorm average wind field model, and obtain the horizontal radial average wind speed u(z,r) and vertical average wind speed w(z,r) at any point under the action of the three-dimensional static thunderstorm aver...

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Abstract

The invention discloses a method for electric transmission line windage yaw transient analysis under action of moving thunderstorm wind. The method comprises the steps that the vertical wind speed is considered in simulation of a moving thunderstorm wind field and the spatial correlation and the pulsation effect are synchronously considered; when the wind load is determined, a transient wind attack angle and a corresponding divided conductor aerodynamic coefficient are introduced, and the wind speed and change of the direction are considered in a time domain; in the analysis process of a wind deflection angle, displacement, caused by the asymmetric load, in the direction of a line is considered, the largest wind deflection angle of part of the electric transmission line is calculated under the condition of the extreme wind load, design work of windproof measures of the electric transmission line is directed, and the power supply reliability of the electric transmission line is improved.

Description

technical field [0001] The invention relates to transmission line planning, in particular to a transient analysis method for transmission line wind deflection under the action of a moving thunderstorm. Background technique [0002] For the high requirements of the transmission capacity of the transmission line, the voltage level of the transmission line is gradually increased to achieve high-power medium and long-distance power supply, so that the span of the transmission line increases rapidly. Therefore, the transmission line is more sensitive to wind loads. Increased likelihood of rarer extreme wind loads. In recent years, due to the action of local short-term strong winds, the wind deflection of transmission lines is too large, which leads to frequent occurrence of flashover discharge accidents and seriously affects the normal operation of the power grid. Thunderstorm wind is a typical short-term transient strong wind. The generation of thunderstorm wind is an extreme w...

Claims

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Application Information

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IPC IPC(8): H02G1/00
Inventor 阎东吕中宾卢明张少锋谢凯蒲兵舰杨晓辉王吉
Owner STATE GRID CORP OF CHINA
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