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A method for determining the load reduction factor on the leeward side of the cross arm of the transmission tower

A technology for transmission towers and leeward sides, applied in the direction of electrical digital data processing, data processing applications, special data processing applications, etc., can solve problems such as greater influence on calculation accuracy, achieve improved calculation accuracy, and reduce loads on the leeward side of the arm accurately The effect of the coefficient

Active Publication Date: 2019-03-22
STATE GRID CORP OF CHINA +2
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  • Abstract
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Problems solved by technology

This ignores the difference in shape between the cross-arm and the tower body, and the influence of the change of wind direction angle on the load reduction coefficient of the leeward side. However, the cross-arm is generally higher from the ground and the wind speed is higher, so the value deviation of the load reduction coefficient on the leeward side It has a great influence on the calculation accuracy of the wind load on the tower

Method used

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  • A method for determining the load reduction factor on the leeward side of the cross arm of the transmission tower
  • A method for determining the load reduction factor on the leeward side of the cross arm of the transmission tower
  • A method for determining the load reduction factor on the leeward side of the cross arm of the transmission tower

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Embodiment 1

[0061] Such as Figure 1-6 As shown, the invention of this example is a method for determining the load reduction coefficient of the leeward side of the transmission tower cross arm, and the method is determined based on a wind tunnel test; the method includes the following steps:

[0062] The selected cross-arm has a total height of 5.05m and a width of 11.4m. In view of the fact that the too small model may introduce the Reynolds number effect, and the rigidity of the model and the connection of components will be difficult to guarantee. Therefore, the geometric scale ratio of the model should not be greater than 1:10. The width of the general wind tunnel test section is 3m, and the height is 2.5m. 1.01m. The size of the cross-arm model is attached figure 2 shown. Because the wind load of the tower body and the cross arm needs to be measured separately, the tower body and the cross arm need to be manufactured separately. Because the wind load on the windward side and th...

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Abstract

The invention relates to a method for determining cross arm leeside load decreasing coefficient of a transmission tower. The method is determined based on a wind tunnel experiment. The method comprises the following steps: manufacturing a wind tunnel model; separating cross arm wind load; determining a cross arm shape coefficient; determining a cross arm windward side shape coefficient; determining a cross arm leeside shape coefficient; and determining the cross arm leeside load decreasing coefficient. According to the method, the more accurate cross arm leeside load decreasing coefficient based on the wind tunnel experiment can be provided.

Description

technical field [0001] The invention relates to a method for determining the load reduction coefficient on the leeward side of a cross-arm, and more particularly to a method for determining the load reduction coefficient on the leeward side of a power transmission tower cross-arm based on a wind tunnel test. Background technique [0002] In the "Technical Regulations on the Design of Tower Structures for Overhead Transmission Lines", the regulations on the load reduction coefficient on the leeward side are relatively general, and the tower body and cross arms are taken as a fixed value under all wind direction angles. This ignores the difference in shape between the cross-arm and the tower body, and the influence of the change of wind direction angle on the load reduction coefficient of the leeward side. However, the cross-arm is generally higher from the ground and the wind speed is higher, so the value deviation of the load reduction coefficient on the leeward side It has ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50G06Q50/06
Inventor 张宏杰杨风利韩军科杨靖波
Owner STATE GRID CORP OF CHINA
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