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Method for calculating load of hanging point of power transmission line tower during conductor galloping

A technology of wire galloping and transmission lines, applied in computing, electrical digital data processing, special data processing applications, etc.

Active Publication Date: 2013-01-02
CHINA ELECTRIC POWER RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Galloping has not been considered as a load case in the current design codes for transmission line poles and towers

Method used

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  • Method for calculating load of hanging point of power transmission line tower during conductor galloping
  • Method for calculating load of hanging point of power transmission line tower during conductor galloping
  • Method for calculating load of hanging point of power transmission line tower during conductor galloping

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Embodiment Construction

[0048] A specific example is now used to introduce the process of using the above method to calculate the load on the tower hanging point of the transmission line when the conductor is galloping.

[0049] Taking the wire model LGJ400 / 35 as an example, the maximum tension of the wire is 39.48kN. The thickness of the ice coating is 5mm, and the mass per unit length of the conductor is m = 1.8kg / m 3 , wire centroid wind speed v=15m / s, meteorological coefficient η=0.20. According to the design conditions of typical transmission lines, the first gear span l 1 =400m, the second gear span l 2 =500m, first calculate the wire galloping amplitude according to step 1, and the values ​​of other parameters and amplitude calculation results in step 1 are as follows:

[0050]

[0051] Calculate galloping frequency according to formula (d) and formula (e) in step 2, ω 1 =3.23rad / s, ω 2 = 2.59 rad / s. When the galloping phase difference Φ of the wires on both sides changes from 0 to 36...

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Abstract

The invention provides a method for calculating the load of a hanging point of a power transmission line tower during conductor galloping. In the method, the conductor galloping amplitude is determined in a weather coefficient method, and the conductor galloping load is determined through theoretical analysis and finite element simulation based on consideration of different influencing factors. The method comprises the following steps: firstly, using a model with two gears and two strain sections to determine the horizontal galloping tension and the tension difference at the hanging point through theoretical analysis under different wind speeds, ice thicknesses, structural parameters of the conductor, gear spans and phase differences; secondly, using a continuous multi-gear model to determine rules of influence of the hanging way and the gear number on the horizontal galloping tension and the tension difference through finite element analysis, and correcting results of the theoreticalcalculation of the two-gear model; and thirdly, transforming the horizontal galloping tension and the tension difference into the load of the hanging point according to the tower type and the rotation angle. The method integrates the influence of the weather, the structural parameters of the conductor, the hanging way, the gear span, the gear number and the like. Compared with the traditional analytical method which adopts the single-gear model, the method has higher applicability and higher accuracy.

Description

technical field [0001] The invention relates to a calculation method for conductor galloping load used in the design of power transmission line pole towers, belonging to the field of calculation of pole tower structure loads in power transmission line design. Background technique [0002] The galloping of transmission line conductors is a kind of low-frequency, large-amplitude self-excited vibration generated by the wind blowing on the conductors with non-circular cross-section due to ice coating. The damage caused by galloping to transmission lines mainly includes two types: electrical damage and mechanical damage. Previous studies mainly focused on two aspects. One is to determine the amplitude and trajectory of conductor galloping, and to determine whether galloping will cause electrical damage such as phase-to-phase flashover or tripping, so as to provide a basis for the electrical design of transmission lines; the other is to design anti-galling devices and optimize the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00
Inventor 杨风利杨靖波付东杰李清华朱宽军韩军科刘操兰张子富吴静
Owner CHINA ELECTRIC POWER RES INST
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