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Method for calculating creep deformation of lead in tension pay-off process

A wire and tension technology, which is applied in the field of calculation of wire creep during the tension setting-out process of overhead transmission line construction, can solve problems such as difficulty in measuring the entire section of wire creep, and achieve the effect of simple operation and accurate data

Active Publication Date: 2017-01-04
CHINA ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a method for calculating the creep amount of the wire in the process of tension pay-off, which solves the problem that the creep amount of the whole section of wire is difficult to measure in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The inventive implementation steps of the method are as follows: firstly, the creep characteristic of the wire is determined through a creep experiment. Set the experimental temperature to 20°C, and the error of plus or minus does not exceed 2°C; according to the material and cross section of the wire, check the table to determine the wire breaking force RTS; combined with the characteristics of the tension unwinding process, after selecting 15% multiplied by the wire breaking force RTS Get the experimental tension and keep it constant. Measure the creep (deformation) elongation of the wire within 1000 hours, and sample a set of data every 2 hours. According to the laws of material mechanics, the creep rate ε is a function of the creep time t, and the creep rate equation ε=a t b Determined; where ε represents the elongation of the wire due to creep per unit time; a represents the size of the creep amount per unit time; b represents the slope of the creep rate equation ...

Embodiment 2

[0036] The inventive implementation steps of the method are as follows: firstly, the creep characteristic of the wire is determined through a creep experiment. Set the experimental temperature to 20°C, and the error of plus or minus does not exceed 2°C; according to the material and cross section of the wire, check the table to determine the wire breaking force RTS; combined with the characteristics of the tension unwinding process, after selecting 25% multiplied by the wire breaking force RTS Get the experimental tension and keep it constant. Measure the creep (deformation) elongation of the wire within 1500 hours, and sample a set of data every 3 hours. According to the laws of material mechanics, the creep rate ε is a function of the creep time t, and the creep rate equation ε=a t b Determined; where ε represents the elongation of the wire due to creep per unit time; a represents the size of the creep amount per unit time; b represents the slope of the creep rate equation ...

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Abstract

The invention discloses a method for calculating creep deformation of a lead in a tension pay-off process. The method is suitable for calculating the creep deformation of the whole section of lead during construction of an overhead transmission line. The lead starts to generate creep after being dragged from a tension pulley; in the whole pay-off process, stretching times at different positions of the lead are different, and the creep deformation of the whole section of lead is often difficult to measure. The invention provides a calculating method for the creep deformation of the whole section of lead based on an integral principle according to a lead creep rate equation, tension pay-off speed and pay-off time; the creep deformation of the lead in the pay-off process is accurately calculated and a feasible path for developing follow-up work is provided. The method disclosed by the invention can be applied to the fields such as extra-high voltage transmission line construction, open-wire transmission line engineering construction, measurement and control technology and instrumentation, and the like.

Description

technical field [0001] The invention relates to a method for calculating the creep amount of a conductor, in particular to a method for calculating the creep amount of a conductor during the tension setting-out process during the construction of an overhead transmission line. Background technique [0002] The conductor of overhead transmission line will creep due to the effect of tension during operation. The creep amount is related to the tension and duration of the conductor. The greater the tension of the conductor and the longer the duration, the greater the creep of the conductor. Wire creep will cause the length of the wire to increase, which will lead to an increase in arc sag, which will affect the quality and safety of power transmission. The creep elongation characteristics of overhead transmission conductors during operation have been studied continuously at home and abroad. Due to the complexity of the problem, the current main method is still experimental analys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/28
CPCG01N3/28G01N2203/0003G01N2203/0017G01N2203/0071G01N2203/028G01N2203/0682
Inventor 刘胜春赵彦平李裴明刘建军齐翼尹泉
Owner CHINA ELECTRIC POWER RES INST
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