Method for forecasting residual service life of steel-cored aluminum strand overhead conductor

An overhead wire and life prediction technology, which is applied in the direction of applying repeated force/pulsation force to test the strength of materials, can solve the problems that there is no prediction of the remaining life of the overhead wire running state, and achieve the effect of improving safety management and increasing reliability

Inactive Publication Date: 2014-08-06
HEFEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, many scholars at home and abroad have systematically studied the fretting damage of wires, and proposed the basic methods and related equipment for simulating wire fretting damage in the laboratory. Propose a method that can be used for the evaluation of the operating state and remaining life prediction of overhead conductors under the condition of breeze vibration

Method used

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  • Method for forecasting residual service life of steel-cored aluminum strand overhead conductor
  • Method for forecasting residual service life of steel-cored aluminum strand overhead conductor
  • Method for forecasting residual service life of steel-cored aluminum strand overhead conductor

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Embodiment Construction

[0023] In the specific implementation, the conductor fretting simulation experiment device disclosed in the publication number CN 101017715A is used.

[0024] Taking the LJ / G1A-150 / 20 steel-reinforced aluminum-strand overhead conductor that has been in service for 45 years in a certain place as an example, the prediction of the remaining life of the steel-reinforced aluminum-strand overhead conductor is carried out as follows:

[0025] 1. Take a new wire of the same type that has not been put into use, and conduct a fretting simulation experiment on the new wire on a multi-parameter adjustable fretting experimental device, and obtain the same fretting frequency, fretting amplitude and wire axial load of the new wire. Below, the tensile strength Y of aluminum strands corresponding to different fretting times X; set the fretting frequency to 10Hz, the fretting amplitude to 1.0mm, and the axial load of the wire to be 25% of the rated tensile strength of the wire; measure The numb...

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Abstract

The invention discloses a method for forecasting the residual service life of a steel-cored aluminum strand overhead conductor, wherein the method is characterized by forecasting the residual service life Nr of the serviced steel-cored aluminum strand overhead conductor under the condition of aeolian vibration based on the final motion simulation test and the cumulative damage criterion of the steel-cored aluminum strand overhead conductor of a laboratory. The method in the invention has important meanings for improving the safety management level of a transmission line of a power supply unit, and improving the running reliability of a power grid.

Description

technical field [0001] The invention relates to a method for predicting the remaining life of an aluminum-steel stranded overhead wire, which is used for predicting the remaining life of the aluminum-steel stranded overhead wire under the condition of breeze vibration. Background technique [0002] High-voltage transmission lines are composed of overhead conductors, insulators, fittings, towers, foundations and grounding devices. Overhead conductors are the main body of high-voltage transmission lines. At present, the overhead conductors of my country's high-voltage transmission and distribution network are mainly steel-cored aluminum stranded conductors. Overhead wires run in the field for a long time, and are prone to vibration when excited by wind. The study found that the conductor has been in the state of breeze vibration: the vibration frequency is 10-40Hz, and the amplitude is several centimeters. Local micro-slip occurs, causing fretting damage to each contact surf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/32
Inventor 汤文明陈国宏王家庆刘俊健张涛王煦
Owner HEFEI UNIV OF TECH
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