Method for obtaining parameter of overhead line subjected to creep elongation

Abstract

The invention provides a method for obtaining a parameter of an overhead line subjected to creep elongation. The method comprises: fitting airborne laser LiDAR point cloud data under an instant working condition to obtain maximum arc sag of a power line under the instant working condition; according to a relation between the maximum arc sag of the power line and a lowest point stress as well as the maximum arc sag of the power line under the instant working condition, calculating the lowest point stress of the power line under the instant working condition; according to the obtained lowest point stress of the power line under the instant working condition, calculating a lowest point stress of the power line under a to-be-calculated working condition; and according to the obtained lowest point stress of the power line under the to-be-calculated working condition, a catenary equation of the power line and the airborne laser LiDAR point cloud data, obtaining a curve of the power line under the to-be-calculated working condition. The power line parameter obtained with the method is high in credibility; uniform standards are provided for measurement of the parameter after the creep elongation; and the method can be used in different working conditions.

Description

technical field [0001] The invention relates to the technical field of intelligent inspection of power transmission lines, in particular to a method for obtaining parameters after plastic creep elongation of overhead lines. Background technique [0002] The power line of overhead line is often made of multi-strand steel wires and aluminum wires. Due to its structural characteristics, the power line is not a complete elastic body. In addition to elastic elongation after stress, it also produces permanent plastic elongation and creep. become elongated. Most of the plastic creep elongation is gradually released after the line is running, increasing the length of the line inside the gear, causing sag to increase and stress to decrease. In the planning and design, although the power line stress and safety system have been calculated based on the theoretical strength of the power line and special working conditions, due to the complex and changeable actual operating conditions, e...

AI Technical Summary

Problems solved by technology

[0005] 2) my country's design regulations stipulate that the plastic elongation of the conductor and ground wire after erection should be determined according to the data provided by the manufacturer or through tests, but only a rough range of plastic elongation is given based on part of the test data and engineering experience, so that the power line The measurement of parameters after plastic creep lacks a unified standard

However, the natural environment is complex, and it is impossible to simulate the power lines damaged by extreme natural disasters and man-made external forces through experimental methods, so it is difficult to predict the plastic creep characteristics of power lines. Therefore, the existing parameter identification methods after plastic creep elongation of power lines are not suitable. applicability

Images