Method and system for identifying test frequency in conductor vibration test

Abstract

The invention provides a method and a system to determine the test frequency in the conductor vibration test. The method comprises the following steps: 1. a shock excitation signal is set, and the shock excitation signal is applied on a shock excitation point to vibrate a conductor to be tested; 2. an incoming frequency is selected to stabilize the vibration of the conductor to be tested at a resonant frequency; 3. the energy of the shock excitation signal is kept unchanged, and the incoming frequency is adjusted so that the virtual value of the vibration velocity of the shock excitation point is minimum; the virtual value of the vibration velocity and the corresponding frequency are recorded; 4.the energy of the shock excitation signal is kept unchanged, and the step 2 and the step 3 are repeated; records of a plurality of virtual values of the vibration velocity and corresponding frequencies are got; 5. the virtual values of the vibration velocity got are compared and the frequency corresponding to the minimum virtual value of the vibration velocity is selected as the test frequency. The invention can determine the test frequency in the conductor vibration test quickly and accurately.

Description

technical field [0001] The present invention relates to the simulation test of conductor vibration indoors, especially the simulation test of conductor vibration caused by breeze, specifically a method and system for determining the test frequency in the conductor vibration test. Background technique [0002] Fatigue disconnection of overhead transmission conductors and lightning conductors (hereinafter collectively referred to as conductors) caused by breeze vibration seriously threatens the safe operation of transmission conductors (especially large-span conductors). In recent years, with the continuous and rapid development of economic construction, the investment in infrastructure construction is also increasing. The "bottleneck" of transmission lines makes the scale of power grid construction continue to expand, and there are more and more large-scale projects. big. Maintaining the stable operation of large-span transmission lines and ensuring the safety of the power g...

AI Technical Summary

Problems solved by technology

However, this frequency is not necessarily the frequency with the largest vibration in the 5Hz, especially after the anti-vibration device is installed on the conductor, the damping of the conductor system changes nonlinearly with the frequency. Therefore, when the frequency is selected at 5Hz intervals, the test The accuracy is greatly affected, which may affect the objective and accurate judgment of the actual vibration level of the wire and the actual vibration-proof effect of the anti-vibration device

[0018] It can be seen that the above-mentioned first and second methods all have their own defects, so a method for finding the test frequency accurately and quickly is needed to make up for the deficiencies in the prior art

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