| Conductor is the important carrier of power transmission, and major constituent part of overhead transmission lines. Aeolian vibration is a risky problem of overhead transmission lines due to the conductor wire broken off sometimes for it. Research on fatigue property, aeolian vibration performance, anti-vibration method and anti-vibration test, then giving an effective measure of anti-vibration for large crossing line will be significant to assure transmission lines safety. Aeolian vibration and its protection of bundled conductors was studied in this thesis. The main research works and conclusions are listed as follows.1) Mathematical modeling of anti-vibration damper components is the base of aeolian vibration study on bundled conductors. The maximal sub-span length of spacers distribution analysis model with different current, different designed meteorological conditions was deduced. The sub-span length was used to prevent the sub-conductors adsorption and sub-span oscillation fault in sub-span. The mathematical mechanical modeling of spacer dampers on aeolian vibration energy dissipation was established by studying the transmission of vibration wave. The Aeolian vibration energy absorbed by spacer damper was calculated and analyzed with the project parameters. The Aeolian vibration level of single conductor and bundled conductors with different spacer dampers location was analysed. The wind power deduction coefficient of bundled conductor was obtained. The study results provided guidance to the design of aeolian anti-vibration method.2) Based on mathematical model and kinematics equation of conductor vibration and the boundary condition of the fatigue test, an analytical relation between fatigue load amplitude and stress distribution at outer of clamp has been established. An calculational method of fatigue test amplitude was presented by means of the Miner's cumulative damage law and the Wohler curve.This method had an advantage over the vibration angle method. Experimental results showed that the fatigue test amplitude calculational method can predict the fatigue test very well, and finishs the question of conductor fatigue test. The relationship between the vibration measurement data and the fatigue life on-site was analyzed. The calculational method was given, which shows how to use the short-term vibration measurement data to calculate the actual conductor fatigue damage in the different weather conditions, and a description example of a project is presented. 3) Used of BP neural network, historical anti-vibration methods of domestic large crossing of transmission lines already running in the field, and the methods test data in the lab, a BP neural network topology was designed. The method of how to acquire the anti-vibration engineering experience was established also. Then the aeolian vibration damper design aids system was developed. A experimental verification by engineering application indicated that the anti-vibration support system can take full advantage of the past, practical engineering knowledge, and effectively guide the design of anti-vibration damper and improve the efficiency of anti-vibration design.4) With special anti-vibration on UHV bundled conductors, an UHV bundled conductors anti-vibration test data processing method was studied and proposed. Based on virtual instrument technology, an aeolian vibration testing and data processing software system was developed and has been applied in a number of projects.5) A damper measure of anti-vibration which was carried out for years was experimentally researched in the lab. A comprehensive assessment of the constituent elements of the anti-vibration measure was given to know the deterioration over time.The test results proved a reliable anti-vibration program, and also given a basis for choice of safety margin of anti-vibration damper design. Finally, this thesis described an study example of a large crossing bundled conductors anti-vibration damper measure design and test. |
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