| Laminar flow wind is easily formed in the water surface of large crossing engineering,the aeolain vibration can make the conductor produce alternating stress and strain.When the vibration is strong,it is easy to cause overhead lines tiredness and breaking,which ie threatened the operation safety of transmission lines.Therefore,the vibration control measures must be taken.Due to the nonlinear of aeolain vibration at transmission lines,the vibration control device is not completely determined by theoretical calculation.Therefore,it is necessary to carry out vibration simulation experiment and select reasonable anti-vibration schemes in order to ensure the operating safety of the large crossing.Based on the actual engineering background and the theory and experimental research status of the transmission line anti-vibration prevention at home and abroad,this paper presents the process and principle of aeolian vibration test on conductors,groundwires and OPGW at 220 kV Meijiang river Crossing,which is included in the project of transmission line from Dabu power plant to Jiaying substation and Changsha substation.The tests were mainly designed and carried out to investigate the anti-vibration property of stockbridge dampers,wire dampers and combination anti-vibration to obtain self-damping characteristic expressions of three-type transmission lines at 220 kV Meijiang river Crossing and the frequency response characteristic curve of the conductor when adopted the anti-vibration scheme according to the data results.The tests also obtain the law of change by comparing the anti-vibration effects to propose a reasonable anti-vibration scheme.The test results indicate the number of stockbridge dampers has an great impact on the vibration level,it could changes the vibration characteristics of transmission lines and expand the frequency protection range of the anti-vibration device.The anti-vibration effect of wire dampers depends on its length,the scheme combined stockbridge dampers with wire dampers have an ideal effect.The selective damping scheme have an evident damping effect on the vibration level reduction.So it can ensure the operating safety of transmission lines. |
