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Zhang Y.,East China Grid Company | Yan C.,China Haisum Engineering Co. | Xie Q.,Tongji University
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2010

The current design code requests that wind actions should be considered in the design of icing transmission tower. Taking 1000 kV double circuit transmission lines of an ultra high voltage (UHV) transmission project as the prototype, a large wind tunnel test on icing aeroelastic model was carried out to find out the dynamic interaction of wind-induced vibration for icing transmission tower-line coupling system. The aerodynamic characteristics of the transmission tower-line system were simulated and the boundary conditions were simulated by the equivalent towers. The vibration response of acceleration and displacement were observed in the test. Compared with its counterpart without icing, it was found that the damping ratio in the icing system increased a lot. The dynamic strains of the eight-bundled conductors were measured by using fiber Bragg grating (FBG). The dynamic property variation of the icing conductor and its impact on the transmission tower under the wind load were investigated. The results show that the reasonable dynamic interaction under turbulence flow in the icing tower-line coupling system should be taken into account. © 2010 Chin. Soc. for Elec. Eng. Source


Xie Q.,Tongji University | Li J.,Tongji University | Yan C.,China Haisum Engineering Co. | Zhou Y.,Tongji University
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2013

To clarify the wind load transferring mechanism of tower-line system, a wind tunnel test on a four-span tower-line system model was carried out in TJ-3 wind tunnel at Tongji University with the prototype in the Huainan-Shanghai 1000kV ultra high voltage (UHV) electric power transmission project. An aero-elastic model of the double circuit tower and eight-bundled conductors coupling system was designed. Besides the measurement of acceleration and displacement, Fiber Bragg grating sensors were used to measure the dynamic strain of the conductors, insulators and tower main members. It is found from the analysis that the dynamic characteristics of power transmission tower-line system under wind load are greatly influenced by the tower-conductor coupling effects. As wind speed goes up, the contribution of higher order vibration modes of the conductors to the total energy of the system increases as well. © 2013 Chinese Society for Electrical Engineering. Source


Xie Q.,Tongji University | Guan Z.,Tongji University | Yan C.,China Haisum Engineering Co.
Dianwang Jishu/Power System Technology | Year: 2011

To research across-wind-induced vibration response of ultra high voltage (UHV) transmission tower and that of tower-line coupling system, taking a certain 1000 kV transmission line as research object, through wind tunnel test of aeroelastic model the across-wind-induced vibration responses of both single tower and tower-line coupling system under turbulent flow are researched. Test results show that in turbulent wind field the across-wind-induced vibration response and the along-wind-induced vibration response of single transmission tower are in the same order of magnitude. In tower-line coupling system, the across-wind acceleration response of the tower is larger than that of the single tower; the across-wind displacement response at the end of the crossbeam is larger than that of the single tower and the across-wind displacement response at the tower body is smaller that that of the single tower. The influence of high order vibration modes on the acceleration and displacement responses cannot be neglected, and there is a certain extent of background response involved in displacement response. Thus in the wind force proofing design of UHV transmission tower the influence of across-wind response should be taken into account. Source


Xie Q.,Tongji University | Yan C.-Y.,China Haisum Engineering Co. | Zhang Y.,East China Grid Company
Gaodianya Jishu/High Voltage Engineering | Year: 2010

Vibration of ice covered conductors under low speed wind is a complex problem. It is important to calculate the wind-induced dynamic tension of ice covered conductors for the ice resistant design of transmission towers. By using fiber Bragg grating (FBG) sensors, the dynamic strains of the conductors were measured in the wind tunnel test on a simulated ice covered UHV transmission tower-eight bundled conductors coupling system. Validity of the conductor dynamic tension model was verified in the test. The calculation results of the dynamic tension model were compared with those obtained according to the current design code. The results of the dynamic strain of the ice covered conductor measured in the wind tunnel test and calculated analytically show that , with the increase of the ice thickness, the natural frequencies of the conductors become lower and the nonlinearity of the conductor becomes severe. Especially, the dynamic tension of the conductor end remarkably increases. The chord wise tension load of ice covered conductor calculated by the design code is slightly less than that of the theoretical model. The unequal tension on transmission towers caused by the ice covered conductors will become one of the major causes for possible structural failures. Source


Xie Q.,Tongji University | Yan C.-Y.,China Haisum Engineering Co. | Li S.-Z.,Tongji University
Gaodianya Jishu/High Voltage Engineering | Year: 2010

It is very important to consider the variation of the wind induced dynamic tension in lines when designing the transmission tower-line coupling system subjected to wind. Taking a 1000 kV UHV transmission project under construction as the prototype, we designed a 1000kV double circuit tower-eight bundled conductors coupling system and tested its scaled aeroelastic model in wind tunnel. In the experiment, fiber Bragg grating sensors, for the first time, were used to measure the wind induced dynamic strain of the bundled conductors. The dynamic tension transmission rule and the characteristics of dynamic responses of the conductors were derived from the measured dynamic strains under several different test cases, which differ in wind attack angles, flow fields and wind speeds, etc. Analysis of the strain distribution and the power spectra density at different locations in the conductor verified the energy exchange law between the conductor and the tower in the transmission tower-line coupling system. The results show that the dynamic tension should be considered in wind resistant design of transmission tower-line coupling system. Source

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