Abstract




 
   

IJE TRANSACTIONS A: Basics Vol. 28, No. 10 (October 2015) 1515-1524   

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  AEOLIAN VIBRATIONS OF TRANSMISSION LINE CONDUCTORS WITH MORE THAN ONE DAMPER
 
A. Rezaei and M. H. Sadeghi
 
( Received: June 23, 2015 – Accepted: September 03, 2015 )
 
 

Abstract    To reduce the damages of aeolian vibration of conductors to the power transmission networks, the most common method is installation of Stock-bridge dampers. Estimation of the damper’s dissipated energy is an important factor in determining the number and location of installation of these types of vibration absorbers. This estimation is strongly dependent upon the assumed mode shape of the conductor vibration. The results of current study show that the available methods do not provide an accurate answer for energy dissipation of a conductor with more than one damper. This paper provides a comprehensive method for calculating the mode shapes and dissipated energy in which the effects of travelling wave, amplitude and phase variations, boundary conditions as well as the influence of the number, position, and impedance of the dampers on the mode shape are taken into account. Moreover, the frequency bands of high-amplitude vibration potential can be identified without the need to extract the vibration amplitude.

 

Keywords    Aeolian Vibration, Transmission Line, Stock-bridge Damper, Energy Dissipation

 

چکیده    برای کاهش خسارات ارتعاشات «آولین» رسانا­های خطوط انتقال برق به شبکه­های انتقال توان الکتریکی، رایج­ترین روش استفاده از میراگر «استاک­بریج» است. برآورد انرژی اتلافی میراگر که فاکتور مهمی در تعیین تعداد و محل نصب میراگرهاست، به شدت به شکل مود فرض شده برای ارتعاش رسانا وابسته است. نتایج تحقیق حاضر نشان می­دهد، روش­های موجود نمی­توانند جواب دقیقی برای انرژی اتلافی رسانای دارای بیش از یک میراگر ارایه دهند. در این تحقیق روش جامعی برای محاسبه­ی شکل مود و انرژی اتلافی میراگرهای متعدد نصب شده روی رسانا ارایه می­شود که اثرات روندگی موج، تغییرات دامنه و فاز، شرایط مرزی دو انتها و همچنین تاثیر تعداد، محل نصب و امپدانس میراگر را در شکل مود ارتعاشی لحاظ می­کند. همچنین با استفاده از این روش، می­توان نواحی فرکانسی با پتانسیل ارتعاش بالا را بدون نیاز به محاسبه دامنه ارتعاش، شناسایی کرد.

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