Study of Dynamic Impacts on Transmission-Line Systems Attributable to Conductor Breakage Using the Finite-Element Method
Publication: Journal of Performance of Constructed Facilities
Volume 25, Issue 2
Abstract
The residual static load (RSL) is defined in the ASCE 74 standard as the loading criteria for a broken wire condition. However, a transmission line designed on the basis of the RSL may be unsafe because the RSL takes no account of the dynamic impact effect. This study develops a general finite-element analysis procedure to resolve the conductor breakage problem and to determine the broken wire load (BWL) for the transmission-line design. The developed procedure can account for the impinging and friction effects between the broken conductor and the ground. A three-span transmission line with the line configurations previously tested at full-scale was examined, and the results showed that the developed procedure could predict a realistic time history of responses. The developed procedure was then applied to a nine-span transmission line, and the results showed that the peak BWL was significantly greater than the RSL, indicating that the peak BWL instead of the RSL should be used to check the extreme load case for the conductor’s breakage condition.
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Acknowledgments
This research is partially supported by the National Natural Science Foundation of China under Grant No. NNSFC50638010 and the National Natural Science Foundation of Zhejiang Province, China, under Grant No. NNSFCY1080207. This support is greatly appreciated. The first writer appreciates the financial support from the China Scholarship Council and from Zhejiang University. This scholarship makes his research at Louisiana State University possible. The opinions and statements included in this paper do not necessarily represent those of the sponsors.
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Published In
Journal of Performance of Constructed Facilities
Volume 25 • Issue 2 • April 2011
Pages: 130 - 137
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Jul 15, 2009
Accepted: Feb 25, 2010
Published online: Mar 12, 2010
Published in print: Apr 1, 2011
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