Response of electrical transmission line conductors to extreme wind using field data

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Title: Response of electrical transmission line conductors to extreme wind using field data
Author: Kadaba, Radhakrishna R
Abstract: Conductors are long , slender , flexible , and wind sensitive structures . In most cases of transmission lines , 60 -80 % of wind loads coming to the support structures are transferred from conductors . Thus , assessment of conductor response due to extreme wind is an important part of the overall prediction of wind loads on transmission structures , Extreme winds not only contain high wind speeds but also randomly fluctuating gusts . These gusts cause fluctuating dynamic responses of conductors . Since the responses fluctuate randomly , they need to be assessed in probabilistic terms . An analytical model for estimating dynamic response of transmission line structures to wind loads is developed by Davenport . The model can be verified using field data to determine its effectiveness . Bonneville Power Administration (BPA ) has conducted experimental studies in the field at the Moro site to collect wind and electric transmission structure response data . During 1981 -1982 BPA collected 23 separate 12 -minute duration records that included wind speed , wind direction and conductor response data . The conductor response records include load cell , transverse swing angle , and longitudinal swing angle recordings . The BPA data of wind and conductor response are analyzed in detail to gain as much information as possible . The analysis of wind data include determination of wind characteristics of mean wind profile , turbulence intensities , and gust spectra . The conductor response in terms of peak responses , effective force coefficients , peak factors , and response spectra are obtained . The response spectra are further analyzed to obtain contributions of background response and resonant response . Comparison of the analytical model with field data reveals that the model underestimated background response and overestimated resonant response . Results of these data analyses are used to improve the analytical model to predict conductor response in extreme wind . The significant improvement includes determination of peak factors from upcrossing rates , refinement in the expression for background response and determination of conductor aerodynamic damping ratios from field data .
URI: http : / /hdl .handle .net /2346 /10112
Date: 1988-05

Citation

Kadaba, Radhakrishna R Response of electrical transmission line conductors to extreme wind using field data. Doctoral dissertation, Texas Tech University. Available electronically from http : / /hdl .handle .net /2346 /10112 .

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