Abstract

The effect of first return stroke current distributions of tropical and temperate regions on the assessment of backflashover occurrence of transmission lines is analyzed by means of computational simulations. Current parameters and associated distributions derived from the measurements performed at Morro do Cachimbo station (MCS), Brazil, that comprise 51 negative cloud-to-ground flashes and median first stroke peak current of 43 kA are considered. The results were compared with those obtained from the application of current parameters derived in a temperate region at Mount San Salvatore station (MSS), Switzerland and the cumulative peak current of first strokes recommended by IEEE Std 1243. Sensitivity analyses were developed considering typical configurations of 138-kV and 230-kV transmission lines in a wide range of tower-footing grounding impedance and representative first stroke current waveform. The obtained results revealed about 44 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">%</sup> -to-54 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">%</sup> larger and 54 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">%</sup> -to-28 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">%</sup> lower backflashover probability related to the application of MCS peak current distribution data, in the 20-to-40-Ω tower-footing grounding impedance range, for the 138-kV and 230-kV transmission lines, respectively.

Full Text

Published Version

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.