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Energies 2016, 9(3), 139; doi:10.3390/en9030139

Monte Carlo Evaluation of the Impact of Subsequent Strokes on Backflashover Rate

Department of Astronautics, Electric and Energy Engineering, Sapienza University of Rome, Rome, 00184, Italy
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Academic Editor: Rodolfo Araneo
Received: 12 January 2016 / Revised: 15 February 2016 / Accepted: 19 February 2016 / Published: 26 February 2016
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Abstract

The paper deals with the impact of subsequent strokes on the backflashover rate (BFR) of HV overhead transmission lines (OHLs), assessed by means of an ATP-EMTP Monte Carlo procedure. The application to a typical 150 kV Italian OHL is discussed, simulating several tower grounding system arrangements. Subsequent strokes parameters are added to the statistical simulation variables: peak current, front time, time-to-half value, lightning polarity, line insulation withstand, lightning location and phase angle of the power frequency voltage. The input data are fed to an ATP-EMTP complete circuit model of the OHL, including line insulation, lightning representation and tower grounding system, the latter simulated by a pi-circuit model able to simulate the effects due to propagation and soil ionization, at modest computational costs. Numerical results evidence a non-negligible BFR increase (in relative terms) due to subsequent strokes: for spatially concentrated grounding systems the BFR increase approximatively vary in inverse proportion with the low frequency grounding resistance, whereas for spatially extended grounding systems the BFR increase depends on the grounding system behavior at high frequencies. View Full-Text
Keywords: backflashover rate; HV overhead line; grounding system; ATP-EMTP; Monte Carlo; subsequent strokes backflashover rate; HV overhead line; grounding system; ATP-EMTP; Monte Carlo; subsequent strokes
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Gatta, F.M.; Geri, A.; Lauria, S.; Maccioni, M. Monte Carlo Evaluation of the Impact of Subsequent Strokes on Backflashover Rate. Energies 2016, 9, 139.

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