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

Fabio Massimo Gatta, Alberto Geri, Stefano Lauria and Marco Maccioni
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Fabio Massimo Gatta: Department of Astronautics, Electric and Energy Engineering, Sapienza University of Rome, Rome, 00184, Italy
Alberto Geri: Department of Astronautics, Electric and Energy Engineering, Sapienza University of Rome, Rome, 00184, Italy
Stefano Lauria: Department of Astronautics, Electric and Energy Engineering, Sapienza University of Rome, Rome, 00184, Italy
Marco Maccioni: Department of Astronautics, Electric and Energy Engineering, Sapienza University of Rome, Rome, 00184, Italy

Energies, 2016, vol. 9, issue 3, 1-14

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.

Keywords: backflashover rate; HV overhead line; grounding system; ATP-EMTP; Monte Carlo; subsequent strokes (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2016
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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