The lightning performance of an EHV overhead transmission line (OHL) largely depends on tower grounding behavior; when high ground flash density values are expected, a proper design of grounding arrangements, focused on their high frequency behavior instead of the conventional power frequency analysis, can significantly reduce the backflashover rate (BFR) of the OHL. A technical optimization is reported, aiming at improving the BFR of an EHV OHL in Brazil, which crosses a region with widely different soil resistivity values, resulting in a compact tower grounding system design. Although exhibiting a larger resistance at power frequency value, the proposed compact grounding system offers better impulse responses than conventional buried counterpoises.

Design approaches for EHV OHL 'compact' tower grounding systems / Gatta, Fabio Massimo; Geri, Alberto; Maccioni, Marco; Lauria, Stefano; Palone, F.; Pelliccione, G.. - STAMPA. - (2017), pp. 1-6. ((Intervento presentato al convegno 17th IEEE International Conference on Environment and Electrical Engineering and 2017 1st IEEE Industrial and Commercial Power Systems Europe, EEEIC / I and CPS Europe 2017 tenutosi a Milano nel 2017 [10.1109/EEEIC.2017.7977754].

Design approaches for EHV OHL 'compact' tower grounding systems

GATTA, Fabio Massimo;GERI, Alberto;MACCIONI, Marco;LAURIA, Stefano;
2017

Abstract

The lightning performance of an EHV overhead transmission line (OHL) largely depends on tower grounding behavior; when high ground flash density values are expected, a proper design of grounding arrangements, focused on their high frequency behavior instead of the conventional power frequency analysis, can significantly reduce the backflashover rate (BFR) of the OHL. A technical optimization is reported, aiming at improving the BFR of an EHV OHL in Brazil, which crosses a region with widely different soil resistivity values, resulting in a compact tower grounding system design. Although exhibiting a larger resistance at power frequency value, the proposed compact grounding system offers better impulse responses than conventional buried counterpoises.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/999716
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