Determinação do Factor de Defeito à Terra em Sistemas de Potência com Diferentes Regimes de Neutro (Determination of the Earth Fault Factor in Power Systems for Different Earthed Neutrals)

Maria Rosário Alves Calado (rc@ubi.pt), Sílvio José Pinto Simões Mariano (sm@ubi.pt)


Universidade da Beira Interior
This paper appears in: Revista IEEE América Latina

Publication Date: Dec. 2010
Volume: 8,   Issue: 6 
ISSN: 1548-0992


Abstract:
This paper proposes an analytical method to calculate the earth fault factor (EFF) in power systems, under different neutral earthed possibilities. The magnitude of the EFF depends on the way the neutrals of a system are earthed and influences some important aspects in power systems as the sensitivity and selectivity of relays, the value of short-circuit currents, the overvoltage between lines and earth, the determination of arrester rating and the system insulation level. The obtained results are compared with the values of EFF referred in International Standards.

Index Terms:
Power systems faults, Earth Fault Factor, Grounding, Fault location, Overvoltage protection   


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