Dynamic Analysis of Asymmetrical Faults using Lyon Transformation

S. Leva and A.P. Morando (Italy)


Power System fault analysis, Asymmetrical faults, Symmetrical Components


Although the application of Symmetrical Components to time-dependent variables was introduced by Lyon in 1954, for many years its application was essentially restricted to electric machines. Recently, thanks to its advantages, the Lyon transformation is also applied to power network calculation. In this paper, time-dependent symmetrical components are applied to study the dynamic analysis of asymmetrical faults in a power system. The Lyon approach allows calculation of the maximum values of overvoltages and overcurrents under transient conditions and allows studying the network under non sinusoidal conditions. Finally, some examples with longitudinal asymmetrical faults are illustrated

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