Abstract
The planning and design of transmission systems require the analysis of systems under steady-state as well as under transient conditions. This paper addresses a group of medium-fast transients in six-phase systems created by faults which do not involve any connection between conductors or between conductors and ground. This type of imbalance is referred to as a series fault; it arises, in most instances, when poles of a circuit breaker fail to open, thus creating an unbalanced series impedance condition. The various cases of series faults or open-line faults for six-phase transmission systems are analyzed in this work using the method of symmetrical components and Thévenin's theorem for two-port networks. A numerical algorithm for each of the various series fault cases is also developed here. This will allow us to determine the unbalanced currents resulting from an unbalanced series impedance condition.
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