2 Theory of symmetrical components and connection of phase sequence networks during faults
2.1 General
The analysis of three-phase ac power systems is greatly simplified if the system is assumed perfectly balanced. The three-phase system can then be modelled and analysed on a per-phase basis because knowledge of voltages and currents in one phase allows us to calculate those in the other two phases where they differ by ±120° phase displacement from those of the known phase. However, in practical three-phase power systems, there are a number of sources of unbalance which can be divided into internal and external sources. Internal sources of unbalance are those due to the inherent small differences in the phase impedances and susceptances of ...
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