All three phases are modelled for the unbalanced load flow calculation. All parameters are calculated from the input for the balanced load flow and asymmetrical short-circuit calculations. The network is assumed to be balanced. Single-pole switching is not supported.
Because of the zero-sequence return currents, when earth contacts exist, the zero-sequence impedances have to be defined. If one or more objects have missing zero-sequence parameters, a warning will be displayed.
All loads are balanced loads by default. An unbalanced load can be indicated by clicking the "unbalanced" checkbox.
By clicking the "Unbalanced" checkbox, the "Unbalance" tab will appear. On this tab the load may be specified for each phase (star connection) or between two phases (delta connection).
The calculation of the unbalanced loadflow can be started by Calculate | Extended | Unbalanced loadflow. In the calculation options form the transformer voltage regulators and the P and Q regulators can be enabled.
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