.PowerSystems.Blocks.Signals.TransientPhasor .PowerSystems.Blocks.Signals.TransientPhasorThe signal is a two-dimensional vector in polar representation.
Norm and phase change from {a_start, ph_start} to {a_end, ph_end}
at time t_change with a transition duration t_duration.
The transition function is a hyperbolic tangent for both norm and phase.