Inductance of Three Phase Double Circuit with Symmetrical Spacing

       Consider the three phase double circuit with the conductor placed at the vertices of a regular hexagon which is shown in the Fig. 1.
Fig. 1

        Conductor x, y, z are forming one circuit whereas conductors x' , y' and z' are forming another circuit.
       Let us find out flux linkage of conductor x due to currents in other phases.
       since the            Ix + Iy + Iz = 0
...                              Iy + I= - I
       As the conductor are in parallel,
       Inductance of each conductor = 2L

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