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A high speed transfer switch is provided for transferring a multiphase load among a number of multiphase A.C. power sources. If the initially selected source deviates from desired limits, the transfer switch transfers the load to an alternate source on a phase-by-phase basis. Antiparallel-connected SCRs are used to allow the load current in each phase to commutate to zero before the load is transferred to the alternate power source.

On the representation of numbers in the form $a_1 X^2_1 + a_1 X^2_2 + a_1 X^2_3 + a_4 W^{l*}$