Written-Pole^® Converter Supplies Quality Three-Phase Power to Remote Load;  Meets Stringent Flicker Specification

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This paper discusses a Remote 3-Phase Power Source.  This is a single-phase Written-Pole® motor connected to a conventional 3-phase generator.  One model uses a 60 HP ride-through motor driving a 180 kW (rated) generator.  The over-size allows the generator to start and run a conventional 50 HP induction motor that has very high start current.  For example, the 480 volt single-phase Written-Pole® motor operates at 100 amp fully loaded.  There is a “velvet start” (option) that starts the machine at 80 amp.  When the 480 volt, 50 horsepower, 3-phase motor load starts, it draws 800 amp per phase on all three phases, even while the distribution line sees only about 180 amp single-phase.  During running, the utility only sees the unity power factor single-phase motor as a load, with complete isolation from any harmonics etc., from the customer load.  Use of a ride-through Written-Pole® motor allows the customer load to continue operation for several seconds during interrupts on the utility (reclosers) and also isolates the customer load from voltage dips and transients.  It is expected rural electric suppliers may use this power source to profitably provide 3-phase power to any customer with any 3-phase load within the Written-Pole® motor limits.

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