G - Physics – 05 – F
Patent
G - Physics
05
F
323/20
G05F 1/70 (2006.01) H02J 3/18 (2006.01)
Patent
CA 1204822
Abstract A power-factor regulator for a three phase line is described. The regulator comprises a delta connected circuit comprising three series circuits connected between the phases. Each series circuit comprises a series capa- citor, optional series reactor coil and a parallel combination of a diode connected in reverse parallel relation across a thyristor. Each thyristor is controlled so that the capacitor is initially charged to about maximum line voltage when the load is open and thereafter the thyristor is switched to close the capacitor and discharge it at the time the line voltage is at or around its maximum after the load is closed. The invention mitigates the effect of impulse waves and eliminates the need for discharge coils. Instead of being connected in the delta circuit the reactor coils may be connected in series between the phases of the line and the delta circuit in the conventional way but to achieve the same wave reforming ability the reactor values have to be doubled when the conventional connection is used.
418822
Fetherstonhaugh & Co.
Kabushiki Kaisha Shinwa Giken
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