Developments in conversion apparatus for Edison systems

ELECTRICAL energy for Edison systems is most efficiently produced and distributed to substations in the form of alternating current. At the substation it is converted into direct current and distributed to a three-wire network at a suitable voltage. Conversion apparatus for Edison systems has taken the form of motor-generator set, synchronous converter and dynarotor. The voltage-range requirement of this service caused the development of several schemes for effecting voltage range with a synchronous converter. The tap changing switch with the transformer, the induction regulator, the regulating pole construction, the synchronous booster and field control are the forms which have been or are in commercial use.