South eastern equipments company supplies power-o-stat autotransformers. The device provides voltage from 0 to 270 v in single phase and 0 to 470 v in three-phase constantly. The turning of the knob in less than a complete circle rotation generates the vibration. This latest version very compact and economical than the existing transformers. The configuration of these units is based on toroidal form. To achieve minimum electrical losses the toroidal core is manufactured by using cold rolled grain oriented silicon steel sheets. The end forms on which the single layer winding is done insulate these cores. Silicon steel enables to accept rated currents without any burden on the units. The winding of the units are very close and the brush arm that rotates is designed in such a way that the brush tap always contacts more than one turn hence before leaving the first turn the brush tap contacts the second turn, hence it gives the uninterrupted output voltages. The capacity of the device ranging from 2 to 1,800 a single/three-phase.
