South eastern equipment company provides power-o-stat continuously adjustable voltage auto transformer. This adjustable voltage auto transformer is a device that delivers the voltage from 0-270 v in single phase and 0-470 v in three-phase continuously without any break in output voltage. This variation is obtained by the turning of the knob in less than a complete circle rotation. These units are very compact and very economical comparing to the conventional transformers. Constructional features: toroidal form. Cold rolled grain oriented silicon steel sheets are used to form the toroidal core, which will have minimum electrical losses. The end forms on which the single layer winding is done insulate these cores. Due to silicon steel, the energising current of the unit is negligible and can take rated currents without any burden on the units. Constructional feature includes that ihe winding of the units are very close and the brush arm that rotates is mechanised 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. Capacities range from 2-1,800 a single/three-phase.
