Abstract
The power estimation is performed for the medium/low voltage transformer of a low voltage network. The factors to be accounted for in the estimation are the load density and the fed zone shape. From variously shaped fed zones that of hexagonal shape compactly covers a greater territory and has better indices as compared with rectangles and triangles. The study is framed on an apt canonical model - a circular fed zone with constant continuous load density. The model can be used for comparison of indices at the discrete load dislocation in hexagonal or squared fed zones, extending the results obtained for a circular zone using relative ratios. The transformer power is determined by the fed zone radius, which has a natural limit, since the voltage deviation for the farthest consumer should not exceed the allowable value. Under these conditions, optimization can be performed by a given load density, changing the radius of the fed zone and the density of current in phase conductors.