Influence of the Core Form Upon the Iron Losses of Transformers

The effect of the magnetic field distribution upon the iron losses of transformers is represented in practical formulas for the examples of core- and shell-type single-phase punching cores, and of the 3phase core-type core. This computation furnishes as much as 13.5 per cent lower core losses, as compared with previous conventional methods. In another application, it is shown that a widening of the yokes permits only a relatively small reduction in losses.