Why are copper wound transformers better than aluminum?
Aluminum has a tendency to creep due to change in temperature. Creeping is the contraction and expansion of the aluminum conductors. When they creep: the terminal connections loosen, creating a hazard; they eventually burn clear; and shorten the life of the transformer. Copper is more efficient than aluminum. Copper wound transformers general save money; in many cases they pay for themselves over time. • Can the Ultra-K improve harmonic distortion? Yes. There is a 30° phase shift between input and output waveforms. When this shifted waveform is applied against a non-shifted waveform, the 5th and 7th harmonics are greatly reduced. Also, in three phase applications, the triplen harmonics are trapped in the primary of the transformer and are not reflected through the building’s distribution grid. The properly coordinated impedance of the Ultra-K makes it a perfect solution for THD reduction and coordination of fault clearing devices. • How efficient is the Ultra-K? The Ultra-K is 98% effi
