Reduction of transformer exciting current to sine-wave basis

Aram Boyajian: For the benefit of those who are not intimately familiar with transformer problems I wish to say that the reduction of core loss and exciting current to a sine-wave basis is not quibbling over laboratory precision. The reduction of the core loss to a sine-wave basis involves wave-shape errors of from zero to 20 per cent, and the reduction of exciting current to a sine-wave basis involves errors of from zero to 50 per cent. The leading manufacturers of the country use methods to reduce core loss to sine-wave basis, and possibly some of them use methods to reduce the exciting current also to sine-wave basis. These methods greatly lessen but do not completely eliminate the possible errors mentioned, due to the fact that the bases of all the methods used in the past have been imperfect. Mr. Camilli therefore has undertaken to develop methods which will have a better basis and will be entirely reliable. I think he has succeeded surpassingly well.