Abstract
IN 1937 Arnold1 published an analytic procedure enabling the designer of a single-phase two conductor bus to determine combinations of conductor spacing and cross section that render the proximity effect zero — hence combinations that render the a-c resistance, and thus the eddy current loss, a minimum. For explicit details the reader is referred to Arnold's paper. For our purpose it suffices to remark that in general the designer is afforded an indefinite number of combinations (of conductor spacing and cross section) from which to choose; that the exact cross sections determined by the theory are not simple in shape; that as the ratio of conductor spacing to perimeter of conductor cross section increases, the equivalent structural shape associated with a particular conductor spacing shifts from rectangular strap to channel to circular or square tubular conductor, that the ac resistance, and hence the eddy-current loss, can be calculated from a given simple formula; and that the accuracy of this formula and the correctness of the general theory are verified by experimental data set forth in the paper.
Published Version
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