Equations for evaluating short-circuit forces on multiple-strap single-phase and polyphase busses for supplying low-frequency induction furnaces

THE PURPOSE of this paper is threefold: to advance general equations for calculating the short-circuit forces associated with each subconductor, conductor, and bus support of a multiple-conductor rectangular-strap single-phase or polyphase bus; to illustrate application of these equations in actual design by numerical analyses of several busses typical of the different major types encountered in practice; and to determine the efficiency and relative accuracy of several approximate procedures advanced for reducing the total numerical labor incident to application for a specified bus.