An extension of the method of symmetrical components using ladder networks

C. Concordia (General Electric Company, Schenectady, N. Y.): In connection with the method of analysis given in this paper it may be of interest to recall a somewhat similar method presented a few years ago (“Overvoltages Caused by Unbalanced Short Circuits,” by Edith Clarke, C. Concordia, and C. N. Weygandt, AIEE Transactions, 1938, volume 57, pages 453–66; see appendix B). This previous method (see latter part of appendix B of the paper referred to) is applicable to the determination of harmonic voltages and currents of an unsymmetrical system containing any number of machines having unsymmetrical rotors, and has been used for the solution of a problem involving two such machines supplying a system with an unbalanced short circuit.