Discussion on “delta-cross connection of transformers” (Roux), San Francisco, Cal., Sept. 17, 1915. (see proceedings for August, 1915)

E. E. F. Creighton: This double connection of two-phase and three-phase is a great convenience where so many of the systems in the country are being changed over from two-phase to three-phase. There are certain disadvantages in the two-phase system, notably the greater number of surges which occur. Without analyzing the difference, we give it recognition practically by the fact that in a two-phase system of the same voltage as a three-phase system, we have to use more gaps in series in the multi-gap arrester.