The Scott, or T, Connection

Author: E.E. Kimberly

Remnants of two-phase power systems in this country and the adherence of certain foreign manufacturers to two-phase special equipment sometimes make it desirable to convert power from three-phase to two-phase or vice versa. This transformation may be accomplished by the Scott, or T, connection of two transformers, as in Fig. 17-17.

Fig. 17-17. Scott, or T, Transformer Connections

Two identical transformers may be used, but a tap point B in one of them must be available where 86.6 per cent of the turns have been traversed from C, and a tap at the mid-point must be available in the other. When the line is loaded, the secondary voltages become somewhat unbalanced, but not sufficiently so to cause undesirable performance for most industrial uses.