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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.

Last Update: 2011-02-23