Some Notes on the Characteristics of Transformer Group in Extended-Delta Connection

Abstract

In extended-delta connection of single phase transformers, as shown in Fig. 1, we can put on simultaneous loads on two three-phase terminals of different voltage. The relation and limit of these loads for the safe operation of transf-ormers are discussed, and a few examples are calculated and shown by curves. Attention is also drawn to the fact that this connection is superior for its high permissible total Kva. output to other connections, producing two diffe-rent voltage circuits.