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Answer Posted / ahmed abdel fattah
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The open delta transformer connection can be made with only
two transformers instead of three (figure below). This
connection is often used when the amount of three phase
power needed is not excessive, such as a small business. It
should be noted that the output power of an open delta
connection is only 87% of the rated power of the two
transformers. For example, assume two transformers, each
having a capacity of 25 kVA, are connected in an open delta
connection. The total output power of this connection is
43.5 kVA (50 kVA x 0.87 = 43.5 kVA).
Figure : Open Delta Connection
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