Summing transformer core for star-delta inverter having a separate secondary winding for each primary winding

A summing transformer comprising:

• a core comprising first and second core sections, each of the core sections comprising first, second, and third principal legs;
• a first set of primary windings comprised of primary windings that are wrapped about the principal legs of the first core section, are connected to each other in wye configuration, and are not directly connected to windings from any other set of windings;
• a second set of primary windings comprised of primary windings that are wrapped about the principal legs of the second core section, are connected to each other in delta configuration, and are not directly connected to windings from any other set of windings;
• and
• a group of secondary windings comprised of three sets of secondary windings that are connected to each other in wye configuration and are not directly connected to windings from any other set of windings;
• the first set of secondary windings being comprised of secondary windings that are wrapped about the first principal legs of each of the core sections and are connected in series;
• the second set of secondary windings being comprised of secondary windings that are wrapped about the second principal legs of each of the core sections and are connected in series;
• and
• the third set of secondary windings being comprised of secondary windings that are wrapped about the third principal legs of each of the core sections and are connected in series.