Delta winding

A type of connection winding used for three-phase alternating-current generators, motors, and transformers. Two of the phase windings are in series, across the third phase winding. The term delta connection comes from the symbol for this type of connection, which is drawn in such a way that it shows the windings arranged in the form of a triangle, or delta. The current flowing between any two leads in a delta-connected circuit is 1.73 times the current flowing in any single winding.