Standard Terminal Markings and Connections for Distribution and Power Transformers

Standard terminal markings and connections are described for single-phase andthree-phase distribution, power, and regulating transformers. For terminal markings, it coverssequence designation, external terminal designation, neutral terminal designation, grounded terminal designation, and marking of full and tap winding terminals. Additive and subtractive polarity and parallel transformer operation are described. Connections of single-phase transformers in various configurations and angular displacement of three-phase transformers to connect to various system phase displacements are covered.