Double Windings for Turbine Alternators

Large turbine alternators with two similar independent armature windings have recently been proposed, to permit the electrical segregation of bus sections in large stations without loss of synchronizing power. Several such generators have been installed, or are under construction, and it now seems that they will become of paramount importance in very large future stations. This paper explains the theory, and design limitations of these double winding generators, and describes their application in systems having different types of bus connections.