I. Introduction
TO MAINTAIN process continuity, motor buses may require transfer from a present source to a new source. The reasons for this may be fault clearing on the present source, deliberate transfer from a utility source to the onsite source during storm periods or for rate savings (and back to utility power at a later time), and deenergization of the present source for maintenance or construction. A simplified one-line diagram is shown in Fig.1. Simplified MBT one-line diagram.