Method and apparatus for transferring between electrical power sources with adaptive blocks transfer until load voltage decays to safe value

摘要

Transfer between alternative electrical power sources (5,7) for highly inductive loads (11), such as motors, is made using an open transition with the load (11) connected to the new source (7,5) only after the voltage on the load bus (9) has fallen below a predetermined value, preferably a value which is about 30% or less of the nominal source voltage.