Power distribution system with means for sensing emergency condition and reducing standby power

摘要

A power generating and distribution system employs primary and emergency back-up standby generators with the primary generator normally powering a conversion supply from which critical supplies are directly connected to a user system and non-critical supplies are selectively connected to the user system through electronic switching devices. The switching means are activated by a monitor control which compares a sample of the primary generator voltage level with a reference level of the generator output powering the conversion supply and generates a control signal to close the electronic switching devices only when the monitor sample exceeds the monitor reference.