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US 5,635,772 AGranted
Method and apparatus for transferring between electrical power sources which adaptively blocks transfer until load voltage decays to safe value
AssigneeEaton Corporation
InventorsJames L. Lagree, James R. Hanna, James W. McGill
Life of this patent
Estimating the term…
Abstract
Transfer between alternative electrical power sources for highly inductive loads, such as motors, is made using an open transition with the load connected to the new source only after the voltage on the load bus has fallen below a predetermined value, preferably a value which is about 30% or less of the nominal source voltage.
Claims2
A method of transferring a highly inductive load from one electric power source to another electric power source, said method comprising the steps of:
- disconnecting the highly inductive load from said one electric power source;
- monitoring residual voltage on said highly inductive load;
- and
- connecting the highly inductive load to said another electric power source only after said residual voltage on the highly inductive load has decayed to at least a predetermined value.
1 more element
Dependencies are inferred from the claim text.