H - Electricity – 02 – H
Patent
H - Electricity
02
H
348/29
H02H 7/09 (2006.01) H02H 3/20 (2006.01) H02H 7/04 (2006.01)
Patent
CA 1250941
42 ABSTRACT OF THE DISCLOSURE A programmed overexcitation protective relay with selectable time-overexcitation operation to govern the interruption of energy to a piece of power equipment, like a transformer, generator or the like. A programmed processor is included to derive an overexcitation time-to-trip in accordance with sampled measurement voltage values of at least one power line supplying energy to the power equipment being protected, and selected derivation constants stored in a memory look-up table. The derivation constants are selected from the look-up table based on derivation parameters which may be set and read by the programmed processor from time to time. The programmed processor utilizes the selected deri- vation constants to derive the time-to-trip over a number of predetermined time intervals during which the overexcitation condition persists.
507469
Oldham And Company
Westinghouse Electric Corporation
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