Is selectivity achieved in critical low-voltage UPS and standbygenerator power circuits? |
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Authors: | Cosse RE Jr Bowen JE Nichols WH |
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Affiliation: | Powell Electr. Manuf. Co., Houston, TX; |
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Abstract: | This paper reviews typical critical low-voltage uninterruptible power supply (UPS) systems and standby generator power circuits used in the petrochemical industry to determine if selectivity is achieved between protective devices during short-circuit conditions. Alternate system configurations are proposed when complete selectivity is not achieved. Generator excitation systems and UPS support during fault conditions is discussed |
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