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Is selectivity achieved in critical low-voltage UPS and standby generator power circuits?

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3 Author(s)
Cosse, R.E., Jr. ; Powell Electr. Manuf. Co., Houston, TX, USA ; Bowen, J.E. ; Nichols, William H.

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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Industry Applications, IEEE Transactions on  (Volume:37 ,  Issue: 4 )