Title :
Is selectivity achieved in critical low-voltage UPS and standby generator power circuits?
Author :
Cossé, Roy E., Jr. ; Bowen, James E. ; Nichols, William H.
Author_Institution :
Powell Electr. Manuf. Co., Houston, TX, USA
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
Keywords :
chemical industry; earthing; permanent magnet generators; petroleum industry; power system protection; short-circuit currents; standby generators; switchgear; uninterruptible power supplies; PM generator; automatic transfer switch; critical low-voltage UPS; fault conditions; generator excitation systems; high resistance grounding; petrochemical industry; protective devices; selectivity; self-excited generator; short-circuit conditions; standby generator power circuits; Chemical industry; Circuit faults; Power generation; Power system protection; Power system relaying; Protective relaying; Standby generators; Switches; Uninterruptible power systems; Voltage;
Journal_Title :
Industry Applications, IEEE Transactions on
