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

Volume

37

Issue

4

fYear

2001

Firstpage

1140

Lastpage

1151

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;

fLanguage

English

Journal_Title

Industry Applications, IEEE Transactions on

Publisher

ieee

ISSN

0093-9994

Type

jour

DOI

10.1109/28.936407

Filename

936407