Title :
Is My UPS Distribution System Coordinated?
Author :
Cossé, Roy E., Jr. ; Dunn, Donald G. ; Spiewak, Robert M.
Author_Institution :
Powell Electr. Manuf. Co., Houston, TX
Abstract :
This paper reviews typical uninterruptible power supply (UPS) distribution systems for the petroleum and chemical industries, focusing on the selectivity of interrupting devices during short-circuit conditions. When selectivity is not achieved, alternative solutions are proposed. Distribution-system-selectivity comparisons are performed for standard circuit-breaker panelboards, fuse panelboards, and custom panelboards utilizing hydraulic magnetic circuit breakers. When remote panels are implemented, application considerations should include oversizing feeder cables or using step-up/step-down transformers. To determine the "ride through" response of operating plant individual UPS loads, the voltage-depression time during UPS distribution-system-fault clearing is compared with the load "ride through" capability. General guidelines are provided for improved UPS distribution-system performance
Keywords :
chemical industry; circuit breakers; petroleum industry; power distribution faults; power transformers; short-circuit currents; uninterruptible power supplies; UPS; chemical industry; custom panelboards; distribution system; feeder cables; fuse panelboards; hydraulic magnetic circuit breakers; petroleum industry; ride through response; short-circuit conditions; standard circuit-breaker panelboards; step-down transformer; step-up transformer; uninterruptible power supply; Chemical industry; Circuit breakers; Distributed control; Electrical equipment industry; Information technology; Petroleum; Programmable control; Pulse width modulation; Uninterruptible power systems; Voltage; Alternate source; Information Technology Equipment (ITE); Information Technology Industry (ITI) curve; distributed control system (DCS); hold-up time; low voltage (LV); molded-case circuit breaker (MCCB); motor control center (MCC); programmable logic controller (PLC); pulsewidth modulated (PWM); safety interlock system (SIS); selectivity; time-current curve (TCC); true online double-conversion uninterruptible power supply (UPS);
Journal_Title :
Industry Applications, IEEE Transactions on
DOI :
10.1109/TIA.2006.882681
