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

Volume

42

Issue

6

fYear

2006

Firstpage

1565

Lastpage

1573

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);

fLanguage

English

Journal_Title

Industry Applications, IEEE Transactions on

Publisher

ieee

ISSN

0093-9994

Type

jour

DOI

10.1109/TIA.2006.882681

Filename

4012283