DocumentCode :
166920
Title :
Delayed current zeros in FPSO offshore units
Author :
Hernandes, Leonardo ; Zemella Marques, Fabiano ; Vasconcellos, Alexandre S.
Author_Institution :
Figener, Brazil
fYear :
2014
fDate :
25-27 Aug. 2014
Firstpage :
147
Lastpage :
154
Abstract :
It is well established that when short-circuit occurs close to generators´ terminals, the instantaneous value of the fault current through the circuit-breaker may not reach zero amperes for some considerable time, so called delayed current zero phenomenon. Therefore circuit-breakers may not be suitable to clear the fault under this condition. Today´s floating production, storage and offloading (FPSO) units are very large in terms of installed generation capacity, in the range of 100 MVA, and in terms of number of medium voltage motors, many of them connected directly to the generation voltage level. This leads to a very favorable condition for the occurrence of delayed currents zeros in FPSO´s electrical power systems. This paper presents the results obtained in the analysis for a typical FPSO electrical power system. The main objective of this analysis is to verify the presence of delayed currents zeros, the non-zero times and how the system operational condition and type of event may influence the results.
Keywords :
circuit breakers; offshore installations; overcurrent protection; short-circuit currents; FPSO electrical power systems; FPSO offshore units; circuit breakers; delayed current zero phenomenon; floating production storage offloading units; medium voltage motors; short circuit; Circuit faults; Generators; Induction motors; Integrated circuit modeling; Load modeling; Short-circuit currents; Synchronous motors; FPSO; circuit-breaker; delayed current zeros;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Petroleum and Chemical Industry Conference - Brasil (PCIC Brasil), 2014 IEEE
Conference_Location :
Rio de Janeiro
Print_ISBN :
978-1-4799-6660-8
Type :
conf
DOI :
10.1109/PCICBRASIL.2014.6968900
Filename :
6968900
Link To Document :
بازگشت