Title :
IEC medium-voltage circuit-breaker interrupting ratings-unstated short-circuit considerations
Author :
Cossé, Roy E., Jr. ; Hazel, Terence G. ; Thomasset, Georges
Author_Institution :
Kellogg Brown & Root Inc., Houston, TX, USA
Abstract :
International Electrotechnical Commission medium-voltage circuit-breaker interrupting ratings are reviewed using typical petrochemical examples. This paper investigates the complexity of high-magnitude X/R ratios, and short-circuit current zero-axis crossings beyond the interrupting time of the standard circuit-breaker when used for generator applications. Guidelines are provided, enabling the engineer to correctly define the circuit-breakers and switchgear for these applications
Keywords :
IEC standards; circuit breakers; interrupters; short-circuit currents; IEC MV circuit-breaker interrupting ratings; International Electrotechnical Commission; generator applications; high-magnitude X/R ratios; interrupting time; short-circuit current zero-axis crossings; switchgear; unstated short-circuit considerations; Chemical industry; Circuits; Delay; Guidelines; IEC standards; Medium voltage; Petrochemicals; Petroleum; Power engineering and energy; Thermal stresses;
Journal_Title :
Industry Applications, IEEE Transactions on
