Title :
Calculation of short circuit currents for sizing electrical equipment
Author :
Laskowski, T.F. ; Hannett, L.N. ; Kostyniak, T.E. ; Pounds, C.G.
Author_Institution :
Power Technol. Inc., Schenectady, NY, USA
Abstract :
Selection of electrical equipment is influenced by the expected magnitudes of the short-circuit currents to which they will be exposed. The widely used application guides ANSI/IEEE C37.010-1979 and C37.5-1979 for AC high-voltage circuit breakers, as well as the IEC standard used in Europe, recommend procedures for determining circuit-breaker duty. These procedures utilize approximate calculations of fault currents. The authors present a method for more accurately approximating fault currents. Calculation of short-circuit currents by the proposed method and by the ANSI method are compared for an industrial power system.<>
Keywords :
circuit breakers; power systems; short-circuit currents; AC high-voltage circuit breakers; ANSI/IEEE standards; IEC standard; circuit-breaker duty; electrical equipment sizing; fault currents; industrial power system; short circuit currents; Circuit breakers; Europe; Fault currents; IEC standards; Industrial power systems; Short circuit currents;
Conference_Titel :
Industry Applications Society Annual Meeting, 1988., Conference Record of the 1988 IEEE
Conference_Location :
Pittsburgh, PA, USA
DOI :
10.1109/IAS.1988.25250
