Transcription of Short-Circuit Current Calculations - Cooper Industries
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Short-Circuit Current Calculations - Cooper Industries
237 2014 EatonShort- circuit Current CalculationsBasic Point-to-Point calculation ProcedureStep 1. Determine the transformer full load amps ( ) fromMultiplier = 100*% Ztransformer3 Faultsf = xL xI3 C x n x EL-L1 Line-to-Line (L-L) Faults 2 xL xIL-LSee Note 5 & Table 3f =C x nxEL-L1 Line-to-Neutral (L-N) Faults2 xL xIL-N See Note 5 & Table 3f =C x n xEL-NWhere:L=length (feet) of conductor to the from Table 4 of C values for conductors andTable 5 of C values for busway. n=Number of conductors per phase (adjusts C value forparallel runs)I=Available Short-Circuit Current in amperes at beginningof of primaryM =11 + sym.
238 ©2014Eaton Short-Circuit Current Calculations Three-Phase Short Circuits M 2 1 3 System A Available Utility Infinite Assumption 1500 KVA Transformer 480V, 3Ø, 3.5%Z,
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