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. RMS= Transformer( primaryandf = (%Z) secondaryare100,000 xkVAtransformer3 fault values)1 Transformer( primaryand secondaryaref = primaryxVprimaryx (%Z)1 fault values:100,000 secondaryis L-L)M = 11 + secondary=VprimaryxM primaryVsecondaryeither the nameplate, the following formulas or Table 1:Step 2.

©2014Eaton 239 Short-Circuit Current Calculations Single-Phase Short Circuits Short circuit calculations on a single-phase center tapped transformer system

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