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N.B Calculation is made on Infinitue Bus Method
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Fault Current CalculationJignesh.Parmar www.electricalnotes.wordpress.com
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Fault Current at Transformer Primary Side (Enter This Value if You know otherwise leave blank)AmpAlu1 Core CableNon-Metalic
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Cu3 Core CableMetalic
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Fault Current At TransformerYes
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Transformer Kva75KvaNo
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Secondary Voltage of Transformer (Line-Line)220Volt
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Secondary Voltage of Transformer (Line-Neutral)127Volt
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Transformer Impedance (Zt)5%
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Transformer Secondary Full Load Current I (Line-Line)197Amp
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Transformer Secondary Full Load Current I (Line-Neutral)295Amp
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KVA Short Circuit At Primary Side
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Source Impedance (Zu)0.0000
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Total Impedance (Z =Zu+Zt)0.0500
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Short Circuit Current RMS Symmetrical3937Amp
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Fault Current At Transformer Secondary ( Isc(L-L)=I (L-L)/Total Impedance)3937Amp
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Fault Current At Transformer Secondary ( Isc(L-N)=I (L-N)/Total Impedance)5905Amp
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Fault Current At Main Panel
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Cable Length from Transformer to Main Panel35Meter
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Type of CableAlu3 Core Cable
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No of Conductor/Phase2
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Size of Phase Conductor55 mm2
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Size of Neutral Conductor55 mm2
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Type of Race WayNon-Metalic
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Phase Conductor Constant (C1)5876
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Neutral Conductor Constant (C2)5876
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F1(L-L) [F(L-L)=(1.732 X Length X Isc)/(C1 X No of Conductor X Volt)]0.092
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F2(L-N) [F(L-L)=(1.732 X Length X Isc)/(C2 X No of Conductor X Volt)]0.240
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M1(L-L) [M=(1/(1+F1)]0.915
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M2(L-N) [M=(1/(1+F2)]0.807
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Fault Current at Main Panel Disconnection (L-L) [Isc X M1]3604Amp
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Fault Current at Main Panel Disconnection (L-N) [Isc X M2]4763Amp
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Fault Current At Sub Panel
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Cable Length from Main Panel to Sub Panel20Meter
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Type of CableCu3 Core Cable
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No of Conductor/Phase1
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Size of Phase Conductor30 mm2
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Size of Neutral Conductor127 mm2
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Type of Race WayNon-Metalic
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Phase Conductor Constant (C1)4833
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Neutral Conductor Constant (C2)19779
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F1(L-L) [F(L-L)=(1.732 X Length X Isc)/(C1 X No of Conductor X Volt)]0.117
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F2(L-N) [F(L-L)=(1.732 X Length X Isc)/(C2 X No of Conductor X Volt)]0.038
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M1(L-L) [M=(1/(1+F1)]0.895
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M2(L-N) [M=(1/(1+F2)]0.963
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Fault Current at Sub Panel Disconnection (L-L) [Isc X M1]3225Amp
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Fault Current at Sub Panel Disconnection (L-N) [Isc X M2]4589Amp
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Fault Current At Distribution Board
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Cable Length from Sub Panel to Distribution Board50Meter
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Type of CableCu1 Core Cable
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No of Conductor/Phase1
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Size of Phase Conductor127 mm2
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Size of Neutral Conductor127 mm2
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Type of Race WayNon-Metalic
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Phase Conductor Constant (C1)18594
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Neutral Conductor Constant (C2)18594
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F1(L-L) [F(L-L)=(1.732 X Length X Isc)/(C1 X No of Conductor X Volt)]0.068
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F2(L-N) [F(L-L)=(1.732 X Length X Isc)/(C2 X No of Conductor X Volt)]0.097
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M1(L-L) [M=(1/(1+F1)]0.936
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M2(L-N) [M=(1/(1+F2)]0.911
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Fault Current at Distribution Board Disconnection (L-L) [Isc X M1]3019Amp
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Fault Current at Distribution Board Disconnection (L-N) [Isc X M2]4182Amp
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