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6.6KV LPS_3011OBJECTIVEThe purpose of this document is to find the maximum Fault Level attained during a 3 phase Symmetrical fault, on different Buses. In order to arrive at a more correct value, contribution of the Motors towards the fault ratings will also be considered.2REFERENCE DOCUMENTDocumentsDoc. No.a)Overall Plant Electrical Key Single Line Diagram ( 33kV System)b)Electrical Key Single Line Diagramc)Electrical Design BasisDH0008-ENG-E-DB-0001d)Load ListDH0008-ENG-E-DC-0001e)Specification for Transformer (Including Calculations)DH0008-BE-E-SP-00063NOTES57.156a)Base Voltage is 6.6kV and Base MVA is 100MVA throughout the system.8.7479879628b)The impedance of busbars , circuit breakers , current transformers etc. which are negligibly small are not considered in this calculation.c)Sub-transient reactance of high voltage Induction motor is considered to be 17%.d)The short circuit current at the primary terminals (33kV) of the Transformers is 5.25KA as per 33KV fault current rating document .4BASIC DESIGN DATAa.System Data :Source Voltage (Vs)=33kVSource Fault Current (IFS)=5.25kAb.Source Transformer (T1) Data(911-TR-001) :Primary Voltage=33kVSecondary Voltage=6.6kVTransformer capacity=7.5MVATransformer Impedance=6%c.Cable data for TransformerCable between (911-TR-001) Transformer and 6.6KV Switchboard (911-SW2-001) Located in LPS-301.Cable Size & type=1CX400 mm2,Cu,XLPE InsulatedNo. of Cable Runs=1Voltage=6.6KVCable length=22MetersCable Resistance=0.05/Km, at 90CCable Reactance=0.097/Km, at 90Cd.Cable Data for HT Motors (PP-301-01 ) :1Cable Between 6.6kV Switch Board to HV MotorCable Size & type=3C x 95 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=6.6kVCable length=292MetersCable Resistance=0.194/Km, at 90CCable Reactance=0.092/Km, at 90C2Cable Data for HT Motors (PP-301-02 ) :Cable Between 6.6kV Switch Board to HV MotorCable Size & type=3C x 95 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=6.6kVCable length=292MetersCable Resistance=0.194/Km, at 90CCable Reactance=0.092/Km, at 90C3Cable Data for HT Motors (PP-301-03 ) :Cable Between 6.6kV Switch Board to HV MotorCable Size & type=3C x 95 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=6.6kVCable length=292MetersCable Resistance=0.194/Km, at 90CCable Reactance=0.092/Km, at 90C4Cable Data for HT Motors (PP-301-04 ) :Cable Between 6.6kV Switch Board to HV MotorCable Size & type=3C x 95 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=6.6kVCable length=274MetersCable Resistance=0.194/Km, at 90CCable Reactance=0.092/Km, at 90C5Cable Data for HT Motors (PP-301-05 ) :Cable Between 6.6kV Switch Board to HV MotorCable Size & type=3C x 95 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=6.6kVCable length=268MetersCable Resistance=0.194/Km, at 90CCable Reactance=0.092/Km, at 90C6Cable Data for HT Motors (PP-301-06 ) :Cable Between 6.6kV Switch Board to HV MotorCable Size & type=3C x 95 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=6.6kVCable length=262MetersCable Resistance=0.194/Km, at 90CCable Reactance=0.092/Km, at 90C7Cable Data for HT Motors (PP-301-07 ) : FUTURECable Between 6.6kV Switch Board to HV MotorCable Size & type=3C x 95 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=6.6kVCable length=262MetersCable Resistance=0.194/Km, at 90CCable Reactance=0.092/Km, at 90C8Cable Data for HT Motors (PP-301-08 ) : FUTURECable Between 6.6kV Switch Board to HV MotorCable Size & type=3C x 95 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=6.6kVCable length=262MetersCable Resistance=0.194/Km, at 90CCable Reactance=0.092/Km, at 90C9Cable Data for HT Motors (PP-301-09 ) : FUTURECable Between 6.6kV Switch Board to HV MotorCable Size & type=3C x 95 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=6.6kVCable length=262MetersCable Resistance=0.194/Km, at 90CCable Reactance=0.092/Km, at 90C7CALCULATIONA.GENERALa)Basic equation for short circuit calculation is =&WhereBase MVA =100MVABase Voltage =6.6kVZpu =Fault impedance per unitIs =Symmetrical short circuit current (kA)Fault MVA of source =VS X IFS X 1.732b)Machine Impedances are converted to 100MVA base per unit using the following equation :Per unit impedance =B.Fault (F1) at 6.6kV Switchboard : 911-SW2-001a)Source :Fault MVA of source =300MVA(= VS X IFS X 1.732)Source Impedance Zs =0.333PU(= Base MVA /Fault MVA)XS=j0.333, 90 b)Transformer:Transformer rating =7.5MVATransformer secondary No-load voltage =6.6KVImpedance of Transformer T1 , at 6.9kV (Trafo No-load Voltage) =0.06p.uNow, trafo impedance at Base MVA & 6.6 kV Bus Voltage == [ p.u. Trafo Impedance x [ (Trafo No-load Voltage/ Bus Voltage) ] x [ (Base MVA / Trafo MVA) ]= 0.06 x (6.6/6.6) x (100 /7.5)XTR=j0.800, 90 c)HV Motorsi)780KW rated Motor (PP-303-01 TO 06)(3Nos FUTURE)Motor rating =780KW =876KVASub-transient reactance of HV motor = 17 %XM1 = XM2 = XM3= XM4= XM5= XM6= XM7= XM8= XM9=Xd"(p.u.) x (Base MVA x 1000/ Motor kVA) x [ (Trafo No-load Voltage/ Bus Voltage) ] = 0.17 x (100*1000/876) x (6.6/6.6)XM=j19.397, 90 d)Cable16.6kVCable to 911-SW2-001 SWITCHBOARDSize : 1Cx 400 mmR = ( 0.05 x 22) / (2 x 1000) =0.001X = ( 0.097 x 22) / (2 x 1000) =0.002Rpu = R x (Base MVA/(Base kV) )=0.003Xpu = X x (Base MVA/(Base kV) )=0.005ZC1=0.003+0.00662.73, j0.00526.6kVCable to PP-301-01Size : 3Cx 95 mmR = ( 0.194 x 292) / (1 x 1000) =0.057X = ( 0.092 x 292) / (1 x 1000) =0.027Rpu = R x (Base MVA/(Base kV) )=0.130Xpu = X x (Base MVA/(Base kV) )=0.062ZC2=0.130+0.14425.37, j0.06236.6kVCable to PP-301-02Size : 3Cx 95 mmR = ( 0.194 x 292) / (1 x 1000) =0.057X = ( 0.092 x 292) / (1 x 1000) =0.027Rpu = R x (Base MVA/(Base kV) )=0.130Xpu = X x (Base MVA/(Base kV) )=0.062ZC3=0.130+0.14425.37, j0.06246.6kVCable to PP-301-03Size : 3Cx 95 mmR = ( 0.194 x 292) / (1 x 1000) =0.057X = ( 0.092 x 292) / (1 x 1000) =0.027Rpu = R x (Base MVA/(Base kV) )=0.130Xpu = X x (Base MVA/(Base kV) )=0.062ZC4=0.130+0.14425.37, j0.06256.6kVCable to PP-301-04Size : 3Cx 95 mmR = ( 0.194 x 274) / (1 x 1000) =0.053X = ( 0.092 x 274) / (1 x 1000) =0.025Rpu = R x (Base MVA/(Base kV) )=0.122Xpu = X x (Base MVA/(Base kV) )=0.058ZC5=0.122+0.13525.37, j0.05866.6kVCable to PP-301-05Size : 3Cx 95 mmR = ( 0.194 x 268) / (1 x 1000) =0.052X = ( 0.092 x 268) / (1 x 1000) =0.025Rpu = R x (Base MVA/(Base kV) )=0.119Xpu = X x (Base MVA/(Base kV) )=0.057ZC6=0.119+0.13225.37, j0.05776.6kVCable to PP-301-06Size : 3Cx 95 mmR = ( 0.194 x 262) / (1 x 1000) =0.051X = ( 0.092 x 262) / (1 x 1000) =0.024Rpu = R x (Base MVA/(Base kV) )=0.117Xpu = X x (Base MVA/(Base kV) )=0.055ZC7=0.117+0.12925.37, j0.05586.6kVCable to PP-301-07:FUTURESize : 3Cx 95 mmR = ( 0.194 x 262) / (1 x 1000) =0.051X = ( 0.092 x 262) / (1 x 1000) =0.024Rpu = R x (Base MVA/(Base kV) )=0.117Xpu = X x (Base MVA/(Base kV) )=0.055ZC8=0.117+0.12925.37, j0.05596.6kVCable to PP-301-08:FUTURESize : 3Cx 95 mmR = ( 0.194 x 262) / (1 x 1000) =0.051X = ( 0.092 x 262) / (1 x 1000) =0.024Rpu = R x (Base MVA/(Base kV) )=0.117Xpu = X x (Base MVA/(Base kV) )=0.055ZC9=0.117+0.12925.37, j0.055106.6kVCable to PP-301-09:FUTURESize : 3Cx 95 mmR = ( 0.194 x 262) / (1 x 1000) =0.051X = ( 0.092 x 262) / (1 x 1000) =0.024Rpu = R x (Base MVA/(Base kV) )=0.117Xpu = X x (Base MVA/(Base kV) )=0.055ZC10=0.117+0.12925.37, j0.055Z1=ZS+ZTR+ZC1ZS=j0.333ZTR=j0.8ZC1=0.003+j0.005Z1=ZS+ZTR+ZC1=0.003j1.138Z1MAG=1.13889.871/Z1MAG=0.879-89.871/Z1REAL=0.0021/Z1REAC=-0.8791/Z1=0.002j-0.879Z2=ZC2+ZMZC2=0.130+j0.062ZM=j19.397Z2=ZC2+ZM=0.130j19.459Z2MAG=19.46089.621/Z2MAG=0.051-89.621/Z2REAL=0.00031/Z2REAC=-0.05141/Z2=0.0003j-0.051Z3=ZC2+ZMZC3=0.130+j0.062ZM=j19.397Z3=ZC2+ZM=0.130j19.459Z3MAG=19.459589.621/Z3MAG=0.0514-89.621/Z3REAL=0.00031/Z3REAC=-0.05141/Z3=0.0003j-0.051Z4=ZC2+ZMZC4=0.130+j0.062ZM=j19.397Z4=ZC2+ZM=0.130j19.459Z4MAG=19.46089.621/Z4MAG=0.0514-89.621/Z4REAL=0.00031/Z4REAC=-0.05141/Z4=0.0003j-0.051Z5=ZC2+ZMZC5=0.122+j0.058ZM=j19.397Z5=ZC2+ZM=0.122j19.455Z5MAG=19.45689.641/Z5MAG=0.0514-89.641/Z5REAL=0.00031/Z5REAC=-0.0511/Z5=0.0003j-0.051Z6=ZC2+ZMZC6=0.119+j0.057ZM=j19.397Z6=ZC2+ZM=0.119j19.454Z6MAG=19.45489.651/Z6MAG=0.051-89.651/Z6REAL=0.00031/Z6REAC=-0.0511/Z6=0.0003j-0.051Z7=ZC2+ZMZC7=0.117+j0.055ZM=j19.397Z7=ZC2+ZM=0.117j19.453Z7MAG=19.45389.661/Z7MAG=0.0514-89.661/Z7REAL=0.00031/Z7REAC=-0.05141/Z7=0.0003j-0.0514Z8=ZC2+ZMZC8=0.117+j0.055ZM=j19.397Z8=ZC2+ZM=0.117j19.453Z8MAG=19.45389.661/Z8MAG=0.0514-89.661/Z8REAL=0.00031/Z8REAC=-0.0511/Z8=0.0003j-0.051Z9=ZC2+ZMZC9=0.117+j0.055ZM=j19.397Z9=ZC2+ZM=0.117j19.453Z9MAG=19.45389.661/Z9MAG=0.051-89.661/Z9REAL=0.00031/Z9REAC=-0.0511/Z9=0.0003j-0.051Z10=ZC2+ZMZC10=0.117+j0.055ZM=j19.397Z10=ZC2+ZM=0.117j19.453Z10MAG=19.45389.661/Z10MAG=0.051-89.661/Z10REAL=0.00031/Z10REAC=-0.0511/Z10=0.0003j-0.0511/ZEQ=0.005j-1.3411/ZEQMAG=1.341ZEQMAG=0.746Therefore, Maximum Fault level at F1=Base MVAZeq=134.1MVAMaximum Fault level at F1 in KA=134.16.6x1.732=11.73KA

&CSheet &P of &N6.6kV Switchboard :6.6kV Switchboard :6.6k Switchboard :

6.6KV LPS_3021OBJECTIVEThe purpose of this document is to find the maximum Fault Level attained during a 3 phase Symmetrical fault, on different Buses. In order to arrive at a more correct value, contribution of the Motors towards the fault ratings will also be considered.2REFERENCE DOCUMENTDocumentsDoc. No.a)Overall Plant Electrical Key Single Line Diagram ( 33kV System)b)Electrical Key Single Line Diagramc)Electrical Design BasisDH0008-ENG-E-DB-0001d)Load ListDH0008-ENG-E-DC-0001e)Specification for Transformer (Including Calculations)DH0008-BE-E-SP-00063NOTESa)Base Voltage is 6.6kV and Base MVA is 100MVA throughout the system.b)The impedance of busbars , circuit breakers , current transformers etc. which are negligibly small are not considered in this calculation.c)Sub-transient reactance of high voltage Induction motor is considered to be 17%.d)The short circuit current at the primary terminals (33kV) of the Transformers is 5.25KA for 3 sec as per 33KV fault current rating document.4BASIC DESIGN DATAa.System Data :Source Voltage (Vs)=33kVSource Fault Current (IFS)=5.25kAb.Source Transformer (T1) Data(912-TR-001) :Primary Voltage=33kVSecondary Voltage=6.6kVTransformer capacity=7.5MVATransformer Impedance=6%c.Cable data for TransformerCable between (912-TR-001) Transformer and 6.6KV Switchboard (912-SW2-001) Located in LPS-302.Cable Size & type=1CX400 mm2,Cu,XLPE InsulatedNo. of Cable Runs=1Voltage=6.6KVCable length=22MetersCable Resistance=0.05/Km, at 90CCable Reactance=0.097/Km, at 90Cd.Cable Data for HT Motors (PP-302-01 ) :1Cable Between 6.6kV Switch Board to HV MotorCable Size & type=3C x 95 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=6.6kVCable length=292MetersCable Resistance=0.194/Km, at 90CCable Reactance=0.092/Km, at 90C2Cable Data for HT Motors (PP-302-02 ) :Cable Between 6.6kV Switch Board to HV MotorCable Size & type=3C x 95 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=6.6kVCable length=286MetersCable Resistance=0.194/Km, at 90CCable Reactance=0.092/Km, at 90C3Cable Data for HT Motors (PP-302-03 ) :Cable Between 6.6kV Switch Board to HV MotorCable Size & type=3C x 95 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=6.6kVCable length=280MetersCable Resistance=0.194/Km, at 90CCable Reactance=0.092/Km, at 90C4Cable Data for HT Motors (PP-302-04 ) :Cable Between 6.6kV Switch Board to HV MotorCable Size & type=3C x 95 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=6.6kVCable length=274MetersCable Resistance=0.194/Km, at 90CCable Reactance=0.092/Km, at 90C5Cable Data for HT Motors (PP-302-05 ) :Cable Between 6.6kV Switch Board to HV MotorCable Size & type=3C x 95 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=6.6kVCable length=268MetersCable Resistance=0.194/Km, at 90CCable Reactance=0.092/Km, at 90C6Cable Data for HT Motors (PP-302-06 ) :Cable Between 6.6kV Switch Board to HV MotorCable Size & type=3C x 95 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=6.6kVCable length=262MetersCable Resistance=0.194/Km, at 90CCable Reactance=0.092/Km, at 90C7Cable Data for HT Motors (PP-302-07 ) :(FUTURE)Cable Between 6.6kV Switch Board to HV MotorCable Size & type=3C x 95 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=6.6kVCable length=262MetersCable Resistance=0.194/Km, at 90CCable Reactance=0.092/Km, at 90C8Cable Data for HT Motors (PP-302-08 ) :(FUTURE)Cable Between 6.6kV Switch Board to HV MotorCable Size & type=3C x 95 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=6.6kVCable length=262MetersCable Resistance=0.194/Km, at 90CCable Reactance=0.092/Km, at 90C9Cable Data for HT Motors (PP-302-09 ) :(FUTURE)Cable Between 6.6kV Switch Board to HV MotorCable Size & type=3C x 95 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=6.6kVCable length=262MetersCable Resistance=0.194/Km, at 90CCable Reactance=0.092/Km, at 90C7CALCULATIONA.GENERALa)Basic equation for short circuit calculation is =&WhereBase MVA =100MVABase Voltage =6.6kVZpu =Fault impedance per unitIs =Symmetrical short circuit current (kA)Fault MVA of source =VS X IFS X 1.732b)Machine Impedances are converted to 25MVA base per unit using the following equation :Per unit impedance =B.Fault (F1) at 6.6kV Switchboard : 912-SW2-001a)Source :Fault MVA of source =300MVA(= VS X IFS X 1.732)Source Impedance Zs =0.333PU(= Base MVA /Fault MVA)XS=j0.333, 90 b)Transformer:Transformer rating =7.5MVATransformer secondary No-load voltage =6.6KVImpedance of Transformer T1 , at 6.9kV (Trafo No-load Voltage) =0.06p.uNow, trafo impedance at Base MVA & 6.6 kV Bus Voltage == [ p.u. Trafo Impedance x [ (Trafo No-load Voltage/ Bus Voltage) ] x [ (Base MVA / Trafo MVA) ]= 0.08 x (6.6/6.6) x (100 /7.5)XTR=j0.80, 90 c)HV Motorsi)780KW rated Motor (PP-303-01 TO 06)(3Nos FUTURE)Motor rating =780KW =876KVASub-transient reactance of HV motor = 17 %XM1 = XM2 = XM3 = XM4= XM5= XM6= XM7= XM8= XM9=Xd"(p.u.) x (Base MVA x 1000/ Motor kVA) x [ (Trafo No-load Voltage/ Bus Voltage) ] = 0.17 x (100*1000/876) x (6.6/6.6)XM=j19.397, 90 d)Cable16.6kVCable to 912-SW2-001 SWITCHBOARDSize : 1Cx 400 mmR = ( 0.05 x 22) / (2 x 1000) =0.001X = ( 0.097 x 22) / (2 x 1000) =0.002Rpu = R x (Base MVA/(Base kV) )=0.003Xpu = X x (Base MVA/(Base kV) )=0.005ZC1=0.003+0.00662.73, j0.00526.6kVCable to PP-302-01Size : 3Cx 95 mmR = ( 0.194 x 292) / (1 x 1000) =0.057X = ( 0.092 x 292) / (1 x 1000) =0.027Rpu = R x (Base MVA/(Base kV) )=0.130Xpu = X x (Base MVA/(Base kV) )=0.062ZC2=0.130+0.14425.37, j0.06236.6kVCable to PP-302-02Size : 3Cx 95 mmR = ( 0.194 x 292) / (1 x 1000) =0.055X = ( 0.092 x 292) / (1 x 1000) =0.026Rpu = R x (Base MVA/(Base kV) )=0.127Xpu = X x (Base MVA/(Base kV) )=0.060ZC3=0.127+0.14125.37, j0.06046.6kVCable to PP-302-03Size : 3Cx 95 mmR = ( 0.194 x 292) / (1 x 1000) =0.054X = ( 0.092 x 292) / (1 x 1000) =0.026Rpu = R x (Base MVA/(Base kV) )=0.125Xpu = X x (Base MVA/(Base kV) )=0.059ZC4=0.125+0.13825.37, j0.05956.6kVCable to PP-302-04Size : 3Cx 95 mmR = ( 0.194 x 274) / (1 x 1000) =0.053X = ( 0.092 x 274) / (1 x 1000) =0.025Rpu = R x (Base MVA/(Base kV) )=0.122Xpu = X x (Base MVA/(Base kV) )=0.058ZC5=0.122+0.13525.37, j0.05866.6kVCable to PP-302-05Size : 3Cx 95 mmR = ( 0.194 x 268) / (1 x 1000) =0.052X = ( 0.092 x 268) / (1 x 1000) =0.025Rpu = R x (Base MVA/(Base kV) )=0.119Xpu = X x (Base MVA/(Base kV) )=0.057ZC6=0.119+0.13225.37, j0.05776.6kVCable to PP-302-06Size : 3Cx 95 mmR = ( 0.194 x 262) / (1 x 1000) =0.051X = ( 0.092 x 262) / (1 x 1000) =0.024Rpu = R x (Base MVA/(Base kV) )=0.117Xpu = X x (Base MVA/(Base kV) )=0.055ZC7=0.117+0.12925.37, j0.05586.6kVCable to PP-302-07 (FUTURE)Size : 3Cx 95 mmR = ( 0.194 x 262) / (1 x 1000) =0.051X = ( 0.092 x 262) / (1 x 1000) =0.024Rpu = R x (Base MVA/(Base kV) )=0.117Xpu = X x (Base MVA/(Base kV) )=0.055ZC8=0.117+0.12925.37, j0.05596.6kVCable to PP-302-08 (FUTURE)Size : 3Cx 95 mmR = ( 0.194 x 262) / (1 x 1000) =0.051X = ( 0.092 x 262) / (1 x 1000) =0.024Rpu = R x (Base MVA/(Base kV) )=0.117Xpu = X x (Base MVA/(Base kV) )=0.055ZC9=0.117+0.12925.37, j0.055106.6kVCable to PP-302-09 (FUTURE)Size : 3Cx 95 mmR = ( 0.194 x 262) / (1 x 1000) =0.051X = ( 0.092 x 262) / (1 x 1000) =0.024Rpu = R x (Base MVA/(Base kV) )=0.117Xpu = X x (Base MVA/(Base kV) )=0.055ZC10=0.117+0.12925.37, j0.055Z1=ZS+ZTR+ZC1ZS=j0.333ZTR=j0.800ZC1=0.003+j0.005Z1=ZS+ZTR+ZC1=0.003j1.138Z1MAG=1.138289.871/Z1MAG=0.8786-89.871/Z1REAL=0.00191/Z1REAC=-0.87861/Z1=0.002j-0.879Z2=ZC2+ZMZC2=0.130+j0.062ZM=j19.397Z2=ZC2+ZM=0.130j19.459Z2MAG=19.46089.621/Z2MAG=0.051-89.621/Z2REAL=0.00031/Z2REAC=-0.0511/Z2=0.0003j-0.051Z3=ZC2+ZMZC2=0.127+j0.060ZM=j19.397Z3=ZC2+ZM=0.127j19.458Z3MAG=19.45889.621/Z3MAG=0.051-89.621/Z3REAL=0.00031/Z3REAC=-0.0511/Z3=0.0003j-0.051Z4=ZC2+ZMZC2=0.125+j0.059ZM=j19.397Z4=ZC2+ZM=0.125j19.457Z4MAG=19.45789.631/Z4MAG=0.051-89.631/Z4REAL=0.00031/Z4REAC=-0.0511/Z4=0.0003j-0.051Z5=ZC2+ZMZC2=0.122+j0.058ZM=j19.397Z5=ZC2+ZM=0.122j19.455Z5MAG=19.45689.641/Z5MAG=0.051-89.641/Z5REAL=0.00031/Z5REAC=-0.0511/Z5=0.0003j-0.051Z6=ZC2+ZMZC2=0.119+j0.057ZM=j19.397Z6=ZC2+ZM=0.119j19.454Z6MAG=19.45489.651/Z6MAG=0.0514-89.651/Z6REAL=0.00031/Z6REAC=-0.0511/Z6=0.0003j-0.051Z7=ZC2+ZMZC2=0.117+j0.055ZM=j19.397Z7=ZC2+ZM=0.117j19.453Z7MAG=19.45389.661/Z7MAG=0.0514-89.661/Z7REAL=0.00031/Z7REAC=-0.0511/Z7=0.0003j-0.051Z8=ZC2+ZMZC8=0.117+j0.055ZM=j19.397Z8=ZC2+ZM=0.117j19.453Z8MAG=19.45389.661/Z8MAG=0.051-89.661/Z8REAL=0.00031/Z8REAC=-0.0511/Z8=0.0003j-0.051Z9=ZC2+ZMZC9=0.117+j0.055ZM=j19.397Z9=ZC2+ZM=0.117j19.453Z9MAG=19.45389.661/Z9MAG=0.051-89.661/Z9REAL=0.00031/Z9REAC=-0.0511/Z9=0.0003j-0.051Z10=ZC2+ZMZC10=0.117+j0.055ZM=j19.397Z10=ZC2+ZM=0.117j19.453Z10MAG=19.45389.661/Z10MAG=0.051-89.661/Z10REAL=0.00031/Z10REAC=-0.0511/Z10=0.0003j-0.05141/ZEQ=0.0048j-1.3411/ZEQMAG=1.341ZEQMAG=0.746Therefore, Maximum Fault level at F1=Base MVAZeq=134.1MVAMaximum Fault level at F1 in KA=134.1=6.6x1.73211.73KA


6.6KV LPS_3031OBJECTIVEThe purpose of this document is to find the maximum Fault Level attained during a 3 phase Symmetrical fault, on different Buses. In order to arrive at a more correct value, contribution of the Motors towards the fault ratings will also be considered.2REFERENCE DOCUMENTDocumentsDoc. No.a)Overall Plant Electrical Key Single Line Diagram ( 33kV System)b)Electrical Key Single Line Diagramc)Electrical Design BasisDH0008-ENG-E-DB-0001d)Load ListDH0008-ENG-E-DC-0001e)Specification for Transformer (Including Calculations)DH0008-BE-E-SP-00063NOTESa)Base Voltage is 6.6kV and Base MVA is 100MVA throughout the system.b)The impedance of busbars , circuit breakers , current transformers etc. which are negligibly small are not considered in this calculation.c)Sub-transient reactance of high voltage Induction motor is considered to be 17%.d)The short circuit current at the primary terminals (33kV) of the Transformers is 5.25KA for 3 sec as per 33KV fault current rating document.4BASIC DESIGN DATAa.System Data :Source Voltage (Vs)=33kVSource Fault Current (IFS)=5.25kAb.Source Transformer (T1) Data(913-TR-001) :Primary Voltage=33kVSecondary Voltage=6.6kVTransformer capacity=10.5MVATransformer Impedance=8%c.Cable data for TransformerCable between (913-TR-001) Transformer and 6.6KV Switchboard (913-SW2-001) Located in LPS-303.Cable Size & type=1CX400 mm2,Cu,XLPE InsulatedNo. of Cable Runs=2Voltage=6.6KVCable length=22MetersCable Resistance=0.05/Km, at 90CCable Reactance=0.097/Km, at 90Cd.Cable Data for HT Motors (PP-303-01 ) :1Cable Between 6.6kV Switch Board to HV MotorCable Size & type=3C x 95 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=6.6kVCable length=264MetersCable Resistance=0.194/Km, at 90CCable Reactance=0.092/Km, at 90C2Cable Data for HT Motors (PP-303-02 ) :Cable Between 6.6kV Switch Board to HV MotorCable Size & type=3C x 95 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=6.6kVCable length=286MetersCable Resistance=0.194/Km, at 90CCable Reactance=0.092/Km, at 90C3Cable Data for HT Motors (PP-303-03 ) :Cable Between 6.6kV Switch Board to HV MotorCable Size & type=3C x 95 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=6.6kVCable length=280MetersCable Resistance=0.194/Km, at 90CCable Reactance=0.092/Km, at 90C4Cable Data for HT Motors (PP-303-04 ):(FUTURE)Cable Between 6.6kV Switch Board to HV MotorCable Size & type=3C x 95 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=6.6kVCable length=280MetersCable Resistance=0.194/Km, at 90CCable Reactance=0.092/Km, at 90C5Cable Data for HT Motors (PP-303-05):(FUTURE)Cable Between 6.6kV Switch Board to HV MotorCable Size & type=3C x 95 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=6.6kVCable length=280MetersCable Resistance=0.194/Km, at 90CCable Reactance=0.092/Km, at 90C6Cable Data for HT Motors (PP-303-06):(FUTURE)Cable Between 6.6kV Switch Board to HV MotorCable Size & type=3C x 95 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=6.6kVCable length=280MetersCable Resistance=0.194/Km, at 90CCable Reactance=0.092/Km, at 90C7Cable Data for HT Motors (PP-303-07):(FUTURE)Cable Between 6.6kV Switch Board to HV MotorCable Size & type=3C x 95 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=6.6kVCable length=280MetersCable Resistance=0.194/Km, at 90CCable Reactance=0.092/Km, at 90C7CALCULATIONA.GENERALa)Basic equation for short circuit calculation is =&WhereBase MVA =100MVABase Voltage =6.6kVZpu =Fault impedance per unitIs =Symmetrical short circuit current (kA)Fault MVA of source =VS X IFS X 1.732b)Machine Impedances are converted to 25MVA base per unit using the following equation :Per unit impedance =B.Fault (F1) at 6.6kV Switchboard : 913-SW2-001a)Source :Fault MVA of source =300MVA(= VS X IFS X 1.732)Source Impedance Zs =0.333PU(= Base MVA /Fault MVA)XS=j0.333, 90 b)Transformer:Transformer rating =10.5MVATransformer secondary No-load voltage =6.6KVImpedance of Transformer T1 , at 6.9kV (Trafo No-load Voltage) =0.08p.uNow, trafo impedance at Base MVA & 6.6 kV Bus Voltage == [ p.u. Trafo Impedance x [ (Trafo No-load Voltage/ Bus Voltage) ] x [ (Base MVA / Trafo MVA) ]= 0.08 x (6.6/6.6) x (100 /10.5)XTR=j0.8, 90 c)HV Motorsi)1800KW rated Motor (PP-303-01 TO 03) (4nos FUTURE)Motor rating =1800KW =2000KVASub-transient reactance of HV motor = 17 %XM1 = XM2 = XM3= XM4= XM5= XM6= XM7 =Xd"(p.u.) x (Base MVA x 1000/ Motor kVA) x [ (Trafo No-load Voltage/ Bus Voltage) ] = 0.17 x (100*1000/2000) x (6.6/6.6)XM=j8.5, 90 d)Cable16.6kVCable to 913-SW2-001 SWITCHBOARDSize : 1Cx 400 mmR = ( 0.05 x 22) / (2 x 1000) =0.001X = ( 0.097 x 22) / (2 x 1000) =0.001Rpu = R x (Base MVA/(Base kV) )=0.001Xpu = X x (Base MVA/(Base kV) )=0.002ZC1=0.001+0.002862.73, j0.00226.6kVCable to PP-303-01Size : 3Cx 95 mmR = ( 0.194 x 264) / (1 x 1000) =0.051X = ( 0.092 x 264) / (1 x 1000) =0.024Rpu = R x (Base MVA/(Base kV) )=0.118Xpu = X x (Base MVA/(Base kV) )=0.056ZC2=0.118+0.13025.37, j0.05636.6kVCable to PP-303-02Size : 3Cx 95 mmR = ( 0.194 x 286) / (1 x 1000) =0.055X = ( 0.092 x 286) / (1 x 1000) =0.026Rpu = R x (Base MVA/(Base kV) )=0.127Xpu = X x (Base MVA/(Base kV) )=0.060ZC3=0.127+0.14125.37, j0.06046.6kVCable to PP-303-03Size : 3Cx 95 mmR = ( 0.194 x 280) / (1 x 1000) =0.054X = ( 0.092 x 280) / (1 x 1000) =0.026Rpu = R x (Base MVA/(Base kV) )=0.125Xpu = X x (Base MVA/(Base kV) )=0.059ZC4=0.125+0.13825.37, j0.05956.6kVCable to PP-303-04 (FUTURE)Size : 3Cx 95 mmR = ( 0.194 x 280) / (1 x 1000) =0.054X = ( 0.092 x 280) / (1 x 1000) =0.026Rpu = R x (Base MVA/(Base kV) )=0.125Xpu = X x (Base MVA/(Base kV) )=0.059ZC5=0.125+0.13825.37, j0.05966.6kVCable to PP-303-05 (FUTURE)Size : 3Cx 95 mmR = ( 0.194 x 280) / (1 x 1000) =0.054X = ( 0.092 x 280) / (1 x 1000) =0.026Rpu = R x (Base MVA/(Base kV) )=0.125Xpu = X x (Base MVA/(Base kV) )=0.059ZC6=0.125+0.13825.37, j0.05976.6kVCable to PP-303-06 (FUTURE)Size : 3Cx 95 mmR = ( 0.194 x 280) / (1 x 1000) =0.054X = ( 0.092 x 280) / (1 x 1000) =0.026Rpu = R x (Base MVA/(Base kV) )=0.125Xpu = X x (Base MVA/(Base kV) )=0.059ZC7=0.125+0.13825.37, j0.05986.6kVCable to PP-303-07 (FUTURE)Size : 3Cx 95 mmR = ( 0.194 x 280) / (1 x 1000) =0.054X = ( 0.092 x 280) / (1 x 1000) =0.026Rpu = R x (Base MVA/(Base kV) )=0.125Xpu = X x (Base MVA/(Base kV) )=0.059ZC8=0.125+0.13825.37, j0.059Z1=ZS+ZTR+ZC1ZS=j0.333ZTR=j0.762ZC1=0.0013+j0.0024Z1=ZS+ZTR+ZC1=0.0013j1.0976Z1MAG=1.097689.931/Z1MAG=0.9111-89.931/Z1REAL=0.00101/Z1REAC=-0.91111/Z1=0.0010j-0.9111Z2=ZC2+ZMZC2=0.118+j0.056ZM=j8.50Z2=ZC2+ZM=0.118j8.556Z2MAG=8.55789.211/Z2MAG=0.117-89.211/Z2REAL=0.0021/Z2REAC=-0.1171/Z2=0.002j-0.117Z3=ZC2+ZMZC3=0.127+j0.0604ZM=j8.50Z3=ZC2+ZM=0.127j8.560Z3MAG=8.56189.151/Z3MAG=0.117-89.151/Z3REAL=0.0021/Z3REAC=-0.1171/Z3=0.002j-0.117Z4=ZC2+ZMZC4=0.125+j0.059ZM=j8.50Z4=ZC2+ZM=0.125j8.559Z4MAG=8.5689.171/Z4MAG=0.117-89.171/Z4REAL=0.0021/Z4REAC=-0.1171/Z4=0.0017j-0.117Z5=ZC2+ZMZC5=0.125+j0.059ZM=j8.50Z5=ZC2+ZM=0.125j8.559Z5MAG=8.56089.171/Z5MAG=0.117-89.171/Z5REAL=0.0021/Z5REAC=-0.11681/Z5=0.002j-0.117Z6=ZC2+ZMZC6=0.125+j0.059ZM=j8.50Z6=ZC2+ZM=0.125j8.559Z6MAG=8.56089.171/Z6MAG=0.117-89.171/Z6REAL=0.0021/Z6REAC=-0.1171/Z6=0.002j-0.117Z7=ZC2+ZMZC7=0.125+j0.059ZM=j8.50Z7=ZC2+ZM=0.125j8.559Z7MAG=8.56089.171/Z7MAG=0.117-89.171/Z7REAL=0.0021/Z7REAC=-0.1171/Z7=0.002j-0.117Z8=ZC2+ZMZC8=0.125+j0.059ZM=j8.50Z8=ZC2+ZM=0.125j8.559Z8MAG=8.56089.171/Z8MAG=0.117-89.171/Z8REAL=0.0021/Z8REAC=-0.1171/Z8=0.002j-0.1171/ZEQ=0.013j-1.7291/ZEQMAG=1.729ZEQMAG=0.578Therefore, Maximum Fault level at F1=Base MVAZeq=172.9MVAMaximum Fault level at F1 in KA=172.96.6x1.732=15.12KA


DATABASE-MOTORSIMPORTANT NOTES :1THE FULL LOAD CURRENT RATINGS GIVEN BELOW ARE FOR :0V2THESE RATINGS ARE TAKEN FROM M/S SIEMENS CATALOGUE3IF RATINGS OF DIFFERENT MAKE OF MOTORS ARE TO BE USED PLEASE ENTER DATAFROM RELEVANT CATALOGUE IN THE RELEVANT CELLS4Efficiency of motors , rated less than 5.5kW =80%Efficiency of motors , rated 7.5kW upto 75kW =87%Efficiency of motors, rated more than 90kW =90%5P.F. of motors , rated less than 11kW =0.80P.F. of motors , rated 15kW upto 75kW =0.85P.F. of motors, rated more than 90kW =0.90MOTOR RATING ( KW )1.11.52.23.75.57.59.3111518.522303745557590110132150160200250315FLC in Amps.( IL )0.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.000.00000003003780.00

&APage &P

DATABASE-CABLESCABLE SIZE IN MM CABLE RATING INCABLE RATING INCABLE (Multicore)CABLE RATING INCABLE RATING INCABLE RATING INCABLE RESISTANCECABLE REACTANCECABLE RESISTANCECABLE REACTANCEGROUNDDUCTRATING IN AIR (@30C)GROUNDDUCTAIR( Ohm/km, @90 C)( Ohm/km, @90 C)IN AMPS FORIN AMPS FORIN AMPS FORIN AMPS FORIN AMPS FORIN AMPS FORFORFORFORFORCU. CONDUCTORCU. CONDUCTORCU. CONDUCTORAL. CONDUCTORAL. CONDUCTORAL. CONDUCTORCU. CONDUCTORCU. CONDUCTORAL. CONDUCTORAL. CONDUCTOR2.52724322118189.450.10114.50.11543630422823235.880.09298.90.11264538543530303.930.08855.540.104106050754639402.330.08353.70.0991677641006050511.470.08152.30.092599811277663700.9270.08181.440.07935120991589277860.6680.07711.040.07750145125192110951050.4940.07650.770.077701751502461351151300.3420.07540.5320.074952101752981651401550.2470.07270.3850.0741202401953461851551800.1970.07230.3050.0721502702253992101752050.160.07280.2490.0721853002554562352002400.1280.0730.1980.0722403452955382752352800.09890.07220.1520.0713003853356213052603150.08020.07170.1230.0714004253603352903750.06560.09750.071

&A&CPage &P

IncomerProject NoDocument / Item ReferencePlant / Area Ref. :Subject :Issue1Date2Date3Date4Date5Date6DateMade Revised bychecked byApprovedApprovedCALCULATION OF CABLE SIZE FOR THE MCC INCOMING FEEDERSAFOR `1250Amps' ACB INCOMER :Rated Current of the Feeder =1250AmpsSo, derated current = 1250/ 0.66 =0AmpsNow, the current carrying capacity of "300 mm Aluminium" cable in air =315AmpsSo, no. of runs of " 300 mm Al." cable required = 1894/315 =0.000=0Now, Incoming Cable length (L) = 350 mtrs (Approx.)Resistance of 300 mm Al.cable at 70C(Ohm/km) (R) =0.123Reactance of 300 mm Al. Cable at 50Hz(Ohm/km) (X) =0.085P.F. of the load current (cos ) =0.8So,"% Volt.Drop" for 7 runs of 300mm cable =3 IL ( R Cos + X Sin ) 100 L =0, which is more than 3%.1000 x 7 x 415Therefore, no. of runs of " 3C x 300 mm" required from V.D. point of view = 7 * 3.89 / 3 =0Hence, cable selected for the Normal Incomer of the MCC =10 runs of 3C x 300 mm , AYFY cable.BFOR `400Amps' INCOMER :Rated Current of the Feeder =400AmpsSo, derated current = 400/ 0.66 =0AmpsNow, the current carrying capacity of "300 mm Aluminium" cable in air =315AmpsSo, no. of runs of " 300 mm Al." cable required = 606/315 =0.000=0Now, Incoming Cable length (L) = 350 mtrs (Approx.)Resistance of 300 mm Al.cable at 70C(Ohm/km) (R) =0.123Reactance of 300 mm Al. Cable at 50Hz(Ohm/km) (X) =0.085P.F. of the load current (cos ) =0.8So,"% Volt.Drop" for 2 runs of 300mm cable =3 IL ( R Cos + X Sin ) 100 L =0, which is more than 3%.1000 x 2 x 415Therefore, no. of runs of " 3C x 300 mm" required from V.D. point of view = 2 * 4.365 / 3 =0Hence, cable selected for the Normal Incomer of the MCC =3 runs of 3C x 300 mm , AYFY cable.

&RSHEET &P OF 9 SHEETS

COMPAREDOL STARTING OF MOTORSCOMPARESystem Voltage0VDerating Factor0Cos Sin Voltage DropRunning0.0000.0000%0VStarting0.0000.0000%0VMotor Rating in KWUpto 1.11.52.23.75.57.59.3111518.522303745557590110132150FLC in Amps.( IL )00000000000000000000Starting Current in Amps ( Ist ) ie 6 x IL x 1.200000000000000000000No. ofCable sizeResistanceReactanceCurrentDeratedCOMPARECoresin mm in W / Km.in W / Km.Rating (A)Current (A)3 c2.50000000000000000000000003 c4.00000000000000000000000003 c6.00000000000000000000000003 c10.00000000000000000000000003 c16.00000000000000000000000003 c25.00000000000000000000000003 c35.00000000000000000000000003 c50.00000000000000000000000003 c70.00000000000000000000000003 c95.00000000000000000000000003 c120.00000000000000000000000003 c150.00000000000000000000000003 c185.00000000000000000000000003 c240.00000000000000000000000003 c300.00000000000000000000000003 c400.00000000000000000000000002 x 3 c120.00000000000000000000000002 x 3 c150.00000000000000000000000002 x 3 c185.00000000000000000000000002 x 3 c240.0000000000000000000000000STAR - DELTA STARTING OF MOTORSCOMPARESystem Voltage0VDerating Factor0Cos Sin Voltage DropRunning0.0000.0000%0VStarting0.0000.0000%0VMotor Rating in KW5.57.59.3111518.522303745557590110132160200250315FLC in Amps.( IL )00000000000000000300378Starting Current in Amps ( Ist ) ie 2 x IL x 1.2 *00000000000000000720907.2No. ofCable sizeResistanceReactanceCurrentDeratedCOMPARECoresin mm in W / Km.in W / Km.Rating (A)Current (A)2 x 3c2.5000000000000000000000002 x 3c4.0000000000000000000000002 x 3c6.0000000000000000000000002 x 3c10.0000000000000000000000002 x 3c16.0000000000000000000000002 x 3c25.0000000000000000000000002 x 3c35.0000000000000000000000002 x 3c50.0000000000000000000000002 x 3c70.0000000000000000000000002 x 3c95.0000000000000000000000002 x 3c120.0000000000000000000000002 x 3c150.0000000000000000000000002 x 3c185.0000000000000000000000002 x 3c240.0000000000000000000000002 x 3c300.0000000000000000000000002 x 3c400.0000000000000000000000002 x 2 x 3c120.0000000000000000000000002 x 2 x 3c150.0000000000000000000000002 x 2 x 3c185.0000000000000000000000002 x 2 x 3c240.000000000000000000000000

&L&"Arial,Bold"&12HUMPHREYS && GLASGOW CONSULTANTS LTD.&C&"Arial,Bold"&12PROJECT NO : BC 2411

CLIENT : RAMA PETROCHEMICALS LTD.&R&"Arial,Bold"&12DOC NO : B 2411 - E01 - 03SHEET &P OF &N SHEETS

holdDOL STARTING OF MOTORSCABLE SIZING TABLE WITH A STARTING VOLTAGE DROP OF0%System Voltage0VDerating Factor0Cos Sin Voltage DropRunning0.0000.0000%0VStarting0.0000.0000%0VMotor Rating in KWUpto 1.11.52.23.75.57.59.3111518.522303745557590110132FLC in Amps.( IL )0000000000000000000Starting Current in Amps ( Ist )0000000000000000000No. ofCable sizeResistanceReactanceCurrentDeratedLength in MetersCoresin mm in W / Km.in W / Km.Rating (A)Current (A)3 c2.5000000000000000000000003 c4.0000000000000000000000003 c6.0000000000000000000000003 c10.0000000000000000000000003 c16.0000000000000000000000003 c25.0000000000000000000000003 c35.0000000000000000000000003 c50.0000000000000000000000003 c70.0000000000000000000000003 c95.0000000000000000000000003 c120.0000000000000000000000003 c150.0000000000000000000000003 c185.0000000000000000000000003 c240.0000000000000000000000003 c300.0000000000000000000000003 c400.0000000000000000000000003 c500.000000000000000000000000STAR - DELTA STARTING OF MOTORSCABLE SIZING TABLE WITH A STARTING VOLTAGE DROP OF0%System Voltage0VDerating Factor0Cos Sin Voltage DropRunning0.0000.0000%0VStarting0.0000.0000%0VMotor Rating in KW5.57.59.3111518.522303745557590110132160200250315FLC in Amps.( IPh )0000000000000000000Starting Current in Amps ( Ist )0000000000000000000No. ofCable sizeResistanceReactanceCurrentDeratedLength in MetersCoresin mm in W / Km.in W / Km.Rating (A)Current (A)2 x 3c2.5000000000000000000000002 x 3c4.0000000000000000000000002 x 3c6.0000000000000000000000002 x 3c10.0000000000000000000000002 x 3c16.0000000000000000000000002 x 3c25.0000000000000000000000002 x 3c35.0000000000000000000000002 x 3c50.0000000000000000000000002 x 3c70.0000000000000000000000002 x 3c95.0000000000000000000000002 x 3c120.0000000000000000000000002 x 3c150.0000000000000000000000002 x 3c185.0000000000000000000000002 x 3c240.0000000000000000000000002 x 3c300.0000000000000000000000002 x 3c400.0000000000000000000000002 x 3c500.000000000000000000000000



RUNCALDOL STARTING OF MOTORSCABLE SIZING TABLE WITH A RUNNING VOLTAGE DROP OF0%System Voltage0VDerating Factor0Cos Sin Voltage DropRunning0.0000.0000%0VStarting0.0000.0000%0VMotor Rating in KWUpto 1.11.52.23.75.57.59.3111518.522303745557590110132150FLC in Amps.( IL )00000000000000000000Starting Current in Amps ( Ist ) ie 6 x IL x 1.200000000000000000000No. ofCable sizeResistanceReactanceCurrentDeratedMaximum permissible length in metersCoresin mm in W / Km.in W / Km.Rating (A)Current (A)3 c2.50000000000000000000000003 c4.00000000000000000000000003 c6.00000000000000000000000003 c10.00000000000000000000000003 c16.00000000000000000000000003 c25.00000000000000000000000003 c35.00000000000000000000000003 c50.00000000000000000000000003 c70.00000000000000000000000003 c95.00000000000000000000000003 c120.00000000000000000000000003 c150.00000000000000000000000003 c185.00000000000000000000000003 c240.00000000000000000000000003 c300.00000000000000000000000003 c400.00000000000000000000000002 x 3 c120.00000000000000000000000002 x 3 c150.00000000000000000000000002 x 3 c185.00000000000000000000000002 x 3 c240.0000000000000000000000000STAR - DELTA STARTING OF MOTORSCABLE SIZING TABLE WITH A RUNNING VOLTAGE DROP OF0%System Voltage0VDerating Factor0Cos Sin Voltage DropRunning0.0000.0000%0VStarting0.0000.0000%0VMotor Rating in KW5.57.59.3111518.522303745557590110132160200250315FLC in Amps.( IL )00000000000000000300378Starting Current in Amps ( Ist ) ie 2 x IL x 1.2 *00000000000000000720907.2No. ofCable sizeResistanceReactanceCurrentDeratedMaximum permissible length in metersCoresin mm in W / Km.in W / Km.Rating (A)Current (A)2 x 3c2.5000000000000000000000002 x 3c4.0000000000000000000000002 x 3c6.0000000000000000000000002 x 3c10.0000000000000000000000002 x 3c16.0000000000000000000000002 x 3c25.0000000000000000000000002 x 3c35.0000000000000000000000002 x 3c50.0000000000000000000000002 x 3c70.0000000000000000000000002 x 3c95.0000000000000000000000002 x 3c120.0000000000000000000000002 x 3c150.0000000000000000000000002 x 3c185.0000000000000000000000002 x 3c240.0000000000000000000000002 x 3c300.0000000000000000000000002 x 3c400.0000000000000000000000002 x 2 x 3c120.0000000000000000000000002 x 2 x 3c150.0000000000000000000000002 x 2 x 3c185.0000000000000000000000002 x 2 x 3c240.000000000000000000000000



STARTCALDOL STARTING OF MOTORSCABLE SIZING TABLE WITH A STARTING VOLTAGE DROP OF0%System Voltage0VDerating Factor0Cos Sin Voltage DropRunning0.0000.0000%0VStarting0.0000.0000%0VMotor Rating in KWUpto 1.11.52.23.75.57.59.3111518.522303745557590110132150FLC in Amps.( IL )00000000000000000000Starting Current in Amps ( Ist ) ie 6 x IL x 1.2 *00000000000000000000No. ofCable sizeResistanceReactanceCurrentDeratedMaximum permissible length in metersCoresin mm in W / Km.in W / Km.Rating (A)Current (A)3 c2.50000000000000000000000003 c4.00000000000000000000000003 c6.00000000000000000000000003 c10.00000000000000000000000003 c16.00000000000000000000000003 c25.00000000000000000000000003 c35.00000000000000000000000003 c50.00000000000000000000000003 c70.00000000000000000000000003 c95.00000000000000000000000003 c120.00000000000000000000000003 c150.00000000000000000000000003 c185.00000000000000000000000003 c240.00000000000000000000000003 c300.00000000000000000000000003 c400.00000000000000000000000002 x 3 c120.00000000000000000000000002 x 3 c150.00000000000000000000000002 x 3 c185.00000000000000000000000002 x 3 c240.0000000000000000000000000STAR - DELTA STARTING OF MOTORSCABLE SIZING TABLE WITH A STARTING VOLTAGE DROP OF0%System Voltage0VDerating Factor0Cos Sin Voltage DropRunning0.0000.0000%0VStarting0.0000.0000%0VMotor Rating in KW5.57.59.3111518.522303745557590110132160200250315FLC in Amps.( IL )00000000000000000300378Starting Current in Amps ( Ist ) ie 2 x IL x 1.2 *00000000000000000720907.2No. ofCable sizeResistanceReactanceCurrentDeratedMaximum permissible length in metersCoresin mm in W / Km.in W / Km.Rating (A)Current (A)2 x 3c2.5000000000000000000000002 x 3c4.0000000000000000000000002 x 3c6.0000000000000000000000002 x 3c10.0000000000000000000000002 x 3c16.0000000000000000000000002 x 3c25.0000000000000000000000002 x 3c35.0000000000000000000000002 x 3c50.0000000000000000000000002 x 3c70.0000000000000000000000002 x 3c95.0000000000000000000000002 x 3c120.0000000000000000000000002 x 3c150.0000000000000000000000002 x 3c185.0000000000000000000000002 x 3c240.0000000000000000000000002 x 3c300.0000000000000000000000002 x 3c400.0000000000000000000000002 x 2 x 3c120.0000000000000000000000002 x 2 x 3c150.0000000000000000000000002 x 2 x 3c185.0000000000000000000000002 x 2 x 3c240.000000000000000000000000



6.6KV LPS_303 (1)1OBJECTIVEThe purpose of this document is to find the maximum Fault Level attained during a 3 phase Symmetrical fault, on different Buses. In order to arrive at a more correct value, contribution of the Motors towards the fault ratings will also be considered.2REFERENCE DOCUMENTDocumentsDoc. No.a)Overall Plant Electrical Key Single Line Diagram ( 33kV System)b)Electrical Key Single Line Diagramc)Electrical Design BasisDH0008-ENG-E-DB-0001d)Load ListDH0008-ENG-E-DC-0001e)Specification for Transformer (Including Calculations)DH0008-BE-E-SP-00063NOTESa)Base Voltage is 6.6kV and Base MVA is 100MVA throughout the system.b)The impedance of busbars , circuit breakers , current transformers etc. which are negligibly small are not considered in this calculation.c)Sub-transient reactance of high voltage Induction motor is considered to be 17%.d)The short circuit current at the primary terminals (33kV) of the Transformers is 5.25KA for 3 sec as per 33KV fault current rating document.4BASIC DESIGN DATAa.System Data :Source Voltage (Vs)=33kVSource Fault Current (IFS)=5.25kAb.Source Transformer (T1) Data(913-TR-001) :Primary Voltage=33kVSecondary Voltage=6.6kVTransformer capacity=12.5MVATransformer Impedance=8%c.Cable data for TransformerCable between (913-TR-001) Transformer and 6.6KV Switchboard (913-SW2-001) Located in LPS-303.Cable Size & type=1CX400 mm2,Cu,XLPE InsulatedNo. of Cable Runs=2Voltage=6.6KVCable length=22MetersCable Resistance=0.05/Km, at 90CCable Reactance=0.097/Km, at 90Cd.Cable Data for HT Motors (PP-303-01 ) :1Cable Between 6.6kV Switch Board to HV MotorCable Size & type=3C x 95 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=6.6kVCable length=264MetersCable Resistance=0.194/Km, at 90CCable Reactance=0.092/Km, at 90C2Cable Data for HT Motors (PP-303-02 ) :Cable Between 6.6kV Switch Board to HV MotorCable Size & type=3C x 95 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=6.6kVCable length=286MetersCable Resistance=0.194/Km, at 90CCable Reactance=0.092/Km, at 90C3Cable Data for HT Motors (PP-303-03 ) :Cable Between 6.6kV Switch Board to HV MotorCable Size & type=3C x 95 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=6.6kVCable length=280MetersCable Resistance=0.194/Km, at 90CCable Reactance=0.092/Km, at 90C4Cable Data for HT Motors (PP-303-04 ):(FUTURE)Cable Between 6.6kV Switch Board to HV MotorCable Size & type=3C x 95 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=6.6kVCable length=280MetersCable Resistance=0.194/Km, at 90CCable Reactance=0.092/Km, at 90C5Cable Data for HT Motors (PP-303-05):(FUTURE)Cable Between 6.6kV Switch Board to HV MotorCable Size & type=3C x 95 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=6.6kVCable length=280MetersCable Resistance=0.194/Km, at 90CCable Reactance=0.092/Km, at 90C6Cable Data for HT Motors (PP-303-06):(FUTURE)Cable Between 6.6kV Switch Board to HV MotorCable Size & type=3C x 95 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=6.6kVCable length=280MetersCable Resistance=0.194/Km, at 90CCable Reactance=0.092/Km, at 90C7Cable Data for HT Motors (PP-303-07):(FUTURE)Cable Between 6.6kV Switch Board to HV MotorCable Size & type=3C x 95 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=6.6kVCable length=280MetersCable Resistance=0.194/Km, at 90CCable Reactance=0.092/Km, at 90C7CALCULATIONA.GENERALa)Basic equation for short circuit calculation is =&WhereBase MVA =100MVABase Voltage =6.6kVZpu =Fault impedance per unitIs =Symmetrical short circuit current (kA)Fault MVA of source =VS X IFS X 1.732b)Machine Impedances are converted to 25MVA base per unit using the following equation :Per unit impedance =B.Fault (F1) at 6.6kV Switchboard : 913-SW2-001a)Source :Fault MVA of source =300MVA(= VS X IFS X 1.732)Source Impedance Zs =0.333PU(= Base MVA /Fault MVA)XS=j0.333, 90 b)Transformer:Transformer rating =12.5MVATransformer secondary No-load voltage =6.6KVImpedance of Transformer T1 , at 6.9kV (Trafo No-load Voltage) =0.08p.uNow, trafo impedance at Base MVA & 6.6 kV Bus Voltage == [ p.u. Trafo Impedance x [ (Trafo No-load Voltage/ Bus Voltage) ] x [ (Base MVA / Trafo MVA) ]= 0.08 x (6.6/6.6) x (100 /10.5)XTR=j0.6, 90 c)HV Motorsi)1800KW rated Motor (PP-303-01 TO 03) (4nos FUTURE)Motor rating =1800KW =2000KVASub-transient reactance of HV motor = 17 %XM1 = XM2 = XM3= XM4= XM5= XM6= XM7 =Xd"(p.u.) x (Base MVA x 1000/ Motor kVA) x [ (Trafo No-load Voltage/ Bus Voltage) ] = 0.17 x (100*1000/2000) x (6.6/6.6)XM=j8.5, 90 d)Cable16.6kVCable to 913-SW2-001 SWITCHBOARDSize : 1Cx 400 mmR = ( 0.05 x 22) / (2 x 1000) =0.001X = ( 0.097 x 22) / (2 x 1000) =0.001Rpu = R x (Base MVA/(Base kV) )=0.001Xpu = X x (Base MVA/(Base kV) )=0.002ZC1=0.001+0.002862.73, j0.00226.6kVCable to PP-303-01Size : 3Cx 95 mmR = ( 0.194 x 264) / (1 x 1000) =0.051X = ( 0.092 x 264) / (1 x 1000) =0.024Rpu = R x (Base MVA/(Base kV) )=0.118Xpu = X x (Base MVA/(Base kV) )=0.056ZC2=0.118+0.13025.37, j0.05636.6kVCable to PP-303-02Size : 3Cx 95 mmR = ( 0.194 x 286) / (1 x 1000) =0.055X = ( 0.092 x 286) / (1 x 1000) =0.026Rpu = R x (Base MVA/(Base kV) )=0.127Xpu = X x (Base MVA/(Base kV) )=0.060ZC3=0.127+0.14125.37, j0.06046.6kVCable to PP-303-03Size : 3Cx 95 mmR = ( 0.194 x 280) / (1 x 1000) =0.054X = ( 0.092 x 280) / (1 x 1000) =0.026Rpu = R x (Base MVA/(Base kV) )=0.125Xpu = X x (Base MVA/(Base kV) )=0.059ZC4=0.125+0.13825.37, j0.05956.6kVCable to PP-303-04 (FUTURE)Size : 3Cx 95 mmR = ( 0.194 x 280) / (1 x 1000) =0.054X = ( 0.092 x 280) / (1 x 1000) =0.026Rpu = R x (Base MVA/(Base kV) )=0.125Xpu = X x (Base MVA/(Base kV) )=0.059ZC5=0.125+0.13825.37, j0.05966.6kVCable to PP-303-05 (FUTURE)Size : 3Cx 95 mmR = ( 0.194 x 280) / (1 x 1000) =0.054X = ( 0.092 x 280) / (1 x 1000) =0.026Rpu = R x (Base MVA/(Base kV) )=0.125Xpu = X x (Base MVA/(Base kV) )=0.059ZC6=0.125+0.13825.37, j0.05976.6kVCable to PP-303-06 (FUTURE)Size : 3Cx 95 mmR = ( 0.194 x 280) / (1 x 1000) =0.054X = ( 0.092 x 280) / (1 x 1000) =0.026Rpu = R x (Base MVA/(Base kV) )=0.125Xpu = X x (Base MVA/(Base kV) )=0.059ZC7=0.125+0.13825.37, j0.05986.6kVCable to PP-303-07 (FUTURE)Size : 3Cx 95 mmR = ( 0.194 x 280) / (1 x 1000) =0.054X = ( 0.092 x 280) / (1 x 1000) =0.026Rpu = R x (Base MVA/(Base kV) )=0.125Xpu = X x (Base MVA/(Base kV) )=0.059ZC8=0.125+0.13825.37, j0.059Z1=ZS+ZTR+ZC1ZS=j0.333ZTR=j0.640ZC1=0.0013+j0.0024Z1=ZS+ZTR+ZC1=0.0013j0.9757Z1MAG=0.975789.931/Z1MAG=1.0249-89.931/Z1REAL=0.00131/Z1REAC=-1.02491/Z1=0.0013j-1.0249Z2=ZC2+ZMZC2=0.118+j0.056ZM=j8.50Z2=ZC2+ZM=0.118j8.556Z2MAG=8.55789.211/Z2MAG=0.117-89.211/Z2REAL=0.0021/Z2REAC=-0.1171/Z2=0.002j-0.117Z3=ZC2+ZMZC3=0.127+j0.0604ZM=j8.50Z3=ZC2+ZM=0.127j8.560Z3MAG=8.56189.151/Z3MAG=0.117-89.151/Z3REAL=0.0021/Z3REAC=-0.1171/Z3=0.002j-0.117Z4=ZC2+ZMZC4=0.125+j0.059ZM=j8.50Z4=ZC2+ZM=0.125j8.559Z4MAG=8.5689.171/Z4MAG=0.117-89.171/Z4REAL=0.0021/Z4REAC=-0.1171/Z4=0.0017j-0.117Z5=ZC2+ZMZC5=0.125+j0.059ZM=j8.50Z5=ZC2+ZM=0.125j8.559Z5MAG=8.56089.171/Z5MAG=0.117-89.171/Z5REAL=0.0021/Z5REAC=-0.11681/Z5=0.002j-0.117Z6=ZC2+ZMZC6=0.125+j0.059ZM=j8.50Z6=ZC2+ZM=0.125j8.559Z6MAG=8.56089.171/Z6MAG=0.117-89.171/Z6REAL=0.0021/Z6REAC=-0.1171/Z6=0.002j-0.117Z7=ZC2+ZMZC7=0.125+j0.059ZM=j8.50Z7=ZC2+ZM=0.125j8.559Z7MAG=8.56089.171/Z7MAG=0.117-89.171/Z7REAL=0.0021/Z7REAC=-0.1171/Z7=0.002j-0.117Z8=ZC2+ZMZC8=0.125+j0.059ZM=j8.50Z8=ZC2+ZM=0.125j8.559Z8MAG=8.56089.171/Z8MAG=0.117-89.171/Z8REAL=0.0021/Z8REAC=-0.1171/Z8=0.002j-0.1171/ZEQ=0.013j-1.8431/ZEQMAG=1.843ZEQMAG=0.543Therefore, Maximum Fault level at F1 =Base MVAZeq=184.3MVAMaximum Fault level at F1 in KA=184.36.6x1.732=16.12KA

&CSheet &P of &N

Main Consumer SS 1OBJECTIVEThe purpose of this document is to find the maximum Fault Level attained during a 3 phase Symmetrical fault, on different Buses. In order to arrive at a more correct value, contribution of the Motors towards the fault ratings will also be considered.2REFERENCE DOCUMENTDocumentsDoc. No.a)Overall Plant Electrical Key Single Line Diagram ( 33kV System)b)Electrical Key Single Line Diagramc)Electrical Design BasisDH0008-ENG-E-DB-0001d)Load ListDH0008-ENG-E-DC-0001e)Specification for Transformer (Including Calculations)DH0008-BE-E-SP-00063NOTESa)Base Voltage is 0.433kV and Base MVA is 100MVA throughout the system.b)The impedance of busbars , circuit breakers , current transformers etc. which are negligibly small are not considered in this calculation.c)Sub-transient reactance of low voltage Induction motor is considered to be 17%.d)The short circuit current at the primary terminals (33kV) of the Transformers is 5.25KA as per 33KV fault current document.4BASIC DESIGN DATAa.System Data:Source Voltage (Vs)=33kVSource Fault Current (IFS)=5.25kAb.Source Transformer (T1) Data ( 910-TR-001):Primary Voltage=33kVSecondary Voltage=0.433kVTransformer capacity=1MVATransformer Impedance=5%c.Cable data for TransformerCable between (910-TR-001) Transformer and 0.433KV Switchboard (910-SW3-001) Located in Main Consumer Substation.Cable Size & type=1CX630 mm2,Cu,XLPE InsulatedNo. of Cable Runs=2Voltage=0.433KVCable length=22MetersCable Resistance=0.035/Km, at 90CCable Reactance=0.084/Km, at 90Cd.Cable Data for DB :1Cable Between 910-SW3-001 Board and 910-JP-DB-001(FIRE JOCKEY PUMP) DBCable Size & type=4C x 120 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.433kVCable length=605MetersCable Resistance=0.156/Km, at 90CCable Reactance=0.072/Km, at 90C2Cable Between 910-SW3-001 Board and FS-DB-001(FIRE STATION) DBCable Size & type=4C x 35 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.433kVCable length=372MetersCable Resistance=0.525/Km, at 90CCable Reactance=0.079/Km, at 90C3Cable Between 910-SW3-001 Board and WS-DB-001(WORKSHOP) DBCable Size & type=4C x70 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.433kVCable length=372MetersCable Resistance=0.269/Km, at 90CCable Reactance=0.074/Km, at 90C4Cable Between 910-SW3-001 Board and ADM-SSB-001(ADMN BLDG &CONTROL ROOM) DBCable Size & type=4C x150 mm2, XLPE insulatedNo. of Cable Runs=2Voltage=0.433kVCable length=341MetersCable Resistance=0.128/Km, at 90CCable Reactance=0.072/Km, at 90C5Cable Between 910-SW3-001 Board and RC-DB-001(REFUSE CHAMBER) DBCable Size & type=4C x25 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.433kVCable length=372MetersCable Resistance=0.727/Km, at 90CCable Reactance=0.081/Km, at 90C6Cable Between 910-SW3-001 Board and PS-DB-001(PUMP SHED) DBCable Size & type=4C x35 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.433kVCable length=540MetersCable Resistance=0.525/Km, at 90CCable Reactance=0.079/Km, at 90C7Cable Between 910-SW3-001 Board and LAB-DB-002 DBCable Size & type=4C x35 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.433kVCable length=372MetersCable Resistance=0.525/Km, at 90CCable Reactance=0.079/Km, at 90C8Cable Between 910-SW3-001 Board and FS-DB-002 (FIRE STATION) DBCable Size & type=4C x35 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.433kVCable length=372MetersCable Resistance=0.525/Km, at 90CCable Reactance=0.079/Km, at 90C9Cable Between 910-SW3-001 Board and ADM-ESSB-001(ADMN BLDG & CONTROL ROOM) DBCable Size & type=4C x50 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.433kVCable length=372MetersCable Resistance=0.388/Km, at 90CCable Reactance=0.075/Km, at 90C10Cable Between 910-SW3-001 Board and 114-FP-01-SL(OUTDOOR LIGHTING) DBCable Size & type=4C x50 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.433kVCable length=500MetersCable Resistance=0.388/Km, at 90CCable Reactance=0.075/Km, at 90C11Cable Between 910-SW3-001 Board and LCP-940-02A/B(SERVICE WATER PUMP) DBCable Size & type=4C x50 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.433kVCable length=708MetersCable Resistance=0.388/Km, at 90CCable Reactance=0.075/Km, at 90C12Cable Between 910-SW3-001 Board and LCP-941-01A/B(FRESHWATER PUMP) DBCable Size & type=4C x50 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.433kVCable length=708MetersCable Resistance=0.388/Km, at 90CCable Reactance=0.075/Km, at 90C13Cable Between 910-SW3-001 Board and 910-DB-001(33KV CONSUMER SS) DBCable Size & type=4C x35 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.433kVCable length=54MetersCable Resistance=0.525/Km, at 90CCable Reactance=0.079/Km, at 90C14Cable Between 910-SW3-001 Board and LAB-DB-001(LABORATORY/SAMPLE ROOM) DBCable Size & type=4C x35 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.433kVCable length=372MetersCable Resistance=0.525/Km, at 90CCable Reactance=0.079/Km, at 90C15Cable Between 910-SW3-001 Board and AC-CS-SR-01(AIR COND PANEL ) DBCable Size & type=4C x35 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.433kVCable length=20MetersCable Resistance=0.525/Km, at 90CCable Reactance=0.079/Km, at 90C16Cable Between 910-SW3-001 Board and AC-CS-SGR-01(AIR COND PANEL ) DBCable Size & type=4C x25 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.433kVCable length=24MetersCable Resistance=0.727/Km, at 90CCable Reactance=0.081/Km, at 90C17Cable Between 910-SW3-001 Board and 910-UPS-001(AC UPS ) DBCable Size & type=4C x25 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.433kVCable length=54MetersCable Resistance=0.727/Km, at 90CCable Reactance=0.081/Km, at 90C18Cable Between 910-SW3-001 Board and 910-UPS-001(AC UPS BYPASS ) DBCable Size & type=4C x25 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.433kVCable length=54MetersCable Resistance=0.727/Km, at 90CCable Reactance=0.081/Km, at 90C19Cable Between 910-SW3-001 Board and 910-UPS-002(DC UPS ) DBCable Size & type=4C x16 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.433kVCable length=54MetersCable Resistance=1.15/Km, at 90CCable Reactance=0.081/Km, at 90C20Cable Between 910-SW3-001 Board and 910-UPS-003(DC UPS ) DBCable Size & type=4C x16 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.433kVCable length=54MetersCable Resistance=1.15/Km, at 90CCable Reactance=0.081/Km, at 90C21Cable Between 910-SW3-001 Board and ADM-UPS-001(AC UPS) DBCable Size & type=4C x35 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.433kVCable length=372MetersCable Resistance=0.525/Km, at 90CCable Reactance=0.079/Km, at 90C22Cable Between 910-SW3-001 Board and ADM-UPS-001(AC UPS BYPASS) DBCable Size & type=4C x35 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.433kVCable length=372MetersCable Resistance=0.525/Km, at 90CCable Reactance=0.079/Km, at 90C23Cable Between 910-SW3-001 Board and 910-DB-002(33KV CONSUMER SS) DBCable Size & type=4C x25 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.433kVCable length=54MetersCable Resistance=0.727/Km, at 90CCable Reactance=0.081/Km, at 90C24Cable Between 910-SW3-001 Board and LAB-DB-003(LABORATORY/SAMPLE ROOM) DBCable Size & type=4C x35 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.433kVCable length=372MetersCable Resistance=0.525/Km, at 90CCable Reactance=0.079/Km, at 90C25Cable Between 910-SW3-001 Board and 910-FP-01-SL(OUTDOOR LIGHTING) DBCable Size & type=4C x25 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.433kVCable length=96MetersCable Resistance=0.727/Km, at 90CCable Reactance=0.081/Km, at 90C26Cable Between 910-SW3-001 Board and TNB-DB-001L(TNB SUBSTATION) DBCable Size & type=4C x50 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.433kVCable length=144MetersCable Resistance=0.388/Km, at 90CCable Reactance=0.075/Km, at 90C27Cable Between 910-SW3-001 Board and WH-DB-001(WARE HOUSE) DBCable Size & type=4C x50 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.433kVCable length=368MetersCable Resistance=0.388/Km, at 90CCable Reactance=0.075/Km, at 90C7CALCULATIONA.GENERALa)Basic equation for short circuit calculation is =&WhereBase MVA =100MVABase Voltage =0.433kVZpu =Fault impedance per unitIs =Symmetrical short circuit current (kA)Fault MVA of source =VS X IFS X 1.732b)Machine Impedances are converted to 100MVA base per unit using the following equation :Per unit impedance =B.Fault at 0.433 KV DB : 910-SW3-001a)Source :Fault MVA of source =300MVA(= VS X IFS X 1.732)Source Impedance (Zs) =0.333PU(= Base MVA /Fault MVA)XS=j0.333, 90 b)Transformer:Transformer rating =1MVATransformer secondary No-load voltage =0.433KVImpedance of Transformer T1 , at 0.433kV (Trafo No-load Voltage) =0.05p.uNow, trafo impedance at Base MVA & 0.415 kV Bus Voltage == [ p.u. Trafo Impedance x [ (Trafo No-load Voltage/ Bus Voltage) ] x [ (Base MVA / Trafo MVA) ]= 0.05 x (0.433/0.415) x (100 /1)XTR=j5.443, 90 d)Cable10.433kVCable to 910-SW3-001 SWITCHBOARDSize : 1Cx 630 mmR = ( 0.035 x 22) / (2 x 1000) =0.0004X = ( 0.084 x 22) / (2 x 1000) =0.0009Rpu = R x (Base MVA/(Base kV) )=0.205Xpu = X x (Base MVA/(Base kV) )=0.493ZC1=0.205+0.53467.38, j0.49320.433kV Cable to 910-JP-DB-001Size : 4Cx 120 mmR = ( 0.156 x 605) / (1 x 1000) =0.094X = ( 0.072 x605) / (1 x 1000) =0.044Rpu = R x (Base MVA/(Base kV) )=50.339Xpu = X x (Base MVA/(Base kV) )=23.233ZC2=50.339+55.44224.78, j23.23330.433kV Cable to FS-DB-001 (FIRE STATION)Size : 4Cx 35mmR = ( 0.525 x 372) / (1 x 1000) =0.195X = ( 0.079 x372) / (1 x 1000) =0.029Rpu = R x (Base MVA/(Base kV) )=104.166Xpu = X x (Base MVA/(Base kV) )=15.675ZC2=104.166+105.3398.56, j15.67540.433kV Cable to WS-DB-001 (WORK SHOP)Size : 4Cx 70mmR = ( 0.269 x 372) / (1 x 1000) =0.100X = ( 0.074 x372) / (1 x 1000) =0.028Rpu = R x (Base MVA/(Base kV) )=53.373Xpu = X x (Base MVA/(Base kV) )=14.682ZC2=53.373+55.35515.38, j14.68250.433kV Cable to ADM-SSB-001 (ADMN BLDG & CONTROL ROOM)Size : 4Cx 150mmR = ( 0.128 x 341) / (2 x 1000) =0.022X = ( 0.072 x341) / (2 x 1000) =0.012Rpu = R x (Base MVA/(Base kV) )=11.640Xpu = X x (Base MVA/(Base kV) )=6.548ZC2=11.640+13.35529.36, j6.54860.433kV Cable to RC-DB-001 (REFUSE CHAMBER)Size : 4Cx 25mmR = ( 0.727 x 372) / (1 x 1000) =0.270X = ( 0.081 x372) / (1 x 1000) =0.030Rpu = R x (Base MVA/(Base kV) )=144.245Xpu = X x (Base MVA/(Base kV) )=16.071ZC2=144.245+145.1386.36, j16.07170.433kV Cable to PS-DB-001 (PUMP SHED)Size : 4Cx 35mmR = ( 0.525 x 540) / (1 x 1000) =0.284X = ( 0.079 x540) / (1 x 1000) =0.043Rpu = R x (Base MVA/(Base kV) )=151.209Xpu = X x (Base MVA/(Base kV) )=22.753ZC2=151.209+152.9118.56, j22.75380.433kV Cable to LAB-DB-002 (LABORATORY/SAMPLE ROOM)Size : 4Cx 35mmR = ( 0.525 x 372) / (1 x 1000) =0.195X = ( 0.079 x372) / (1 x 1000) =0.029Rpu = R x (Base MVA/(Base kV) )=104.166Xpu = X x (Base MVA/(Base kV) )=15.675ZC2=104.166+105.3398.56, j15.67590.433kV Cable to FS-DB-002(FIRE STATION)Size : 4Cx 35mmR = ( 0.669 x 372) / (1 x 1000) =0.195X = ( 0.0743 x372) / (1 x 1000) =0.029Rpu = R x (Base MVA/(Base kV) )=104.166Xpu = X x (Base MVA/(Base kV) )=15.675ZC2=104.166+105.3398.56, j15.675100.433kV Cable to ADM-ESSB-001(ADM BLDG & CONTROL ROOM)Size : 4Cx 50mmR = ( 0.388 x 372) / (1 x 1000) =0.144X = ( 0.075 x372) / (1 x 1000) =0.028Rpu = R x (Base MVA/(Base kV) )=76.984Xpu = X x (Base MVA/(Base kV) )=14.881ZC2=76.984+78.40910.94, j14.881110.433kV Cable to 114-FP-01-SL(OUTDOOR LIGHTING)Size : 4Cx 50mmR = ( 0.388 x 500) / (1 x 1000) =0.194X = ( 0.075 x500) / (1 x 1000) =0.038Rpu = R x (Base MVA/(Base kV) )=103.473Xpu = X x (Base MVA/(Base kV) )=20.001ZC2=103.473+105.38810.94, j20.001120.433kV Cable to LCP-940-02A/B(SERVICE WATER PUMP)Size : 4Cx 50mmR = ( 0.388 x 708) / (1 x 1000) =0.275X = ( 0.075 x708) / (1 x 1000) =0.053Rpu = R x (Base MVA/(Base kV) )=146.517Xpu = X x (Base MVA/(Base kV) )=28.322ZC2=146.517+149.23010.94, j28.322130.433kV Cable to LCP-941-01A/B(FRESH WATER PUMP)Size : 4Cx 50mmR = ( 0.388 x 708) / (1 x 1000) =0.275X = ( 0.075 x708) / (1 x 1000) =0.053Rpu = R x (Base MVA/(Base kV) )=146.517Xpu = X x (Base MVA/(Base kV) )=28.322ZC2=146.517+149.23010.94, j28.322140.433kV Cable to 910-DB-001(33KV CONSUMER SS)Size : 4Cx35mmR = ( 0.525 x 54) / (1 x 1000) =0.028X = ( 0.079 x54) / (1 x 1000) =0.004Rpu = R x (Base MVA/(Base kV) )=15.121Xpu = X x (Base MVA/(Base kV) )=2.275ZC2=15.121+15.2918.56, j2.275150.433kV Cable to LAB-DB-001(LABORATORY/SAMPLE ROOM)Size : 4Cx 35mmR = ( 0.525 x 372) / (1 x 1000) =0.195X = ( 0.079 x372) / (1 x 1000) =0.029Rpu = R x (Base MVA/(Base kV) )=104.166Xpu = X x (Base MVA/(Base kV) )=15.675ZC2=104.166+105.3398.56, j15.675160.433kV Cable to AC-CS-SR-01(AIR COND PANEL)Size : 4Cx 35mmR = ( 0.525 x 20) / (1 x 1000) =0.011X = ( 0.079 x20) / (1 x 1000) =0.002Rpu = R x (Base MVA/(Base kV) )=5.600Xpu = X x (Base MVA/(Base kV) )=0.843ZC2=5.600+5.6638.56, j0.843170.433kV Cable to AC-CS-SGR-01(AIR COND PANEL)Size : 4Cx 25mmR = ( 0.727 x 24) / (1 x 1000) =0.039X = ( 0.081 x24) / (1 x 1000) =0.004Rpu = R x (Base MVA/(Base kV) )=20.939Xpu = X x (Base MVA/(Base kV) )=2.333ZC2=20.939+21.0686.36, j2.333180.433kV Cable to 910-UPS-001(AC UPS)Size : 4Cx 25mmR = ( 0.727 x 54) / (1 x 1000) =0.039X = ( 0.081 x54) / (1 x 1000) =0.004Rpu = R x (Base MVA/(Base kV) )=20.939Xpu = X x (Base MVA/(Base kV) )=2.333ZC2=20.939+21.0686.36, j2.333190.433kV Cable to 910-UPS-001(AC UPS BYPASS)Size : 4Cx 25mmR = ( 0.727 x 54) / (1 x 1000) =0.039X = ( 0.081 x54) / (1 x 1000) =0.004Rpu = R x (Base MVA/(Base kV) )=20.939Xpu = X x (Base MVA/(Base kV) )=2.333ZC2=20.939+21.0686.36, j2.333200.433kV Cable to 910-UPS-002(DC UPS )Size : 4Cx 16mmR = ( 1.15 x 54) / (1 x 1000) =0.062X = ( 0.081 x54) / (1 x 1000) =0.029Rpu = R x (Base MVA/(Base kV) )=33.122Xpu = X x (Base MVA/(Base kV) )=15.675ZC2=33.122+36.64425.33, j15.675210.433kV Cable to 910-UPS-003(DC UPS )Size : 4Cx 16mmR = ( 1.15 x 54) / (1 x 1000) =0.062X = ( 0.081 x54) / (1 x 1000) =0.004Rpu = R x (Base MVA/(Base kV) )=33.122Xpu = X x (Base MVA/(Base kV) )=2.333ZC2=33.122+33.2044.03, j2.333220.433kV Cable to ADM-UPS-001(AC UPS)Size : 4Cx 35mmR = ( 0.525 x 372) / (1 x 1000) =0.195X = ( 0.079 x372) / (1 x 1000) =0.029Rpu = R x (Base MVA/(Base kV) )=104.166Xpu = X x (Base MVA/(Base kV) )=15.675ZC2=104.166+105.3398.56, j15.675230.433kV Cable to ADM-UPS-001(AC UPS BYPASS)Size : 4Cx 35mmR = ( 0.525 x 372) / (1 x 1000) =0.195X = ( 0.079 x372) / (1 x 1000) =0.029Rpu = R x (Base MVA/(Base kV) )=104.166Xpu = X x (Base MVA/(Base kV) )=15.675ZC2=104.166+105.3398.56, j15.675240.433kV Cable to 910-DB-002(33KV CONSUMER SS)Size : 4Cx 25mmR = ( 0.727 x 54) / (1 x 1000) =0.039X = ( 0.081 x54) / (1 x 1000) =0.004Rpu = R x (Base MVA/(Base kV) )=20.939Xpu = X x (Base MVA/(Base kV) )=2.333ZC2=20.939+21.0686.36, j2.333250.433kV Cable to LAB-DB-003(LABORATORY/SAMPLE ROOM)Size : 4Cx35mmR = ( 0.525 x 372) / (1 x 1000) =0.195X = ( 0.079 x372) / (1 x 1000) =0.029Rpu = R x (Base MVA/(Base kV) )=104.166Xpu = X x (Base MVA/(Base kV) )=15.675ZC2=104.166+105.3398.56, j15.675260.433kV Cable to 910-FP-01-SL(OUTDOOR LIGHTING)Size : 4Cx25mmR = ( 0.727 x 96) / (1 x 1000) =0.070X = ( 0.081 x96) / (1 x 1000) =0.018Rpu = R x (Base MVA/(Base kV) )=37.225Xpu = X x (Base MVA/(Base kV) )=9.578ZC2=37.225+38.43714.43, j9.578270.433kV Cable to TNB-DB-001(TNB SUBSTATION)Size : 4Cx50mmR = ( 0.388 x 144) / (1 x 1000) =0.056X = ( 0.075 x144) / (1 x 1000) =0.011Rpu = R x (Base MVA/(Base kV) )=29.800Xpu = X x (Base MVA/(Base kV) )=5.760ZC2=29.800+30.35210.94, j5.760280.433kV Cable to WH-DB-001(WARE HOUSE)Size : 4Cx50mmR = ( 0.388 x 368) / (1 x 1000) =0.143X = ( 0.075 x368) / (1 x 1000) =0.028Rpu = R x (Base MVA/(Base kV) )=76.156Xpu = X x (Base MVA/(Base kV) )=14.721ZC2=76.156+77.56610.94, j14.721Z1=ZS+ZTR+ZC1ZS=j0.333ZTR=j5.443ZC1=0.2053+j0.4928Z1=ZS+ZTR+ZC1=0.2053j6.2692Z1MAG=6.272688.121/Z1MAG=0.1594-88.121/Z1REAL=0.00521/Z1REAC=-0.15931/Z1=0.0052j-0.1593Z2ZC2=50.34+j23.23Z2MAG=55.441924.781/Z2MAG=0.0180-24.781/Z2REAL=0.01641/Z2REAC=-0.00761/Z2=0.0164j-0.0076Z3ZC3=104.17+j15.67Z3MAG=105.348.561/Z3MAG=0.0095-8.561/Z3REAL=0.00941/Z3REAC=-0.00141/Z3=0.0094j-0.0014Z4ZC4=53.37+j14.68Z4MAG=55.3615.381/Z4MAG=0.0181-15.381/Z4REAL=0.01741/Z4REAC=-0.00481/Z4=0.0174j-0.0048Z5ZC5=11.64+j6.55Z5MAG=13.3629.361/Z5MAG=0.0749-29.361/Z5REAL=0.06531/Z5REAC=-0.03671/Z5=0.0653j-0.0367Z6ZC6=144.25+j16.07Z6MAG=145.146.361/Z6MAG=0.0069-6.361/Z6REAL=0.00681/Z6REAC=-0.00081/Z6=0.0068j-0.0008Z7ZC7=151.21+j22.75Z7MAG=152.918.561/Z7MAG=0.0065-8.561/Z7REAL=0.00651/Z7REAC=-0.00101/Z7=0.0065j-0.0010Z8ZC8=104.17+j15.67Z8MAG=105.348.561/Z8MAG=0.0095-8.561/Z8REAL=0.00941/Z8REAC=-0.00141/Z8=0.0094j-0.0014Z9ZC9=104.17+j15.67Z9MAG=105.348.561/Z9MAG=0.0095-8.561/Z9REAL=0.00941/Z9REAC=-0.00141/Z9=0.0094j-0.0014Z10ZC10=76.98+j14.88Z10MAG=78.4110.941/Z10MAG=0.0128-10.941/Z10REAL=0.01251/Z10REAC=-0.00241/Z10=0.0125j-0.0024Z11ZC11=103.47+j20.00Z11MAG=105.3910.941/Z11MAG=0.0095-10.941/Z11REAL=0.00931/Z11REAC=-0.00181/Z11=0.0093j-0.0018Z12ZC12=146.52+j28.32Z12MAG=149.2310.941/Z12MAG=0.0067-10.941/Z12REAL=0.00661/Z12REAC=-0.00131/Z12=0.0066j-0.0013Z13ZC13=146.52+j28.32Z13MAG=149.2310.941/Z13MAG=0.0067-10.941/Z13REAL=0.00661/Z13REAC=-0.00131/Z13=0.0066j-0.0013Z14ZC14=15.12+j2.28Z14MAG=15.298.561/Z14MAG=0.0654-8.561/Z14REAL=0.06471/Z14REAC=-0.00971/Z14=0.0647j-0.0097Z15ZC15=104.17+j15.67Z15MAG=105.348.561/Z15MAG=0.0095-8.561/Z15REAL=0.00941/Z15REAC=-0.00141/Z15=0.0094j-0.0014Z16ZC16=5.6+j0.84Z16MAG=5.66348.561/Z16MAG=0.1766-8.561/Z16REAL=0.17461/Z16REAC=-0.02631/Z16=0.1746j-0.0263Z17ZC17=20.94+j2.33Z17MAG=21.076.361/Z17MAG=0.0475-6.361/Z17REAL=0.04721/Z17REAC=-0.00531/Z17=0.0472j-0.0053Z18ZC18=20.94+j2.33Z18MAG=21.076.361/Z18MAG=0.0475-6.361/Z18REAL=0.04721/Z18REAC=-0.00531/Z18=0.0472j-0.0053Z19ZC19=20.94+j2.33Z19MAG=21.076.361/Z19MAG=0.0475-6.361/Z19REAL=0.04721/Z19REAC=-0.00531/Z19=0.0472j-0.0053Z20ZC20=33.12+j15.67Z20MAG=36.6425.331/Z20MAG=0.0273-25.331/Z20REAL=0.02471/Z20REAC=-0.01171/Z20=0.0247j-0.0117Z21ZC21=33.12+j2.33Z21MAG=33.204.031/Z21MAG=0.0301-4.031/Z21REAL=0.03001/Z21REAC=-0.00211/Z21=0.0300j-0.0021Z22ZC22=104.17+j15.67Z22MAG=105.348.561/Z22MAG=0.0095-8.561/Z22REAL=0.00941/Z22REAC=-0.00141/Z22=0.0094j-0.0014Z23ZC23=104.17+j15.67Z23MAG=105.348.561/Z23MAG=0.0095-8.561/Z23REAL=0.00941/Z23REAC=-0.00141/Z23=0.0094j-0.0014Z24ZC24=20.94+j2.33Z24MAG=21.076.361/Z24MAG=0.0475-6.361/Z24REAL=0.04721/Z24REAC=-0.00531/Z24=0.0472j-0.0053Z25ZC25=104.17+j15.67Z25MAG=105.348.561/Z25MAG=0.0095-8.561/Z25REAL=0.00941/Z25REAC=-0.00141/Z25=0.0094j-0.0014Z26ZC26=37.22+j9.58Z26MAG=38.4414.431/Z26MAG=0.0260-14.431/Z26REAL=0.02521/Z26REAC=-0.00651/Z26=0.0252j-0.0065Z27ZC27=29.80+j5.76Z27MAG=30.3510.941/Z27MAG=0.0329-10.941/Z27REAL=0.03231/Z27REAC=-0.00631/Z27=0.0323j-0.0063Z28ZC28=76.16+j14.72Z28MAG=77.5710.941/Z28MAG=0.0129-10.941/Z28REAL=0.01271/Z28REAC=-0.00241/Z28=0.0127j-0.00241/ZEQ=0.7712j-0.31281/ZEQ MAG =0.8322ZEQ MAG =1.2016Therefore, Maximum Fault level at F1 =Base MVAZeq=83.2MVAMaximum Fault level at F1 in KA=115.78KA

&CSheet &P of &N6.6kV Switchboard :

Main Consumer SS (1)1OBJECTIVEThe purpose of this document is to find the maximum Fault Level attained during a 3 phase Symmetrical fault, on different Buses. In order to arrive at a more correct value, contribution of the Motors towards the fault ratings will also be considered.2REFERENCE DOCUMENTDocumentsDoc. No.a)Overall Plant Electrical Key Single Line Diagram ( 33kV System)b)Electrical Key Single Line Diagramc)Electrical Design BasisDH0008-ENG-E-DB-0001d)Load ListDH0008-ENG-E-DC-0001e)Specification for Transformer (Including Calculations)DH0008-BE-E-SP-00063NOTESa)Base Voltage is 0.433kV and Base MVA is 100MVA throughout the system.b)The impedance of busbars , circuit breakers , current transformers etc. which are negligibly small are not considered in this calculation.c)Sub-transient reactance of low voltage Induction motor is considered to be 17%.d)The short circuit current at the primary terminals (33kV) of the Transformers is 5.25KA as per 33KV fault current document.4BASIC DESIGN DATAa.System Data:Source Voltage (Vs)=33kVSource Fault Current (IFS)=5.25kAb.Source Transformer (T1) Data ( 910-TR-001):Primary Voltage=33kVSecondary Voltage=0.433kVTransformer capacity=1MVATransformer Impedance=5%c.Cable data for Transformer1Cable between (910-TR-001) Transformer and 0.433KV Switchboard (910-SW3-001) Located in Main Consumer Substation.Cable Size & type=1CX630 mm2,Cu,XLPE InsulatedNo. of Cable Runs=2Voltage=0.415KVCable length=22MetersCable Resistance=0.035/Km, at 90CCable Reactance=0.084/Km, at 90Cd.Cable Data for DB :1Cable Between 910-SW3-001 Board and 910-JP-DB-001(FIRE JOCKEY PUMP) DBCable Size & type=4C x 120 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.415kVCable length=605MetersCable Resistance=0.156/Km, at 90CCable Reactance=0.072/Km, at 90C2Cable Between 910-SW3-001 Board and FS-DB-001(FIRE STATION) DBCable Size & type=4C x 35 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.415kVCable length=372MetersCable Resistance=0.525/Km, at 90CCable Reactance=0.079/Km, at 90C3Cable Between 910-SW3-001 Board and WS-DB-001(WORKSHOP) DBCable Size & type=4C x70 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.415kVCable length=372MetersCable Resistance=0.269/Km, at 90CCable Reactance=0.074/Km, at 90C4Cable Between 910-SW3-001 Board and ADM-SSB-001(ADMN BLDG &CONTROL ROOM) DBCable Size & type=4C x150 mm2, XLPE insulatedNo. of Cable Runs=2Voltage=0.415kVCable length=341MetersCable Resistance=0.128/Km, at 90CCable Reactance=0.072/Km, at 90C5Cable Between 910-SW3-001 Board and RC-DB-001(REFUSE CHAMBER) DBCable Size & type=4C x25 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.415kVCable length=372MetersCable Resistance=0.727/Km, at 90CCable Reactance=0.081/Km, at 90C6Cable Between 910-SW3-001 Board and PS-DB-001(PUMP SHED) DBCable Size & type=4C x35 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.415kVCable length=540MetersCable Resistance=0.525/Km, at 90CCable Reactance=0.079/Km, at 90C7Cable Between 910-SW3-001 Board and LAB-DB-002 DBCable Size & type=4C x35 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.415kVCable length=372MetersCable Resistance=0.525/Km, at 90CCable Reactance=0.079/Km, at 90C8Cable Between 910-SW3-001 Board and FS-DB-002 (FIRE STATION) DBCable Size & type=4C x35 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.415kVCable length=372MetersCable Resistance=0.525/Km, at 90CCable Reactance=0.079/Km, at 90C9Cable Between 910-SW3-001 Board and ADM-ESSB-001(ADMN BLDG & CONTROL ROOM) DBCable Size & type=4C x50 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.415kVCable length=372MetersCable Resistance=0.388/Km, at 90CCable Reactance=0.075/Km, at 90C10Cable Between 910-SW3-001 Board and LCP-940-02A/B(SERVICE WATER PUMP) DBCable Size & type=4C x50 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.415kVCable length=708MetersCable Resistance=0.388/Km, at 90CCable Reactance=0.075/Km, at 90C11Cable Between 910-SW3-001 Board and LCP-941-01A/B(FRESHWATER PUMP) DBCable Size & type=4C x50 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.415kVCable length=708MetersCable Resistance=0.388/Km, at 90CCable Reactance=0.075/Km, at 90C12Cable Between 910-SW3-001 Board and 910-DB-001(33KV CONSUMER SS) DBCable Size & type=4C x35 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.415kVCable length=54MetersCable Resistance=0.525/Km, at 90CCable Reactance=0.079/Km, at 90C13Cable Between 910-SW3-001 Board and LAB-DB-001(LABORATORY/SAMPLE ROOM) DBCable Size & type=4C x35 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.415kVCable length=372MetersCable Resistance=0.525/Km, at 90CCable Reactance=0.079/Km, at 90C14Cable Between 910-SW3-001 Board and AC-CS-SR-01(AIR COND PANEL ) DBCable Size & type=4C x35 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.415kVCable length=20MetersCable Resistance=0.525/Km, at 90CCable Reactance=0.079/Km, at 90C15Cable Between 910-SW3-001 Board and AC-CS-SGR-01(AIR COND PANEL ) DBCable Size & type=4C x25 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.415kVCable length=24MetersCable Resistance=0.727/Km, at 90CCable Reactance=0.081/Km, at 90C16Cable Between 910-SW3-001 Board and 910-DB-002(33KV CONSUMER SS) DBCable Size & type=4C x25 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.415kVCable length=54MetersCable Resistance=0.727/Km, at 90CCable Reactance=0.081/Km, at 90C17Cable Between 910-SW3-001 Board and LAB-DB-003(LABORATORY/SAMPLE ROOM) DBCable Size & type=4C x35 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.415kVCable length=372MetersCable Resistance=0.525/Km, at 90CCable Reactance=0.079/Km, at 90C18Cable Between 910-SW3-001 Board and TNB-DB-001(TNB SUBSTATION) DBCable Size & type=4C x50 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.415kVCable length=144MetersCable Resistance=0.388/Km, at 90CCable Reactance=0.075/Km, at 90C19Cable Between 910-SW3-001 Board and WH-DB-001(WARE HOUSE) DBCable Size & type=4C x50 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.415kVCable length=368MetersCable Resistance=0.388/Km, at 90CCable Reactance=0.075/Km, at 90C7CALCULATIONA.GENERALa)Basic equation for short circuit calculation is =&WhereBase MVA =100MVABase Voltage =0.433kVZpu =Fault impedance per unitIs =Symmetrical short circuit current (kA)Fault MVA of source =VS X IFS X 1.732b)Machine Impedances are converted to 100MVA base per unit using the following equation :Per unit impedance =B.Fault at 0.433 KV DB : 910-SW3-001a)Source :Fault MVA of source =300MVA(= VS X IFS X 1.732)Source Impedance (Zs) =0.333PU(= Base MVA /Fault MVA)XS=j0.333, 90 b)Transformer:Transformer rating =1MVATransformer secondary No-load voltage =0.433KVImpedance of Transformer T1 , at 0.433kV (Trafo No-load Voltage) =0.05p.uNow, trafo impedance at Base MVA & 0.415 kV Bus Voltage == [ p.u. Trafo Impedance x [ (Trafo No-load Voltage/ Bus Voltage) ] x [ (Base MVA / Trafo MVA) ]= 0.05 x (0.433/0.415) x (100 /1)XTR=j5.443, 90 d)Cable10.433kVCable to 910-SW3-001 SWITCHBOARDSize : 1Cx 630 mmR = ( 0.035 x 22) / (2 x 1000) =0.0004X = ( 0.084 x 22) / (2 x 1000) =0.0009Rpu = R x (Base MVA/(Base kV) )=0.205Xpu = X x (Base MVA/(Base kV) )=0.493ZC1=0.205+0.53467.38, j0.49320.433kV Cable to 910-JP-DB-001Size : 4Cx 120 mmR = ( 0.156 x 605) / (1 x 1000) =0.094X = ( 0.072 x605) / (1 x 1000) =0.044Rpu = R x (Base MVA/(Base kV) )=50.339Xpu = X x (Base MVA/(Base kV) )=23.233ZC2=50.339+55.44224.78, j23.23330.433kV Cable to FS-DB-001 (FIRE STATION)Size : 4Cx 35mmR = ( 0.525 x 372) / (1 x 1000) =0.195X = ( 0.079 x372) / (1 x 1000) =0.029Rpu = R x (Base MVA/(Base kV) )=104.166Xpu = X x (Base MVA/(Base kV) )=15.675ZC2=104.166+105.3398.56, j15.67540.433kV Cable to WS-DB-001 (WORK SHOP)Size : 4Cx 70mmR = ( 0.269 x 372) / (1 x 1000) =0.100X = ( 0.074 x372) / (1 x 1000) =0.028Rpu = R x (Base MVA/(Base kV) )=53.373Xpu = X x (Base MVA/(Base kV) )=14.682ZC2=53.373+55.35515.38, j14.68250.433kV Cable to ADM-SSB-001 (ADMN BLDG & CONTROL ROOM)Size : 4Cx 150mmR = ( 0.128 x 341) / (2 x 1000) =0.022X = ( 0.072 x341) / (2 x 1000) =0.012Rpu = R x (Base MVA/(Base kV) )=11.640Xpu = X x (Base MVA/(Base kV) )=6.548ZC2=11.640+13.35529.36, j6.54860.433kV Cable to RC-DB-001 (REFUSE CHAMBER)Size : 4Cx 25mmR = ( 0.727 x 372) / (1 x 1000) =0.270X = ( 0.081 x372) / (1 x 1000) =0.030Rpu = R x (Base MVA/(Base kV) )=144.245Xpu = X x (Base MVA/(Base kV) )=16.071ZC2=144.245+145.1386.36, j16.07170.433kV Cable to PS-DB-001 (PUMP SHED)Size : 4Cx 35mmR = ( 0.525 x 540) / (1 x 1000) =0.284X = ( 0.079 x540) / (1 x 1000) =0.043Rpu = R x (Base MVA/(Base kV) )=151.209Xpu = X x (Base MVA/(Base kV) )=22.753ZC2=151.209+152.9118.56, j22.75380.433kV Cable to LAB-DB-002 (LABORATORY/SAMPLE ROOM)Size : 4Cx 35mmR = ( 0.525 x 372) / (1 x 1000) =0.195X = ( 0.079 x372) / (1 x 1000) =0.029Rpu = R x (Base MVA/(Base kV) )=104.166Xpu = X x (Base MVA/(Base kV) )=15.675ZC2=104.166+105.3398.56, j15.67590.433kV Cable to FS-DB-002(FIRE STATION)Size : 4Cx 35mmR = ( 0.669 x 372) / (1 x 1000) =0.195X = ( 0.0743 x372) / (1 x 1000) =0.029Rpu = R x (Base MVA/(Base kV) )=104.166Xpu = X x (Base MVA/(Base kV) )=15.675ZC2=104.166+105.3398.56, j15.675100.433kV Cable to ADM-ESSB-001(ADM BLDG & CONTROL ROOM)Size : 4Cx 50mmR = ( 0.388 x 372) / (1 x 1000) =0.144X = ( 0.075 x372) / (1 x 1000) =0.028Rpu = R x (Base MVA/(Base kV) )=76.984Xpu = X x (Base MVA/(Base kV) )=14.881ZC2=76.984+78.40910.94, j14.881110.433kV Cable to LCP-940-02A/B(SERVICE WATER PUMP)Size : 4Cx 50mmR = ( 0.388 x 708) / (1 x 1000) =0.275X = ( 0.075 x708) / (1 x 1000) =0.053Rpu = R x (Base MVA/(Base kV) )=146.517Xpu = X x (Base MVA/(Base kV) )=28.322ZC2=146.517+149.23010.94, j28.322120.433kV Cable to LCP-941-01A/B(FRESH WATER PUMP)Size : 4Cx 50mmR = ( 0.388 x 708) / (1 x 1000) =0.275X = ( 0.075 x708) / (1 x 1000) =0.053Rpu = R x (Base MVA/(Base kV) )=146.517Xpu = X x (Base MVA/(Base kV) )=28.322ZC2=146.517+149.23010.94, j28.322130.433kV Cable to 910-DB-001(33KV CONSUMER SS)Size : 4Cx35mmR = ( 0.525 x 54) / (1 x 1000) =0.028X = ( 0.079 x54) / (1 x 1000) =0.004Rpu = R x (Base MVA/(Base kV) )=15.121Xpu = X x (Base MVA/(Base kV) )=2.275ZC2=15.121+15.2918.56, j2.275140.433kV Cable to LAB-DB-001(LABORATORY/SAMPLE ROOM)Size : 4Cx 35mmR = ( 0.525 x 372) / (1 x 1000) =0.195X = ( 0.079 x372) / (1 x 1000) =0.029Rpu = R x (Base MVA/(Base kV) )=104.166Xpu = X x (Base MVA/(Base kV) )=15.675ZC2=104.166+105.3398.56, j15.675150.433kV Cable to AC-CS-SR-01(AIR COND PANEL)Size : 4Cx 35mmR = ( 0.525 x 20) / (1 x 1000) =0.011X = ( 0.079 x20) / (1 x 1000) =0.002Rpu = R x (Base MVA/(Base kV) )=5.600Xpu = X x (Base MVA/(Base kV) )=0.843ZC2=5.600+5.6638.56, j0.843160.433kV Cable to AC-CS-SGR-01(AIR COND PANEL)Size : 4Cx 25mmR = ( 0.727 x 24) / (1 x 1000) =0.017X = ( 0.081 x24) / (1 x 1000) =0.002Rpu = R x (Base MVA/(Base kV) )=9.306Xpu = X x (Base MVA/(Base kV) )=1.037ZC2=9.306+9.3646.36, j1.037170.433kV Cable to 910-DB-002(33KV CONSUMER SS)Size : 4Cx 25mmR = ( 0.727 x 54) / (1 x 1000) =0.039X = ( 0.081 x54) / (1 x 1000) =0.004Rpu = R x (Base MVA/(Base kV) )=20.939Xpu = X x (Base MVA/(Base kV) )=2.333ZC2=20.939+21.0686.36, j2.333180.433kV Cable to LAB-DB-003(LABORATORY/SAMPLE ROOM)Size : 4Cx35mmR = ( 0.525 x 372) / (1 x 1000) =0.195X = ( 0.079 x372) / (1 x 1000) =0.029Rpu = R x (Base MVA/(Base kV) )=104.166Xpu = X x (Base MVA/(Base kV) )=15.675ZC2=104.166+105.3398.56, j15.675190.433kV Cable to TNB-DB-001(TNB SUBSTATION)Size : 4Cx50mmR = ( 0.388 x 144) / (1 x 1000) =0.056X = ( 0.075 x144) / (1 x 1000) =0.011Rpu = R x (Base MVA/(Base kV) )=29.800Xpu = X x (Base MVA/(Base kV) )=5.760ZC2=29.800+30.35210.94, j5.760200.433kV Cable to WH-DB-001(WARE HOUSE)Size : 4Cx50mmR = ( 0.388 x 368) / (1 x 1000) =0.143X = ( 0.075 x368) / (1 x 1000) =0.028Rpu = R x (Base MVA/(Base kV) )=76.156Xpu = X x (Base MVA/(Base kV) )=14.721ZC2=76.156+77.56610.94, j14.721Z1=ZS+ZTR+ZC1ZS=j0.333ZTR=j5.443ZC1=0.2053+j0.4928Z1=ZS+ZTR+ZC1=0.2053j6.2692Z1MAG=6.272688.121/Z1MAG=0.1594-88.121/Z1REAL=0.00521/Z1REAC=-0.15931/Z1=0.0052j-0.1593Z2ZC2=50.34+j23.23Z2MAG=55.441924.781/Z2MAG=0.0180-24.781/Z2REAL=0.01641/Z2REAC=-0.00761/Z2=0.0164j-0.0076Z3ZC3=104.17+j15.67Z3MAG=105.348.561/Z3MAG=0.0095-8.561/Z3REAL=0.00941/Z3REAC=-0.00141/Z3=0.0094j-0.0014Z4ZC4=53.37+j14.68Z4MAG=55.3615.381/Z4MAG=0.0181-15.381/Z4REAL=0.01741/Z4REAC=-0.00481/Z4=0.0174j-0.0048Z5ZC5=11.64+j6.55Z5MAG=13.3629.361/Z5MAG=0.0749-29.361/Z5REAL=0.06531/Z5REAC=-0.03671/Z5=0.0653j-0.0367Z6ZC6=144.25+j16.07Z6MAG=145.146.361/Z6MAG=0.0069-6.361/Z6REAL=0.00681/Z6REAC=-0.00081/Z6=0.0068j-0.0008Z7ZC7=151.21+j22.75Z7MAG=152.918.561/Z7MAG=0.0065-8.561/Z7REAL=0.00651/Z7REAC=-0.00101/Z7=0.0065j-0.0010Z8ZC8=104.17+j15.67Z8MAG=105.348.561/Z8MAG=0.0095-8.561/Z8REAL=0.00941/Z8REAC=-0.00141/Z8=0.0094j-0.0014Z9ZC9=104.17+j15.67Z9MAG=105.348.561/Z9MAG=0.0095-8.561/Z9REAL=0.00941/Z9REAC=-0.00141/Z9=0.0094j-0.0014Z10ZC10=76.98+j14.88Z10MAG=78.4110.941/Z10MAG=0.0128-10.941/Z10REAL=0.01251/Z10REAC=-0.00241/Z10=0.0125j-0.0024Z11ZC11=146.52+j28.32Z11MAG=149.2310.941/Z11MAG=0.0067-10.941/Z11REAL=0.00661/Z11REAC=-0.00131/Z11=0.0066j-0.0013Z12ZC12=146.52+j28.32Z12MAG=149.2310.941/Z12MAG=0.0067-10.941/Z12REAL=0.00661/Z12REAC=-0.00131/Z12=0.0066j-0.0013Z13ZC13=15.12+j2.28Z13MAG=15.298.561/Z13MAG=0.0654-8.561/Z13REAL=0.06471/Z13REAC=-0.00971/Z13=0.0647j-0.0097Z14ZC14=104.17+j15.67Z14MAG=105.348.561/Z14MAG=0.0095-8.561/Z14REAL=0.00941/Z14REAC=-0.00141/Z14=0.0094j-0.0014Z15ZC15=5.6+j0.84Z15MAG=5.66348.561/Z15MAG=0.1766-8.561/Z15REAL=0.17461/Z15REAC=-0.02631/Z15=0.1746j-0.0263Z16ZC16=9.31+j1.04Z16MAG=9.366.361/Z16MAG=0.1068-6.361/Z16REAL=0.10611/Z16REAC=-0.01181/Z16=0.1061j-0.0118Z17ZC17=20.94+j2.33Z17MAG=21.076.361/Z17MAG=0.0475-6.361/Z17REAL=0.04721/Z17REAC=-0.00531/Z17=0.0472j-0.0053Z18ZC18=104.17+j15.67Z18MAG=105.348.561/Z18MAG=0.0095-8.561/Z18REAL=0.00941/Z18REAC=-0.00141/Z18=0.0094j-0.0014Z19ZC19=29.80+j5.76Z19MAG=30.3510.941/Z19MAG=0.0329-10.941/Z19REAL=0.03231/Z19REAC=-0.00631/Z19=0.0323j-0.0063Z20ZC20=76.16+j14.72Z20MAG=77.5710.941/Z20MAG=0.0129-10.941/Z20REAL=0.01271/Z20REAC=-0.00241/Z20=0.0127j-0.00241/ZEQ=0.6278j-0.28391/ZEQ MAG =0.6890ZEQ MAG =1.4513Therefore, Maximum Fault level at F1 =Base MVAZeq=68.9MVAMaximum Fault level at F1 in KA=95.86KA

&CSheet &P of &N6.6kV Switchboard :

415_LPS301&3021OBJECTIVEThe purpose of this document is to find the maximum Fault Level attained during a 3 phase Symmetrical fault, on different Buses. In order to arrive at a more correct value, contribution of the Motors towards the fault ratings will also be considered.2REFERENCE DOCUMENTDocumentsDoc. No.a)Overall Plant Electrical Key Single Line Diagram ( 33kV System)b)Electrical Key Single Line Diagramc)Electrical Design BasisDH0008-ENG-E-DB-0001d)Load ListDH0008-ENG-E-DC-0001e)Specification for Transformer (Including Calculations)DH0008-BE-E-SP-00063NOTESa)Base Voltage is 0.433kV and Base MVA is 100MVA throughout the system.b)The impedance of busbars , circuit breakers , current transformers etc. which are negligibly small are not considered in this calculation.c)Sub-transient reactance of low voltage Induction motor is considered to be 17%.d)The short circuit current at the primary terminals (33kV) of the Transformers is 5.25KA for 3 sec as per 33KV fault current document.4BASIC DESIGN DATAa.System Data:Source Voltage (Vs)=33kVSource Fault Current (IFS)=5.25kAb.Source Transformer (T1) Data ( 911-TR-002):Primary Voltage=33kVSecondary Voltage=0.433kVTransformer capacity=2.5MVATransformer Impedance=6%c.Cable data for Transformer1Cable between (911-TR-002) Transformer and 0.433KV Switchboard (911-SW3-001) Located in LPS301.Cable Size & type=1CX630 mm2,Cu,XLPE InsulatedNo. of Cable Runs=5Voltage=0.433KVCable length=22MetersCable Resistance=0.035/Km, at 90CCable Reactance=0.084/Km, at 90Cd.Cable Data for DB :2Cable Between 911-SW3-001 Board and 415V LCS 301 (911-DB-001) DBCable Size & type=4C x 16 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.415kVCable length=54MetersCable Resistance=1.15/Km, at 90CCable Reactance=0.081/Km, at 90C3Cable Between 911-SW3-001 Board and (301-DB-001-MOV) DBCable Size & type=4C x 50 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.415kVCable length=180MetersCable Resistance=0.388/Km, at 90CCable Reactance=0.075/Km, at 90C4Cable Between 911-SW3-001 Board and (301-DB-002-MOV) DBCable Size & type=4C x 50 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.415kVCable length=228MetersCable Resistance=0.388/Km, at 90CCable Reactance=0.075/Km, at 90C5Cable Between 911-SW3-001 Board and (301-DB-003-MOV) DBCable Size & type=4C x 50 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.415kVCable length=252MetersCable Resistance=0.388/Km, at 90CCable Reactance=0.075/Km, at 90C6Cable Between 911-SW3-001 Board and (301-DB-004-MOV) DBCable Size & type=4C x 50 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.415kVCable length=276MetersCable Resistance=0.388/Km, at 90CCable Reactance=0.075/Km, at 90C7Cable Between 911-SW3-001 Board and (301-DB-005-MOV) DBCable Size & type=4C x 50 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.415kVCable length=294MetersCable Resistance=0.388/Km, at 90CCable Reactance=0.075/Km, at 90C8Cable Between 911-SW3-001 Board and (301-DB-006-MOV) DBCable Size & type=4C x 50 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.415kVCable length=96MetersCable Resistance=0.388/Km, at 90CCable Reactance=0.075/Km, at 90C9Cable Between 911-SW3-001 Board and (301-DB-007-MOV) DBCable Size & type=4C x 50 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.415kVCable length=120MetersCable Resistance=0.388/Km, at 90CCable Reactance=0.075/Km, at 90C10Cable Between 911-SW3-001 Board and (301-DB-008-MOV) DBCable Size & type=4C x 50 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.415kVCable length=168MetersCable Resistance=0.388/Km, at 90CCable Reactance=0.075/Km, at 90C11Cable Between 911-SW3-001 Board and (301-DB-009-MOV) DBCable Size & type=4C x 50 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.415kVCable length=168MetersCable Resistance=0.388/Km, at 90CCable Reactance=0.075/Km, at 90C12Cable Between 911-SW3-001 Board and (301-DB-010-MOV) DBCable Size & type=4C x 50 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.415kVCable length=168MetersCable Resistance=0.388/Km, at 90CCable Reactance=0.075/Km, at 90C13Cable Between 911-SW3-001 Board and 101-MCC-003-MIX(MIXER) DBCable Size & type=4C x 300 mm2, XLPE insulatedNo. of Cable Runs=2Voltage=0.415kVCable length=440MetersCable Resistance=0.066/Km, at 90CCable Reactance=0.07/Km, at 90C14Cable Between 911-SW3-001 Board and 101-MCC-007-MIX(MIXER) DBCable Size & type=4C x 150 mm2, XLPE insulatedNo. of Cable Runs=2Voltage=0.415kVCable length=440MetersCable Resistance=0.128/Km, at 90CCable Reactance=0.072/Km, at 90C15Cable Between 911-SW3-001 Board and 103-MCC-003-MIX(MIXER) DBCable Size & type=4C x 300 mm2, XLPE insulatedNo. of Cable Runs=2Voltage=0.415kVCable length=275MetersCable Resistance=0.066/Km, at 90CCable Reactance=0.07/Km, at 90C16Cable Between 911-SW3-001 Board and 103-MCC-007-MIX(MIXER) DBCable Size & type=4C x 70 mm2, XLPE insulatedNo. of Cable Runs=2Voltage=0.415kVCable length=300MetersCable Resistance=0.269/Km, at 90CCable Reactance=0.074/Km, at 90C17Cable Between 911-SW3-001 Board and ADDITIVE TRANSFER PUMP (P-920-01A) DBCable Size & type=3C x 25 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.415kVCable length=252MetersCable Resistance=0.728/Km, at 90CCable Reactance=0.081/Km, at 90C18Cable Between 911-SW3-001 Board and ADDITIVE TRANSFER PUMP (P-920-01B) DBCable Size & type=3C x 25 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.415kVCable length=252MetersCable Resistance=0.728/Km, at 90CCable Reactance=0.081/Km, at 90C19Cable Between 911-SW3-001 Board and 101-MCC-005-AUX (OILY WATER PUMP) DBCable Size & type=4C x 35 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.415kVCable length=440MetersCable Resistance=0.525/Km, at 90CCable Reactance=0.079/Km, at 90C20Cable Between 911-SW3-001 Board and 103-MCC-005-AUX (OILY WATER PUMP) DBCable Size & type=4C x 35 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.415kVCable length=306MetersCable Resistance=0.525/Km, at 90CCable Reactance=0.079/Km, at 90C21Cable Between 911-SW3-001 Board and P-301-10A (SUMP PUMP)Cable Size & type=3C x 25 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.415kVCable length=308MetersCable Resistance=0.728/Km, at 90CCable Reactance=0.081/Km, at 90C22Cable Between 911-SW3-001 Board and P-301-10B (SUMP PUMP)Cable Size & type=3C x 25 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.415kVCable length=308MetersCable Resistance=0.728/Km, at 90CCable Reactance=0.081/Km, at 90C23Cable Between 911-SW3-001 Board and P-301-11 (SLOP PUMP)Cable Size & type=3C x10 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.415kVCable length=308MetersCable Resistance=1.83/Km, at 90CCable Reactance=0.085/Km, at 90C24Cable Between 911-SW3-001 Board and 912-SW3-001 DBCable Size & type=4C x 400 mm2, XLPE insulatedNo. of Cable Runs=4Voltage=0.415kVCable length=253MetersCable Resistance=0.054/Km, at 90CCable Reactance=0.07/Km, at 90C25Cable Between 912-SW3-001 Board and 415V LCS 302 DB(912-DB-001) DBCable Size & type=4C x 16 mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.415kVCable length=54MetersCable Resistance=1.15/Km, at 90CCable Reactance=0.081/Km, at 90C26Cable Between 912-SW3-001 Board and ADDITIVE INJ 3&4(302-LCP-011-AI) DBCable Size & type=4C x 25mm2, XLPE insulatedNo. of Cable Runs=1Voltage=0.415kVCable length=252MetersCable Resistance=0.727/Km, at 90CCable Reactance=0.081/Km, at 90C27Cable Between 912-SW3-001 Board and MOV(302-D