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Lt Cable Sizing Design as Per15% Drop)

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Lt Cable Sizing Design as Per 15% Drop)
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  HZL-BTN-ELE-DS-SY-037 INPUT DATA Feeder LoadkW Voltage rating kVLength of the cable m AC resistance of the cable at 90°C  Ω  / kmReactance of the cable at 50Hz  Ω  / km Allowable Voltage Drop%Current derating factor  Calculation Full load current rating of the Feeder  Size of 300 Sq.mm 3.5 core Aluminium cable is selected for checking.(Ref : Power Engineers Handbook 25.66, Table 57)===Total factor to be applied for arriving at the capacity=current carrying capacity of 300sq.mm,3Run cable==A Check for voltage dropVoltage drop Where,(Assumed) With in the permissible limits of 5% voltage drop hence okShort Time rating of the Cable 1.94x PMCC TO MCC INCOMER 1.001.01P=4601.02V T %=0.4151.03L=501.04R=0.1291.05X=0.07051.06=51.07=0.65==2.002.01P=800A √ 3 x V  √ 3 x 0.415460 / 0.8IFL2.02Cable size Rating factor for Ambient Temperature 35°CCurrent Rating at 35°C3001.0455 AFactor for grouping of cables0.86Reduction Factor0.9Factor for Non leaner loads0.80.652.03455x3x0.658873.003.01 IFLV drop =x(R cos Φ  + X sin Φ )xLncos Φ =0.8sin Φ =0.650800V drop =3x((0.000129 x 0.8) + (0.0000705 x 0.6))VxV drop %V drop ==300=1.94100=0.8122.7=2403.02I w =s LT CABLE SIZING CALCULATION KA/0.2Sec13.2x √ t13.2* √ 13.03(ACB Operated) 3 runs of 1.1kV grade, 3.5C x300 sq.mm, Al conductor, Armoured, XLPE cable is selected 2 of 284  HZL-BTN-ELE-DS-SY-037 INPUT DATA Feeder LoadkWVoltage rating kVLength of the cable m AC resistance of the cable at 90°C  Ω  / kmReactance of the cable at 50Hz  Ω  / km Allowable Voltage Drop at Normal Running Cond.% Allowable Voltage Drop at Starting Condition%Current derating factors Calculation Full load current rating of the Feeder  Size of 95 Sq.mm 3.5core Aluminium cable is selected for checking.(Ref : Power Engineers Handbook 25.66, Table 57)===Total factor to be applied for arriving at the capacity=Current carrying capacity of 95 sq.mm1 Run Cable ==A Check for voltage dropVoltage drop Where,(Assumed) Voltage Drop at Normal Running ConditionWith in the Permissible limit of 2.5% voltage drop hence ok DOL or Squirrel Cage =A0.982402.335x100=Factor for grouping of cables0.86=14476.50.07240.6545=2.5221 A=0.9Factor for Non linear loads=2.335(R cos Φ  + X sin Φ )0.80.6xV%2.002.0176.5 / 0.8 IFL= PMCC TO Crusher Building EOT Crane 1.00=1.01P0.409V T =0.415=1.03L1.021.061.05X1.04R2.02Cable size Rating factor for Ambient Temperature 35°C √ 3 x V x η 0.95x √ 3 x 0.415=P ACurrent Rating at 35°C0.8nx951.0=140Reduction Factor IFLV drop =2.03221x1x0.65x3.003.01Lsin Φ =cos Φ =140V drop =1%V drop =V drop x45 Check for Starting Current 3.021.07=15840( 6 Times the full load current)1.08=0.65((0.000409 x 0.8) + (0.0000724 x 0.6))3 of 284  HZL-BTN-ELE-DS-SY-037 Drop at the time of Starting With in the Permissible limit of 15% voltage drop hence okShort Time rating of the CableINPUT DATA Feeder LoadkW Voltage rating kVLength of the cable m AC resistance of the cable at 90°C  Ω  / kmReactance of the cable at 50Hz  Ω  / km Allowable Voltage Drop at Normal running Cond.% Allowable Voltage Drop at Starting Condition%Current derating factors Calculation Full load current rating of the Feeder  Size of 300 Sq.mm 3.5core Aluminium cable is selected for checking.(Ref : Power Engineers Handbook 25.66, Table 57)===Total factor to be applied for arriving the capacity=Current carrying capacity of 300 sq.mm1 Run Cable ==A Check for voltage dropVoltage drop 14.01x100=x=5.848401((0.000409 x 0.8) + (0.0000724 x 0.6))V drop == It is to be noted that motor has been selected to start upto 80% of rated voltage %24013.2x √ t=0.650.0705242=15V T L=165=0.415x Ax296Factor for Non linear loads0.65(R cos Φ  + X sin Φ )1.01P1.062.002.011.023.031.031.051.08X1.071.04R16.11.00I w =s3.04 1 run of 1.1kV grade, 3.5C x95sq.mm, Al conductor, Armoured, XLPE cable is selected =9513.2* √ .2132 / 0.8 IFL=0.95x √ 3 x 0.415= √ 3 x V x η 2.02Cable size Rating factor for Ambient Temperature 35°CCurrent Rating at 35°C2.03455x1x0.653001.00.8455 AFactor for grouping of cables0.86Reduction Factor0.93.003.01 IFLV drop =nKA/0.2SecL=2.5=0.129=P PMCC TO Conveyor 01 x%V drop ==14.01V drop V132=(Fuse Operated)454 of 284  HZL-BTN-ELE-DS-SY-037Where,(Assumed) Voltage Drop at Normal Running ConditionWith in the Permissible limit of 2.5% voltage drop hence ok DOL or Squirrel Cage =A Drop at the time of Starting With in the Permissible limit of 15% voltage drop hence okShort Time rating of the CableINPUT DATA Feeder LoadkW Voltage rating kVLength of the cable m AC resistance of the cable at 90°C  Ω  / kmReactance of the cable at 50Hz  Ω  / km Allowable Voltage Drop at Normal running cond.% Allowable Voltage Drop at Starting Condition%Current derating factors Calculation Full load current rating of the Feeder  Size of 150 Sq.mm 3.5core Aluminium cable is selected for checking.5.81=14.53%240240x100==90((0.000129 x 0.8) + (0.0000705 x 0.6))0.26413.2* √ 1V T =0.4152.43%R=1.021.041.052.012.000.8x3.02=cos Φ =242V drop =1V drop %V drop 3.04 1 run of 1.1kV grade, 3.5C x300sq.mm, Al conductor, Armoured, XLPE cable is selected KA/SecI w =s=13.2x √ t30022.71.001.01P=1.03L=2700.0716X==0.65151.06=2.51.081.07=IFL=A0.95x √ 3 x 0.415P= √ 3 x V x η 165=90 / 0.8 sin Φ =xV drop =34.859V Check for Starting Current 1452( 6 Times the full load current)1452V drop 165((0.000129 x 0.8) + (0.0000705 x 0.6))x5.81=0.6V= PMCC TO Conveyor 02 %V drop =x134.859x100 It is to be noted that motor has been selected to start upto 80% of rated voltage 3.03(Fuse Operated)1655 of 284
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