Cable Voltage Drop & CB Calculations

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First: Cable Sizing Input Data system = 3 = 415 Power Factor ( P.F ) = 0.80 Rated Voltage ( Vn ) = 415 Ampient Temperature = 40 Max.conductor Temperature = 90 Route length of Cable ( L ) = 300 Load Power ( PL ) = 60,000 Rated Current ( I L ) = PL / ( √3 x Vn = 104 Cable selection 1 x ( 4 Core x 70 Cable Ampacity = Iz = 165 A INSTALLATION METHOD INSTALLATION DETAILS Multi-Core Cable No Adjacent Circuit Overhead Unburied Circuit Surface Mounted on Ceiling Calculation & formula Air Temperature factor = 0.91 Grouping Factor = 1.00 Rated current of Cable = 165 = 1.25 = 150 De-rated current of cable > 150 A > 130 A Second: Voltage Drop Calculations ( Uo ) No Load Voltage O.C F De- rated current of Cable = Air Temp. factor x Grouping Factor x Rated current of Cable Rated Current ( I L ) x O.C.F

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Transcript of Cable Voltage Drop & CB Calculations

Cable,VD and CB CalculationFirst: Cable SizingInput Datasystem=3phase( Uo ) No Load Voltage=415VPower Factor ( P.F )=0.80Rated Voltage ( Vn )=415VAmpient Temperature=40cMax.conductor Temperature=90cRoute length of Cable ( L )=300mLoad Power ( PL )=60,000WattRated Current ( I L ) = PL / ( 3 x Vn x PF )=104ACable selection is:1x (4 Corex70mm )Cable Ampacity =Iz=165A0.00INSTALLATION METHODINSTALLATION DETAILSMulti-Core CableNo Adjacent CircuitOverheadUnburied CircuitSurface Mounted on CeilingCalculation & formulaAir Temperature factor=0.91Grouping Factor=1.00Rated current of Cable=165AO.CF=1.25De- rated current of Cable = Air Temp. factor x Grouping Factor x Rated current of Cable=150ADe-rated current of cable>Rated Current ( I L ) x O.C.F150A>130A0.00Second: Voltage Drop CalculationsAC Resistance of Cable ( RAC )=0.321/Kminductance of Cable ( X )=0.08/KmP.F = cos()=0.80Sin ()=0.600( V D ) Voltage drop of cable ( L ) per Amp. Per legnth = 3 ( R (AC)90cos() + X sin() )=0.53V/Amp/Km(VD Cable) Voltage drop of cable ( L )=(V D x I L x L)=16.54V( V D% ) = (V D cable *100 / V n)=3.99%3.99%


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