Dinesh R
Cable Voltage Drop Manual Calculation with Etap Result
Figure 1:Etap Result
Input Data:
Grid:
Voltage Rating(kV)
= 11kV
Transformer:
Voltage Ratings(kV) = 11/0.415kV
Ratings (MVA)
= 2 MVA
Impedance (Z%)
= 6%
Dinesh R
Figure 2:Transformer inputs
Cable:
Cable Sq.mm
= 185mm
Length
= 100m
No of Run
=1
Conductor type
= Aluminium
Core
= 4/C
Total Derating factor= 0.93(Values are taken as a multiplication factor of
K1*K2*K3*K4*K5*K6*K7)
Figure 3:Cable Inputs
Load (Induction motor):
I.M Output Power = 90kW
Consumed power = 97.32kW
Power Factor
= 80%
FLA
= 169.2 A
Dinesh R
Figure 4:Load Inputs
Let’s Select
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4 Core 185 Sq.mm cable
No of run 1
Length100m
Resistance=0.205Ω/Km
Reactance=0.074 mho/Km
Total De rating Current of 185 Sq.mm Cable= 301x0.93 =279.93 Amp
Voltage Drop of Cable = (1.732x Full Load Current x (RcosǾ+jsinǾ) x Cable Length x 100) /
(Line Voltage x No of Runx1000)
= (1.732 x 169.2 x (0.205x0.8+0.074x0.6) x 100 x100) /(415x1x1000)
Voltage Drop of Cable = 1.8%