BD01 System – 40 ... 160 A - GRUP DAP

BD01 System — 40 ... 160 A
© Siemens AG 2007
Engineering information
Voltage drop
Voltage drop at rated current
(Load distribution factor a = 1)
30
Calculation of the voltage drop
For long busbar runs, it may be necessary to calculate the
voltage drop.
∆U = a × !3 ×I B × l ×(R × cos ϕ + X ×sinϕ) ×10 –3
(V)
U (V/100 m)
28
26
40 A
24
22
63 A
20
125 A
160 A
18
100 A
16
14
12
10
0,4 0,5 0,6 0,7 0,8 0,9 1
cos
NSV0_00070
with
∆U = Voltage drop (V)
I B = Operational current (A)
l = Length (m)
a = Load distribution factor see Table
R = Ohmic resistance R 20 (mΩ/m)
X = Inductive resistance X 20 (mΩ/m)
cos ϕ = Power factor
Factor a used in the equation for calculating the voltage drop is
dependent on the load distribution.
Load distribution
A
A
A
B
B
B
D
C
C
A
A
D
D
E
E
B
E
C
C
F
B
Factor a
Supply at A,
one tap-off at B 1
Supply at A,
tap-offs at B, C, D, E 0.5
Supply at A,
tap-offs at B, C 0.25
Supply at A,
tap-offs at B, C, D, E 0.125
Supply at A, B,
tap-off at C, D, E, F 0.25
4
4/32 Siemens LV 70 · 2006