BD01 System – 40 ... 160 A - GRUP DAP

© Siemens AG 2007
BD2 System — 160 ... 1250 A
Engineering information
Temperature characteristic of BD2 systems
0,23
NSV0_00193
Rated current (%)
120
115
110
105
100
95
90
85
80
75
70
65
–5 5 51 52 53 54 55 56
Ambient temperature °C
(24h average)
Voltage drop
Voltage drop at rated current
The following diagrams show the voltage drop of the
BD2A/BD2C systems
• Taking into account the heat resistors
(according to IEC/EN 60439-2)
• With a load distribution factor a = 1
• Under loading with the rated current. (With a different load
distribution factor the curve value must be multiplied by the
corresponding distribution factor.)
NSV0_00186
U (V/m)
0,21
0,19
0,17
0,15
0,13
0,11
0,09
0,07
0,4 0,5 0,6 0,7
0,8 0,9 1,0
cos
Voltage drop BD2C
Calculation of the voltage drop
With long runs you may need to calculate the voltage drop.
DU = a x !3 x I x l x (R x cos v + X x sin v) x 10 -3
BD2C-.-315
BD2C-.-400
BD2C-.-250
BD2C-.-630
BD2C-.-1000
BD2C-.-500
BD2C-.-1250
BD2C-.-800
BD2C-.-160
(V)
0,24
NSV0_00192
∆U = Voltage drop (V)
I = Load current (A)
U (V/m)
0,22
BD2A-.-315
l = Length (m)
a = Load distribution factor
0,20
R = Ohmic resistance R 1 (mΩ/m)
BD2A-.-250
X = Inductive resistor X 1 (mΩ/m)
0,18
cos ϕ = Power factor
0,16
0,14
0,12
0,10
BD2A-.-630
BD2A-.-160
BD2A-.-400
BD2A-.-800
BD2A-.-1000
BD2A-.-500
Factor "a" used in the equation for calculating the voltage drop is
dependent on the load distribution.
Load distribution
Load distribution
A
A
B
C
D
B
E
Factor a
Supply at A,
one tap-off at B 1
Supply at A,
tap-offs at B, C, D, E 0.5
5
0,08
0,4 0,5 0,6 0,7
Voltage drop BD2A
0,8 0,9 1,0
cos
A
B
B
D
C
A
A
D
E
E
C
C
F
B
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,
tap-off at C, D, E, F 0.25
Siemens LV 70 · 2006
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