Calculation Example - ABB ACS800-04 Hardware Manual

104 Technical data

Calculation example

Drive:
•
ACS800-04-0260-3
•
supply voltage
Transformer:
•
S
rated power
N
•
U
rated voltage
•
transformer impedance z
Supply cable:
•
length = 170 m
•
resistance/length = 0.112 ohm/km
•
reactance/length = 0.0273 ohm/km.
Z
k
The calculated short-circuit current 9.7 kA is higher than the minimum short-circuit
current of the drive gG fuse type OFAF3H500 (8280 A). -> The 500 V gG fuse (ABB
Control OFAF3H500) can be used.
U
= 410 V
= 3000 kVA
= 430 V
N
= 7.2%.
k
2
U
(430 V)
N
·
= z · = 0.072
k
S 3000 kVA
N
ohm
m · 0.112
R = 170
c
m · 0.0273
X = 170
c
I
=
k2-ph
(19.04 mohm)
2 ·
2
= 4.438 mohm
= 19.04 mohm
km
ohm
= 4.641 mohm
km
410 V
2
+ (4.438 mohm + 4.641 mohm)
= 9.7 kA
2