ABB ACS800-04M - Calculation Example

104 Technical data
Calculation example
Drive:
• ACS800-04-0260-3
• supply voltage U = 410 V
Transformer:
• rated power S
N
= 3000 kVA
• rated voltage U
N
= 430 V
• transformer impedance z
k
= 7.2%.
Supply cable:
• length = 170 m
• resistance/length = 0.112 ohm/km
• reactance/length = 0.0273 ohm/km.
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.
·
(430 V)
2
3000 kVA
= 4.438 mohm
Z
k
= z
k
·
U
N
2
S
N
= 0.072
m
·
0.112
ohm
km
= 19.04 mohm
R
c
= 170
m
·
0.0273
ohm
km
= 4.641 mohm
X
c
= 170
=
410 V
2 ·
(19.04 mohm)
2
+ (4.438 mohm + 4.641 mohm)
2
I
k2-ph
= 9.7 kA