Calculation Example - ABB ACS800-U4 Hardware Manual

Calculation example

Drive:
• ACS800-04-0075-3
• supply voltage U = 410 V
Transformer:
• rated power S
• rated voltage U
• transformer impedance z
Supply cable:
• length = 170 m
• resistance/length = 0.398 ohm/km
• reactance/length = 0.082 ohm/km.
The calculated short-circuit current 2.7 kA is higher than the minimum short-circuit current of the drive
gG fuse type OFAF00H160 (2400 A). -> The 500 V gG fuse (ABB Control OFAF00H160) can be used.
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= 600 kVA
N
= 430 V
N
= 7.2%.
k
2
U
(430 V)
N
·
Z = z · = 0.072
k k
S
600 kVA
N
ohm
m · 0.398
R = 170
c
km
ohm
m · 0.082
X = 170
c
km
410 V
I
=
k2-ph
(67.66 mohm)
2 ·
2
= 22.19 mohm
= 67.66 mohm
= 13.94 mohm
2
+ (22.19 mohm + 13.94 mohm)
= 2.7 kA
2
Technical data
97