Technical data
97
Calculation example
Drive:
• ACS800-04-0075-3
• supply voltage U = 410 V
Transformer:
• rated power S
N
= 600 kVA
• rated voltage U
N
= 430 V
• transformer impedance z
k
= 7.2%.
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.
·
(430 V)
2
600 kVA
= 22.19 mohm
Z
k
= z
k
·
U
N
2
S
N
= 0.072
m
·
0.398
ohm
km
= 67.66 mohm
R
c
= 170
m
·
0.082
ohm
km
= 13.94 mohm
X
c
= 170
=
410 V
2 ·
(67.66 mohm)
2
+ (22.19 mohm + 13.94 mohm)
2
I
k2-ph
= 2.7 kA
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