7
05.01
7.2 Voltage matching
7-214
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Siemens AG 2012 All Rights Reserved
SIMODRIVE 611 Configuration Manual (PJU) – 02/2012 Edition
Matching transformer for 36/47 kW I/R module sinusoidal current:
uk matching transformer = 3%; S
K plant
= 50000 kVA ; S
K line
for I/R 36/47 kW
sinusoidal current according to Table 7-1: S
K line
= 2520 kVA
based on a)
S
n1
= 1.27
36 kW = 45.72
46 kVA
based on b)
Calculation of Sn2
Case 1:
S
n2
= 79.61
80 kVA
50000
2520
3
(50000 – 2520)
100
S
n2
> S
n1
⇒
S
n2
is decisive
The matching transformer requires a rated power S
n
of 80 kVA
at a uk of 3%.
Case 2:
If the uk of the matching transformer is less than, e.g. uk=1%
for otherwise unchanged conditions for Case 1:
S
n2
= 26.54
27 kVA
50000
2520
1
(50000 – 2520)
100
S
n1
> S
n2
⇒
S
n1
is decisive
The matching transformer requires an Sn rated power of 46 kVA
at a uk of 1%.
Examples
7 Line Supply Connection
05.08