Siemens SIMODRIVE 611 digital - Page 207

7
05.01
7.2 Voltage matching
7-207
© Siemens AG 2008 All Rights Reserved
SIMODRIVE 611 Configuration Manual (PJU) -- 05/2008 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 6-6: 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
7L
i
ne Su
p
p
l
y
Connec
t
i
on05.08
Aotewell Ltd
www.aotewell.com
Industry Automation
HongKong|UK|China
sales@aotewell.com
+86-755-8660-6182