ABB SYN 5201 Operating Instructions Manual page 8

Operating Instructions
2.2 Paralleling functions
The automatic paralleling process can basically be divided into four function blocks:
1. Measuring
2. Voltage and frequency matching
3. Monitoring of paralleling conditions
4. Paralleling command generation
In the following figure, the block circuit diagram of the basic paralleling functions of
SYNCHROTACT 5 is simplified and shows a single-channel configuration. The
individual functions are described more precisely in the following sections.
abb
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SYNCHROTACT 5
Measuring
|U1|
U1
+ U
-
U2
|U2|
s
s
Command
generation
s
Matching
U+
0
˜ ˜
U-
0
˜ ˜
Monitoring of paralleling conditions
U
U< U
max
U
max
s
s<s
max
s
max
<
max
max
OR
t
sup
t
&
v
Document No Art Part
3BHS109762 E01
SYN 5201/SYN 5202
U+
U-
f+ f+
f- f-
&
CHK
RELEASE
CMD COMMAND
pon
S99006
Language Revision
en D
page
8