Abb Abb Switzerland Ltd - ABB SYN 5201 Operating Instructions Manual

Operating Instructions
5.2.2 Compensation of phase-angle difference
In many cases it's possible to use a compensation vt of single phase type instead of a
more expensive three phase type by choosing the most suitable connection.
Compared to the primary side, the secondary side is shifted by +30 DEG or -30 DEG (=
+330 DEG). If the phase selection on the secondary side has been carried out correctly,
the phase difference will be 0 DEG with closed circuit breaker.
5.3 Sequences of the synchronizing process
The switch-on sequences are as follows:

The electronics power supply must be switched on first (Recommendation:
permanent operation)

All pre-selections (parameter set, paralleling point and possibly others) must then be
made via the digital inputs.

Once all pre-selections have been made, the synchronizing process is selected by
means of the Start pulse. The pre-selections can be made at the same time as the
Start pulse. The pulse must be at least 0.5 seconds long (recommended length: 1 to
2 s), can, however, also be active up until the end of the synchronizing process
(Stop).

Immediately after the Start command, the relay contacts for selection of the
paralleling point close. The settable blocking time t block prevents commands being
issued between selection and connection of the measuring voltages. The time
t block does not expire if the parameter set has not been selected or if another
criterion for synchronization is not fulfilled. If the parameter set is selected
subsequently, t block is then started. The default setting for t block is 2 seconds.
abb
ABB Switzerland Ltd
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U1
L1, N
Yd1 or Yd11
=> 30 °phase shift
U2
L1, L2, L3
G
S05004
Document No Art Part
L1
Un/ 3
Un/ 3
N
Lx
30 °
Un
Ly
3BHS109762 E01
SYN 5201/SYN 5202
compensation
vt
Un
Language Revision page
en D 68