VAMP 257
Feeder and motor manager
Technical description
VAMP Ltd
72
VAMP 24h support phone : +358 (0)20 753 3264
VM257.EN002
2.3.24.
Synchrocheck (25)
VAMP257 includes a function that will check synchronism
when the circuit-breaker is closed. The function will monitor
voltage amplitude, frequency and phase angle difference
between two voltages. Since there are two stages available, it is
possible to monitor three voltages. The voltages can be busbar
and line or busbar and busbar (bus coupler).
The synchrocheck causes that the normal measuring modes
cannot be used. Therefore, “2Side”, “2Side+U
0
” or “3Side”
voltage measuring mode must be selected to enable
synchrocheck function. If “2Side”- or “2Side+U
0
”-mode is
selected, one stage is available. The “3Side”-mode enables using
two stages.
The voltage used for sychrochecking is always phase-to-phase
voltage U
12
. The sychrocheck stage 1 compares U
12
with U
12
y
always. The compared voltages for the stage 2 can be selected.
Setting parameters of synchrocheck stages :
SyC1, SyC2 (25)
Parameter Values
Unit Default Description
Side U12/U12y;
U12/U12z;
U12y/U12z
- U12/U12z
Voltage selection. The stage
1 has fixed voltages
U12/U12y.
CBObj Obj1-Obj6
- Obj1 The selected object for CB
control. The synchrocheck
closing command will use
the closing command of the
selected object.
Note!
The stage 1 is always
using the object 1. The stage
2 can use objects 2-6.
SMode
Async;
Sync; Off
- Sync Synchrocheck
mode.
Off = only voltage check
Async = the function checks
dU, df and dangle.
Furthermore, the frequency
slip, df, determines the
remaining time for closing.
This time must be longer
than “CB time”.
Sync mode =
Synchronization is tried to
make exactly when angle
difference is zero. In this
mode df-setting should be
enough small (<0.3Hz).
