VAMP 259 - Page 120

2.19 Synchrocheck (25)
2 Protection functions
Technical description
120
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VM259.EN007
the breaker within the request timeout setting. See below the
figure.
Figure 2.19-1 The principle of the synchrocheck function
Please note that the control pulse of the selected object should
be long enough. For example, if the voltages are in opposite
direction, the synchronising conditions are met after several
seconds.
Figure 2.19-2 The block diagram of the synchrocheck and the controlling
object
Please note that the wiring of the secondary circuits of voltage
transformers to the device terminal depends on the selected
voltage measuring mode.
Table 2.19-1 Voltage measurement modes for synchrocheck
function
Voltage
input
Terminals
Signals in mode
―3LN/1LLy‖
Signals in mode
―3LN/1LNy‖
U
L1
X1:11-12
U
L1
U
L1
U
L2
X1:13-14
U
L2
U
L2
U
L3
X1:15-16
U
L3
U
L3
U
Sync
X1:17-18
U
L12 (phase to phase sync voltage)
U
L1 (phase to ground sync voltage)
Number of
synchrocheck stages
1
1
Availability of U
0
and
directional I
0
stages
Yes
Yes
Power measurement
3-phase power,
nonsymmetrical loads
3-phase power,
nonsymmetrical loads