• a. different phase-neutral voltages are selected (for example UL1 for bus and UL2
for line);
• b. one available voltage is phase-phase and the other one is phase-neutral (for
example UL1L2 for bus and UL1 for line).
The set value is added to the measured line phase angle. The bus voltage is reference
voltage.
If single phase UL1 or two-phase UL1L2 is not available, parameters
PhaseShift and URatio can be used to compensate for other choices.
Table 23: Voltage settings examples
Line voltage
Bus voltage Bus voltage pre-
processing
SESRSYN setting
PhaseShift URatio
UL1 UL1 Connect UL1 to
channel 1
- 1
UL2 Connect UL2 to
channel 1
- 120º 1
UL3 Connect UL3 to
channel 1
+ 120º 1
UL1L2 UL1L2 Connect UL1L2
to channel 1
- 1
UL2L3 Connect UL2L3
to channel 1
- 120º 1
UL3L1 Connect UL3L1
to channel 1
+ 120º 1
UL1 UL1L2 Connect UL1L2
to channel 1
- 30º 1.73
UL2L3 Connect UL2L3
to channel 1
- 90º 1.73
UL3L1 Connect UL3L1
to channel 1
+150º 1.73
Synchronizing settings
OperationSynch
The setting Off disables the Synchronizing function. With the setting On, the function
is in service and the output signal depends on the input conditions.
FreqDiffMin
The setting FreqDiffMin is the minimum frequency difference where the system are
defined to be asynchronous. For frequency difference lower than this value the
systems are considered to be in parallel. A typical value for the FreqDiffMin is 10
mHz. Generally, the value should be low if both, synchronizing and synchrocheck
function is provided as it is better to let synchronizing function close as it will close at
the exact right instance if the networks run with a frequency difference.
Section 10 1MRK 505 291-UEN A
Control
194
Application manual
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