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3.1. U-Bus = 100%
UBase
and f-bus = 50.25 Hz
3.2. Verify that the function does not operate when frequency difference is
above limit.
4.
Repeat with different frequency differences for example, 100 mHz with f-bus
nominal and line leading and for example 20 mHz (or just above
FreqDiffMin
) to verify that independent of frequency difference the closing
pulse occurs within 2 degrees.
5.
Verify that the closing command is not issued when the frequency difference
is less than the set value
FreqDiffMin
.
6.7.1.2
Testing the synchrocheck check
During the test of SESRSYN for a single bay arrangement, these voltage inputs are
used:
U-Line
UL1, UL2 or UL3 voltage input on the IED
U-Bus
Bus voltage input on the IED
Testing the voltage difference
Set the voltage difference at 15%
UBase
on the local HMI, and the test should
check that operation is achieved when the voltage difference
UDiffSC
is lower than
15%
UBase
.
The settings used in the test shall be final settings. The test shall be adapted to site
setting values instead of values in the example below.
Test with no voltage difference between the inputs.
Test with a voltage difference higher than the set
UDiffSC
1.
Apply voltages U-Line (for example) = 80%
UBase
and U-Bus = 80%
UBase
.
2.
Check that the AUTOSYOK and MANSYOK outputs are activated.
3.
The test can be repeated with different voltage values to verify that the
function operates within the set
UDiffSC
. Check with both U-Line and U-Bus
respectively lower than the other.
4.
Increase the U-Bus to 110%
UBase
, and the U-Line = 90%
UBase
and also
the opposite condition.
5.
Check that the two outputs for manual and auto synchronism are not activated.
Testing the phase angle difference
The phase angle differences
PhaseDiffM
and
PhaseDiffA
respectively are set to
their final settings and the test should verify that operation is achieved when the
phase angle difference is lower than this value both leading and lagging.
Test with no voltage difference
Section 6
1MRK 511 248-UEN -
Testing functionality
74
Commissioning Manual