Testing The Synchronizing Check - ABB RET670 Installation And Commissioning Manual

1MRK 504 088-UEN C
13.11.1.2
Installation and commissioning manual
1.1. U-Line = 100% UBase
1.2. f-line = 50.0 Hz and U-Bus = 100% UBase
1.3. f-bus = 50.2 Hz
2. Check that a closing pulse is submitted and at closing angle less than 2
degrees from phase equality. Modern test sets will evaluate this automatically.
3. Repeat with
3.1. U-Bus = 80% UBase
3.2. f-bus = 50.25 Hz, to 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.

Testing the synchronizing 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.
Verifying settings by secondary injection
Section 13
177