1.1. U-Line = 100% UBaseLine and f-Line = 50.0 Hz
1.2. U-Bus = 100% UBaseBus and f-Bus = 50.15Hz
2. Check that a closing pulse is submitted at a closing angle equal to calculated
phase angle value from the formula below. Modern test sets will evaluate this
automatically.
Closing Angle = |( (f
Bus
– f
Line
) * tBreaker * 360 degrees) |
f
Bus
= Bus frequency
f
Line
= Line frequency
tBreaker = Set closing time of the breaker
3. Repeat with
3.1. U-Bus = 100% UBaseBus and f-bus = 50.25 Hz, to verify that the function
does not operate when frequency difference is above limit.
4. Verify that the closing command is not issued when the frequency difference is
less than the set value FreqDiffMin.
12.10.1.2 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 line 1 voltage input on the IED according to the connection in SMT
U-Bus Bus voltage input on the IED according to the connection in SMT
Testing the voltage difference
Set the voltage difference to 0.15 p.u. on the local HMI, and the test should check that
operation is achieved when the voltage difference UDiffSC is lower than 0.15 p.u.
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% GblBaseSelLine and U-Bus = 80%
GblBaseSelBusGblBaseSelBus with the same phase-angle and frequency.
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% GblBaseSelBus, and the U-Line = 90%
GblBaseSelLine and also the opposite condition.
5. Check that the two outputs for manual and auto synchronism are not activated.
1MRK502053-UEN B Section 12
Testing functionality by secondary injection
Generator protection REG670 2.0 IEC 205
Commissioning manual
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