15.11.1.1 Testing the synchronizing function
This section is applicable only if the synchronizing function is included.
The voltage inputs used are:
UP3LN1 UL1, UL2 or UL3 line 1 voltage inputs on the IED
UP3BB1 Bus1 voltage input on the IED
Testing the frequency difference
The frequency difference is in the example set at 0.20 Hz on the local HMI, and the
test should verify that operation is achieved when the FreqDiffMax frequency
difference is lower than 0.20 Hz. The test procedure below will depend on the
settings used.
1. Apply voltages
1.1. U-Line = 100% UBaseLine and f-line = 50.0 Hz
1.2. U-Bus = 100% UBaseBus and 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 = 100% UBaseBus 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.
15.11.1.2 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 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.
1MRK 502 029-UEN A Section 15
Verifying settings by secondary injection
215
Installation and commissioning manual
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