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12.2.4
12.2.5
Synchrocheck and energizing check (SYN)
Testing the frequency difference
The frequency difference is set at 50 mHz on the HMI, and the test should verify that operation
is achieved when the FreqDiff frequency difference is lower than 50 mHz.
Use the same HMI setting as in
Test with FreqDiff = 0 mHz
1.
Apply voltages U-Line (UL1) equal to 100% U1b and U-Bus (U5) equal
to 100% U1b, with a frequency difference equal to 0 mHz and a phase
difference lower than 45°.
2.
Check that the SYN1-AUTOOK and SYN1-MANOK outputs are acti-
vated.
Test with FreqDiff = 1Hz
1.
Apply voltage to the U-line (UL1) equal to 100% U1b with a frequency
equal to 50 Hz and voltage U-bus (U5) equal to 100% U1b, with a fre-
quency equal to 49 Hz.
2.
Check that the two outputs are NOT activated.
The test can be repeated with different frequency values to verify that the
function operates for values lower than the set ones. If the FREJA pro-
gram, Test of synchronizing relay, is used the frequency can be changed
continuously.
Note!
A frequency difference also implies a floating mutual-phase difference. So the SYN1-AUTOOK
and SYN1-MANOK outputs might NOT be stable, even though the frequency difference is within
set limits, because the phase difference is not stable!
Testing the reference voltage
1.
Use the same basic test connection as in
The UDiff between the voltage connected to U-bus and U-line should be
0%, so that the SYN1-AUTOOK and SYN1-MANOK outputs are acti-
vated first.
2.
Change the U-Line voltage connection to UL2 without changing the
setting on the HMI.
3.
Check that the two outputs are NOT activated.
4.
The test can also be repeated by moving the U-line voltage to the UL3
input.
Verifying settings by secondary
section 12.2.3 "Testing the phase
Figure
19.
Chapter 13
injection
difference".
113
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