ABB SYN 5201 Operating Instructions Manual page 41

Operating Instructions
A misinterpretation of the measurement can lead to serious damage to the plant. If no-
Caution
voltage lines are detected, it is essential to make sure that the measuring circuits
(voltage transformers, fuses and input cables) are functioning 100 % correctly. Only then
should the release signal Release DB be given. In dual channel synchronizing systems,
two different transformer circuits for the two channels should be connected whenever
possible in order to avoid a risk in the event of loss of phase. If, instead of the star point,
one of the phases is earthed on the secondary side, this does not affect normal
synchronizing operation, however, a failure of the earthed phase cannot be detected by
the synchronizing device.
4.2.5 Parameter group Voltage Matcher
Test function to determine the voltage adjusting characteristic TEST U-Match
This test function determines the plant-dependent setting value of the parameter dU/dt.
After the test function is started, SYNCHROTACT 5 issues different Higher and Lower
commands to the voltage regulator in order to test its sensitivity. The duration of the test
function is generally 1 to 2 minutes.
Once started, the test function is automatically cancelled if  U  reaches  10 %.
Caution
Nonetheless, it is recommended that you prepare for any manual cancellation by noting
the following key combination:
If the voltage matcher is used as a tap changer matcher or with the INVERSE U-
Note
function, the test function makes no sense and is therefore blocked.
Procedure:
1. Start conditions:
2. Change address to parameter TEST U-Match in the corresponding parameter set
and in the parameter group "Voltage Matcher"
3. Set Test U-Match to ON
4. Confirm with
5. Enable test function by pressing:
6. Start test function within 30 s following enable:
7. Wait for end of test function (1 to 2 minutes), then read result for dU/dt
8. Change address to parameter dU/dt: (1*
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DATA
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DATA
- Running machine
- U1 and f1, both between 95 % and 105 %,
- U2 and f2, both between 85 % and 115 %
- Corresponding parameter set is selected
- SYNCHROTACT 5: parameter INVERSE U = OFF
- Device blocked (blocking: see section 7)
DATA
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parameter TAP CHANGER = OFF
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) and set read value
3BHS109762 E01
SYN 5201/SYN 5202
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Language Revision page
en D 41