ABB REG670 2.0 IEC, Commissioning Manual

Page: 228 / 268

4. Review the setting for CircCurrBk to confirm whether a circulating current limit
will result in an Alarm state, Auto Block or Auto&Man Block of the automatic
voltage control for tap changer, for parallel control function TR8ATCC.
5. Inject a voltage U
B
equal to USet for each transformer.
6. Inject a load current for Transformer 1 that is equal to rated load current I2Base
and a load current for Transformer 2 that is 1% less than ( I2Base – ( I2Base ·
CircCurrLimit))
7. Confirm that the automatic voltage control for tap changer, for parallel control
function TR8ATCC responds in accordance with the setting for
CircCurrBk .
Alarm and blocking conditions can be confirmed through interrogation of the
event menu or the control menu on the local HMI.
VTmismatch during parallel operation
1. Confirm that OperationPAR is set to MF for each transformer in the parallel
group.
2. Review the setting for VTmismatch and tVTmismatch .
3. Inject a voltage U
B
equal to USet for Transformer 1 and a voltage less than ( USet
– ( VTmismatch · USet )) for Transformer 2.
4. This condition should result in a VTmismatch which will mutually block the
operation of the automatic voltage control for tap changer, parallel control
function TR8ATCC for all transformers connected in the parallel group, which
can be confirmed through interrogation of the local HMI.
5. Confirm that the automatic voltage control for tap changer, parallel control
function TR8ATCC responds in accordance with the setting for
CircCurrBk .
12.10.3.9 Completing the test
Continue to test another function or end the test by changing the TestMode setting to
Off . Restore connections and settings to their original values, if they were changed for
testing purposes.
12.10.4 Single command, 16 signals SINGLECMD
For the single command function block, it is necessary to configure the output signal
to corresponding binary output of the IED. The operation of the single command
function (SINGLECMD) is then checked from the local HMI by applying the
commands with
Mode = Off , Steady or Pulse , and by observing the logic statuses of
the corresponding binary output. Command control functions included in the
operation of different built-in functions must be tested at the same time as their
corresponding functions.
12.10.5 Interlocking
Prepare the IED for verification of settings outlined in section "Requirements" and
section "Preparing for test" in this chapter.
Section 12
1MRK502053-UEN B
Testing functionality by secondary injection
222 Generator protection REG670 2.0 IEC
Commissioning manual