7. Confirm that the calculated value for load voltage, displayed on the local HMI,
is equal to that derived through hand calculations.
8. When setting OperationLDC set to On, the voltage regulation algorithm uses the
calculated value for load voltage as the regulating quantity to compare against
USet and the voltage deadband limits UDeadband and UDeadbandInner.
9. While injecting rated current I2Base into the IED, inject a quantity for U
B
that
is slightly higher then USet + |(Rline+jXLine) · I
L
|. This will ensure that the
regulating voltage U
L
is higher than USet, and hence no tap change command
should be issued from the IED.
10. Reduce the injected voltage for U
B
slightly below USet + |(Rline+jXLine) · I
L
|
and confirm that the calculated value for load voltage is below USet and a tap
change command is issued from the IED.
10.9.4.8 Parallel voltage regulation
Master follower voltage regulation
1. For the transformers connected in the parallel group, confirm that
OperationPAR is set to MF.
2. For parallel operation, it is also recommended to confirm for parallel group
membership, defined by setting TnRXOP in the local HMI under Main menu/
Settings/Setting group N/Control/TransformerVoltageControl(ATCC,
90)/TR8ATCC:x/ParCtrl
The general parallel arrangement of transformers are defined by setting
TnRXOP to On or Off. The following rules are applicable on the settings
T1RXOP – T4RXOP.
If IED T1 and T2 are connected,
• T1RXOP shall be set to On in instance 2 of TR8ATCC,
• T2RXOP shall be set to On in instance 3 of TR8ATCC,
• T2RXOP and T3RXOP shall be set to On in instance 1 of TR8ATCC, and
so on.
The parameter corresponding to the own IED must not be set.
T1RXOP should thus not be set in IED T1, T2RXOP not in IED
T2, and so on.
3. The lowest transformer number in the parallel group is by default set as the
Master – confirm that this is the case by reviewing the setting in the local HMI.
4. Review the settings for UDeadband (based on percentage of nominal bus
voltage) and calculate the upper (U2) and lower (U1) voltage regulation limits
for which a tap change command will be issued from the master transformer in
the group.
5. Review the expected time for first (t1) and subsequent (t2) tap change
commands from the master transformer in the local HMI under Main menu/
Section 10 1MRK 511 360-UEN A
Testing functionality by secondary injection
162 Bay control REC670 2.1 IEC
Commissioning manual
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