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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
+j
XLine
) · 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
+j
XLine
) · I
L
|
and confirm that the calculated value for load voltage is below
USet
and a tap
change command is issued from the IED.
12.10.3.8
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 12
1MRK502053-UEN B
Testing functionality by secondary injection
218
Generator protection REG670 2.0 IEC
Commissioning manual
Содержание REG670 2.0 IEC
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