,
,
,
,
ul im ub im xline il re rline il im
=
-
×
-
×
EQUATION2084 V1 EN-US
(Equation 43)
where:
ub
is the complex value of the busbar voltage
il
is the complex value of the line current (secondary side)
rline
is the value of the line resistance
xline
is the value of the line reactance
For comparison with the set-point value, the modulus of U
L
¦ U
L
¦ = (ul , re)
2
+ (ul , im)
2
EQUATION2086 V2 EN-US
(Equation 44)
4.
Inject voltage for U
B
equal to setting
USet
.
5.
Inject current equal to rated current
I2Base
.
6.
Confirm on the local HMI that service values for bus voltage and load current are equal to
injected quantities.
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.
11.10.5.8
Parallel voltage regulation
SEMOD175185-714 v2
Master follower voltage regulation
SEMOD175185-716 v8
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/IED Settings/Control/
TransformerVoltageControl(90, U↕) /TR8ATCC(90, U↕||):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.
Section 11
1MRK 511 403-UEN Rev. L
Testing functionality by secondary injection
174
Bay control REC670
Commissioning manual
© 2017 - 2022 Hitachi Energy. All rights reserved
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