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,
,
,
,
ul im ub im xline il re rline il im
=
-
×
-
×
EQUATION2084 V1 EN
(Equation 20)
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
are according to
¦ U
L
¦ = (ul , re)
2
+ (ul , im)
2
EQUATION2086 V2 EN
(Equation 21)
4.
Inject voltage for UB 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 UB
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 UB 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.
13.11.4.8
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)/VCPx/ParCtrl
Section 13
1MRK 504 088-UEN C
Verifying settings by secondary injection
188
Installation and commissioning manual
Содержание RELION RET670
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