, , , ,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
equation
21.
¦ 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+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 UB 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.
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
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