Parallel Voltage Regulation - Hitachi Relion 670 Series Commissioning Manual

Section 11
Testing functionality by secondary injection
ul im ub im
EQUATION2084 V1 EN-US
where:
ub
il
rline
xline
For comparison with the set-point value, the modulus of U
¦ U
EQUATION2086 V2 EN-US
4. Inject voltage for U
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
then USet + |(Rline+jXLine) · I
USet, and hence no tap change command should be issued from the IED.
10. Reduce the injected voltage for U
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

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/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,
•
•
•
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.
174
= - × -
, , xline il re rline il im ,
is the complex value of the busbar voltage
is the complex value of the line current (secondary side)
is the value of the line resistance
is the value of the line reactance
2 2
¦ = (ul , re) + (ul , im)
L
equal to setting USet.
B
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.
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×
,
|. This will ensure that the regulating voltage U
L
slightly below USet + |(Rline+jXLine) · I
B
1MRK 511 403-UEN Rev. L
are according to equation 44.
L
that is slightly higher
B
is higher than
L
| and confirm that
L
Bay control REC670
Commissioning manual
(Equation 43)
(Equation 44)
SEMOD175185-714 v2
SEMOD175185-716 v8