Secondary Test; Check The Activation Of The Voltage Control Operation - Hitachi Relion 670 Series Commissioning Manual

1MRK 511 403-UEN Rev. L
Terminology
The busbar voltage U
Uij is the phase-phase voltage, Uij = Ui -Uj, or Ui, where Ui is one single-phase-to-earth voltage.
I is a shorter notation for the measured load current; it is to be used instead of the three-phase
L
quantities IL1, IL2, IL3 or the two-phase quantities Ii and Ij, or single-phase current Ii.
For cases where single-mode voltage control is implemented, the Parameter Setting menu structure
includes TR1ATCC:1 instead of the parallel designator TR8ATCC:1.
11.10.5.1

Secondary test

The voltage control function performs basic voltage regulation by comparing a calculated load
voltage (U
and U1 respectively). The calculated load voltage U
voltage U
When the load voltage U
If U < U1 or U
L
setting t1 and t1Use. The command timer will operate while the measured voltage stays outside the
inner deadband (defined by setting UDeadbandInner).
If U remains outside of the voltage range defined by UDeadband and the command timer expires,
L
the voltage control will execute a raise or lower command to the transformer tap changer. This
command sequence will be repeated until U
11.10.5.2

Check the activation of the voltage control operation

1. Confirm Transformer Tap Control = On and Transformer Voltage Control = On
•
Main menu /Settings /IED Settings /Control /TransformerTapChanger(84,⇅) /
TCMYLTC(84,⇅):x/TCLYLTC(84,⇅):x /Operation
•
Main menu /Settings /IED Settings /Control /TransformerVoltageControl(90,↕) /
TR1ATCC(90, U↕):x/TR8ATCC(90, U↕||):x /General /Operation
•
Main menu /Settings /IED Settings /Control /TransformerTapChanger(84,⇅) /
TCMYLTC(84,⇅):x/TCLYLTC(84,⇅):x /EnabTapCmd
Bay control REC670
Commissioning manual
is a shorter notation for the measured voltages UL1, UL2, UL3 or Uij, where
B
Also note that for simplicity, the Parameter Setting menu structures included in the
following procedure are referred to universally as VCP1, for example, Main menu /
Settings /IED Settings /Control /TransformerVoltageControl(90, U↕) /
TR1ATCC(90, U↕):x/TR8ATCC(90, U↕||):x /Time /t1 and t2
) against a voltage range defined by setting UDeadband (with upper and lower limits U2
L
adjusted for Load drop compensation (LDC) where enabled in settings.
B
Note that when LDC is disabled, U
stays within the interval between U1 and U2, no action will be taken.
L
> U2, a command timer will start, which is constant time or inverse time defined by
L
Direct tap change control
Automatic transformer voltage control
Enable Tap Command
© 2017 - 2022 Hitachi Energy. All rights reserved
represents the secondary transformer bus
L
equals U .
B L
is brought back within the inner deadband range.
L
Section 11
Testing functionality by secondary injection
SEMOD175185-145 v5
SEMOD175185-537 v10
171