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

Section 11
Testing functionality by secondary injection
Terminology
The busbar voltage U
where 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-
L
phase 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.
11.10.3.1

Secondary test

The voltage control function performs basic voltage regulation by comparing a calculated load
voltage (U
limits U2 and U1 respectively). The calculated load voltage U
transformer bus voltage U
settings.
When the load voltage U
If U < U1 or U
L
defined by setting
stays outside the inner deadband (defined by setting
If U remains outside of the voltage range defined by
L
expires, the voltage control will execute a raise or lower command to the transformer tap
changer. This command sequence will be repeated until U
deadband range.
11.10.3.2

Check the activation of the voltage control operation

220
During the installation and commissioning, the behavior of the voltage control
functions for different tests may be governed by a parameter group, available
on the local HMI under Main menu/Settings/IED Settings/Control/
TransformerVoltageControl(ATCC,90)/TR1ATCC:x/TR8ATCC:x. These
parameter settings can cause a Total Block, Automatic Block or Alarm for a
variety of system conditions including over and under voltage, over current and
tap changer failure. It is important to review these settings and confirm the
intended response of the voltage control function for different secondary
injection tests.
is a shorter notation for the measured voltages UL1, UL2, UL3 or Uij,
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(ATCC,90)/TR1ATCC:x/TR8ATCC:x/Time/t1 and
t2l.
) against a voltage range defined by setting
L
adjusted for Load drop compensation (LDC) where enabled in
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
L
t1 and t1Use . The command timer will operate while the measured voltage
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UDeadband (with upper and lower
represents the secondary
L
equals U .
B L
UDeadbandInner ).
UDeadband and the command timer
is brought back within the inner
L
Transformer protection RET670
1MRK 504 165-UEN E
SEMOD175185-145 v5
SEMOD175185-537 v9
Commissioning manual