Secondary Test; Check The Activation Of The Voltage Control Operation - ABB RET670 Commissioning Manual

1MRK 504 165-UUS -
11.10.3.1
11.10.3.2
Transformer protection RET670 2.2 ANSI
Commissioning manual
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/Setting Group N/Control/
TransformerVoltageControl(ATCC,90)/TR1ATCC:x/
TR8ATCC:x/Time/t1 and t2l.
For cases where single-mode voltage control is implemented, the Parameter Setting menu
structure includes TR1ATCC:1 instead of the parallel designator TR8ATCC:1.

Secondary test

The voltage control function performs basic voltage regulation by comparing a calculated
load voltage (V ) against a voltage range defined by setting VDeadband (with upper and
L
lower limits V2 and V1 respectively). The calculated load voltage V
secondary transformer bus voltage V
enabled in settings.
Note that when LDC is disabled, V
When the load voltage V
taken.
If V < V1 or V > V2, a command timer will pickup, which is constant time or inverse
L L
time defined by setting t1 and t1Use. The command timer will trip while the measured
voltage stays outside the inner deadband (defined by setting VDeadbandInner).
If V remains outside of the voltage range defined by VDeadband and the command timer
L
expires, the voltage control will execute a raise or lower command to the transformer tap
changer. This command sequence will be repeated until V
inner deadband range.

Check the activation of the voltage control operation

1. Confirm Transformer Tap Control = Enable and Transformer Voltage Control =
Enable
• Direct tap change control
Main menu/Settings/Setting Group N/Control/
TransformerTapChanger(YLTC,84)/TCMYLTC:x/TCLYLTC:x/Operation
Testing functionality by secondary injection
adjusted for Load drop compensation (LDC) where
B
stays within the interval between V1 and V2, no action will be
L
Section 11
represents the
L
equals V .
B L
is brought back within the
L
249