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.
12.10.3.1 Secondary test
The voltage control function performs basic voltage regulation by comparing a
calculated load voltage (U
L
) against a voltage range defined by setting UDeadband
(with upper and lower limits U2 and U1 respectively). The calculated load voltage U
L
represents the secondary transformer bus voltage U
B
adjusted for Load drop
compensation (LDC) where enabled in settings.
Note that when LDC is disabled, U
B
equals U
L
.
When the load voltage U
L
stays within the interval between U1 and U2, no action will
be taken.
If U
L
< U1 or U
L
> U2, a command timer will start, which is constant time or inverse
time defined by setting t1 and t1Use. The command timer will operate while the
measured voltage stays outside the inner deadband (defined by setting
UDeadbandInner).
If U
L
remains outside of the voltage range defined by UDeadband and the command
timer expires, the voltage control will execute a raise or lower command to the
transformer tap changer. This command sequence will be repeated until U
L
is brought
back within the inner deadband range.
12.10.3.2 Check the activation of the voltage control operation
1. Confirm Transformer Tap Control = On and Transformer Voltage Control = On
• Direct tap change control
Main menu/Settings/Setting Group N/Control/
TransformerTapChanger(YLTC,84)/TCMYLTC:x/TCLYLTC:x/
Operation
• Automatic transformer voltage control
Main menu/Settings/Setting Group N/Control/
TransformerVoltageControl(ATCC,90)/TR1ATCC:x/TR8ATCC:x/
General/Operation
• Enable Tap Command
Section 12 1MRK502053-UEN B
Testing functionality by secondary injection
214 Generator protection REG670 2.0 IEC
Commissioning manual
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