ABB REG670 2.0 IEC Commissioning Manual page 219

1MRK502053-UEN B
Generator protection REG670 2.0 IEC
Commissioning manual
Testing functionality by secondary injection
TransformerVoltageControl(ATCC,90)/TR1ATCC:x/TR8ATCC:x/
Xr2.
• Confirm that the setting for TCMYLTC or TCLYLTC is in accordance with
transformer data:
• Tap change timeout duration - effectively the maximum transformer tap
change time, tTCTimeout, available on the local HMI under Main menu/
Settings/Setting Group N/Control/TransformerTapControl(YLTC,
84)/TCMYLTC:x/TCLYLTC:x/tTCTimeout.
• Load tap changer pulse duration - required length of pulse from IED to load
tap changer, tPulseDur, available on the local HMI under Main menu/
Settings/Setting Group N/Control/TransformerTapControl(YLTC,
84)/TCMYLTC:x/TCLYLTC:x/tPulseDur.
• Transformer tap range, LowVoltTap and HighVoltTap, available on the
local HMI under Main menu/Settings/General Settings/Control/
TransformerTapControl(YLTC,84)/TCMYLTC:x/TCLYLTC:x/
HighVoltTap and .
• Load tap changer code type - method for digital feedback of tap position,
CodeType, available on the local HMI under Main menu/Settings/
General settings/Control/TransformerTapControl(YLTC,84)/
TCMYLTC:x/TCLYLTC:x/CodeType.
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/General 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.
Terminology
The busbar voltage UB is a shorter notation for the measured voltages Ua, Ub, Uc or
Uij, 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
L
three-phase quantities Ia, Ib, Ic or the two-phase quantities Ii and Ij, or single-phase
current Ii.
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/
Section 12
213