Check The Overcurrent Block Function; Single Transformer - ABB REG670 Commissioning Manual

1MRK 502 073-UUS A
13.10.3.6
13.10.3.7
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Commissioning manual
condition, the voltage regulation function is not blocked and a lower command
should be issued from the IED.

Check the overcurrent block function

1. Confirm the setting for Iblock in the local HMI under Main menu/Settings/
Setting group N/Control/TransformerVoltageControl(ATCC,91)/
TR1ATCC:x/TR8ATCC:x/TCCtrl/Iblock
2. Confirm the voltage control function response to an applied current above Iblock,
by reviewing the settings in the local HMI under Main menu/Settings/General
settings/Control/TransformerVoltageControl(ATCC,91)/TR1ATCC:x/
TR8ATCC:x/OVPartBk. This condition may cause an alarm or total block of
the voltage control function to be displayed on the local HMI.
3. Inject a current higher than the Iblock setting and confirm the alarm or blocking
condition is present on the local HMI. If an automatic or total blocking condition
occurs, change the applied secondary voltage and confirm that no tap change
commands are issued from the associated binary outputs. This situation can also
be confirmed through reviewing the disturbance and service reports on the local
HMI.

Single transformer

Load drop compensation
1. Confirm that OperationLDC is set to Enabled.
2. Confirm settings for Rline and Xline.
3. Calculate the expected load voltage V
local HMI) based on secondary injection of transformer secondary voltage (VB =
VSet) and rated load current (I
V = VB - (Rline + jXline) . I
L
EQUATION2081-ANSI V2 EN-US
where:
V , I = Re(I ) + jlm(I ) are complex phase quantities
L L L L
When all secondary phase-to-ground voltages are available, use the positive-
sequence components of voltage and current. By separation of real and imaginary
parts:
Testing functionality by secondary injection
(displayed as a measured value on the
L
= I1Base), in accordance with equation 111.
L
L
Section 13
SEMOD175185-605 v5
SEMOD175185-669 v2
SEMOD175185-672 v5
(Equation 111)
263