Check The Overcurrent Block Function; Single Transformer - ABB Relion 670 Series Commissioning Manual

Section 11
Testing functionality by secondary injection
Settings/Control/TransformerVoltageControl(ATCC,90)/TR1ATCC:x/TR8ATCC:x/
UVPartBk and Main menu/IED Settings/Control/TransformerVoltageControl/
TR1ATCC:x/TR8ATCC:x/OVPartBk. These conditions may cause an alarm or total block
of the voltage control function to be displayed on the local HMI.
3. Decrease the injected voltage slightly below the
corresponding blocking or alarm condition on the local HMI. For an alarm condition, the
voltage regulation function is not blocked and a raise command should be issued from
the IED.
4. Increase the applied voltage slightly above the
corresponding blocking or alarm condition on the local HMI. For an alarm condition, the
voltage regulation function is not blocked and a lower command should be issued from
the IED.
11.9.4.6

Check the overcurrent block function

1. Confirm the setting for
Control/TransformerVoltageControl(ATCC,91)/TR1ATCC:x/TR8ATCC:x/TCCtrl/Iblock
2. Confirm the voltage control function response to an applied current above
reviewing the settings in the local HMI under Main menu/Settings/IED 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
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.
11.9.4.7

Single transformer

Load drop compensation
1. Confirm that
2. Confirm settings for
3. Calculate the expected load voltage U
based on secondary injection of transformer secondary voltage (U
load current (I
EQUATION2080 V3 EN-US
where:
U
When all secondary phase-to-earth voltages are available, use the positive-sequence
components of voltage and current. By separation of real and imaginary parts:
ul re ub re rline il re
EQUATION2082 V1 EN-US
158
Iblock in the local HMI under Main menu/Settings/IED Settings/
OperationLDC is set to On .
Rline and Xline .
I1Base ), in accordance with equation 31.
=
L
, I = Re(I ) + jlm(I ) are complex phase quantities
L L L L
= - × +
, , , xline il im
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Umin value and check for the
Umax value and check for the
Iblock setting and confirm the alarm or blocking
(displayed as a measured value on the local HMI)
L
×
,
1MRK 511 403-UEN E
SEMOD175185-605 v6
Iblock , by
SEMOD175185-669 v2
SEMOD175185-672 v5
USet ) and rated
=
B
(Equation 31)
(Equation 32)
Bay control REC670
Commissioning manual