condition, the voltage regulation function is not blocked and a lower
command should be issued from the IED.
10.9.4.6 Check the overcurrent block function
SEMOD175185-605 v6
1. Confirm the setting for Iblock in the local HMI under Main menu/
Settings/IED Settings/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/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 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.
10.9.4.7 Single transformer
SEMOD175185-669 v2
Load drop compensation
SEMOD175185-672 v5
1. Confirm that OperationLDC is set to On.
2. Confirm settings for Rline and Xline.
3. Calculate the expected load voltage U
L
(displayed as a measured value on the
local HMI) based on secondary injection of transformer secondary voltage
(U
B
= USet) and rated load current (I
L
= I1Base), in accordance with
equation 10.
EQUATION2080 V3 EN-US
(Equation 10)
where:
U
L
, I
L
= Re(I
L
) + jlm(I
L
) are complex phase quantities
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:
Section 10 1MRK 506 377-UEN C
Testing functionality by secondary injection
146 Railway application RER670 2.2 IEC
Commissioning manual
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