General settings/Control/TransformerVoltageControl(ATCC,91)/VCSx/
VCPx/OVPartBk. This condition may cause an alarm, total or automatic
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.
13.11.4.7 Single transformer
Load drop compensation
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
(UB = USet) and rated load current (I
L
= I1Base), in accordance with
equation 18.
U
L
= UB - (Rline + jXline) . I
L
EQUATION2080 V2 EN (Equation 18)
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:
, , , ,ul re ub re rline il re xline il im= - × + ×
EQUATION2082 V1 EN (Equation 19)
1MRK 504 088-UEN C Section 13
Verifying settings by secondary injection
187
Installation and commissioning manual
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