Single Transformer - ABB RET670 Installation And Commissioning Manual

1MRK 504 088-UEN C
13.11.4.7
Installation and commissioning manual
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.

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
local HMI) based on secondary injection of transformer secondary voltage
(UB = USet) and rated load current (I
equation 18.
U = UB - (Rline + jXline) . I
L
EQUATION2080 V2 EN
where:
U , I = Re(I ) + jlm(I
L L L L
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
Verifying settings by secondary injection
(displayed as a measured value on the
L
= I1Base), in accordance with
L
L
) are complex phase quantities
× + ×
, ,
Section 13
(Equation 18)
(Equation 19)
187