IEC13000251-1-en.vsd
3.
In this view, check the following settings:
3.1. Check that
Control Mode
is set to
Manual
.
3.2. Operate the tap changer so that the
Load Voltage
corresponds to the
Voltage Set Point
.
3.3. Check that neither the Raise or the Lower command are operating.
Voltage Deviation
should be less than 100%.
3.4. Compare the values of
Bus Voltage
and
Load Voltage
.
UL can be obtained by a vector calculation where IL is the load current and values for RL
and XL are the settings given in primary system ohms.
~
L
o
a
d
R
L
X
L
U
B
U
L
U
B
R
L
I
L
jX
L
I
L
Re
IEC06000487-2-en.vsd
For inductive load, the
Bus Voltage
should be higher than the
Load Voltage
. If not, current circuits are
incorrect and must be reversed. Incorrect current polarity may be an issue with physical wiring or the
current direction convention selected for the CT analogue input as part of the setting in the PST
setting.
12.1.2
Voltage control of Parallel Transformers
SEMOD176327-186 v5
In parallel operation, each transformer protection IED must be connected to the station
communication bus for data exchange. The following procedure assumes that the necessary pre-
configuration in the Parameter Setting tool and the Signal Matrix tool has been performed and tested
to enable data exchange between IEDs or between instances of voltage control in the same IED.
For parallel operation, it is also recommended to confirm the setting for the general parallel
arrangement of transformers in
Main menu /Settings/IED Settings /Control/
TransformerVoltageControl(90, U↕) /TR8ATCC(90, U↕||):x/ParCtrl
. General parallel arrangement
Section 12
1MRK 511 403-UEN Rev. L
Primary injection testing
208
Bay control REC670
Commissioning manual
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