Voltage Control Of Parallel Transformers - ABB Relion 670 Series Commissioning Manual

Section 12
Primary injection testing
3. In this view, check the following settings:
3.1.
3.2.
3.3.
3.4. Compare the values of
For inductive load, the
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

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/
190
Control Mode is set to Manual .
Check that
Operate the tap changer so that the
Point .
Check that neither the Raise or the Lower command are operating.
Deviation should be less than 100%.
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.
~
Bus Voltage should be higher than the Load Voltage . If not, current
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IEC13000251-1-en.vsd
Load Voltage corresponds to the Voltage Set
R X
L
U
B
U
B
jX I
U
L L
L
Re
R I
L L
IEC06000487-2-en.vsd
1MRK 511 403-UEN E
Voltage
L
Bay control REC670
Commissioning manual
SEMOD176327-186 v4