ABB rec670 Commissioning Manual page 198

Section 11
Primary injection testing
192
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.
~
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.
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Bay control REC670 2.1 IEC
Commissioning manual