ABB TDO 6 - 12 Connections of Voltage Transformers - Examples

14 Instruction manual
12. Connections of voltage transformers - examples
Connection name Wiring diagram Application
With one
double-pole transformer
Line voltage measurement.
Both poles of the transformer have to be fully
insulated.
With one
single-pole transformer
Line to ground voltage measurement.
One pole of the transformer should be fully
insulated.
Star connection with
broken delta system
Line to ground voltage and residual voltage
measurement.
One pole of the transformer should be insulated.
Star connection
Line to line voltage measurement.
Connection may have an broken delta system for
residual voltage measurement.
One pole of the transformer should be insulated.