Connections Of Voltage Transformers - Examples - ABB TDO 6 Instructions For Installation, Use And Maintenance Manual

12. Connections of voltage transformers - examples

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