Delta C1000 Operation And Installation Manual page 85

Appendix C: Delta MV Transformer and Auxiliary Power transformer Application Note
C. The Auxiliary Power powered by external source with a transformer.
The auxiliary power is powered by the output of inverter with 3P3W in default to saving
the requirement of extra power source on the field.
If ones do require powering the auxiliary power by the farm-side grid, the three phase
transformer should be applied with output line to line voltage within 216V ~ 438V and
power rating should be larger than 2.8kVA.
The output of transformer can be either Star or Delta connection for the auxiliary power.
If the Neutral point of Star connection is brought out, to leave it unconnected.
Inverter
+
-
Aux power
Inverter
+
-
Aux power
85
MV Transformer
3P3W
MV Transformer
3P3W
LV Grid Source
3P3W △216Vac~△438Vac