18
Phase A
Phase B
Phase C
Nuetral
13
11
9
7
figure 10: Three phase 3-wire Delta.
Phase A
Phase B
Phase C
Nuetral
13
11
9
7
figure 11: Single phase 3-wire (Double Delta)
Phase A
Phase B
Phase C
Nuetral
13
11
9
7
figure 12: Single phase 2-wire (Double Delta)
4.5 Transformer Connections
The PowerWizard can monitor generator output voltages in the range of 80VAC to 600VAC. In order to monitor voltages greater
than 600 Volts, external potential transformers must be used.
note:
The PowerWizard must be programmed for the correct winding ratios when connecting external potential transformers
•
The wye configuration of external potential transformers is preferred for 4-wire wye generating set because of the greater
•
accuracy when loads are unbalanced. With the open delta configuration, some power parameters cannot be determined.
These parameters are real power phase A, B, C and power factor phase A, B, C. For maximum accuracy, the open delta
configuration of external potential transformers should be used only for 3-wire delta generating sets.
13
11
9
7
Phase A
Neutral
Phase C
Phase B
POWERWIZARD
figure 13: Wye Configuration of external Potential Transformers (PT) on the 4-wire Wye connected Generator
