Omicron CPC 100 - Page 169

Transformer
6 - 5
Figure 4:
Setup for a power
transformer ratio tap
changer test
Table 1 shows the Vprim and Vsec settings on the TRRatio test card for different
connections of the transformer under test.
Table 1:
TRRatio test card
settings for different
transformer’s windings
connections
IEC 60076
vector
group
Winding Connection to CPC 100 TRRatio
settings
HV/H LV/X 2kV output V1 AC input
red black red black Vprim Vsec
Dd0 U/H1 V/H2 u/X1 v/X2
V/H2 W/H3 v/X2 w/X3
W/H3 U/H1 w/X3 u/X1
Yy0 U/H1 V/H2 u/X1 v/X2
V/H2 W/H3 v/X2 w/X3
W/H3 U/H1 w/X3 u/X1
Dz0 U/H1 V/H2 u/X1 v/X2
V/H2 W/H3 v/X2 w/X3
W/H3 U/H1 w/X3 u/X1
UW
V
uw
v
UW
V
uw
v
U
V
W
u
v
w