CPC 100
V 3.20
Transformer - 2
Transformer
The
Settings
page of the
TRRatio
test card offers an offline
Auto-tap
fill function. It
automatically fills in the nominal ratio table of the
TRRatio
test card for symmetric tap changers.
The total number of taps minus the middle positions defines the number of taps above and
below the middle position(s). To determine the voltage for each tap position, the nominal ratio
of the middle position(s) and the deviation percentage are needed and the
HV tap changer
check box needs to be activated if applicable.
The following table shows the
V prim
and
V sec
settings on the
TRRatio
test card for different
transformer’s winding connections.
Note:
The table is valid for manual wiring and in connection with the
CP SB1
.
In the Transformer high-voltage side column, + means that the terminals in the
CP SB1
are
short circuited.
Measurement starts at the lowest or highest
position
Time needed to switch from one tap to the
next
Select for
the fully
automatic
and
extended
manual
mode
Number of taps with
the specified
nominal ratio in the
middle of the
symmetrical tap
scheme
Voltage difference
between positions
Activate if tap
changer is on high-
voltage side
IEC
60076
vector
group
Winding connection
Mea-
sure-
ment
Transformer
high-voltage side
Transformer
low-voltage side
Mea-
sured
turn ratio
HV / H
LV /X
Dd0
A
U-V / H1-H2
u-v / X1-X2
1
B
V-W / H2-H3
v-w / X2-X3
C
W-U / H3-H1
w-u / X3-X1
Yy0
A
U-V / H1-H2
u-v / X1-X2
1
B
V-W / H2-H3
v-w / X2-X3
C
W-U / H3-H1
w-u / X3-X1
Dz0
A
U-V / H1-H2
u-v / X1-X2
1
B
V-W / H2-H3
v-w / X2-X3
C
W-U / H3-H1
w-u / X3-X1
U/H1 W/H3
V/H2
u/X1 w/X3
v/X2
U/H1 W/H3
V/H2
u/X1
w/X3
v/X2
U/H1 W/H3
V/H2
u/X1 w/X3
v/X2
Settings Page
Automatic Tap Fill
TRRatio (per Tap)
