CPC 100 V1.41
6 - 10
Measurements
The TRRatio test card displays the measurement results in two display fields
and a table:
Figure 7:
Multiple measurement
results, forexample from
a power transformer
ratio tap changer test
Iprim A primary current from 2kV AC output, measured by CPC 100
internally.
If the focus is on the table, scrolling through the lines will
change this display accordingly, depending on the selected
line.
° phase angle of primary current relative to Vprim nominal
Tap: (in table) displays the transformer tap number for the measurements in
the respective line of the table. This tap number is specified in
the data entry field "Tap:" above the table.
Vprim actual voltage injected from AC OUTPUT into the
transformer’s primary side
Vsec V secondary voltage of power transformer measured at V1 AC
° phase angle of secondary voltage relative to Vprim nominal
Note: Even on transformers such as Yd5, only phase angles like 0°
or 180° can be found using a single phase test set because a
transformer can change the phase angle only by "mixing"
different phases.
Ratio :1 calculated ratio value from Vprim act / Vsec act
% deviation of actual ratio from nominal ratio in %. Formula:
((Kn
1
x Vsec - Vprim) / Vprim
2
) x 100%
here (first line of table):
((110000V / (
√3 x 10000) x 314.96V -2000V) / 2000V) x 100%
=+0.013%
1. Kn = rated transformation value, here: 110000V / (3 x 10000)
2. Vprim and Vsec can be set individually for each measurement.
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