Vanguard Tri-Phase User Manual
Page 54
TRI-PHASE OPERATING™ INSTRUCTIONS
54
Delta-To-Wye (Dyn) Transformer Test Column Format Printou
The delta-wye test results printout is explained below for Figure 36.0.
1.
Test record time and date is printed at the top of the printout.
2.
Test voltage is 40 volts at 60 Hz for this test. Refer to paragraph 19.0 for more details
about test voltages and frequencies.
3.
Type of transformer under test is Delta to Wye with X0 available (Dyn1).
4.
Transformer configuration diagram.
5.
H tap voltage is 12,000 volts.
6.
X tap voltage is 208 volts.
7.
Three-Phase measured ratio, excitation current, phase angle, % Diff.
A phase: Ratio=57.757, Ext Current= 2.3mA, 30.01 degrees, % Diff= 0.11
B phase: Ratio=57.754, Ext Current= 2.4mA, 150.00 degrees, % Diff= 0.11
C phase: Ratio=57.741, Ext Current= 3.4mA, 270.01 degrees, % Diff= 0.08
8.
Single Phase measured ratio, excitation current, phase angle, % Diff.
A phase: Ratio=100.06, Ext Current= 2.4mA, 0.11 degrees, % Diff= 0.14
B phase: Ratio=100.02, Ext Current= 1.9mA, 0.10 degrees, % Diff= 0.09
C phase: Ratio=100.02, Ext Current= 2.6mA, 0.09 degrees, % Diff= 0.09
9.
Winding polarity is shown as “+” or in phase.