Vanguard Tri-Phase - Manual (Page 57)

TRI-PHASE OPERATING™ INSTRUCTIONS
57
14.2 Delta-To-Wye Transformer Test Detail Format Printout (continued)
The same 3-phase test results are now shown in detailed format printout (Figure 37.0).
The test results printout is explained below:
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 section 11.2 for more details about
test voltages.
3. Type of transformer under test is Delta to Wye with X0 available.
4. Transformer configuration diagram (H and X).
5. Three Phase Test Results heading (numbers 6 through 29).
6 Test H1-H3 and X1-X3 heading.
7 H1-H3 tap voltage is 12,000 volts.
8 X1-X3 tap voltage is 208 volts.
9 H1-H3, X1-X3 calculated voltage ratio is 57.692.
10. H1-H3, X1-X3 measured voltage ratio is 57.755.
11. H1-H3, X1-X3 percentage error between calculated ratio and measured ratio is 0.11%.
12. Measured phase angle between H1 to X1 is 30.01 degrees.
13. H1-H3 measured excitation current is 2.3mA.
14. Test H2-H1 and X2-X1 heading.
15. H2-H1 tap voltage is 12,000 volts.
16. X2-X1 tap voltage is 208 volts.
17. H2-H1, X2-X1 calculated voltage ratio is 57.692.
18. H2-H1, X2-X1 measured voltage ratio is 57.754.
19. H2-H1, X2-X1 percentage error between calculated ratio and measured ratio is 0.11%.
20. Measured phase angle between H1 to X2 is 150.01 degrees.
21. H2-H1 measured excitation current is 2.4mA.
22. Test H3-H2 and X3-X2 heading.
23. H3-H2 tap voltage is 12,000 volts.
24. X3-X2 tap voltage is 208 volts.
25. H3-H2, X3-X2 calculated voltage ratio is 57.692.
26. H3-H2, X3-X2 measured voltage ratio is 57.741.
27. H3-H2, X3-X2 percentage error between calculated ratio and measured ratio is 0.08%.
28. Measured phase angle between H1 to X3 is 270.01 degrees.
29. H3-H2 measured excitation current is 3.4mA.