Vanguard Tri-Phase - Manual (Page 58)

TRI-PHASE OPERATING™ INSTRUCTIONS
58
14.2 Delta-To-Wye Transformer Test Detail Format Printout (continued)
30. Single Phase Test Results (numbers 31 through 54).
31. Test H1-H3 and X1-X0 heading.
32. H1-H3 tap voltage is 12,000 volts.
33. X1-X0 tap voltage is 208 volts.
34. H1-H3, X1-X0 name plate calculated voltage ratio is 99.926.
35. H1-H3, X1-X0 measured voltage ratio is 100.06.
36. H1-H3, X1-X0 percentage error between calculated ratio and measured ratio is 0.14%.
37. H1-H3, X1-X0 measured phase angle is 0.11 degrees.
38. H1-H3 measured excitation current is 2.4mA.
39. Test H2-H1 and X2-X0 heading.
40. H3-H2 tap voltage is 12,000 volts.
41. X2-X0 tap voltage is 208 volts.
42. H2-H1, X2-X0 name plate calculated voltage ratio is 99.926.
43. H2-H1, X2-X0 measured voltage ratio is 100.02.
44. H2-H1, X2-X0 percentage error between calculated ratio and measured ratio is 0.09%.
45. H2-H1, X2-X0 measured phase angle is 0.10 degrees.
46. H2-H1 measured excitation current is 1.9mA.
47. Test H3-H2 and X3-X0 heading.
48. H3-H2 tap voltage is 12,000 volts.
49. X3-X0 tap voltage is 208 volts.
50. H3-H2, X3-X0 name plate calculated voltage ratio is 99.926.
51. H3-H2, X3-X0 measured voltage ratio is 100.02.
52. H3-H2, X3-X0 percentage error between calculated ratio and measured ratio is 0.09%.
53. H3-H2, X3-X0 measured phase angle is 0.09 degrees.
54. H3-H2 measured excitation current is 2.6mA.
15.0 Auto Detect Transformer Configuration Capability
The auto detect feature of the TRI-PHASE™ enables it to detect the specific transformer
configuration. The user only has to select the general transformer configuration for test (for
examples, see figures Figure 15.0 Transformer Configuration Selection First Menu and Figure
16.0 Transformer Configuration Selection Second Menu). The TRI-PHASE™ will identify the
specific transformer configuration and run the test. The TRI-PHASE™ is capable of detecting the
vector diagrams of the following transformer types.
Delta-Delta Delta-ZigZag
Wye-Wye ZigZag-Delta
Delta-Wye ZigZag-Wye
Wye-Delta T
Type
The transformer configurations supported by TRI-PHASE™ are listed in Appendix B. Once the
correct three phase transformer configuration is identified, the TRI-PHASE™ will perform the turns
ratio test.