M
AVTMTTR25 Rev C April 2008
16
Three-Phase, Two-Winding Transformers
Perform the following setup procedure for three-phase, two-winding transformers:
1. Connect the test cables to the test set.
2. Connect the clips marked H1 and H2 of the test lead to the phase being tested
(high-voltage winding) terminals of the transformer under test.
3. Connect the clips marked X1 and X2 of the test lead to the phase being tested
(low-voltage winding) terminals of the transformer under test.
F
WARNING
Never interchange connections between the high- and
low-voltage transformer terminals. Failure to observe
proper connections will result in a safety hazard and
may result in damage to the test set or transformer.
The unused H0 and X0 terminals of the transformer should be kept clear of
ground and personnel because they could become energized during the test.
With wye connected windings, a neutral connection is normally available.
Note: According to Australian standard, wye and delta transformer
winding connections have a numerical suffix of 1 and 2. The
zigzag transformers have a numerical suffix of 4. See Table
C-4 in Appendix C.
Three-Phase, Three-Winding Transformers
This type of transformers has primary, secondary and tertiary windings. Primary
and secondary windings are tested as a regular three-phase, two-winding
transformer. To test tertiary winding, perform the following setup procedure:
1. Connect the test cables to the test set.
2. Connect the clips marked H1 and H2 of the test lead to the phase being tested
(high-voltage winding) terminals of the transformer under test.
3. Connect the clips marked X1 and X2 of the test lead to the corresponding
tertiary phase being tested (low-voltage winding) terminals (Y1 and Y2) of the
transformer under test.
