Leakage Reactance Test Procedures
3-16 72A-2243-01 Rev. B 9/04
September 17, 2004
•In the Base Voltamperes (MVA) and Base Volts (kV), enter the values
given on the nameplate.
•In the Nameplate % Impedance, enter the nameplate impedance.
• Unless this is the first test, enter the values obtained for the %
impedance and % reactance for each phase of the first (benchmark)
per-phase tests. If this is the first test, and you have no benchmark
data, enter the transformer nameplate impedance in both of these
fields, and the results from this first per-phase test will be entered as
the benchmark values for all future tests.
• If using DTA, the benchmark data is entered on the Leakage
Reactance test screen, with values for % Impedance and % Reactance
entered on the screen corresponding to the tab selected below.
6. There will be one nameplate value and one benchmark value per
single-phase transformer. The M4000 allows three single-phase tests to be
made on a single screen, in the event the user is testing a bank of three
single-phase transformers. When Winding Configuration is selected as
Single, the letter next to the Serial Number field indicates which single
phase transformer is being identified. Click the button to advance the
display to the next serial number.
7. The three-phase equivalent test will have one nameplate value and one
benchmark value.
8. The per-phase-delta (or wye) will both have one nameplate value and three
benchmark values, one per phase.
NOTE For all but the single phase transformers, base voltage must be
line-to-line; for single phase transformers, it must be line-to-ground.
9. Enter information in the Administration and Test Conditions buttons as
needed.
10. Depending on the selected Test Configuration, there may be up to three
rows (phases) where test data will be entered. Make sure the desired row
in the Phase column is filled in before testing, in order to identify the
terminals energized and the terminals shorted for the record. When
starting a test, you will be asked which row (phase) you are testing.
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