M4110 Leakage Reactance Interface User Guide
72A-2243-01 Rev. B 9/04 3-5
September 17, 2004
Three-phase Equivalent Test
One test is performed on each phase, by connecting the voltage source and
sense leads from the Leakage Reactance Interface to each pair of line
terminals. All three line terminals on the opposite winding are connected
together with jumpers, as shown on Figure 3.4 M4110 Setup (b) (if using the
M4110), and Figure 3.6 M4130 Setup (b) (if using the M4130).
Per-phase Test
One test is performed on each phase, by connecting the voltage (source and
sense) leads from the Leakage Reactance Interface to a line and the neutral
terminals on wye and zig/zag windings or to a pair of line terminals on a delta
winding. The terminals on the opposite winding should be short-circuited, as
shown in Figure 3.3 M4110 Setup (a) (if using the M4110), and Figure 3.5
M4130 Setup (a) (if using the M4130).
NOTE For the Per-Phase tests, use the vector diagram on the transformer
nameplate to assure that the phase being short-circuited corresponds to
the phase being energized. The examples in the above-mentioned figures
may not always correspond to the vector diagrams representing your
transformer.
Test Procedures for a Two-winding Single-phase Unit
The test connections for a single-phase unit are shown in Figure 3.3 M4110
Setup (a) or Figure 3.4 M4110 Setup (b) (if using the M4110), and Figure 3.5
M4130 Setup (a) or Figure 3.6 M4130 Setup (b) (if using the M4130).
CAUTION Be aware of the transformer turns ratio, and the high currents that may
result on the short-circuited winding. Be sure the jumper cables are rated
for that current!
Test Procedures for a Multi-winding Unit
In a multi-winding (more than two windings) unit, the leakage reactance
associated with each pair of windings should be tested. Pick two windings
between which you wish to measure the Leakage Reactance, and (after
entering the nameplate data corresponding to that winding pair) energize the
higher-voltage one while shorting the lower-voltage one in accordance with
the connection instructions. The line terminals of the other windings should be
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