Leakage Reactance Test Procedures
3-14 72A-2243-01 Rev. B 9/04
September 17, 2004
4. Connect one end of the current leads across a phase of a winding (such as
H
3
–H
1
), and the other end to the M4130 Leakage Reactance Module Input
Terminals.
5. Connect one end of the voltage leads across the same phase as the current
leads. Connect the other end to the M4130 Leakage Reactance Module
Voltage Input Terminals, observing the color coding of the leads. THE
CURRENT AND VOLTAGE LEADS MUST BE CONNECTED IN
SUCH A WAY THAT THE CURRENT LEAD AND THE VOLTAGE
LEAD CONNECTED TO THEIR RESPECTIVE BLACK COLORED
TERMINALS ON THE M4130 LEAKAGE REACTANCE MODULE
SHOULD BOTH BE CONNECTED TO THE SAME BUSHING ON
THE TRANSFORMER UNDER TEST. ALSO, THE CURRENT LEAD
CONNECTED TO THE RED TERMINAL AND THE VOLTAGE
LEAD CONNECTED TO THE WHITE TERMINAL ON THE M4130
LEAKAGE REACTANCE MODULE SHOULD BOTH BE
CONNECTED TO THE BUSHING ON THE OTHER END OF THE
TRANSFORMER WINDING UNDER TEST.
6. If performing a Per-Phase test
, jumper only the phase of the opposite
winding corresponding to the phase under test, as determined by the
winding vector diagram on the transformer nameplate, except in the case
of a zig-zag winding (see Figure 3.5 M4130 Setup (a)). If performing a
Three-Phase Equivalent test, jumper all three line terminals of the
opposite winding.
7. Connect the Red and Blue leads between the M4100 and the M4130
Leakage Reactance Module, observing the color coding.
8. Connect the M4200c and the M4100 to your AC power source.
Setup for a Transformer with Three or More Windings
1. Follow the instructions for a two winding transformer
2. Leakage Reactance should be measured between all pairs of windings
(H-X, H-Y, X-Y, etc)
3. The windings not under test must be left floating
Running a Test
1. Once the connections are made, turn on the test set.
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