AJ0383DE ZP-AJ01E TRAX
41
5 OPERATING INSTRUCTIONS
5.9 Short-circuit impedance
/ Leakage reactance
Important
Read and comply with the safety instruc-
tions “2 Safety” on page 8.
Always comply with local safety regula-
tions.
1] Press
TRAX Short-circuit Impedance/Leakage Reactance app
is intended for impedance measurements on the HV
side of the transformer with the LV side shorted.
Without configuration you need to decide how to
connect and what to measure. With configuration,
the app supports short-circuit impedance/leakage
reactance measurement phase-by phase or by using
three-phase equivalent model.
Note Not all transformer configurations are sup-
ported in this app. Three phase equivalent
impedance analysis is not supported for zig-
zag configurations. Per phase measurements
are not supported for configurations without
HV neutral (Dx, Yx and Zx). For measuring
these configurations on an individual basis
with custom connections and shorts, please
use Manual Control.
Settings
1] Press
Select the calculated parameters to be displayed in
results table. For description of the parameters see
“Calculated parameters” on page 24.
Xs Variation Variation between windings
Default 3%
Impedance
Error
Deviation from nameplate imped-
ance
Default 3%
Transformer configuration
1] Configuration is selected by entering the
corresponding transformer vector diagram
via keyboard or selecting in the matrix (see
winding resistance app).
If no configuration is entered the test will
automatically be defined as a manual test on
a 2-winding transformer.
Note It is possible to mix configured and manual
tests in the same session but NOT two tests
with different configurations.
2] Define the winding pair to test.
If impedance is to be calculated (3-phase
equivalent), enter MVA , voltage and imped-
ance for actual tap to test). If the configu-
ration is a three-winding transformer, select
which winding pair to define and/or test.
A] If “Impedance” is not selected, the test
will be “per phase”. Please note that the
connections and shorts are different be-
tween “per phase” and “3-phase equiva-
lent”.
B] If the activated winding pair has
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