TRANSFORMER TESTS VOLTECH AT3600 USER MANUAL
PAGE 7.1.26. VPN 98 - 024 TESTS AND TEST CONDITIONS
1.13. Z, ZB – IMPEDANCE, IMPEDANCE WITH BIAS
WHERE USED
The impedance test measures the impedance of a transformer winding by applying a
specified voltage and frequency and by measuring the current that flows, calculating
the magnitude of the complex impedance.
MEASUREMENT CONDITIONS
The load resistor is assumed to be on the fixture, but not shown on the Editor
schematic. It is switched in circuit using an OUT test that must be inserted in the
program before the Z test. (The relay patterns associated with inserting and removing
fixture resistors have deliberately not been included in the Z test dialogue for two
reasons: a) it would make the dialogue too complicated, and b) it is not always
necessary - e.g. in the case of a fixture where the resistor is permanently fitted in
circuit).
The test voltage is applied to the input winding, and the voltage and current
measured. From the measured results the impedance is calculated.
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