TRANSFORMER TESTS VOLTECH AT3600 USER MANUAL
PAGE 7.1.42. VPN 98 - 024 TESTS AND TEST CONDITIONS
1.23. PHAS – INTERWINDING PHASE TEST
WHERE USED
This test is useful for most types of
transformer, although unusual with line
frequency transformers and tests for the
phase angle between windings. It is most
useful for determining the phase effect of
audio and telecommunications transformers
when placed in a transmission line.
MEASUREMENT CONDITIONS
If you are programming the test from a computer that is connected to the auxiliary
port of the tester, you may enter the test conditions in the following way. Select the
test terminals, enter the test frequency, click on the measure button and the editor will
select the correct voltage and display the measured phase angle. You can then use
this measured angle as a basis for setting your limits.
If your computer is not connected to the tester, you can choose the test voltage from
the following table.
N.B. When selecting your energised winding, check that your transformer
does not have a large step-up turns ratio between this winding and any
other windings as this may cause high voltages to be present during the
test. Energise the winding with the most turns if this is the case.
Impedance of Energised
Winding
Test Voltage
1MΩ → 100kΩ
5V
100kΩ → 10k
5V
10kΩ → 1k
5V
1kΩ → 100
3V
100Ω → 10
0.5V
10Ω → 1Ω
100mV
1Ω → 100m
10mV
100mΩ → 10m
1mV
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