2.22 PHAS - Inter-winding 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. Energize the winding with the most turns if this is the case.
| Impedance of Energized Winding |
Test Voltage |
1MO → 100kO
100kO → 10kO
10kO → 1kO
1kO → 100O
100O → 10O
10O → 1O
1O →
100mO → 10mO |
5V
5V
5V
3V
0.5V
100mV
10mV
1mV |