7.1.22 ANGL - Impedance Phase Angle
WHERE USED
The impedance phase angle test measures the angle Φ of the impedance vector Z, as shown in the phasor diagram. It represents the phase difference between the fundamental current flowing through a winding and the fundamental voltage across it. This test is normally used for audio and telecommunication transformers along with the Z test to check the complex impedance presented to the transformers input and output.
MEASUREMENT CONDITIONS
An AC voltage is applied across the winding under test, the complex impedance is determined from measurement of the test voltage and current flowing.
To set the test voltage or current you will need to know the expected impedance of the winding at the test frequency. You can measure this using the ‘Z’ (Impedance) test.
Select the test voltage or current from the table below; find the correct impedance range for your winding and read off the test voltage or current.
| Impedance Range |
Test Voltage |
Test Current |
1MΩ → 100kΩ
100kΩ → 10kΩ
10kΩ → 1kΩ
1kΩ → 100Ω
100Ω → 10Ω
10Ω → 1Ω
1Ω → 100mΩ
100mΩ → 10mΩ
10mΩ → 1mΩ |
5V
5V
5V
3V
0.5V
100mV
10mV
1mV
- |
-
30μA
300μA
3mA
10mA
50mA
50mA
50mA
50mA |