VOLTECH AT3600 USER MANUAL TRANSFORMER TESTS
TESTS AND TEST CONDITIONS VPN 98 - 024 PAGE 7.1.41.
1.22. ANGL – IMPEDANCE PHASE ANGLE
WHERE USED
The impedance phase angle test measures the
angle ∅ 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
5V -
100kΩ → 10k
5V
30µA
10kΩ → 1k
5V
300µA
1kΩ → 100
3V 3mA
100Ω → 10
0.5V 10mA
10Ω → 1
100mV 50mA
1Ω → 100m
10mV 50mA
100mΩ → 10m
1mV 50mA
10mΩ → 1m
- 50mA
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