Voltech AT360, User Manual

Page: 406 / 470

T
ESTS AND
T
EST
C
ONDITIONS
P
AGE
7-108 V
OLTECH
AT
I
U
SER
M
ANUAL
7.1.27 PHAS – I
NTERWINDING
P
HASE
A
NGLE
Measurement
Range
Test
Voltage
Test
Frequency
Basic
Accuracy
-360
°
to +360
°
1mV to 5V 20Hz to 3MHz 0.05
°
When the AC voltage across one winding is compared to the voltage
across another, they may be different in amplitude and phase.
Where the turns ratio or open circuit voltage tests measure the amplitude
of the voltages, the PHAS test measures the phase difference between
the two voltage waveforms.
Where Used
The interwinding phase angle test is most often used on measuring and other
signal transformers where the phase displacement of signals is important to
the operation of the complete circuit or product.
The test determines the angle, measured in degrees, between the voltage
signals across two different windings. This is different to the polarity test