28 TRAX ZP-AJ01E AJ0383DE
5 OPERATING INSTRUCTIONS
but for higher accuracy on low inductances a
separate voltage measurement using Ch 1 is
recommended).
4] Press and select e.g. Inductance, Im-
pedance, Power factor or other parameters
to get appropriate data from the test.
5] Connect generator leads and voltage sense
leads to 0-250V A output and Ch1 voltage
input to one winding of the transformer.
6] Connect the other two windings of the
transformer in parallel with the first winding
(e.g. for a YNyn transformer A-B-C should be
connected in parallel).
7] Press to start the generator and adjust
the voltage to get an appropriate current,
typically a few amps.
8] Wait for results to stabilize.
9] Press and read results.
Power transformer turns-ratio
measurements
1] Select 0-250 V AC generator.
2] Select Ch 1 and Ch 2 for AC voltage measure-
ments set to freq. If excitation current needs
to be recorded select Gen I measurement
channel set to Freq.
3] Press and select ratio calculation “/ “
(division) between Ch 1 and Ch 2. If phase
deviation is to be recorded select “Phase”
between Ch 1 and Ch 2.
4] Connect the generator cable to the HV wind-
ing.
5] Connect the Ch 1 voltage measurement to
the HV winding and the Ch 2 voltage meas-
urement to the LV.
Note This is a 4-wire method and the Ch 1
voltage measurement lead must NOT be
connected “outside” or in contact with
the voltage generator lead.
6] Select an appropriate test voltage for the
test object. For power transformer windings,
use 250 V for highest accuracy.
7] Wait for results to stabilize.
8] Press and read the results.
CT excitation current
1] Select 0-250 V or 0-2200 V generator pending
the expected saturation voltage of the CT.
2] Select frequency, typically 50 or 60 Hz.
3] Activate Int “Gen U”, configure it to RMV*.
4] Activate Int “Gen I” configure it to AC RMS*.
* As stated in IEC 61869-2: 2012 and IEEE C57.13
5] Connect CT terminal S2/X2 to ground. Con-
nect black generator terminal to S2/X2 and
green (250V)/red (2200V) generator terminal
to CT terminal S1/X1.
6] Make sure that one side of primary winding
P1/H1 or P2/H2 is floating (other side may be
connected to ground).
7] Set a start voltage level at about 1% of max
generator voltage, 2.5V and 22V for respec-
tive generator.
Note For very small CTs, start at minimum voltage
1 V.
8] Press to start the generating.
9] Slowly increase voltage until knee point is
reached, or until a certain current level is
achieved e.g. 500 mA.
Press data capture button to save a data
point.
Slowly decrease voltage in steps and after let
current stabilize, capture data points.
10] Press
CT ratio with voltage
Caution
Make sure that one side of primary side
winding is connected to ground at all
times. Otherwise, the measurement re-
sults will be affected and the instrument
may be damaged.
1] Select 0-250 V or 0-2200 V generator pending
the expected saturation voltage of the CT.
Select frequency, for highest accuracy 55Hz
test frequency is recommended.
2] Activate Int Gen U, configure it to Freq.
If excitation current is of interest, also acti-
vate Int Gen I and configure it to AC RMS.
3] Activate Channel Ch 1, configure it to Volt-
age (V) and Freq.
To Next Page
Loading...
Need help?
General
