82
Figure 56: CT Winding Results - Concurrent
Winding resistance test is used to determine if the dc resistance of the CT secondary winding is
within specification or not. A DC current is applied and voltage is measured to determine the
winding resistance for the selected tap. After measurement winding resistance is displayed in
digital format on the screen.
Note:
A CT should be demagnetized after running the winding resistance test. Run a saturation test to
demagnetize the CT at the completion of all winding resistance tests.
9.4.2 Method 2 – Non Concurrent or Testing a Single Tap
Refer to the safety instructions first before use of the equipment.
1.
Verify the Power ON/OFF switch is OFF. Power the test set from a suitable source
of power (95-125 or 195-265 V50/60 Hz).
2.
Connect the ground wing nut to a suitable ground.
3.
Connect the test set secondary output
SOURCE
binding posts
X1S
and
X5S
to the
secondary of the
current transformer on the desired tap.
WARNING
There is always the possibility of voltages being induced at the terminals of a test
specimen because of proximity to high voltage energized lines. A residual static voltage
charge may also be present at these terminals. Ground each terminal to be tested with a
safety ground stick, before making connections.
