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6.3 Ratio Test
6.3.1 Method 1 – Concurrent
Connections for the test set:
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 (95-265
V50/60 Hz).
2. Connect the ground wing nut to a suitable ground.
3. On test lead set labeled CT X/S connect the high voltage connector color coded green to the MVCT
high voltage connector that is color coded green and labeled SOURCE Voltage. Use the red
alignment marks on the 2 connectors to properly align them before connecting.
4. On test lead set labeled CT H/P Connect the high voltage connector color coded blue to the MVCT
high voltage connector that is color coded blue and labeled MEASUREMEMT. Use the red alignment
mark on the 2 connectors to properly align them before connecting
5. On test lead set labeled CT X/S connect the test lead binding posts X1 X2, X3, X4 and XN to
secondary of the current transformer X1, X2, X3, X4 and X5 (if less than 5 taps are available on the
CT, then connect the test set secondary output binding posts X1, X2… to the correlating secondary
of the current transformer with the EXCEPTION of connecting the test set secondary output binding
Xn to the most external secondary of the current transformer. For Example on a 3 Tap CT Connect
X1(test set) to X1(CT), X2( test set ) to X2 ( CT ), and Xn (test set ) to X3 ( CT)
6. On test lead set labeled CT H/P connect the test lead primary binding posts H1 and H2 to CT primary
bushings H1 and H2.Observe the polarity marks on the CT (H1 on the test set is polarity terminal).
7. Turn Power ON/OFF switch to ON
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.
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