SETUP AND CONNECTIONS
AVTMTTR310 Rev 8 May 2016
27
Bushing Current Transformer (BCT) Mounted on Single-Phase,
Two-Winding Transformer
A turn-ratio test can be performed on a BCT after it has been mounted on a
circuit breaker or power transformer entrance bushing. The test can be
performed without removal of the BCT from the equipment. Proceed as follows
and as shown in Figure 5-7.
1. Connect the wing-nut ground terminal of the test set to a low-impedance
earth ground using the 15-ft (4.6 m) ground cable supplied.
2. Use the TTR310 two or four conductor H and X test leads.
3. Short-circuit the winding on the opposite voltage side of the power
transformer core, using jumper leads.
4. Connect the heavy-duty clips marked H1 and H2 of the test leads to the
respective X1 and X2 terminals of the BCT.
5. Connect the heavy-duty clip marked X1 to the power transformer terminal
on which the BCT is mounted and the X2 heavy-duty clip to the terminal on
the opposite side of the power transformer winding (H2 side of BCT). Check
to make sure that the BCT is mounted with proper polarity with respect to
power transformer entrance bushing and that connection polarities are
correct.
Figure 5-7. Setup for Testing BCT Mounted on Single-Phase Two-Winding Transformer
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