M
AVTMTTR330 Rev 3 March 2010
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Figure 4-6 shows the setup for testing the taps on a multiple-tap CT.
Figure 4-6. Setup for Testing Taps on Multiple Tap CT
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:
1.
With the ON/OFF Switch in the OFF position, make the circuit
connections as described in Section 3.
2.
Connect the H and X test cables to the respective H and X receptacles of the
TTR330. Make sure that the connectors are securely fastened (using
clockwise rotation) to the receptacles.
3.
Using user supplied shorting jumper leads, short-circuit the winding on the
opposite voltage side of the power transformer core.
4.
Connect the heavy-duty clamps marked H1 and H2 of the test leads to the
respective X1 and X2 terminals of the BCT as shown in figure 4-7.
5.
Connect the heavy-duty clamp marked X1 to the power transformer terminal
on which the BCT is mounted and the X2 heavy-duty clamp 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
