Connecting to the Transformer
AVTMTTR330 Rev 3 March 2010
19
respect to power transformer entrance bushing and that connection polarities
are correct.
Figure 4-7. Setup for Testing BCT Mounted on Single-Phase Two-Winding Transformer
BCTs Mounted on Three-Phase Transformers
A turn-ratio test can be performed on all three BCTs using a single setup. Figure
4-8 shows how (to make the proper connections) when the BCTs are mounted
on a typical delta winding and Figure 4-9 shows how when mounted on a typical
wye winding.
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.
Short-circuit all windings on the opposite voltage side of the power
transformer core using jumper leads.
4.
Check to make sure that all BCTs are mounted with proper polarity with
respect to the power transformer entrance bushing. Ensure that all
connection polarities are correct. Make connections as shown in Figure 4-8
