M
AVTMTTR310 Rev 8 May 2016
28
BCTs Mounted on Three-Phase Transformers
A turn-ratio test can be performed on all three BCTs using a single setup. Figure
5-8 shows how to make the proper connections when the BCTs are mounted on
a typical delta winding and Figure 5-9 when mounted on a typical wye winding.
1. Use four conductor H and X test leads.
2. Short-circuit all windings on the opposite voltage side of the power
transformer core using jumper leads.
3. 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.
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