Transformer Testing
AVTMTO210 Rev 7 Sept 2013
31
Testing a Three-Phase Transformer
The following details the different methods to be used in testing three-phase
transformers. The measurements taken will be for one or two winding(s) at a
time. Connection diagrams (Figures 4 thru 7) are to be used in conjunction with
procedure "Single-Phase Transformer Test". The only changes will be placement
of leads.
NOTE: When testing Primary and Secondary windings simultaneously, always
try and keep the polarization of the transformer the same for improved
transformer charge time. See Table 1.
PROCEDURE:
1. Three-Phase Wye Configured Winding with Neutral
Figure 4: Reading obtained is per phase, Resistance of A-N Winding
Use the above diagram in conjunction with procedure "Single-Phase
Transformer Test".
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