M
AVTMDELTA4000-EN Rev 6 April 2018
30
Three winding transformer test
When UST-R is selected for a CHL test, the HV output terminal is to be
connected to the primary winding, the red terminal to the secondary winding and
the blue terminal to the tertiary winding. The blue terminal is in this case
grounded/guarded.
For CHT measurement UST-B should be selected. The blue terminal is now
measured and the red is grounded. The time saving benefit is that the
transformer can be tested without the need for reconnections.
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