When connecting three transformers for three-phase use with a delta secondary, a voltage test should be done before closing the secondary. The correct voltage reading is _____.
A) the rated secondary voltage value
B) twice the rated secondary voltage value
C) zero volts
D) the sum of the three transformer primaries

Question

Quizplus · Accepted Answer

In a delta secondary configuration, when measuring the voltage across any two points where the transformers are properly connected for three-phase use, the reading should be zero volts. This is because in a delta configuration, the phases are electrically continuous, and measuring across the same phase results in no potential difference.

When Connecting Three Transformers for Three-Phase Use with a Delta