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

question 14

Multiple Choice

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

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Definitions:

Cooling

The process of removing heat from an object or space, often to maintain a desired temperature.

Phase Current

The electric current flowing through one phase of a multi-phase system, like in three-phase electrical systems.

Resistive Load

A type of electrical load in which the current flowing through it is directly proportional to the voltage across it, in accordance with Ohm's law.

Turns Ratio

The proportion between the turns in the primary coil compared to the turns in the secondary coil of a transformer.