Three-Phase Transformers and Configurations

Front

What is the most common method utilized by utility companies for three-phase services? Options: Single-phase transformer, Interconnecting three single-phase transformers, Two-phase transformer, None of the above.

Back

Interconnecting three single-phase transformers

Front

Fill in the blank: A three-phase transformer unit is basically three single-phase transformers inside a ______.

Back

Single tank

Front

Fill in the blank: The kVA rating of the transformer is clearly printed on the ______.

Back

Front

Front

What is the responsibility of the lineworker according to the text?

Back

Confirming transformer nameplate information

Front

What is the purpose of the transformer nameplate according to the text?

Back

To indicate transformer sizes in kVA

Front

In a three-phase transformer, which coil is always positive? H-1, H-2, X-1, X-3

Back

H-1

Front

Fill in the blank: Transformers with a primary rating of 8,660 volts and below will be rated ______ polarity.

Back

Additive

Front

What is the allowable range of impedance difference between transformers according to industry standards?

Back

7.5%

Front

Which type of transformer connection always has a positive terminal connected to a negative terminal? Options: Delta, Wye, Zigzag, Star

Back

Delta

Front

Fill in the blank: A reversed polarity on one transformer of a three-phase bank will result in an extremely ______ current flow.

Back

High