SC Public Utilities Electrical Practice Questions - South Carolina Public Utilities - Electrical Contractor Examination Exam

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A delta-wye transformer bank is commonly used to serve 480Y/277 V three-phase loads from a delta primary feeder because the wye secondary:

Eliminates the need for a grounded conductor on the secondary Provides a grounded-wye neutral and 277 V line-to-neutral for mixed loads Forces all secondary loads to be ungrounded corner-grounded delta Makes primary and secondary zero-sequence currents identical

Correct Answer:

Provides a grounded-wye neutral and 277 V line-to-neutral for mixed loads

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