Richard Huber, P. Eng.
Richard Huber Engineering, Ltd.
North Vancouver, British Columbia
Canada
Technical Services Committee Member

Introduction
There are many transformers in use rated up to 10 MVA (10,000 kVA) that were originally wound using aluminum conductors. When dam­aged or when selected for rewind, the aluminum conductor is often replaced with copper conductor. This is usu­ally fairly routine when the conductor changes are undertaken within the bounds of the original transformer design. It is this type of change that will be reviewed in this article. It is not the intent to provide information here for the complete redesign of the transformer. It is important that all coil dimensions remain as close to the originals as possible.

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