What is Transformer Banking?
Single Three Phase Transformer Definition
A single three-phase transformer is a single unit that manages three-phase electrical power, costing less and taking up less space than multiple single-phase transformers.

Bank of Three Single Phase Transformers
This setup uses three single-phase transformers together, offering easier transportation and operational flexibility if one transformer fails.
Transformer Banking
The practice of using multiple transformers together to manage three-phase power, offering advantages like cost-effectiveness and ease of maintenance.
Connection Methods
Star-Star Transformer



Delta-Delta Transformer

Star-Delta Transformer


Delta-Star Transformer


Economic Considerations
Star-delta connections are economical for step-down purposes, while delta-star connections are economical for step-up purposes due to insulation cost and potential stress differences.