What factors determine how the secondary of a transformer bank is connected?

The connection of the secondary side of a transformer bank primarily depends on customer demands because it relates directly to the specific power and voltage requirements of the loads that will be served. Each customer or group of customers may have varying needs in terms of voltage levels and phases, which influences how transformers must be configured to deliver the requisite power efficiently.

For example, if a customer requires a certain voltage level for their equipment or has specific three-phase power needs, the transformer's secondary must be connected in a way that meets those demands. This often involves decisions like whether to connect in a delta or wye configuration, which affects the voltage provided and the system's performance.

While voltage ratings, wire gauge, and phase rotation are important considerations in transformer operation and design, they are typically more about ensuring the system operates safely and efficiently rather than directly determining how the secondary connection is made in response to customer needs.