Large three phase power transformers are commonly referred to as what?

Large three-phase power transformers are commonly referred to as transformer banks. This terminology is used because a transformer bank consists of multiple transformers that are interconnected to supply three-phase power effectively. Such configurations enable better performance in power distribution and increase the reliability of the power supply.

Transformer banks can efficiently handle the varying load demands and improve the stability of the electrical system. By grouping individual transformers into a bank, they also provide redundancy. If one transformer fails or needs maintenance, the remaining transformers can continue to provide power, ensuring that the system remains operational.

The use of the term "bank" illustrates this collective approach to managing multiple transformers, as opposed to a singular or modular reference that the other options suggest.