Buying and operating tips—dry-type transformers

What should you consider when buying a dry-type transformers?

Know your load profile.
Every transformer’s load and no-load loss profile is different. Transformer energy losses depend heavily on precisely how you use equipment in your building. Knowing your building’s load profile will help you choose the best transformer for your facility.

What’s being powered?
The demands of the equipment powered by a transformer will greatly affect the unit’s energy efficiency. Some respond well to linear loads such as those produced by lighting and motors. Others are better suited to operating under non-linear conditions—those produced by electronic equipment and adjustable speed drives.

Understand full-load efficiency.
Do not buy a transformer based only on its ability to perform well at full loads. Since most businesses will run transformers at one-third capacity, you should consider also the transformer’s performance under part-load conditions which can be very different from its efficiency at full load.

Look at more than just temperature rise.
A transformer’s temperature rise tells only part of the unit’s energy-efficiency story. Units with low temperature rises often perform less well under no-load conditions than those with high temperature rises.

Follow these best practices for even more energy savings.

Read the owner’s manual.
It will provide tips for making sure the specific model you choose works as efficiently as possible.

Understand transformer losses.
Transformer losses are a combination of load losses and no-load losses. Often, as one type of loss is reduced, the other increases. Get to know how these losses affect usage in your operations.