This lesson provides a basic understanding of the key principles in thermal design for power transformers. We will cover the main heat sources within a transformer, including winding and core losses, as well as additional losses from stray flux. The three modes of heat transfer – conduction, convection, and radiation – will be explained in the context of how heat is dissipated from the transformer. Various cooling methods used in transformers will be discussed, along with the terminology used to describe the thermal image. Determining the winding hotspot temperature is critical, and we will explore both estimation models and direct measurement techniques. Temperature rise limits based on normal service conditions will also be reviewed. By the end of this lesson, you will have a solid foundation in the fundamentals of thermal design for reliable transformer operation.
The content of this lesson is fully vendor agnostic but it is sponsored by SGB Smit.
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