Transformer Engineering, 2nd Edition

5

Stray Losses in Structural Components

The previous chapter covered the theory and fundamentals of eddy currents. It also covered in detail the estimation and reduction of stray losses in windings, viz., the eddy loss and the circulating current loss. This chapter covers estimation of remaining stray losses, which predominantly consist of stray losses in structural components. Various countermeasures for the reduction of these stray losses and elimination of hot spots are discussed.

The stray loss problem becomes increasingly important with growing transformer ratings. Ratings of generator transformers and interconnecting auto-transformers are steadily increasing over last few decades. Stray losses of such large units can be appreciably high, ...