Building factor

Stan Zurek, Building factor, Encyclopedia Magnetica,
https://www.e-magnetica.pl/doku.php/building_factor

Building factor (BF) - a factor expressing the ratio of power loss dissipated in the magnetic core of a fully built transformer the the power loss of the raw electrical steel specified at the same operating point.

Building factor BF
$$BF = \frac{P_{core}}{P_{steel}}$$	(unitless)
where: $P_{core}$ - total core loss (W), $P_{steel}$ - total loss (W) of electrical steel loss, calculated as the specific power loss $P$ (W/kg) multiplied by the weight of the core in $w$ (kg), so that $P_{steel} = P·w$ (W)

A typical value of BF = 1.15 can be obtained for a well designed transformer made of grain-oriented electrical steel.¹⁾ Its value can vary depending on the configuration of the magnetic core, mechanical stresses added during assembly and steel cutting, etc.²⁾³⁾

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References

^1),
2) Martin J. Heathcote, The J & P Transformer Book: A Practical Technology of the Power Transformer, Newnes, 1998, ISBN 0750611588, p. 109

³⁾ Anthony Moses, Philip Anderson, Keith Jenkins, Hugh Stanbury, Electrical Steels, Volume 1: Fundamentals and basic concepts, IET, 2019, ISBN 978-1-78561-970-0

Core losses, Building factor, Transformers, Counter

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Building factor

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References