The Geometry Of Twisted Wire Bundles

Focus:

Windings having bundled strands are usually twisted to minimize the interbundle proximity effect. Twisting, however, affects both the bundle diameter and the winding length. This in turn affects window utilization of transformers for a given core as twisting affects packing factor and thus current density. This article derives design formulas for both bundle radius and winding length and for calculating the bundle skin effect. The effects of bundling (including sub-bundling) on proximity and skin effects are also discussed. Understanding the impact of bundle twisting on all of these factors will enable better optimization of transformer power transfer when twisting is applied in winding designs.

What you’ll learn:

• How to calculate bundle radius/diameter and winding length that results from twisting of wire bundles for transformer windings
• How to calculate the bundle skin effect when twisted wire bundles are used as transformer windings

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Author & Publication:

Dennis Feucht, Innovatia Laboratories, Cayo, Belize, How2Power Today, Jul 16 2018

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