![]() ![]() Interleaving of primary and secondary windings, or increasing separation between the conductors reduces proximity loss. In the worst case the power loss can increase faster than the effective cross-sectional area, which is a particular problem for busbars operating at very high currents (>1kA). Skin effect alone limits thickness of busbars to below 10 mm, and parallel connection of closely positioned conductors leads to significant increase in power loss. The effect is also important at power frequency (50 or 60 Hz) in thick conductors such as three-phase busbars. 4) 6)īecause of the proximity implications, the currents flowing in the same direction appear to “repel” each other ( direct proximity effect), and currents in the opposing directions are “drawn” together ( reverse proximity effect). 1) 2) 3) 4) 5) The additional power loss caused by the proximity effect is called proximity loss. ![]() Proximity effect can be several orders of magnitude greater than skin effect, and it grows exponentially with the number of layers of wire in the winding. ![]()
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