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How do electrical grids manage phase balance?
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In the US most residences are fed by single phase power, usually via a split-phase transformer. Somewhere upstream of this transformer, presumably at a distribution substation, that single phase is being drawn from a three phase transformer.
So what mechanism is used to maintain phase balance? Do you just make sure each phase supplies about the same amount of households and hope for the best or is it more complex than that?
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