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POTIER REACTANCE is a somewhat fictitious reactance, because it is a combination of reactance, change of saturation, and change of flux form. Nevertheless, it is sometimes a rather useful fictions-cause it can be easily tested, and because it can be used to obtain full load field currents of synchronous machines when only the no-load saturation curve is available. It is also useful for determining effects of saturation on stability.
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Sterling Beckwith (1937) studied this question.
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