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- W2045128906 abstract "Circulating currents are produced within stator windings of Roebel bars by endregion leakage fields, causing voltages to arise between the strands or subconductors. A method for calculating the endregion fields arising from both rotor and stator is given, and values of voltage for a simplified bar representation are obtained. The impedance of a Roebel bar to a circulating current is discussed, and values of circulating current are obtained for one machine. It is shown that the circulating currents in each bar are substantially independent of those in other bars, but that the reactance within each bar is of the same order as the resistance. The circulating-current loss is a small component of the total loss in the machine considered (10% of the stator I2R loss), but varies with the load and the power factor. Its significance is that two-thirds of it occurs in the top layer of the stator winding, increasing the temperature rise there by 13%. The theoretical analysis from which the above conclusions are drawn is confirmed by search-coil measuremnets which show an average agreement within 18%." @default.
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- W2045128906 date "1971-01-01" @default.
- W2045128906 modified "2023-09-24" @default.
- W2045128906 title "Circulating-current loss within Roebel-bar stator windings in hydroelectric alternators" @default.
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- W2045128906 doi "https://doi.org/10.1049/piee.1971.0124" @default.
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