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Apparatus Subsection 93: Synchronous Converters: Three-wire Direct-current Generator

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FieldValue
SourceTheoretical Elements of Electrical Engineering
Year1915
Section IDtheoretical-elements-electrical-engineering-section-93
Locationlines 16618-16726
Statuscandidate
Word Count722
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A. THREE-WIRE DIRECT-CURRENT GENERATOR 108. In such machines, either only one compensator or auto- transformer is used for deriving the neutral, as shown diagram- matically in Fig. 146, or two autotransformers in quadrature, as shown in Fig. 148, but rarely more. FIG. 148. — Three-wire machine with two compensators. As the efficiency of conversion of a direct-current converter with two autotransformers in quadrature (Fig. 148) is higher than that of a direct-current converter with single autotransformer (Fig. 146), it is preferable to use two (or even more) autotrans- formers where a large amount of power is to be converted, that is, where a very great unbalancing between the two sides of the three-wire system may occur, or one side may be practically unloaded while the other is overloaded. Where, however, the load is fairly distributed
... e- ceives is 2 e, and its effective voltage therefore e \/2. As the neutral current iQ divides when entering the autotransformer, the current in the compensating winding is -^ (neglecting the small z exciting current), and the volt-ampere capacity of the autotrans- former thus is and PQ _ 1 io P ~ 2 V2 i = 0.354 *°- x Even with the neutral current equal to the current in the out- side conductor, or the one side of the system fully loaded, the other not loaded ...
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