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Apparatus Section 11: Synchronous Machines: Unbalancing of Polyphase Synchronous Machines

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FieldValue
SourceTheoretical Elements of Electrical Engineering
Year1915
Section IDtheoretical-elements-electrical-engineering-section-32
Locationlines 9719-9748
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Word Count228
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XI. Unbalancing of Polyphase Synchronous Machines 23. The preceding discussion applies to polyphase as well as single-phase machines. In polyphase machines the nominal generated e.m.fs. or nominal counter-generated e.m.fs. are neces- sarily the same in all phases (or bear a constant relation to each other). Thus in a polyphase generator, if the current or the SYNCHRONOUS MACHINES 151 phase relation of the current is different in the different branches, the terminal voltage must become different also, more or less. This is called the unbalancing of the polyphase generator. It is due to different load or load of different inductance factor in the different branches. Inversely, in a polyphase synchronous motor, if the terminal voltages of the different branches are unequal, due to an unbal- ancing of the polyphase circuit, the synchronous motor takes more current

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