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Apparatus Subsection 94: Synchronous Converters: Thbee-wire Converter

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FieldValue
SourceTheoretical Elements of Electrical Engineering
Year1915
Section IDtheoretical-elements-electrical-engineering-section-94
Locationlines 16727-16803
Statuscandidate
Word Count397
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B. THBEE-WIRE CONVERTER 109. In a converter feeding a three-wire direct-current system the neutral can be derived by connection to the transformer neutral. Even in this case, however, frequently a separate auto- transformer is used, connected across a pair of collector rings of the converter, since, as seen above, with the moderate unbalanc- ing usually existing, such a compensator is very small. When connecting the direct-current neutral to the transformer neutral it is necessary to use such a connection that the trans- former can operate as autotransformer, that is, that the direct current in each transformer divides into two branches of equal m.m.f., otherwise the direct-current produces a unidirectional magnetization in the transformer, which superimposed upon the magnetic cycle raises the magnetic induction beyond satura- tion, and thus causes excessive exciting current and heating, except
... can operate as autotransformer, that is, that the direct current in each transformer divides into two branches of equal m.m.f., otherwise the direct-current produces a unidirectional magnetization in the transformer, which superimposed upon the magnetic cycle raises the magnetic induction beyond satura- tion, and thus causes excessive exciting current and heating, except when very small. SYNCHRONOUS CONVERTERS 275 k *T. \ FIG. 149. — Neutral of Y-connected transformers connected t ...
B. THBEE-WIRE CONVERTER 109. In a converter feeding a three-wire direct-current system the neutral can be derived by connection to the transformer neutral. Even in this case, however, frequently a separate auto- transformer is used, connected across a pair of collector rings of the converter, since, as seen above, with the moderate unbalanc- ing usually existing, such a compensator is very small. When connecting the direct-current neutral to the transformer neutral it is necessary to ...
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