AC-EXCITED GENERATOR-MOTOR

PROBLEM TO BE SOLVED: To judge a fault of a secondary circuit load and a fault of an AC exciting means. SOLUTION: A neutral point current flowing to an AC exciting synchronous machine 26 side is detected by a current detector 24 with secondary circuit equipment 38a to 38c of currents flowing to neut...

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Bibliographic Details
Main Authors NISHIOKA ATSUSHI, KAYUKAWA SHIGEHIRO, FUJII TOSHINARI, HIGUCHI MIKISUKE, NAKAGAWA HIROTO
Format Patent
LanguageEnglish
Published 28.09.2001
Edition7
Subjects
CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS
CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRICITY
GENERATION
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Summary:PROBLEM TO BE SOLVED: To judge a fault of a secondary circuit load and a fault of an AC exciting means. SOLUTION: A neutral point current flowing to an AC exciting synchronous machine 26 side is detected by a current detector 24 with secondary circuit equipment 38a to 38c of currents flowing to neutral point circuits for connecting frequency converters 18a to 18c to the machine 26 as a reference. Currents of the converters 18a to 18c are respectively detected by current detectors 22a to 22c. A coincidence of the detected current Inr with a polarity of a current Inc indicating a sum of the detected currents Inca, Incb, Incc is judged by a current fault detector 32. When the polarities coincide, a protective operation of a protective logic circuit 30 is stopped. Meanwhile, when the polarities are different, drive operations of the converters 18a to 18c are stopped by the circuit 30.
Bibliography:Application Number: JP20000080024