MOTOR WINDING CONTAMINATION DETECTOR AND DETECTION

A method and apparatus for detecting motor contamination utilizes zero- sequence currents in a sensing coil to detect contamination. The detector includes a current transformer comprised of a magnetic core and a sensing coil wound about the core. A processor processes a sub-trip level current from t...

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Bibliographic Details
Main Authors REHDER, ROBERT HENRY, KLIMAN, GERALD BURT
Format Patent
LanguageEnglish
French
Published 01.04.2008
Subjects
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRICITY
EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
GENERATION
MEASURING
MEASURING ELECTRIC VARIABLES
MEASURING MAGNETIC VARIABLES
PHYSICS
TESTING
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Summary:A method and apparatus for detecting motor contamination utilizes zero- sequence currents in a sensing coil to detect contamination. The detector includes a current transformer comprised of a magnetic core and a sensing coil wound about the core. A processor processes a sub-trip level current from the sensing coil to detect contamination. Three contamination detection methods, which may be used separately or in desired combination, are based on current trends, current leakage, and current clustering. An alarm is triggered when predetermined alarm criteria have been met.
Bibliography:Application Number: CA19992313180