Monitoring elements in a multi-phase alternating current network

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United States of America Patent

PATENT NO 6177803
SERIAL NO

08475407

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Abstract

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A group of bushings receives voltage in parallel to produce a current output from each bushing. Cumulatively combining the current outputs from the bushings vectorially furnishes a vector sum bushing current. Reference voltage devices also produce reference current outputs. Cumulatively combining the reference current outputs vectorially provides a vector sum reference current, and differentially vectorially combining the vector sum reference current with the vector sum bushing current delayed by 90.degree. provides a difference signal representative of a bushing condition. As an alternative to the reference voltage devices, a second group of bushings may be used. In this case, a delay of 90.degree. is not required. The invention may also be used to monitor the condition of other capacitive devices, for example, high voltage current transformers.

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Patent Owner(s)

Patent OwnerAddress
DOBLE ENGINEERING COMPANY A CORP OF MA85 WALNUT STREET WATERTOWN MA 02172

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Cavigelli, George A Lexington, MA 8 94
Train, David Framingham, MA 1 11
von, Guggenberg Philip A Cambridge, MA 6 47

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