Ground fault detection methods on variable frequency drive systems

Number of patents in Portfolio can not be more than 2000

United States of America

PATENT NO 11329589
APP PUB NO 20130257334A1
SERIAL NO

13842707

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Abstract

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A mining machine including a motor, an adjustable speed drive providing a voltage to the motor, the voltage having an excitation component comprising a magnitude and a frequency for operating the motor at a desired speed and including an additional voltage component for use in detecting a ground fault condition, and a ground fault relay for detecting a ground fault current when the ground fault current exceeds a predetermined threshold.

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Patent Owner(s)

Patent OwnerAddress
JOY GLOBAL UNDERGROUND MINING LLC40 PENNWOOD PLACE SUITE 100 WARRENDALE PA 15086

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Dalton, Peter M New South Wales, AU 2 2
Jordan, Michael Cranberry, US 52 1142

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