Method and apparatus for the protection of DC distribution systems

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United States of America Patent

PATENT NO 9748762
SERIAL NO

14255674

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Abstract

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While transient current magnitudes at different locations within a DC distribution system themselves are not a reliable indicator of fault location, it is recognized herein that accumulating energy or pseudo energy values provides a reliable basis for tripping the protection element at a fault location. Thus, in one aspect of the teachings herein, pseudo energy values are accumulated independently during a fault condition, for each of one or more protected branch circuits and the protection element for each such branch circuit is tripped responsive to the accumulated pseudo energy values reaching a defined pseudo energy threshold. The pseudo energy thresholds are defined so that the protection element in the branch circuit where the fault is located will trip first.

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Patent Owner(s)

Patent OwnerAddress
ABB SCHWEIZ AG5400 BADEN

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Pan, Jiuping Raleigh, US 35 537
Qi, Li Cary, US 30 292

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