Ground fault detection and localization in an ungrounded or...

Details Ground fault detection and localization in an ungrounded or... Ground fault detection and localization in an ungrounded or...

2011-06-28

2011-06-28

Fureman, Jared J (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

C361S044000, C361S045000

Reexamination Certificate

active

07969696

ABSTRACT:
An ungrounded or floating DC electrical power distribution system may experience a single line to ground fault. Such a fault may not disrupt operation of the system, but its presence may raise a risk of additional problems if left uncorrected. A system for progressively grounding the ungrounded system may be initiated when a line to ground fault is suspected based on the voltage difference measured to a common chassis point. As grounding through successively lower impedance proceeds, fault current may increase and detection of severity of the line to ground fault may be more readily achieved, thus facilitating localization of the fault. Localization may be achieved through an analysis of direction of capacitive currents in isolatable zones of the system.

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patent: 2004-239863 (2004-08-01), None
patent: WO 2005119871 (2005-12-01), None

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