Ground fault detection in an ungrounded electrical system

Details Ground fault detection in an ungrounded electrical system Ground fault detection in an ungrounded electrical system

2011-07-26

2011-07-26

Jackson, Stephen W (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

C361S049000, C340S649000, C340S650000

Reexamination Certificate

active

07986500

ABSTRACT:
An ungrounded 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. 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.

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