Residual current device with double grounded neutral fault...

Details Residual current device with double grounded neutral fault... Residual current device with double grounded neutral fault...

2007-07-10

2007-07-10

Jackson, Stephen W. (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

C361S044000

Reexamination Certificate

active

11192186

ABSTRACT:
A residual current device (RCD) senses a differential current flowing in A.C. mains supply live and neutral conductors and disconnects the supply from a load when the differential current exceeds a predetermined level. The device further includes a circuit for detecting a double grounded neutral fault in which current flows in an N-E loop formed by a double grounded neutral. The current is sensed as a differential current and detected as a correspondence between causing the current to flow and sensing the differential current.

REFERENCES:
patent: 6639769 (2003-10-01), Neiger et al.
patent: 6850394 (2005-02-01), Kim

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