Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection
Patent
1996-08-26
1998-06-30
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Ground fault protection
361101, H02H 300
Patent
active
057743169
ABSTRACT:
A ground fault detection and line power supply control system protects telecommunication service personnel working on line-powered telephone circuits from ground faults, without requiring that the line power supply be disconnected or shut down prior to a technician working on the line. A ground fault loop sensing current is sourced from an auxiliary DC voltage source that is separate and distinct from the line power supply. This auxiliary DC voltage source is coupled through a ground fault current sense resistor to one side of the powered line, so that detection of a ground fault condition is not dependent upon the supply of current from the potentially hazardous line supply. If a ground fault occurs through either or both of the powered lines, the current flow through the sense resistor will exceed a prescribed threshold, and initiate operation of a switching circuit within the line-powering equipment, thereby rapidly reducing power to the telephone line until the ground fault is cleared or the loop power supply is reset.
REFERENCES:
patent: 4410925 (1983-10-01), Tucker et al.
patent: 4571460 (1986-02-01), Rosenbaum et al.
patent: 4679111 (1987-07-01), Koch et al.
patent: 4739274 (1988-04-01), Kimball et al.
patent: 4739275 (1988-04-01), Kimball et al.
patent: 4929901 (1990-05-01), Kimball et al.
patent: 4969062 (1990-11-01), Barylak et al.
McGary John S.
Robinson Steven M.
Zitting Barry C.
Adtran Inc.
Gaffin Jeffrey A.
Medley Sally C.
Wands Charles E.
LandOfFree
Ground fault detector for line-powered telephone network does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Ground fault detector for line-powered telephone network, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ground fault detector for line-powered telephone network will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1866348