Ground fault location system and ground fault detector therefor

Details Ground fault location system and ground fault detector therefor Ground fault location system and ground fault detector therefor

1999-03-18

2000-11-28

Metjahic, Safet

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of ground fault indication

324525, G01R 3114

Patent

active

061540366

ABSTRACT:
A ground fault location system is used in a multi-phase ungrounded or high-impedance grounded power network. A signal generator is coupled to the network at a first location and generates for each network phase an individual non-DC voltage signal between such phase and ground. A ground fault detector is coupled to the network at a second location and has a summing device and an annunciator. The summing device is coupled to all of the phases of the network at such second location, sums any current passing therethrough, and produces a sum signal. The annunciator receives the sum signal and provides an indication when such signal is non-zero. Each phase of the network at the second location has a distribution current passing therethrough, the sum thereof normally being substantially zero and resulting in a substantially zero sum signal and the lack of an indication from the annunciator based on such distribution currents. When the second location is on a path between the first location and a ground fault, the individual voltage signal on at least one of the phases generates a fault current thereon through such path and results in a non-zero sum signal and an indication from the annunciator. When the second location is not on such path, none of the individual voltage signals generates a fault current on any phase through such path, resulting in a substantially zero sum signal and the lack of an indication from the annunciator.

REFERENCES:
patent: 4020394 (1977-04-01), Potash
patent: 4206398 (1980-06-01), Janning
patent: 4546309 (1985-10-01), Kang et al.
patent: 4851782 (1989-07-01), Jeerings et al.
patent: 4878142 (1989-10-01), Bergman et al.
patent: 5495384 (1996-02-01), Wallis et al.
patent: 5629825 (1997-05-01), Wallis et al.
patent: 5773980 (1998-06-01), Yang
patent: 6005393 (1999-12-01), Baumgarti

Affiliated with

Also associated with

Rating

Ground fault location system and ground fault detector therefor 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 location system and ground fault detector therefor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ground fault location system and ground fault detector therefor will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1729278