Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – For fault location
Patent
1992-11-04
1994-10-04
Wieder, Kenneth A.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
For fault location
324528, 324535, G01R 3108
Patent
active
053529847
ABSTRACT:
A PN modulated signal is applied to a near end of a buried electrical cable. The signal produces an initial pulse, a second pulse of energy reflected from a fault and a third pulse representative of the far end of the cable. The time/distance between the second and third pulses is stored. As the PN signal is continuously applied an operator, using an antenna coupled monitor, walks along the cable noting the time/distance between the initial and third pulses. When this time/distance equals the stored time/distance the operator is standing over the fault. If the fault is a high resistance fault a high voltage pulse is applied to the near end of the cable. The PN signal is initially sensed at a time when the fault has a low resistance because of arcing due to the high voltage pulse. To reduce stress on the cable, the arc is initialized by a high voltage low current signal and is maintained by a low voltage high current signal.
REFERENCES:
patent: 3991364 (1976-11-01), Wiznerowicz
patent: 4241305 (1980-12-01), Dickerson
patent: 4835478 (1989-05-01), Haddon et al.
patent: 5083086 (1992-01-01), Steiner
patent: 5138265 (1992-08-01), Kawamura et al.
patent: 5243294 (1993-09-01), Burnett
Brown Glenn W.
Cable Repair Systems Corporation
Flickinger Don J.
Meschkow Jordan M.
Parsons Robert A.
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