Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element
Patent
1995-04-03
1997-07-22
O'Shea, Sandra L.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of individual circuit component or element
324534, H01H 3102, G01R 3111
Patent
active
056507283
ABSTRACT:
A system comprising a portable apparatus and employing a method of admittance versus frequency analysis to detect the existence of a fault in a de-energized electrical line regardless of whether the line contains branches. The portable apparatus comprises a capacitor unit detachably connected to a de-energized line, ground or a neutral conductor, a switch unit detachably connected to a de-energized line, the de-energized line being tested, and an insulated cable connecting the capacitor unit to the switch unit. The switch unit comprises a discharge switch that can be activated by pulling on the hot line tool. The capacitor unit comprises a capacitor which is discharged into the electrical line via the insulated cable and the switch unit when the discharge switch is activated to create a pulse. The capacitor unit comprises circuitry for generating voltage and current samples of pulse response signals and a microprocessor for determining the admittance of the electrical line using Fast Fourier transforms of the current and voltage samples. The admittance of the line is compared with stored data relating to lines having different load impedances and having faults located at various distances from the capacitor unit and detectable at various frequencies to determine the existence of a fault.
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A Thesis entitled Fault Detection on Distribution Laterals by David A. Rhein presented to the University of Missouri--Rolla, Anticipated Publication 1995.
Beard Lloyd Ronald
Herrick Thomas Jude
Rhein David Adelbert
Roberts Gerald Bernard
'Hubbell Incorporated
Longanecker Stacey J.
O'Shea Sandra L.
Phillips Roger
Presson Jerry M.
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