Differential arc reflectometry

Details Differential arc reflectometry Differential arc reflectometry

1990-07-12

1992-01-21

Wieder, Kenneth A.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

324534, 324644, 379 26, G01R 3111

Patent

active

050830864

ABSTRACT:
Location of a fault in electrical conductors from a terminal position which may be remote from the fault using at least a broad band pulse generator to generate a pulse at a terminal position. It also uses a voltage source at the terminal position capable of inducing a change of impedance at the fault and time measuring means also at the terminal position. The method involves generating a first pulse at the terminal position which is propagated down the conductor and reflected back to the terminal position from various impedance discontinuities, including the impedance discontinuity of the fault, if present. The pattern of reflections from points along the conductor up to the fault resulting from the first pulse are recorded. Then sufficient voltage is applied to the cable to induce a change in impedance at the fault. Simultaneously a second pulse similar to the first is generated at the terminal position and reflected back from the various impedance discontinuities, including the modified impedance discontinuity at the fault. The reflections of the first pulse are then substracted from the reflections of the second pulse leaving the pulse reflected from the fault. The location of the fault is then determined from the time taken from initiation to reflection of the pulse to the terminal position.

REFERENCES:
patent: 4291204 (1981-09-01), Crick
patent: 4491782 (1985-01-01), Bellis et al.
patent: 4649335 (1987-03-01), Lassaux
patent: 4859951 (1989-08-01), Cole
"Time-Domain Reflectometry for Monitoring Cable Changes", Steiner, J. P., Weeks, W. L., EPRI Final Report, EPRI GS-6642-Feb. 1990.
"Development of a Current Detection Type Cable Fault Locator", Komoda, M., Kawashima, T., Arakane, M., Aihara, M., Fujiwara, Y., Conference Record 90 WM 248-5 PWRD, IEEE Winter Power Meeting, Atlanta, Ga., Feb. 1990.
EPRI Report TD-153: "Evaluation of Underground Fault Location Techniques", Apr. 1976.
Schwarz: "Fault Location in Underground Cable"--IEEE PES Meeting--Jul. 1975.
Widrow: "Adaptive Signal Processing"--Prentice Hall--1985--Ch. 9.

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