Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – For fault location
Patent
1994-11-18
1997-03-04
Wieder, Kenneth A.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
For fault location
324536, 324133, 324233, 324521, G01R 3102
Patent
active
056083289
ABSTRACT:
When a fault in an energized power distribution cable flashes over, the surge draws charge from both sides of the line. The fault thus produces a pair of current surges that propagate from the fault in opposite directions along the line. These oppositely-directed current surges create pulsed electromagnetic fields of different directions which, in turn, induce voltages of different polarities in a receiving antenna positioned along the line. The polarity of the first such voltage pulse induced in the antenna indicates the direction from the antenna to the fault. In one embodiment, the line is repeatedly "thumped," causing flashovers to recur at the fault. By moving the antenna along the line until the polarity of the initial received pulse inverts, the precise location of the fault can be determined. In another embodiment, direction-indicating fault current indicators according to the present invention are permanently placed at numerous locations in an operating AC power distribution system, in anticipation of a fault. When a fault occurs, the polarity of the first received electromagnetic fault pulse at each device indicates the respective direction from the device to the fault.
REFERENCES:
patent: 3539922 (1970-11-01), Brockman
patent: 3727128 (1973-04-01), McFerrin
patent: 3986116 (1976-10-01), Smith
patent: 4063171 (1977-12-01), Schweitzer
patent: 4291204 (1981-09-01), Crick
patent: 4347827 (1982-09-01), LoCascio
patent: 4439723 (1984-03-01), Loftness
patent: 4446420 (1984-05-01), Drouet
patent: 4475079 (1984-10-01), Gale
patent: 4491782 (1985-01-01), Bellis et al.
patent: 4585997 (1986-04-01), Lin
patent: 4609866 (1986-09-01), Loftness
patent: 4649335 (1987-03-01), Lassaux et al.
patent: 4766549 (1988-08-01), Schweitzer, III et al.
patent: 4859951 (1989-08-01), Cole et al.
patent: 4896117 (1990-01-01), Floweredew et al.
patent: 4929903 (1990-05-01), Saigo
patent: 5029118 (1991-07-01), Nakajima et al.
patent: 5083086 (1992-01-01), Steiner
patent: 5185686 (1993-02-01), Hansen
patent: 5206595 (1993-04-01), Wiggins et al.
patent: 5352984 (1994-10-01), Piesinger
Banker, W. A. et al., "Application of High Resolution Radar to Provide Non-Destructive Test Techniques for Locating URD Cable Faults and Splices", 1993 IEEE, pp. 1-7. (Month Unavailable).
Clegg, Barry, "Pin-Pointing," Underground Cable Fault Location, McGraw-Hill Book Company, 1993, Chapter 4, pp. 112-151. (Month Unavailable).
Clark, "Cancel 60 Hz and Other Noise," Electronic Design 20, Sep. 27, 1976, pp. 74-79.
"Oak RF Interference Locator Model F-300," Oak Industries, Advertisement, 1977. (Month Unavailable).
"Model 700 Interference Locator," Sprague Engineering Bulletin No. 90033, Sprague Electric Company, 1979, 5 pages. (Month Unavailable).
Baker, E. E. Florida Power Corporation, "Fault Distance Indicator for URD Cable Circuits," IEEE/PES Transmission and Distribution Conference--Panel #29, Apr. 12, 1994, pp. 1-5.
Wiggins et al., "A Novel Concept for URD Cable Fault Location," 1993 IEEE, pp. 1-7. (Month Unavailable).
"Faulted Circuit Indicators," KeyNotes, brochure by Kearney, Jul., 1989, 7 pages.
"Pocket Size Magnetic Impulse Indicator Model MI-88," brochure by the VON Corporation, Mar., 1989, one page.
"Cable Fault Locator Used with any brand thumper," advertisement by Aqua-tronics, Inc. Northwest Public Power Bulletin, May, 1994, one page.
Weeks, Walter L. et al., "Above Ground Detection and Interpretation of Transient Signals on Underground Power Distribution Systems," 1994 IEEE, pp. 389-396. (Month Unavailable).
Steiner, J. P. et al., "An Automated Fault Locating System," 1991 IEEE, pp. 219-230. (Month Unavailable).
"Hotstick Line Sniffer Model 247," Radar Engineers, Oct., 1991, 2 pages.
Tarpey et al., "Non-Destructive, High Resolution Radar (HRR) System for Locating URD Faults and Splices", 91st ICC Meeting, Nov. 1992, Appendix XII-C-1--Appendix XII-C-16.
"Time-Domain Reflectometry for Monitoring Cable Changes Feasibility Study," Prepared by Purdue University, EPRI GS-6642, Project 2308-18 Final Report, Feb. 1990, 59 pages.
Widrow et al., "Adaptive Modeling and System Identification," Adaptive Signal Processing, Chapter 9, 1985, pp. 195-196. (Month Unavailable).
Komoda et al., "Development of a Current Detection Type Cable Fault Locator," Conference Record 90 WM 248-5 PWRD, IEEE Winter Power Meeting, Atlanta, Georgia, Feb., 1990, 5 pages.
Schwarz et al., "Fault Location in Underground Cable," IEEE PES Meeting, Jul. 1975, 3 pages.
Banker et al., "Application of High Resolution Radar to Provide Non-Destructive Test Techniques for Locating URD Cable Faults and Splices," 1993 IEEE, 7 pages. (Month Unavailable).
"Evaluation of Underground Fault Location Techniques," Prepared by The BDM Corporation, EPRI TD-153, Research Project 481-1, Final Report, Apr. 1976, 3 pages.
Steiner et al., Project 2895-1, EPRI EL-6765, Final Report, Prepared by Purdue University, Mar., 1990, pp. 6-13-7-3.
"PLI-150 Interference Locator System," Trilithic brocure, 2 pages, published prior to Nov. 18, 1994.
"Hand-held EMI/RFI Detector," ABN, Inc. Advertisement, one page, published prior to Nov. 18, 1994.
"Biddle Acoustic Impulse Detector," Cable Test Equipment--Power, AVO International, one page brochure, published prior to Nov. 18, 1994.
"HDW Digiphone Pinpointer," brochure by HDW Electronics, Inc., 2 pages, published prior to Nov. 18, 1994.
"Pinpoint the Source of R-F and TVI Noise with Little Snoop Interference Locator," Micro Tech Mfg. Inc., 4 pages, published prior to Nov. 18, 1994.
"The Super Snoop Will Pinpoint the Noise Source to the Exact Pole," Micro Tech Mfg. Inc., 2 pages, published prior to Nov. 18, 1994.
"DDF Defect Direction Finding Locator Model 237," Radar Engineers, 2 pages, published prior to Nov. 18, 1994.
"Sadelco Model FS 4-VU Signal Level Meter," Sadelco, Inc., 2 pages, published prior to Nov. 18, 1994.
"Vehicular Locating System for Radio/TV Interference," Radar Engineers, 2 pages, published prior to Nov. 18, 1994.
"Operations Manual Model 237 DDF Locator," Radar Engineers booklet, 20 pages, published prior to Nov. 18, 1994.
Radar Engineers
Solis Jose M.
Wieder Kenneth A.
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