Boots – shoes – and leggings
Patent
1981-09-28
1984-08-14
Krass, Errol A.
Boots, shoes, and leggings
324 51, 361 44, 361 83, 361 89, 364481, 364482, 364483, G01R 3102
Patent
active
044660715
ABSTRACT:
Apparatus is provided for detecting the presence of a high impedance arcing fault on an electrical circuit, particularly a high voltage power line. Detection of a high impedance fault is realized by monitoring the high frequency components of the alternating current in the circuit, and evaluating the high frequency components of each cycle of the alternating current using a microcomputer operating in accordance with a program of instructions, to determine the occurrence of a significant increase in magnitude of the high frequency components, and then to determine whether the increase exists for a prescribed period of time and follows a prescribed pattern. The high frequency components are monitored using a current-to-voltage transducer coupled to the electrical circuit, bandpass filters coupled to the transducer, and an analog-to-digital converter providing digitized samples of the filtered transducer output voltage signal.
REFERENCES:
patent: 3295022 (1966-12-01), Schelisch
patent: 3515943 (1970-06-01), Warrington
patent: 4261038 (1981-04-01), Johns et al.
patent: 4297738 (1981-10-01), Lee
patent: 4313146 (1982-01-01), Lee
Mann, B. J., "Real Time Computer Calculation of the Impedance of a Faulted Single-Phase Line," Electrical Engineering Transactions, The Institution of Engineers, Australia, vol. #5, No. 1, Mar. 1969, p. 27.
Udo, Tatsuo & Kawai, Mikio, "Fault Generated Noise Voltage in a Transmission Line," IEEE Transactions on Power Apparatus and Systems, vol. PAS-86, Jun. 1967, p. 681.
IEEE Power System Relaying Committee Report, "The Interruption of Downed Conductors on Low Voltage Distribution Systems," Oct. 1976.
Beasley, William L., "An Investigation of the Radiated Signals Produced by Small Sparks on Power Lines," Ph.D. Dissertation, Texas A&M University, Jan. 1970, pp. 6-7.
Warrington, A. R. van C., "Protective Relays, Their Theory and Practice", vol. 2, Chapman and Hall, London, 1969, p. 341.
Krass Errol A.
Tager Clifford L.
Texas A&M University System
LandOfFree
High impedance fault detection apparatus and method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with High impedance fault detection apparatus and method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High impedance fault detection apparatus and method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-117288