Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1978-03-27
1981-02-03
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 52, 361 80, H02H 338, G01R 3102
Patent
active
042491240
ABSTRACT:
A method of, and apparatus for, monitoring faults at electrical lines, wherein there are formed a multiplicity of detection signals, and threshold monitoring the phase angle between timewise successive detection signals. According to a first aspect of the invention none of the detection signals has a magnitude equal to the line voltage signal. As a further aspect one of the detection signals can comprise an external signal. A still further feature contemplates that one of the detection signals is a difference signal formed by the line voltage signal and an external signal.
REFERENCES:
patent: 3626281 (1971-12-01), Souillard
patent: 3700919 (1972-10-01), Stich
patent: 3866094 (1975-02-01), Bothman et al.
patent: 3898530 (1975-08-01), Perez-Cavero
Tonnes, Martin, "Elektronisches Distanzrelais", Brown Boveri Mitteilungen, vol. 53, 1966, pp. 784-790.
Humpage et al., "Discriminative performance. . . Under Fault Operating Conditions", Proc. of the IEE, vol. 115, No. 1, Jan. 1968 pp. 141-152.
Barchetti et al., "Vechalfen von Distanzrelais . . . Dreipoligen Kuraschlussen", Brown Boveri Mitteilungen, vol. 57, 8/9 1970, Nos. 8/9, pp. 343-347.
Inbole et al., "New Technique for Quadrilateral Distance Relay, " Proc. IEE, vol. 121, No. 6, June 1974 p. 462-466.
"New Technique for Quadrilateral Distance Relay," Proc. IEE, vol. 121, No. 11, 1974 p. 1421-1422.
BBC Brown Boveri & Company Limited
Kleeman Werner W.
Strecker Gerard R.
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