Apparatus for rapid recognition of short-circuits

Details Apparatus for rapid recognition of short-circuits Apparatus for rapid recognition of short-circuits

1987-07-30

1989-03-07

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 79, 361 88, H02H 318

Patent

active

048111546

ABSTRACT:
The invention relates to a configuration for rapid detection of short-circuits and for generating an electrical trigger command with an electronic measuring and processing configuration for current values, which compared in a digital comparison circuit with predetermined limit values transmits the trigger command. The measuring configuration determines the current over time as well as the voltage of the grid and the resulting complex impedances and power. In addition to segmentation, standardization and scaling of the current and voltage values, a cross correlation function as well as the respective product and quotient of the Fourier transforms of the voltage and the current for frequency ranges associated with each other are determined, so that a respective power and impedance spectrum are obtained for evaluating the state of the installation.

REFERENCES:
patent: 3984737 (1976-10-01), Okamura et al.
patent: 4148087 (1979-04-01), Phadke
patent: 4300182 (1981-11-01), Schweitzer, III
patent: 4455612 (1984-06-01), Girgis et al.
patent: 4466071 (1984-08-01), Russel, Jr.
Elektrotechnische Zeitschrift E.T.Z.-A, vol. 94, No. 4, Apr. 1973, pp. 216-220.
IEEE Transactions on Power Apparatus & Systems, vol. 91, May 1971, pp. 1235-1240.

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