Method and apparatus for the detection of short circuits

Details Method and apparatus for the detection of short circuits Method and apparatus for the detection of short circuits

1974-12-06

1976-07-20

Miller, J. D.

317 38, 317 33SC, H02H 316

Patent

active

039709019

ABSTRACT:
A method for the detection of short circuits in electrical installations, in particular on railway contact wires, comprising: generating a signal corresponding to the derivative with respect to time of the monitored current, comparing the generated signal with at least one limit value, indicating a short circuit if the generated signal exceeds a limit value, monitoring the behavior of the monitored current for the occurrence of a criterion indicating the probability of a short circuit, triggering a replica signal corresponding to the behavior of the monitored current from the movement of occurrence onwards as a function of the probability criterion, comparing the replica signal with at least one limit value, and indicating a short circuit if the limit value is exceeded.

REFERENCES:
patent: 3317795 (1967-05-01), Steen
patent: 3419757 (1968-12-01), Steen
patent: 3558986 (1971-01-01), Schleif et al.
patent: 3634730 (1970-05-01), Wilson
patent: 3657605 (1972-04-01), Hill
patent: 3796918 (1974-03-01), DeForest et al.
patent: 3822399 (1974-07-01), Grund et al.
patent: 3828259 (1974-08-01), Riethmuller et al.
patent: 3836790 (1974-09-01), Becker

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