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

1976-08-31

Miller, J D

317 27R, 317 36TD, H02H 308

Patent

active

039783740

ABSTRACT:
A method for the detection of short circuits in electrical installations, in particular on railway contact wires, comprising generating a measuring signal dependent on the derivative with respect to time of the monitored current, comparing the measuring signal with at least one limit value, determining the time for which the measuring signal exceeds a limit value, comparing the time with a preset time interval, initiating indication of a short circuit when the time for which the measuring signal exceeds the limit value also exceeds the time interval, checking the measuring signal on the occurrence of a decrease following an initial increase and on the occurrence of a subsequent increase, and generating a blocking signal inhibiting indication of a short circuit as a function of the occurrence of such a subsequent increase.

REFERENCES:
patent: 3419757 (1968-12-01), Steen
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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