Method of detecting ground faults in a network for distribution

Details Method of detecting ground faults in a network for distribution Method of detecting ground faults in a network for distribution

1982-10-29

1985-07-16

Krawczewicz, Stanley T.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

G01R 3102, G01R 3108

Patent

active

045299293

ABSTRACT:
A method and a device for detecting ground faults in a network for distribution of electric power from a power station from which a number of lines, included in the network, emanate and where the ground fault current I.sub.J of each line is measured. According to this method, that line is selected (10) which shows the greatest active ground fault current I.sub.JR (8), alternatively the greatest ground fault current I.sub.J, or the greatest change in the ground fault current .DELTA.I.sub.J. Thereafter, the measured ground fault current, or the change thereof, in the selected line is compared (12) with at least one predetermined reference value (11). A fault indication is obtained (13) at a level exceeding the reference value.

REFERENCES:
patent: 3609534 (1971-09-01), Gurevitch
patent: 3800215 (1974-03-01), Souillard
patent: 4408155 (1983-10-01), McBride

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