Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
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
ASEA Aktiebolag
Krawczewicz Stanley T.
Solis Jose M.
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