Electricity: electrical systems and devices – Safety and protection of systems and devices – Feeder protection in distribution networks
Patent
1981-03-23
1983-01-25
Eisenzopf, Reinhard J.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Feeder protection in distribution networks
307 44, H02H 700
Patent
active
043706916
ABSTRACT:
In a protection apparatus for a feeder (H) of an electric power transmission system compensation for mutual coupling between the feeder and another feeder (G) is controlled in dependence on the ratio of the zero sequence currents (I.sub.M, I.sub.N) in the two feeders. The mutual coupling compensation signal (I.sub.M Z.sub.M ') is arranged to be proportional to the zero sequence current (I.sub.M) in the other feeder when the ratio of the zero sequence currents is below a predetermined value, and to be limited to a value proportional to the protected feeder zero sequence current (I.sub.N) when said ratio is above the predetermined value. The arrangement reduces the possibility of maloperation of the feeder protection due to faults on the other feeder.
REFERENCES:
patent: 3430103 (1969-02-01), Rockefeller, Jr.
Eisenzopf Reinhard J.
The General Electric Company Limited
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