Protective relay apparatus

Details Protective relay apparatus Protective relay apparatus

1979-03-08

1980-11-18

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Feeder protection in distribution networks

361 68, 361 87, H02H 726

Patent

active

042349010

ABSTRACT:
Protective relay apparatus which performs a segregated phase current comparison of a three-phase protected line section, with a single relay at each end thereof for making the phase current comparison. The single relay includes a rectifier arrangement which provides a signal responsive to the largest phase current of a predetermined polarity, at any instant. In response to a fault detection, it successively phase compares the signals from its rectifier with the signals of the corresponding phases from the rectifier in the relay at the other line end.

REFERENCES:
patent: 2242950 (1941-05-01), Harder
patent: 3612952 (1971-10-01), Hagberg
patent: 3849763 (1974-11-01), Greene, Jr.
patent: 3882361 (1975-05-01), Hinman, Jr.
patent: 3893008 (1975-07-01), Strickland, Jr. et al.
patent: 3898531 (1975-08-01), Hinman, Jr.
patent: 3986079 (1976-10-01), Hinman, Jr. et al.
patent: 4020396 (1977-04-01), Gambale et al.
" Recent Developments in Relaying Communications Equipment"-Ray Presented to the Fourth Annual Western Protective Relay Conference 10-18-20-77.

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