Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1989-10-12
1992-05-19
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
Specific condition
340657, 361 94, 307152, G08B 2100
Patent
active
051152266
ABSTRACT:
An apparatus for detecting a power system disturbance. The apparatus may be a current rate-of-change relay for qualifying system-separation transfer-trip commands.
REFERENCES:
patent: 4297741 (1981-10-01), Howell
patent: 4305108 (1981-12-01), Udren
patent: 4707761 (1987-11-01), Podobiniski
patent: 4796148 (1989-01-01), Ruta
Crosland Donnie L.
Hofsass Jeffery A.
Schweitzer Engineering Laboratories Inc.
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