Patent
1975-05-19
1976-06-22
Miller, J. D.
317 27R, 317 32, H02H 102
Patent
active
039653943
ABSTRACT:
Disclosed is an apparatus for protecting a three-phase power transmission line, having three power conductors, from intermembral electrical faults. First, second, and third sensing and rectifying means are inductively associated with respective ones of the three power conductors of the power transmission line for generating respective DC signals corresponding to the current flow through the respective, associated power conductors. A first switching means is provided for disconnecting the power transmission line from a power source upon the occurrence of a voltage imbalance between the sensing and rectifying means. Another switching means is provided for temporarily interconnecting the outputs of the sensing and rectifying means before operation of the first switching means, for preventing spurious tripping of the first switching means during sharp increases in power which do not occur as a result of a fault. In the preferred embodiment, the response time of the second switching means is shortened in the event of an increase in power involving a fault.
REFERENCES:
patent: 3183405 (1965-05-01), Sonnemann
patent: 3546537 (1970-12-01), Jump et al.
Cate James M.
LTV Aerospace Corporation
Miller J. D.
Moose Harry
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