Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means
Patent
1991-11-25
1993-11-02
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific quantity comparison means
361 88, 361 93, H02H 305
Patent
active
052588858
ABSTRACT:
A digital protective relay apparatus for protecting a power system comprises an accident determination section for determining an accident in the power system, which receives a voltage and a current of the power system from the power system to determine an accident in the power system using the voltage and the current, outputs a determination signal indicating the presence/absence of an accident in accordance with a result of the accident determination, and outputs a first trip signal upon detecting an accident in the power system in accordance with the accident determination, a protection sequence section for receiving the determination signal from the accident determination section to determine necessity of a trip output by performing predetermined sequence processing using the determination signal, and outputting a second trip signal upon obtaining a determination result indicating that a trip command is to be output, and a trip generator for generating, when both of the first and second trip signals are output, a third trip signal for opening a circuit breaker provided to protect the power system.
REFERENCES:
patent: 4441136 (1984-04-01), Hampshire
patent: 4709295 (1987-11-01), Yamaura et al.
Hattori Masahiro
Inagaki Jun-ichi
Kabushiki Kaisha Toshiba
Leja Ronald W.
Pellinen A. D.
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