Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection
Patent
1986-02-20
1987-11-17
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Ground fault protection
361 45, 361 93, 361102, H02H 316
Patent
active
047077590
ABSTRACT:
Improved shock and electrical-fire protection circuits provide line-to-ground plus "line-to-line" fault protection in a power system, and monitor conditions after protective interruption to safely provide automatic restoration of current when the fault is cleared. Both full-wave and half-wave circuits employ less expensive component combinations, including rectifiers and electromagnetic relays, to carry and switch load current. Protection is provided against the possibility of semi-conductor failure and the hazards associated with severed power conductors. A specialized resistance network fault detector for sensitizing enclosures, a hybrid zero sequence current transformer system and polyphase supply provide additional features.
REFERENCES:
patent: 3675079 (1972-07-01), Labbaye
patent: 3997818 (1976-12-01), Bodkin
patent: 4344100 (1982-08-01), Davidson et al.
Pellinen A. D.
Williams H. L.
Yeager Arthur G.
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