Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection
Patent
1979-07-31
1981-06-02
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Ground fault protection
361 96, H02H 316
Patent
active
042714443
ABSTRACT:
The secondary currents of plural current transformers are applied to a full-wave rectifying network for developing an overcurrent signal and a ground fault current signal; the latter flowing in a circuit path embraced by the toroidal core of a miniature current transformer. A transformed ground fault current signal appearing in the multi-turn secondary winding thereof is applied to a ground fault trip mode network operating to measure the signal magnitude against an adjustably established, continuous ground fault trip-time curve including a vertical pick-up curve portion and a sloping inverse time (I.sup.2 t) delay portion which terminates in a selected one of plural horizontal, fixed time delay portions pursuant to issuing an appropriately delayed ground fault trip signal. Provisions for zone selective interlocking between upstream and downstream breakers are also described.
REFERENCES:
patent: 3619723 (1971-11-01), Walden
patent: 3697810 (1972-10-01), Wilson et al.
patent: 3899717 (1975-08-01), Legatti et al.
patent: 4115829 (1978-09-01), Howell
patent: 4121269 (1978-10-01), Hobson, Jr.
Bernkopf Walter C.
Cahill Robert A.
General Electric Company
Salce Patrick R.
Schlamp Philip L.
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