Electricity: electrical systems and devices – Safety and protection of systems and devices – Feeder protection in distribution networks
Patent
1994-05-06
1996-02-27
Hoff, Marc S.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Feeder protection in distribution networks
361 42, 361 93, H02H 726
Patent
active
054953847
ABSTRACT:
The present invention provides an arrangement for automatic selective circuit interruption in response to detection of a fault in a multi-phase distribution system feeding a plurality of network branches. The arrangement includes a plurality of line monitoring devices which are programmed to alarm a control station in response to detection of a fault in the system. In response to being alarmed by one or more line monitoring devices, the control station activates a specialized signal generator which produces a specialized signal along one of the lines of the multi-phase system. Each line monitoring device is co-located with and communicatively coupled to a circuit interrupter which, when actuated, prevents the flow of current in lines of the system positioned downstream from the actuated circuit interrupter. Each line monitoring device automatically actuates the coupled circuit interrupter within a prescribed period of time following detection of the specialized signal. By making the prescribed actuation time period longer for upstream circuit interrupters than downstream circuit interrupters, the network may continue providing power less an isolated section having the ground fault. The one or more line monitoring devices which detect the specialized signal inform the control station of the location of the fault.
REFERENCES:
patent: 3558981 (1971-01-01), Zocholl
patent: 4620257 (1984-07-01), Sano et al.
Kennedy Robert A.
Wallis Lee D.
Golden Larry I.
Hoff Marc S.
Irfan Kareem M.
Jackson S.
Square D Company
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