Downed conductor automatic detecting device

Details Downed conductor automatic detecting device Downed conductor automatic detecting device

1991-05-20

1993-09-14

DeBoer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 92, 361 93, H02H 313, H02H 316

Patent

active

052454983

ABSTRACT:
A device for detecting and isolating a downed conductor in a three-phase four-wire multi-grounded distribution system cooperates with a power supply protective device if the device has a breaking capacity less than the maximum prospective short-circuit current of the distribution line, and the device is installed at a lateral of the distribution line. The device comprises a current detecting device, a high-pass filter, a band-pass filter, two arcing ground fault current-detecting circuits, a first overcurrent-detecting circuit that delivers an output when the output current form the current detecting device exceeds a predetermined value, a second overcurrent-detecting circuit that detects an overcurrent exceeding the breaking capacity of the device which has a breaking capacity less than the maximum prospective short-circuit current of the distribution line, a no-voltage detecting circuit for sensing that the distribution line is not electrically charged, and a trip mechanism. This trip mechanism opens the device either when the no-voltage detecting circuit produces an output after the second overcurrent-detecting circuit produces an output or when any one or more of the arcing ground fault current-detecting circuits or the first overcurrent-detecting circuit produces an output while the second overcurrent-detecting circuit produces no output.

REFERENCES:
patent: 4004201 (1977-01-01), Depuy
patent: 4196463 (1980-04-01), Dickerson
patent: 4297738 (1981-10-01), Lee
patent: 4297740 (1981-10-01), Hagberg
patent: 4313146 (1982-01-01), Lee
patent: 4429338 (1984-01-01), Becker et al.
patent: 4600961 (1986-07-01), Bishop
patent: 4871971 (1989-10-01), Jeerings et al.
patent: 5103365 (1992-04-01), Uchida et al.

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