Downed conductor automatic detecting device

Details Downed conductor automatic detecting device Downed conductor automatic detecting device

1990-03-12

1992-04-07

Stephan, Steven L.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 7, 361 42, 361 47, 361 63, H02H 726, G01R 3108

Patent

active

051033658

ABSTRACT:
A device for detecting and isolating a downed conductor in a three-phase four-wire multi-grounded distribution system. The device 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 tap point of the distribution line. The device comprises a current detector, a low-pass filter, a high-pass filter, an arcing ground fault current-detecting circuit, a first overcurrent-detecting circuit that delivers an output when the output current from the low-pass filter exceeds a given value, a second overcurrent-detecting circuit that detects an overcurrent exceeding the breaking capacity of a 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, a main contact 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 produced an output or when the arcing ground fault current-detecting circuit or the first overcurrent-detecting circuit produces an output when the second overcurrent-detecting circuit produces no output.

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"Development of a Dedicated Microprocessor Protection Relay", by E. Horne, B. Cory, L. Petnou, 1979 IEEE.
"Design Consideration in the Development of a New Ground Distance Relay", by Wilkinson, Mathews & Keeney, (9/10)/79 IEEE Transactions.
"Protection of Neutral-Beam-Accelerator Electrodes from Spark Discharges", by W. Praeg, Conference, Proceedings of 7th Symposium, Oct. 25-28, 1977.

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