Protection device for objects included in electrical power suppl

Details Protection device for objects included in electrical power suppl Protection device for objects included in electrical power suppl

1974-08-01

1976-05-11

Miller, J D

317 27R, 317 39, H02H 338

Patent

active

039566714

ABSTRACT:
A protection device for lines, bus bars, transformers and the like in electrical networks includes for each object a directional wave detector arrangement with one detector unit per phase for sensing current and voltage transients occurring in the object in case of faults in the network. Each wave detector unit includes directional detecting devices and a plurality of level detectors connected with an output for tripping signals and an output for blocking signals. One directional wave detector unit is arranged for each connection to an object which is to be protected and is connected through level detectors to the logic system which compares the output signal from the directional wave detector for the object and disconnects the object in response to a tripping signal from any of the directional wave detectors only if none of the wave detectors has emitted a blocking signal.

REFERENCES:
patent: 3878460 (1975-04-01), Nimmersjo

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