Protection means for objects included in electrical power supply networks
AssigneeASEA Aktiebolag
InventorGunnar Nimmersjo
Life of this patent
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Abstract
In an arrangement for level and sequence detection in a directional wave detector, which has a three-phase directional wave detector with two inputs per phase and three single phase and one three-phase tripping output and one three-phase blocking output, with a level detector with one partial detector for each of the single-phase tripping outputs and the three-phase blocking output, the level detector is provided with a further partial detector which is connected to the three-phase tripping output of the wave detector and the two partial detectors which are connected to the three-phase outputs of the wave detector have a lower reference level than the other partial detectors which are connected to the single-phase tripping outputs of the wave detector.
Claims2
Protection means for objects included in electrical power supply networks, comprising a three-phase directional wave detector with two inputs per phase, three single-phase and one three-phase tripping output, one three-phase blocking output, and one level detector with one partial detector for each of the single-phase tripping outputs and the three-phase blocking output, said level detector is provided with a further partial detector connected to the three-phase tripping output of the wave detector, and said two partial detectors are connected to the three-phase outputs of the wave detector and have a lower reference level than the other partial detectors of the level detector and are connected to the single-phase tripping outputs of the wave detector.
Dependencies are inferred from the claim text.