Patent ID: 8537508
Filing Date: 2013-09-17
Classification: H02H

Abstract:
1. A system for detecting potentially damaging electromagnetic signals including high direct currents in a transformer neutral and harmonics of a primary power frequency, the system comprising: a plurality of detection components electrically connected to one or more electrical signal lines leading from one or more connection points on a power grid; a plurality of threshold detectors, each threshold detector configured to compare an incoming signal from a detection component selected from among the plurality of detection components to a predetermined signal having a threshold; a controller receiving an output from each of the plurality of threshold detectors, the controller configured to drive at least one external component in response to receiving an indication from at least one of the plurality of threshold detectors of a detected harmonic or direct current signal above a threshold; and a shielded enclosure having an interior volume housing at least the plurality of the threshold detectors and the controller, the shielded enclosure configured to shield the interior volume from electromagnetic interference.