US Patent 7296770 Electronic vital relay
Patent 7296770 was granted and assigned to Union Switch & Signal on November, 2007 by the United States Patent and Trademark Office.
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A railroad signaling method includes measuring a track current on a first track section, measuring a local voltage on the railroad line wires, determining whether a magnitude of the track current meets or exceeds a threshold value independent of the local voltage, and determining whether the track current and the local voltage are nominally in phase with one another in a manner that is independent of the track current measuring step. A first signal is provided only if the magnitude is determined to meet or exceed the threshold and the track current and local voltage are determined to be nominally in phase. The first signal is an indication that a train is not present in the track section, that the track section does not have a broken rail, and that the insulated joints that bound the track section do not include a fault condition. An associated relay arrangement is also provided.
US Patent 07296770 Electronic vital relay US Patent 7296770 Electronic vital relay
US Patent 07296770 Electronic vital relay
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