Vibration based deenergized cable detector and method
AssigneeConsolidated Edison Company of New York, Inc.
InventorsZivan Zabar, Bernard R. S. Cheo
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Abstract
Measurements are taken perimetrically about power or feeder cables at equidistant spaced locations with one or more vibration transducers feeding an electronic measuring circuit sharply tuned to twice the fundamental frequency of the supply system. A substantially flat response around the cable indicates a deenergized cable, while an energized cable produces vibrations that vary sinusoidally in amplitude as the readings progress around the cable.
Claims11
Apparatus for determining the status of electric power cables in an alternating current supply system, distinguishing between energized and deenergized cables, comprising at least one vibration transducer, means for mechanically coupling said transducer to the exterior surface of a power cable for sensing vibration at said exterior surface, and means for indicating the magnitude of said vibration sensed by said transducer that occurs at a predetermined frequency substantially equal to twice the supply system fundamental frequency.
The method for determining the status of electric power cables in an alternating current supply system, distinguishing between energized and deenergized cables, comprising in combination the steps of mechanically coupling at least one vibration transducer to the exterior surface of a power cable for sensing vibration at said exterior surface, and detecting vibration that occurs at a predetermined frequency substantially equal to twice the supply system fundamental frequency as indicative of an energized cable.
The method for determining the status of electric power cables in an alternating current supply system, distinguishing between energized and deenergized cables, comprising in combination the steps of determining the magnitude of vibration that occurs at substantially twice the supply system fundamental frequency at perimetrically spaced locations about the outer surface of the cable, and interpreting as indicative of a deenergized cable the detection of substantially the same low level of detectable vibration at each of said locations.
Dependencies are inferred from the claim text.