Electrical contact avoidance device
AssigneeOntario Hydro
InventorsRobert C. Hanrahan, James Williamson
Life of this patent
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Abstract
An electrical contact avoidance device comprises an inductor plate directly or capacitively coupled to the user and coupled to a detector circuit which derives a DC signal corresponding to a voltage induced in the user's body by a radiated high voltage electrostatic field. A comparator compares the DC signal with a reference signal representing the potential difference between the inductor and reference plates, and activates an alarm if the detected signal exceeds a preselected reference level.
Claims12
A portable monitoring system for detecting a voltage induced in a user's body by a radiated electrostatic field, and producing a warning when the detected voltage exceeds a selected value, comprising
- a platform suitable for the user to stand on, having an inductor plate separated from a reference plate by an electrically insulating frame whereby the inductor plate is electrically coupled to the user, and
- a monitoring circuit having detector circuit means for deriving a DC signal corresponding to the detected voltage, comparator means for comparing the DC signal with a selected reference signal representing the potential difference between the inductor plate and the reference plate, and alarm means responsive to an output signal from the comparator.
A powered aerial access device for elevating a person comprising a vehicle having actuating means for raising and lowering a basket, the basket including a conductive floor,
- a plate form having an inductor plate overlaying and insulated from the conductive floor, and
- monitoring circuitry comprising a detector circuit for deriving a DC signal corresponding to a detected potential on a person's body, comparator means for comparing the DC signal with a selected reference signal for producing an output signal when the DC signal level exceeds the reference signal level, and alarm means responsive to the output signal whereby the reference signal represents a potential difference between the inductor plate and a reference plate insulated from the inductor plate.
Dependencies are inferred from the claim text.