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Non-contact current and voltage sensing method using a clamshell housing and a ferrite cylinder

United States Patent

April 26, 2016
View the Complete Patent at the US Patent & Trademark Office
A method of measurement using a detachable current and voltage sensor provides an isolated and convenient technique for to measuring current passing through a conductor such as an AC branch circuit wire, as well as providing an indication of an electrostatic potential on the wire, which can be used to indicate the phase of the voltage on the wire, and optionally a magnitude of the voltage. The device includes a housing that contains the current and voltage sensors, which may be a ferrite cylinder with a hall effect sensor disposed in a gap along the circumference to measure current, or alternative a winding provided through the cylinder along its axis and a capacitive plate or wire disposed adjacent to, or within, the ferrite cylinder to provide the indication of the voltage.
Carpenter; Gary D. (Austin, TX), El-Essawy; Wael (Austin, TX), Ferreira; Alexandre Peixoto (Austin, TX), Keller; Thomas Walter (Austin, TX), Rubio; Juan C. (Austin, TX), Schappert; Michael A. (Wappingers Falls, NY)
13/ 451,524
April 19, 2012
This invention was made with government support under DE-EE0002897 awarded by the Department of Energy. The government has certain rights to this invention.