Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With coupling means
Patent
1994-01-05
1995-12-05
Nguyen, Vinh P.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With coupling means
324130, G01R 1506, G01R 130
Patent
active
054732441
ABSTRACT:
An apparatus for performing non-contacting measurements of the voltage, current and power levels of conductive elements such as wires, cables and the like includes an arrangement of capacitive sensors for generating a first current in response to variation in voltage of a conductive element. Each sensor is positioned in an electric field of the conductive element, and is thereby coupled to the conductive element through a coupling capacitance. A reference source drives the capacitive sensor arrangement at a reference frequency so as to induce the flow of a reference current therethrough. A measurement network is disposed to calculate the coupling capacitance based on a measurement of the reference current, and to then determine the voltage in the conductive element based on the first current and the coupling capacitance. Measurements of a composite current through single or multiple-element conductors may be effected using a similar procedure, wherein the composite current induces a measurement current to flow within a set of coils positioned in a predetermined manner proximate the conductor. In both current and voltage measurements a balancing procedure may be employed, in which a measurement signal is balanced by a feedback signal so as to improve accuracy and reduce the effects of stray coupling.
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"Non Contact Voltmeter Increases Safety and Speed"; Design News Mar. 6, 1995; pp. 114-115.
Libove Joel M.
Singer Jerome R.
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