发明名称 |
Apparatus for measuring voltages and currents using non-contacting sensors |
摘要 |
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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申请公布号 |
US5473244(A) |
申请公布日期 |
1995.12.05 |
申请号 |
US19940177709 |
申请日期 |
1994.01.05 |
申请人 |
LIBOVE, JOEL M.;SINGER, JEROME R. |
发明人 |
LIBOVE, JOEL M.;SINGER, JEROME R. |
分类号 |
G01R1/22;G01R15/14;G01R15/16;(IPC1-7):G01R15/06;G01R1/30 |
主分类号 |
G01R1/22 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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