Accurate Magnetic Field Sensor and Method For Wireless Phasor Measurement Unit

A Wireless Phasor Measurement Unit (Wireless PMU) includes a coil for magnetic field transduction measurement of phasor data in a transmission line having a widely variable current. The coil output is amplified by a two stage, high gain, selectable gain ratio amplifier that maintains a substantially constant order of magnitude in the amplifier output as the current varies. A digital low pass filter of a third order Butterworth configuration substantially reduces deleterious anomalies appearing in the amplifier output. Shielding is provided to further reduce anomalies. Phasor data is calculated by a processor, and is at least as accurate as phasor data from a PMU using transformers to measure the same electrical characteristic.

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For Information, Contact:
Li Chen
Licensing Associate
Virginia Tech Intellectual Properties, Inc.
(540) 443-9217
Yilu Liu
Yingchen Zhang
Guorui Zhang