Patent ID: 8437969

Claim:
A phasor measurement unit comprising: a magnetic field transducer for transduction measurement of an electrical characteristic of a current carrying element in at least one of electrical power generation or distribution systems, said transducer generating a transducer output signal representative of said electrical characteristic, wherein a) the current carrying element generates a magnetic field, b) the magnetic field transducer is a coil having an air core producing substantially no magnetic nonlinearities when the coil is in the magnetic field, and c) the transducer output signal is transduced from said magnetic field; an amplifier receiving said transducer output signal and generating an amplifier output signal; a filter receiving said amplifier output signal, low pass filtering said amplifier output signal, and generating a filter output signal; an analog to digital converter receiving said filter output signal and generating a digital output signal; and a processor receiving said digital output signal, calculating phasor data from said digital output signal and generating a data output signal, wherein said calculated phasor data is at least as accurate as phasor data from a phasor measurement unit or a frequency data recorder having a transducer for nontransduction measurement of the same electrical characteristic.