Patent ID: 11906557
Assignee: SCHWEITZER ENGINEERING LABORATORIES, INC.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 9:
10. A method comprising:
obtaining, via an intelligent electronic device (IED), electrical measurements of an input signal of a power system, wherein the electrical measurements are obtained at a sampling frequency and the input signal is indicative of an operating frequency of the power system;
generating an intermediate signal by multiplying the input signal with quadrature signals, wherein the intermediate signal has a direct current (DC) component indicative of a magnitude and a phase of the input signal;
storing the intermediate signal comprising in phase and quadrature components in a first-in-first-out (FIFO) buffer; and
filtering, via the IED, the intermediate signal using an adjustable length rounded-corner boxcar filter comprising a plurality of taps to generate the magnitude and the phase of the input signal, wherein a length of the adjustable length rounded-corner boxcar filter varies based at least in part on a period measurement of the power system, and wherein end taps of the plurality of taps are interpolated to a lesser value than all other taps of the plurality of taps.