Abstract: Disclosed is a method for determining the distance to a fault location of a power line to be protected in an electric power system, the method including: configuring the power line to be protected into a plurality of segments, obtaining a plurality of line settings separately for each of the plurality of segments configured, and using the line settings obtained to determine a fault location of the power line to be protected, wherein the line settings include at least one of impedance, resistance, reactance, length, compensation factor, angle. Also disclosed is an intelligent electronic device.

Abstract: A method and system for measuring alternating-current system quantities through measurement connections producing frequency-dependent errors, in which method the analog signal of at least one measurement channel is sampled at a selected an approximately measured frequency fm at a multiple frequency fs, creating a base series depicting a period on each measurement channel, from each base series the fundamental frequency and the magnitude or phase-angle values or both of at least one harmonic frequency component are calculated with the aid of Fourier analysis or similar, each of which is corrected with the aid of a calibrated frequency-dependent function k(f), when the selected quantities are calculated from the calibrated values.

Abstract: A method and system for measuring alternating-current system quantities through measurement connections producing frequency-dependent errors, in which method the analog signal of at least one measurement channel is sampled at a selected an approximately measured frequency fm at a multiple frequency fs, creating a base series depicting a period on each measurement channel, from each base series the fundamental frequency and the magnitude or phase-angle values or both of at least one harmonic frequency component are calculated with the aid of Fourier analysis or similar, each of which is corrected with the aid of a calibrated frequency-dependent function k(f), when the selected quantities are calculated from the calibrated values.

Abstract: A method and system for measuring alternating-current system quantities through measurement connections producing frequency-dependent errors, in which method the analog signal of at least one measurement channel is sampled at a selected an approximately measured frequency fm at a multiple frequency fs, creating a base series depicting a period on each measurement channel, from each base series the fundamental frequency and the magnitude or phase-angle values or both of at least one harmonic frequency component are calculated with the aid of Fourier analysis or similar, each of which is corrected with the aid of a calibrated frequency-dependent function k(fn), when the selected quantities are calculated from the calibrated values.