Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Patent
1992-10-06
1994-03-29
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural inputs
364483, G01R 2106
Patent
active
052988554
ABSTRACT:
An electric power measuring system wherein power factor measurements are adjusted to reflect the adverse economic effects of harmonic currents and voltages. Well-known techniques are used to acquire frequency spectra that represent the voltages and currents present at the measuring point. These spectra are weighted in such a way that non-fundamental currents are increased and non-fundamental voltages are decreased. The weighted spectra are used to calculate a harmonic-adjusted volt-ampere measurement, which is then accumulated to form a harmonic-adjusted volt-ampere-hour measurement. The weighting functions for voltage and current are selected to approximate the economic impact on the AC power generating, transmission, and distribution system of non-fundamental currents and voltages. The resulting harmonic-adjusted volt-ampere-hour measurement is used to calculate a harmonic-adjusted power factor measurement.
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Recommended Practice for Establishing Transformer Capability when Supplying Nonsinusoidal Load Currents, ANSI/IEEE C57.110-1986.
IEEE Guide for Harmonic Control and Reactive Compensation of Static Power Converters, ANSI/IEEE Std 519-1981.
Grady W. Mack
McEachern Alexander
Basic Measuring Instruments
Karlsen Ernest F.
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