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
052988562
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 nonfundamental 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. (no month).
IEEE Guide for Harmonic Control and Reactive Compensation of Static Power Converters, ANSI/IEEE Std 519-1981. (no month).
Grady W. Mack
McEachern Alexander
Basic Measuring Instruments
Karlsen Ernest F.
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