发明名称 |
Harmonic-adjusted power factor meter |
摘要 |
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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申请公布号 |
US5298856(A) |
申请公布日期 |
1994.03.29 |
申请号 |
US19920957274 |
申请日期 |
1992.10.06 |
申请人 |
BASIC MEASURING INSTRUMENTS |
发明人 |
MCEACHERN, ALEXANDER;GRADY, W. MACK |
分类号 |
G01R21/00;(IPC1-7):G01R21/06 |
主分类号 |
G01R21/00 |
代理机构 |
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