A method, to decompose the total instantaneous power, into active and non-active components, using the voltages and currents at the metering point; and apparatus implementing the said method. The voltage and currents are transformed into Fourier components. The Fourier currents are separated into active...http://www.google.com/patents/US8014964?utm_source=gb-gplus-sharePatent US8014964 - Electrical power and energy measurement method and apparatus
