G - Physics – 01 – R
Patent
G - Physics
01
R
324/70
G01R 21/06 (2006.01) G01R 19/02 (2006.01) G01R 21/00 (2006.01) G01R 21/133 (2006.01)
Patent
CA 1221418
ABSTRACT The electric parameter metering machine comprises electric parameter pickup circuitry for sensing the instantaneous analog amplitude value of an electric parameter waveform in at least one phase in an electric power distribution system at selected time intervals during each full cycle, an A/D converter for converting the analog amplitude values to digital signals and signal processing circuitry including a memory for storing the digital signals. The signal processing circuitry includes a microprocessor operable to apply a conventional waveform analysis technique to the digital signal information collected with respect to a selected number of cycles of the electric parameter waveform to obtain an instantaneous RMS value of the electric parameter and operable to process a sequence of instantaneous RMS electric parameter values at discrete time intervals to obtain time averaged or demand electric parameter values. A visual display device is coupled to the signal processing circuitry and a pushbutton control panel is coupled to the signal processing circuitry for enabling an operator to operate pushbuttons to provide a digital readout of either instantaneous RMS, demand, or peak demand values on the visual display device.
446240
Gilker Clyde
Nohria Naresh K.
Mcgraw-Edison Company
Shapiro Cohen
LandOfFree
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