High accuracy ac electric energy metering system

Details High accuracy ac electric energy metering system High accuracy ac electric energy metering system

G - Physics

01

R

324/29, 324/58.2

G01R 19/25 (2006.01) G01R 11/00 (2006.01) G01R 21/00 (2006.01) G01R 21/133 (2006.01)

Patent

CA 1180760

27 ABSTRACT OF THE DISCLOSURE An input module and a sample and hold circuit cooperate to produce sample values representative of the instantaneous magnitudes of three-phase line voltages and line currents delivered to a load by a power distribution system. The sample values representative of the line voltages are input directly to a multiplexer. The sample values representative of the line currents are input to the multiplexer both directly and through ranging ampli- fiers. When the sample values of the line currents are below a predetermined magnitude, the sample values ampli- fied by the ranging amplifiers are used, thus increasing the accuracy of the metering system. The sample values are input to an analog-to-digital converter where the sample values are digitized. A control circuit calculates a plurality of indica of the AC electric energy quantity delivered to the load from the digitized data. An output module is responsive to the control circuit for display- ing, recording or transmitting the calculated indica. A timing circuit times out a predetermined sample timer interval. At the end of the interval the control circuit produces new sample values and resets the timing circuit. The timing circuit is constructed so as to recognize a plurality of failure modes of the control circuit and reset the control circuit in response thereto thus improv- ing the reliability of the metering system.

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