Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Patent
1980-11-03
1984-07-10
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural inputs
328160, 364483, 364841, G01R 2106, G06G 716
Patent
active
044595468
ABSTRACT:
An electronic meter is disclosed, for measuring functions such as power and energy of an alternating current and voltage. For measuring electrical energy, the meter includes an analog integrator for computing the integral of the voltage and of the current over a selected period of the voltage waveform. Means including a digital microprocessor and a comparison circuit are provided for generating a voltage level equal to the magnitude of the current integral or the voltage integral. In this manner, the microprocessor determines the value of the voltage or current integral. Since the integral of a sinusoidal waveform is related to its amplitude and to the power factor, the microprocessor can make a computation of energy from the values of the voltage and current integrals.
REFERENCES:
patent: 4282576 (1981-08-01), Elms et al.
Depping et al; "Electrical Energy Meter . . . "; Electronics to Microelectronics; Fourth European Conference on Electrotechnics; Eurocon '80; Stuttgart, Germany; Mar. 24-28, 1980.
Kuppurajulu et al; "A Fast Response . . . "; IEEE Trans. on Power Apparatus and Systems; vol. PAS-90; No. 1; Jan./Feb. 1971; pp. 331-338.
Stockton, J. R.; "Proposed Quarter Squares . . . "; Electronics Letters; vol. 16; No. 21; Oct. 9, 1980; pp. 819-820.
Burton et al; "Linear and Nonlinear . . . "; IEEE Trans. on Instrum. and Meas.; vol. IM-24; No. 3; Sep. 1975; pp. 201-205.
Arrington Robert A.
Nelson Richard A.
Thomas James L.
Greenberg Howard R.
Hamann H. Fredrick
Karlsen Ernest F.
Rockwell International Corporation
Sewell V. Lawrence
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