Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Nonlinear
Patent
1984-06-15
1987-02-10
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Nonlinear
324111, 364483, 364734, G01R 1902
Patent
active
046425640
ABSTRACT:
A measuring circuit for obtaining a mean square value of a power distribution line paramter and a process for obtaining a mean square value is disclosed. The measuring circuit and process exploit my discovery that an accurate measurement of the mean square may be closely approximated by sampling the power parameter an odd number of times greater than one during the power parameter cycle. When the power parameter is sampled an odd number of times (N) during its cycle aliasing errors due to the existence of odd harmonics above the Nyquist Frequency are minimized. As a result, the means of the most recent N sample values squared is very nearly equal to the true mean square value which would be produced by a continuous integration of the square of the power parameter during its period divided by the period. By sampling at a relatively low frequency, errors and circuit complexity are reduced, and the speed with which an acceptable mean square value is obtained is increased.
REFERENCES:
patent: 3488482 (1970-01-01), Ley
patent: 3822401 (1974-07-01), Parker
patent: 4193118 (1980-03-01), Nash et al.
patent: 4242638 (1980-12-01), Glaser et al.
patent: 4245183 (1981-01-01), Glennon
patent: 4346346 (1982-08-01), Silverberg
patent: 4360880 (1982-11-01), Brodie et al.
patent: 4516008 (1985-05-01), Jones
Srinivasan, R. et al., "A Programmable Digital Signal Averager", J. Phys. E: Sci. Instrum., vol. 13, No. 12, Dec. 1980, pp. 1263-1265.
Matuoka, M., "A Wide-Range, Digital Power/Energy Meter . . . ", Conference: IAS Annual Mtg. 1980, pp. 838-849.
Depping, F. et al., "Electrical Energy Meter . . . ", Conference: From Electronics to Microelectronics, Fourth European Conf. on Electrotechnics--Eurocon '80.
Sim, L. et al., "A Microcomputer Based Signal Averaging System . . . ", Australasian Physical Sciences in Medicine, vol. 2-6, No. 83, Aug. 1979, pp. 340-345.
Kitas, R. et al., "Digital Instrumentation for the Time Integral of the Square of a Slowly Fluctuating Voltage", IEEE Trans. on Instrum and Meas., vol. 17, No. 3, Sep. 1968, pp. 177-185.
Baker Stephen M.
Blish Nelson A.
Cooper Industries Inc.
Eisenzopf Reinhard J.
Scott Eddie E.
LandOfFree
Measuring circuit and method for power distribution equipment does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Measuring circuit and method for power distribution equipment, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Measuring circuit and method for power distribution equipment will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2364803