Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Patent
1993-11-24
1996-05-14
Nguyen, Vinh P.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural inputs
324103R, 324107, G01R 1900
Patent
active
055171060
ABSTRACT:
A method and apparatus for digitally measuring electrical energy consumption parameters from a transmission line carrying alternating current. Current flowing in the conductor is sampled at multiple times which are independent of the current phase. Using an appropriate microcomputer, this sampled current is analytically filtered by expressing the current with Fourier Series using only selected harmonics thus eliminating those harmonics which define noise. An approximation of the power and power consumption is then computed by multiplying the current as expressed in Fourier Series and a voltage measurement from the conductor to obtain a power reading, and the power reading is summed to obtain a number value proportional to the energy consumption. Even harmonics and high frequency harmonics may be eliminated in the Fourier expression of the current derivative to further simplify computer computations and required hardware, and the magnetic rate of change pickup and the voltage pickup are preferably filtered to remove unwanted noise.
REFERENCES:
patent: 3727132 (1973-04-01), Antoniu et al.
patent: 4672555 (1987-06-01), Hart et al.
patent: 4709339 (1987-11-01), Fernandes
patent: 4931725 (1990-06-01), Hutt et al.
patent: 5061890 (1991-10-01), Longini
patent: 5300924 (1994-04-01), McEachern et al.
Digital KWH Inc.
Nguyen Vinh P.
LandOfFree
Method and apparatus for digitally measuring electrical power does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for digitally measuring electrical power, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for digitally measuring electrical power will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1898541