Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Patent
1991-10-08
1995-02-21
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural inputs
364483, G01R 2106
Patent
active
053919831
ABSTRACT:
A digital solid state electric power usage meter for determining power usage by a load attached to an electric power network. The meter has a current sensor coupled to each phase of the electric power network for sensing current in each phase, a voltage divider coupled to each phase of the power network for detecting the voltage level on each phase, an analog to digital (A/D) converter coupled to the current sensors and voltage dividers receiving signals from the current sensors related to the current in each phase and signals from the voltage dividers related to the voltage on each phase. The A/D converter samples the current and voltage related signals at predetermined times at a rate which insures that samples of the current and voltage related signals do not repeat for a large number of cycles of the network frequency or never repeat and which rate is at least twice as fast as the rate of change of the current and voltage related signals and converts the samples to digital signals representing the voltage levels and current at the predetermined times. A processor calculates instantaneous values of power at the predetermined times from the digital signals and a memory accumulates the instantaneous values so as to form a value representative of electric power usage by the load attached to the network.
REFERENCES:
patent: 3984737 (1976-10-01), Okamura
patent: 4077061 (1978-02-01), Johnston et al.
patent: 4174499 (1979-11-01), Waurick
patent: 4300125 (1981-11-01), Loshing et al.
patent: 4356553 (1982-10-01), Steinle et al.
patent: 4509128 (1985-04-01), Coppola et al.
patent: 4713608 (1987-12-01), Catiller et al.
patent: 4978911 (1990-12-01), Perry et al.
patent: 5216357 (1993-06-01), Coppola et al.
"Dithering Increases Dynamic Range and Improves Linearity", Federal Scientific Corporation, Aug. 24, 1973.
"Digital Wattmeter Using a Sampling Method", Turgel, Raymond S., IEEE Transactions of Instrumentation and Measurement, vol. IM-23, No. 4, Dec. 1974.
Lusignan Bruce B.
Rezvani Behruz
K C Corp.
Karlsen Ernest F.
LandOfFree
Solid state electric power usage meter and method for determinin does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Solid state electric power usage meter and method for determinin, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Solid state electric power usage meter and method for determinin will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1933449