Electronic kWh meter having virtual ground isolation

Details Electronic kWh meter having virtual ground isolation Electronic kWh meter having virtual ground isolation

1977-01-07

1978-05-30

Kominski, John

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Plural inputs

324140R, G01R 2106

Patent

active

040925927

ABSTRACT:
An electronic kWh meter is disclosed which measures electrical energy consumed in an electrical system. A current transformer generates an analog voltage which is proportional to a current in the electrical system. An operational amplifier has an input resistor connected across the load impedance of the electrical system and has a feedback resistor connected across the input and output of the amplifier. The input resistance of the amplifier is very small compared to the resistance of the input resistor to thereby virtually isolate the operational amplifier from the electrical system. The operational amplifier generates an output signal which is proportional to the voltage across the load impedance in the electrical system. The inphase components of the voltage and current are multiplied to provide a signal which is proportional to the instantaneous power in the system. This signal is converted to a pulse train wherein each pulse represents a quantized amount of energy consumed within the system. The pulse train is accumulated, recorded, and a display is provided for indicating the energy being consumed within the system. Both single phase and polyphase embodiments of the meter are described.

REFERENCES:
patent: 3875509 (1975-04-01), Milkov ic
patent: 3953795 (1975-04-01), Brunner
patent: 3976941 (1976-08-01), Milkovic
patent: 3976942 (1976-08-01), Mayfield

Affiliated with

Also associated with

Rating

Electronic kWh meter having virtual ground isolation does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Electronic kWh meter having virtual ground isolation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electronic kWh meter having virtual ground isolation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-471581