Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Patent
1977-01-07
1977-11-15
Kominski, John
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural inputs
324127, G01R 1132
Patent
active
040587681
ABSTRACT:
A two-way electronic kWh meter is disclosed for metering electrial power and energy consumption in a single phase or polyphase electrical system wherein power and energy may be imported to the system or exported from the system to another system. Pairs of analog signals representing current and voltage variables are derived. Each pair of analog signals is multiplied together to derive partial instantaneous power signals. These signals are summed and integrated to thereby provide a signal which is proportional to the total energy being imported or exported with respect to the electrical system. The output of the integrator is converted to a pulse train having each pulse proportional to the energy being imported or exported with respect to the system. The partial instantaneous power signals are also summed and averaged, with the polarity of the resulting signal being detected by a polarity detector. Depending upon the polarity of the signal being detected, an import or export record and display arrangement is connected to receive the pulse train to record the quantity of energy being imported or exported with respect to the system. An error correction system is also provided, wherein the phasing of the voltage variable signals and the phasing of the polarity detector is switched each time an output pulse is generated.
REFERENCES:
patent: 3875509 (1975-04-01), Milkovic
patent: 3886449 (1975-05-01), Wolfinger
patent: 3975682 (1976-08-01), Mayfield
patent: 3976942 (1976-08-01), Mayfield
Brunson Robert E.
General Electric Company
Kominski John
Schlamp Philip L.
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