Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Polyphase
Patent
1975-06-20
1980-08-12
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Polyphase
324111, 324142, G01R 2106, G01R 1116
Patent
active
042175453
ABSTRACT:
In a polyphase electric energy meter, voltages of the phases of a polyphase alternating power to be measured are utilized to subject an input pulse signal to be applied to a pulse distributor to pulse width modulation to form polyphase control pulses, which cyclically operate switches provided respectively for the phases so that an operation circuit cyclically receives the voltages and currents of the phases and produces a current output proportional to the sum of the electric powers of the phases.
REFERENCES:
patent: 2302474 (1942-11-01), Rich
patent: 2615063 (1952-10-01), Brown
patent: 2998569 (1961-08-01), Legatti et al.
patent: 3286178 (1966-11-01), Ultcht
patent: 3794917 (1974-02-01), Martin et al.
patent: 4092590 (1978-05-01), Watanabe
Ikeda Yoshio
Kusui Shoji
Yamazaki Nobuyasu
Karlsen Ernest F.
Nihon Denki Keiki Kenteisho
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