A Digital Three-Phase Watthour Meter

Heikki Seppä, Pekka Talja, Olavi Blomberg, Markku Kallunki, Seppo Vehviläinen

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review


    A microprocessor-controlled three-phase digital watthour meter is described. The wattmeter is based on a sampling method and on an analog-to-digital (A/D) conversion; only one 10-b A/D converter, integrated in a microprocessor, is used. The resolution of the converter is improved by superimposing noise on current and voltage signals, and its uncertainty is reduced via an external resistive voltage divider. A wide current range is achieved by passing voltage signals. proportional to input currents, through a programmable-gain amplifier. The overall uncertainty of the meter is less than 0.1%. A block diagram of the wattmeter is presented.
    Original languageEnglish
    Title of host publicationCPEM'90 Digest
    Subtitle of host publicationConference on Precision Electromagnetic Measurements
    EditorsGary R. Hanes
    Place of PublicationNew York
    PublisherIEEE Institute of Electrical and Electronic Engineers
    Publication statusPublished - 1990
    MoE publication typeA4 Article in a conference publication
    EventCPEM'90: Conference on Precision Electromagnetic Measurements - Ottawa, Canada
    Duration: 11 Jul 199014 Jul 1990




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