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Digital Measurement of Line Current with the Use of Virtual Short Circuit Method

Vladimir Vujicic, Aleksandar Radonjic, Dragana Naumovic-Vukovic, Nemanja Gazivoda, Platon Sovilj
  • Abstract:
    The paper describes a method of very accurate measurement of line current using a current transformer (CT) in a virtual short circuit. The key systematic error, amplified error due to offset of operational amplifier that leads CT in a virtual short circuit, is easily calculated using a stochastic digital measurement method and eliminated from measured RMS value of line current. Since the 2-bit stochastic digital measurement method is defined using a very simple hardware which has a small number of sources of systematic error, sources are easily identified and it is described how to eliminate these errors. A complete measurement scheme of line current is presented and applied in quadruple three-phase power analyser with MM4 type designation. MM4 is a key component of the redundant measuring system in the Electric Power Grid of Serbia.
  • Keywords:
    digital stochastic measurement, line current, current transformer
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  • DOI:
    _unreg_tc4-2017.051

Event details:

  • IMEKO TC:
    TC4
  • Event name:
    TC4 Symposium 2017
  • Title:

    22nd IMEKO TC4 Symposium and 20th International Workshop on ADC Modelling and Testing
    "Supporting world development through electric&electronic measurements"

  • Place:
    Iasi, ROMANIA
  • Time:
    14 September 2017 - 15 September 2017