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Measurement of DC Currents in the Power Grid by Current Transformer

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21230%2F13%3A00201572" target="_blank" >RIV/68407700:21230/13:00201572 - isvavai.cz</a>

  • Alternative codes found

    RIV/00177016:_____/13:#0000802 RIV/00177016:_____/12:#0001070

  • Result on the web

    <a href="http://ieee.org" target="_blank" >http://ieee.org</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1109/TMAG.2012.2216862" target="_blank" >10.1109/TMAG.2012.2216862</a>

Alternative languages

  • Result language

    angličtina

  • Original language name

    Measurement of DC Currents in the Power Grid by Current Transformer

  • Original language description

    DC currents in power grids are mainly caused by geomagnetic activity especially during magnetic storms. It is desirable to monitor these currents to prevent saturation of transformers, which may cause blackout. However, adding DC current sensors to existing installations would be very costly.We suggest to convert some of the existing current transformers to fluxgate DC current sensors by injecting AC excitation current into their secondary winding. We successfully tested this concept on 500 A current transformer. The achievable accuracy is 10% for DC currents and 1.5% for AC currents, which is sufficient for protection and monitoring purposes.We analyze the DC current sensitivity dependence on the (changing) grid impedance, and we show that the sensitivity can be stabilized by controlling the secondary voltage component at the excitation frequency. Excitation current injected into the grid also depends on the grid impedance, but for realistic conditions it is below 2 A.

  • Czech name

  • Czech description

Classification

  • Type

    J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

  • CEP classification

    JA - Electronics and optoelectronics

  • OECD FORD branch

Result continuities

  • Project

  • Continuities

    I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Others

  • Publication year

    2013

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    IEEE Transactions on Magnetics

  • ISSN

    0018-9464

  • e-ISSN

  • Volume of the periodical

    49

  • Issue of the periodical within the volume

    1

  • Country of publishing house

    US - UNITED STATES

  • Number of pages

    4

  • Pages from-to

    73-76

  • UT code for WoS article

    000312831300020

  • EID of the result in the Scopus database