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
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Czech description
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Classification
Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
JA - Electronics and optoelectronics
OECD FORD branch
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Result continuities
Project
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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
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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
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