Measurement of DC Currents in the Power Grid by Current Transformer
Type of document
článek v časopisejournal article
Peer-reviewed
acceptedVersion
Author
Ripka P.
Draxler K.
Styblíková R.
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openAccessMetadata
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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.
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