Prohlížení Publikační činnost ČVUT dle autora "Draxler K."

Zobrazují se záznamy 1-9 z 9

    • AC/DC Current Transformer With Single Winding 

      Autor: Ripka P.; Draxler K.; Styblíková R.
      (IEEE, 2014)
      AC/DC Current Transformer With Single Winding is a device which allows simultaneously measure AC and DC current using fluxgate effect

    • Calibration of burdens for instrument transformers 

      Autor: Draxler K.; Ulvr M.; Styblikova R.; Hlaváček J.
      (IEEE, 2020)
      The first part of this paper deals with the influence of burden accuracy on the errors of current and voltage instrument transformers. The requirement stated in the prepared standard, corresponding to a tolerance of burden ...

    • Calibration of unipolar high current impulses for resistance spot welding 

      Autor: Hlaváček J.; Kněnický M.; Draxler K.
      (Czechoslovakia Section IEEE, 2020)
      Requirement from practice is the need for quality and precise measurement of unipolar high current impulses, which are applied in resistance spot welding. The reason is the high dependence of weld quality on the shape and ...

    • DC-Compensated Current Transformer 

      Autor: Ripka P.; Draxler K.; Styblíková R.
      (Molecular Diversity Preservation International, 2016)
      Instrument current transformers (CTs) measure AC currents. The DC component in the measured current can saturate the transformer and cause gross error. We use fluxgate detection and digital feedback compensation of the DC ...

    • Demagnetization of Current Transformers Using PWM Burden 

      Autor: Bauer J.; Ripka P.; Draxler K.; Styblíková Renata
      (IEEE, 2015)
      Current transformers (CTs) show large errors when they are magnetized by dc current. This error can be reduced after proper demagnetization. One of the methods to demagnetize the CT is to increase the core flux by increasing ...

    • Determination of instrument current transformer errors in frequency range up to 1 kHz 

      Autor: Draxler K.; Hlaváček J.; Styblikova R.
      (The Institute of Measurement and Control, 2018)
      Two procedures for determining instrument current transformer (ICT) errors in the specified frequency range are described in the paper. The basis is use of accurate, frequency independent resistors, the ratio of which ...

    • A Fluxgate Current Sensor With an Amphitheater Busbar 

      Autor: Ripka P.; Přibil M.; Petrucha V.; Grim V.; Draxler K.
      (IEEE, 2016)
      Large dc and ac electric currents are often measured by open-loop sensors without a magnetic yoke. A widely used configuration uses a differential magnetic sensor inserted into a hole in a flat busbar. The use of a ...

    • Measurement of DC Currents in the Power Grid by Current Transformer 

      Autor: Ripka P.; Draxler K.; Styblíková R.
      (IEEE, 2013)
      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, ...

    • Results of an International Comparison of Instrument Current Transformers up to 10 kA at 50 Hz Frequency 

      Autor: Draxler K.; Styblikova R.; Hlaváček J.; Rietveld G.
      (IEEE Instrumentation and Measurement Society, 2018)
      Traceability of the current ratio is crucial for the measurement of electrical energy in revenue metering. A comparison of the AC current ratio was therefore performed within EURAMET in the time period 2012-2016, using a ...