Susceptibility of Static Energy Meters due to Amplifier Clipping Caused by a Rogowski Coil

Tom H.F. Hartman, Bas ten Have, Johan Dijkstra, Roelof Grootjans, Niek Moonen, Frank Leferink

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)
72 Downloads (Pure)

Abstract

Static energy meters installed in households, used for billing purposes of the energy consumption, have shown errors due to conducted electromagnetic interference coming from appliances in household situations. This resulted in over- and underestimations of the energy bill, and even in a perceived energy generation. The currents causing interference are known to be nonlinear pulsed currents with fast slopes. This article shows that clipping of the amplifier, following the Rogowski coil, which is used as the current sensing element, results in distorted energy measurements. Due to the pulsed nature of the current, the output of the Rogowski coil exceeds the maximum input voltage of the amplifier, resulting in clipping at the output of the amplifier. This clipped signal is then integrated in the digital chain, resulting in an offset in the perceived current. Hence, causing a higher or lower energy calculation, depending on the phase firing angle and the fastest edge of the pulse. It is found that parameters, such as the slew rate, rise and fall times, and firing angle, are correlated to the interference on static energy meters.
Original languageEnglish
Pages (from-to)2024-2032
Number of pages9
JournalIEEE transactions on electromagnetic compatibility
Volume64
Issue number6
Early online date26 Sept 2022
DOIs
Publication statusPublished - Dec 2022

Keywords

  • Amplifier
  • Clipping
  • Conducted
  • Electromagnetic Interference (EMI)
  • Nonlinear equipment
  • Phase firing angle
  • Pulsed currents
  • Rogowski coil
  • Static energy meter (SM)

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