Practical frequency response characterization of a test circuit for partial discharge measurements

Research output: Contribution to journalArticleScientificpeer-review

Abstract

When digitally acquiring partial discharge (PD) signals, the bandwidth, the parameters of the measuring circuit and the arrangement of the test set-up play a role in preventing the signals from being affected by oscillations, distortions and noise. In this paper, a compact design of test set-up for PD measurements and a method for characterization of the frequency response of the measuring circuit is proposed. The frequency characterization was based on the induction of a fast current pulse in the closed HV loop of the measuring circuit. Frequency domain analysis and the use of a RLC model led to a practical estimation of the circuit inductance L. Experimental results showed that the resonance produced by the circuit inductance and the combined capacitance of the test object and the coupling capacitor C can produce resonance peaks within the bandwidth of the measuring PD sensor, which results in large oscillations. In addition, it was shown that adding a critical resistance Rc damps the oscillations, thus reducing the error in parameter computation.

Original languageEnglish
Article number8424393
Pages (from-to)1535-1544
Number of pages10
JournalIEEE Transactions on Dielectrics and Electrical Insulation
Volume25
Issue number4
DOIs
Publication statusPublished - 2018

Keywords

  • calibration
  • damping
  • frequency response
  • oscillation
  • partial discharge
  • resonance

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