Principles of Charge Estimation Methods Using High-Frequency Current Transformer Sensors in Partial Discharge Measurements

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Abstract

This paper describes a simplified model and a generic model of high-frequency current transformer (HFCT) sensors. By analyzing the models, a universal charge estimation method based on the double time integral of the measured voltage is inferred. The method is demonstrated to be valid irrespective of HFCT sensor, assuming that its transfer function can be modelled as a combination of real zeros and poles. This paper describes the mathematical foundation of the method and its particularities when applied to measure nanosecond current pulses. In practice, the applicability of the method is subjected to the characteristics and frequency response of the sensor and the current pulse duration. Therefore, a proposal to use the double time integral or the simple time integral of the measured voltage is described depending upon the sensor response. The procedures used to obtain the respective calibration constants based on the frequency response of the HFCT sensors are explained. Two examples, one using a HFCT sensor with a broadband flat frequency response and another using a HFCT sensor with a non-flat frequency response, are presented.
Original languageEnglish
Article number2520
Pages (from-to)1-16
Number of pages16
JournalSensors
Volume20
Issue number9
DOIs
Publication statusPublished - 29 Apr 2020

Keywords

  • high-frequency current transformer
  • HFCT
  • Rogowski coils
  • magnetic loop antenna
  • partial discharge
  • PD
  • magnetically coupled sensors
  • charge estimation

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