Accuracy and reliability of switching transients measurement with open-air capacitive sensors

F. Barakou, Fred Steennis, Peter Wouters (Corresponding author)

Research output: Contribution to journalArticleAcademicpeer-review

5 Citations (Scopus)
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Contactless capacitive (open-air) sensors are applied to monitor overvoltages near overhead line terminations at a substation or at the transition from underground cables to overhead lines. It is shown that these sensors, applied in a differentiating/integrating measuring concept, can result in excellent characteristics in terms of electromagnetic compatibility. The inherent cross-coupling from open-air sensors to other phases is dealt with. The paper describes a method to calibrate the sensor to line coupling matrix based on assumed 50 Hz symmetric phase voltages and in particular focuses on uncertainty analysis of assumptions made. Network simulation shows that predicted maximum overvoltages agree within typically 7% compared to reconstructed values from measurement, also with significant cross-coupling. Transient voltages from energization of an (extra-)high voltage connection can cause large and steep rising ground currents near the line terminations. Comparison with results obtained by a capacitive divider confirms the intrinsic capability in interference rejection by the differentiating/integrating measurement methodology. Full article
Original languageEnglish
Article number1405
Number of pages12
Issue number7
Publication statusPublished - 1 Apr 2019
Event2018 IEEE International Conference on High Voltage Engineering and Application, ICHVE 2018 - Athens, Greece
Duration: 10 Sept 201813 Sept 2018

Bibliographical note

(This article belongs to the Special Issue Selected Papers from 2018 IEEE International Conference on High Voltage Engineering (ICHVE 2018))


  • Air capacitive sensors
  • High-voltage measurements
  • High-voltage monitoring
  • Power system transients
  • power system transients
  • air capacitive sensors
  • high-voltage measurements
  • high-voltage monitoring


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