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Energies 2019, 12(7), 1405; https://doi.org/10.3390/en12071405

Accuracy and Reliability of Switching Transients Measurement with Open-Air Capacitive Sensors

1
Department of Electrical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600MB Eindhoven, The Netherlands
2
DNV GL, P.O. Box 9035, 6800ET Arnhem, The Netherlands
*
Author to whom correspondence should be addressed.
Received: 21 March 2019 / Revised: 8 April 2019 / Accepted: 10 April 2019 / Published: 11 April 2019
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Abstract

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. View Full-Text
Keywords: air capacitive sensors; power system transients; high-voltage measurements; high-voltage monitoring air capacitive sensors; power system transients; high-voltage measurements; high-voltage monitoring
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Barakou, F.; Steennis, F.; Wouters, P. Accuracy and Reliability of Switching Transients Measurement with Open-Air Capacitive Sensors. Energies 2019, 12, 1405.

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