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. Full article
Original language | English |
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Article number | 1405 |
Number of pages | 12 |
Journal | Energies |
Volume | 12 |
Issue number | 7 |
DOIs | |
Publication status | Published - 1 Apr 2019 |
Event | 2018 IEEE International Conference on High Voltage Engineering and Application, ICHVE 2018 - Athens, Greece Duration: 10 Sept 2018 → 13 Sept 2018 |
Bibliographical note
(This article belongs to the Special Issue Selected Papers from 2018 IEEE International Conference on High Voltage Engineering (ICHVE 2018))Funding
Funding: This research was funded by TenneT TSO B.V. within the framework of the Randstad380 cable research project.
Keywords
- Air capacitive sensors
- High-voltage measurements
- High-voltage monitoring
- Power system transients
- power system transients
- air capacitive sensors
- high-voltage measurements
- high-voltage monitoring