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Measurement of Transient Overvoltages by Capacitive Electric Field Sensors
Felipe L Probst1, Michael Beltle1, Stefan Tenbohlen1
1Institute of Power Transmission and High Voltage Technology (IEH), University of Stuttgart, 70569 Stuttgart, Germany.
Sensors (Basel, Switzerland)
|March 13, 2024
Summary
Accurate measurement of electromagnetic transients is crucial for power grids with renewable energy. A capacitive electric field sensor system and the coupling capacitance compensation (CCC) method offer a more suitable approach for transient overvoltage measurements.
Area of Science:
- Electrical Engineering
- Power Systems
Background:
- Increasing integration of renewable energy sources necessitates advanced measurement techniques for electromagnetic transients.
- Power electronics in renewable energy systems introduce novel transient phenomena.
- Broadband response measurement devices are essential for capturing fast transients.
Purpose of the Study:
- To present a capacitive electric field sensor-based system for measuring transient overvoltages in high-voltage substations.
- To validate the system's design and concept through laboratory testing.
- To compare two calibration techniques for transient overvoltage measurements.
Main Methods:
- Development and presentation of a capacitive electric field sensor measurement system.
- Validation of the system through high-voltage laboratory tests.
- Evaluation of two calibration methods: Simplified Method (SM) and Coupling Capacitance Compensation (CCC).
Main Results:
- The capacitive electric field sensor system was validated in a high-voltage laboratory.
- The Simplified Method (SM) was found to overestimate maximum overvoltages.
- The Coupling Capacitance Compensation (CCC) method proved more suitable for calibrating transient overvoltage measurements.
Conclusions:
- The presented capacitive electric field sensor system is a validated, efficient, and flexible solution for monitoring transient overvoltages.
- The CCC method is recommended over the SM for accurate calibration of transient overvoltage measurements.
- The system supports the reliable integration of renewable energy sources by enabling precise transient analysis.
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