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Low Power Contactless Voltage Sensor for Low Voltage Power Systems
Antonio Delle Femine1, Daniele Gallo1, Carmine Landi1
1Department of Engineering, University of Campania "Luigi Vanvitelli", 81031 Aversa (CE), Italy.
Sensors (Basel, Switzerland)
|August 14, 2019
Summary
This study introduces a novel contactless voltage sensor for low voltage power systems. The developed sensor offers high accuracy and low power consumption, ideal for applications requiring minimal cabling.
Area of Science:
- Electrical Engineering
- Sensor Technology
- Power Systems
Background:
- Contactless measurements are crucial in scenarios with limited or impossible cabling.
- Existing methods may face challenges in low voltage power systems.
Purpose of the Study:
- To develop and characterize a new contactless voltage sensor for low voltage power systems.
- To ensure minimal power consumption and high accuracy.
Main Methods:
- A contactless capacitive probe with concentric electrodes was designed.
- A low-power analog conditioning circuit utilizing rail-to-rail operational amplifiers was employed.
- The sensor was tested with various signal types, frequencies, and harmonic distortions.
Main Results:
- The sensor demonstrated high accuracy (less than 0.3%) within the 100 V to 300 V range.
- Power consumption was measured to be less than 5 mW.
- The influence of power cable current on voltage measurement was evaluated.
Conclusions:
- The developed contactless voltage sensor is suitable for low voltage power systems.
- The sensor provides accurate measurements with minimal power draw.
- It addresses the need for reliable sensing in cabling-restricted environments.
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