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Study of Current Measurement Method Based on Circular Magnetic Field Sensing Array.
Zhenhua Li1,2, Siqiu Zhang3, Zhengtian Wu4
1College of Electrical Engineering & New Energy, China Three Gorges University, Yichang 443002, China. lizhenhua1993@163.com.
Sensors (Basel, Switzerland)
|May 9, 2018
Summary
This study introduces a novel circular magnetic field sensing array for accurate direct current (DC) measurements, overcoming limitations of traditional transformers. The new method significantly reduces measurement errors, enhancing the reliability of protection and control systems.
Area of Science:
- Electrical Engineering
- Instrumentation and Measurement
Background:
- Traditional core-based instrument transformers suffer from magnetic saturation, limiting accuracy for large direct current (DC) measurements.
- Measurement errors in DC can lead to malfunctions in protection and control systems.
Purpose of the Study:
- To present a more accurate current measurement method using a circular magnetic field sensing array.
- To address the limitations of existing instrument transformers in DC measurement applications.
Main Methods:
- Utilized a circular array of multiple, evenly distributed Hall sensors.
- Calculated the average value from all Hall sensors for final measurement.
- Developed a calculation model accounting for parallel wire magnetic field interference.
- Implemented a Hall sensor compensation method for off-center primary conductors.
Main Results:
- Error significantly decreases with more than 8 Hall sensors (n > 8).
- Measurement error below 0.06% achieved when wire spacing exceeds 2.5 times the sensor array radius.
- System measurement error demonstrated to be less than 0.1% through simulation and testing.
Conclusions:
- The proposed circular magnetic field sensing array offers a highly accurate method for DC current measurement.
- The system effectively mitigates errors caused by magnetic saturation and external interference.
- This approach enhances the reliability of electrical measurement and control systems.
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