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Development of a Wideband Precision Electric Field Measuring Sensor
Zhaozhi Long1,2, Feng Zhou2, Fuchang Lin1
1School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
Sensors (Basel, Switzerland)
|December 9, 2023
Summary
A new high-precision inductive wideband electric field measuring sensor (EFMS) accurately measures lightning-impulse voltage. This sensor is crucial for calibrating nonlinearity in ultra-high voltage impulse measurement devices.
Area of Science:
- Electrical Engineering
- Electromagnetics
- Measurement Science
Background:
- Traditional high-voltage electric field measurement technology has limitations in accuracy and bandwidth.
- These limitations prevent its use in measuring lightning-impulse voltage.
- Calibrating nonlinearity in MV-level lightning-impulse voltage measurement systems is essential.
Purpose of the Study:
- To design and implement a high-precision inductive wideband electric field measuring sensor (EFMS).
- To address the need for accurate lightning-impulse voltage measurement.
- To enable nonlinearity calibration of MV-level lightning-impulse voltage measurement systems.
Main Methods:
- Simulated the influence of a metal shell on electric field distribution.
- Studied the effect of the electric field non-uniformity coefficient.
- Tested the characteristics of the designed EFMS.
Main Results:
- The EFMS accurately reproduces lightning-impulse voltage and power-frequency voltage waveforms.
- Achieved a proportionality coefficient of 0.05664 V/(kV/m).
- Demonstrated nonlinearity less than ±0.25% for impulse voltage and 0.1% for power-frequency voltage.
Conclusions:
- The developed EFMS is suitable for nonlinearity calibration of ultra-high voltage impulse measurement devices.
- The sensor offers high precision and wideband capabilities for electric field measurement.
- The EFMS overcomes the limitations of existing technologies for impulse voltage measurement.
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