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High-Precision, Wide-Ratio, Self-Balancing Current Comparator.

Xue Wang1, He Li1, Hao Liu1

  • 1China Electric Power Research Institute, Wuhan 430074, China.

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Summary
This summary is machine-generated.

A new self-balancing current comparator overcomes magnetic and capacitive errors for high-precision current ratio calibration. This device achieves 0.0002 level accuracy, improving efficiency in electrical traceability systems.

Keywords:
automatic measurementcurrent comparatorself-balancingwide-ratiozero-flux

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Area of Science:

  • Electrical Metrology
  • Instrumentation and Measurement Science

Background:

  • Current proportional standard devices are crucial for current traceability.
  • Existing devices suffer from magnetic and capacitive errors, limiting performance.
  • High precision and wide variation ratios are desired for advanced calibration.

Purpose of the Study:

  • To develop a novel wide-variable-ratio self-balancing current comparator.
  • To address magnetic and capacitive errors in current proportional standard devices.
  • To enhance the efficiency and accuracy of current ratio calibration.

Main Methods:

  • Utilized the zero magnetic flux principle for current comparison.
  • Integrated electronic compensation technology with error analysis.
  • Developed a self-balancing mechanism for wide ratio transformations.
  • Conducted theoretical analysis and experimental calibration of error performance.

Main Results:

  • The new current comparator achieves accuracy meeting the 0.0002 level requirement.
  • Demonstrated high accuracy across a wide range of current ratios.
  • Successfully calibrated standard currents at 0.001 level and below.
  • Significantly improved work efficiency in current ratio calibration tests.

Conclusions:

  • The developed wide-variable-ratio self-balancing current comparator effectively mitigates magnetic and capacitive errors.
  • This innovation provides a solution for high-accuracy, high-efficiency wide-range current ratio calibration.
  • The device enhances the traceability system of current proportional values.