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Related Concept Videos

Finding Electric Potential From Electric Field01:13

Finding Electric Potential From Electric Field

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For a system of charges, it is easy to calculate the system's potential because potential is a scalar quantity. However, in some instances where calculating the electric field is more straightforward than finding the potential, the electric field is used to calculate the system's potential. For a positive charge, the electric field is radially outward, and the potential is positive at any finite distance from the positive charge. In such an electric field, the motion away from the...
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Induced Electric Fields: Applications01:27

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An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
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Determining Electric Field From Electric Potential01:12

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The electric field and electric potential are related to each other. If the electric field at various points in the region of interest is known, it can be used to calculate the electric potential difference between any two points. Similarly, if the electric potential is known for various points, then it is possible to calculate the electric field.
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Induced Electric Fields01:23

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The fact that emfs are induced in circuits implies that work is being done on the conduction electrons in the wires. What can possibly be the source of this work? We know that it’s neither a battery nor a magnetic field, as a battery does not have to be present in a circuit where current is induced, and magnetic fields never do any work on moving charges. The source of the work is in fact an electric field that is induced in the wires. For example, if a stationary conductor is placed in a...
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Electric Field01:16

Electric Field

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Consider two point charges, each exerting Coulomb force on the other. It is possible to describe the Coulomb interaction via an intermediate step by defining a new physical quantity called the electric field.
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Electric Field of Two Equal and Opposite Charges01:30

Electric Field of Two Equal and Opposite Charges

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Atoms generally contain the same number of positively and negatively charged particles, protons, and electrons. Hence, they are electrically neutral. However, the centers of the positive and negative charges do not always coincide. In such a scenario, the electric field of an atom may not be zero.
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Development of Whispering Gallery Mode Polymeric Micro-optical Electric Field Sensors
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Non-Contact Adaptive Voltage Sensor Based on Electric Field Coupling Principle.

Xiangyu Tan1, Wenbin Zhang2, Mingxing He3

  • 1Electric Power Research Institute, Yunnan Power Grid Co., Ltd., Kunming 650217, China.

Sensors (Basel, Switzerland)
|October 14, 2023
PubMed
Summary

This study introduces an improved non-contact voltage sensor that enhances accuracy and low-frequency performance. The novel design, featuring an equipotential ring and parallel capacitors, achieves a measurement error within ±3%.

Keywords:
electric field couplingnon-contact voltage measurementself-adaptionvariable voltage division ratio

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Area of Science:

  • Electrical Engineering
  • Sensor Technology

Background:

  • Non-contact voltage sensors utilize electric field coupling for safe, insulation-independent measurements.
  • Traditional sensors face errors due to edge effects and exhibit poor low-frequency performance with low voltage division ratios.

Purpose of the Study:

  • To design and validate an improved non-contact voltage sensor with enhanced accuracy and adaptability.
  • To address measurement errors caused by edge effects and improve low-frequency characteristics.

Main Methods:

  • Developed a non-contact voltage measurement model based on capacitive voltage sharing.
  • Incorporated an equipotential ring to mitigate edge effects and parallel ceramic capacitors to boost sensor capacitance.
  • Integrated a switchable capacitor system for adjustable voltage division ratios.

Main Results:

  • The equipotential ring effectively eliminated edge effect-induced capacitance errors.
  • Paralleling capacitors significantly improved low-frequency performance and increased the voltage division ratio.
  • The sensor prototype demonstrated good linearity and high accuracy, with a ratio error within ±3%.

Conclusions:

  • The proposed sensor design effectively overcomes limitations of traditional non-contact voltage sensors.
  • The equipotential ring and adjustable capacitance provide a robust and adaptable solution for accurate voltage measurement.