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相关概念视频

Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

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Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
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Galvanometer01:25

Galvanometer

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Common devices, including car instrument panels, battery chargers, and inexpensive electrical instruments, measure potential difference (voltage), current, or resistance using a d'Arsonval galvanometer. This electromechanical instrument is also known as a moving coil galvanometer.
The galvanometer consists of  two concave-shaped permanent magnets, providing a uniform radial magnetic field in the annular region. In the center, a pivoted coil of fine copper wire is placed in the uniform...
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Calculation of Self-inductance01:29

Calculation of Self-inductance

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The self-inductance of a circuit, often simply called the inductance, is a purely geometric factor that depends only on the circuit component's structure. More specifically, it depends on the shape and size of the component that lets the flux pass through it, thus inducing an electric field that opposes any current passing through it.
Since the effect of the induced electric field and the back EMF generated depends on the rate of change of current and the self-inductance, the inductance...
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Magnetic Force On Current-Carrying Wires: Example01:22

Magnetic Force On Current-Carrying Wires: Example

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In a magnetic field, moving charges encounter a force. If a wire contains these moving charges, i.e., if the wire is carrying a current, then a force acts on the wire as well. Consider a pair of flexible leads holding a wire that is 40 cm long and 10 g in weight in a horizontal position. The wire is placed in a constant magnetic field of 0.40 T, as shown in Figure 1(a). Determine the magnitude and direction of the current flowing in the wire needed to remove the tension in the supporting leads.
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Controlled-Current Coulometry: Overview01:27

Controlled-Current Coulometry: Overview

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Controlled current coulometry, also known as amperostatic coulometry, is a technique used in electrochemical analysis to measure the quantity of a substance through the controlled passage of current. It involves the application of a constant current to an electrochemical cell containing the analyte of interest. As the current flows through the cell, the analyte undergoes a redox reaction at the electrode surface, resulting in a charge transfer. By monitoring the time required for a certain...
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Potentiometer01:30

Potentiometer

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Voltage and current measurements using a standard voltmeter and ammeter alter the circuit being measured either by drawing or resisting the current flow, which introduces uncertainties in the measurements. Null measurements balance the voltages so that no current flows through the measuring device and, therefore, no alterations occur in the measured circuit.
Suppose the emf of a battery needs to be measured. If the battery is directly connected to a standard voltmeter, the measured quantity is...
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Quantifying the Relative Thickness of Conductive Ferromagnetic Materials Using Detector Coil-Based Pulsed Eddy Current Sensors
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使用基于低频衰减反集成电路的罗戈夫斯基线圈的闪电电流测量方法.

Yiping Xiao1,2, Hongjian Jiao1, Feng Huo3

  • 1School of Electrical and Electronic Engineering, Hubei University of Technology, Wuhan 430068, China.

Sensors (Basel, Switzerland)
|August 10, 2024
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概括

这项研究引入了一种新的Rogowski线圈方法,用于准确测量输电线路上的闪电电流. 该技术有效地纠正低频扭曲,改善用于关键电气基础设施监控的波形恢复.

关键词:
罗戈夫斯基线圈是一个Rogowski线圈.整体纠正纠正是一个完整的纠正.闪电电流测量测量方法低频衰减反网络的低频衰减反网络低频扭曲是低频的扭曲.

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科学领域:

  • 电气工程 电气工程
  • 电磁学 电磁学 电磁学 电磁学
  • 测量科学 测量科学 测量科学

背景情况:

  • 罗戈夫斯基线圈用于输电线路上的闪电电流测量.
  • 低频扭曲是这些测量中的一个重大挑战,影响精度.
  • 现有的方法很难有效地纠正这种扭曲.

研究的目的:

  • 开发和验证一种新的基于Rogowski线圈的雷电流测量方法.
  • 为了解决和纠正Rogowski线圈测量中固有的低频扭曲.
  • 为了提高闪电电流波形恢复的准确性和可靠性.

主要方法:

  • 使用频域分析对罗戈斯基线圈测量中低频扭曲原因的分析.
  • 设计一个优化的集成电路,具有低频衰减反来纠正扭曲.
  • 整合高通过和电压分割采样电路,以提高系统性能.
  • 选择组件和操作放大器 (op-amps) 来扩大测量带宽.

主要成果:

  • 拟议的方法有效地纠正了闪电电流测量的低频扭曲.
  • 最低测量频率极限已成功扩展至20 Hz.
  • 实现了测量的闪电电流波形的准确恢复.
  • 低频噪声和操作放大器直流偏差对集成电路的影响减少.

结论:

  • 开发的具有低频衰减反的Rogowski线圈测量方法显著提高了闪电电流测量的准确性.
  • 该技术为克服输电线路监控中低频扭曲挑战提供了可靠的解决方案.
  • 增强的测量系统提供精确的波形恢复,这对于电力系统的保护和分析至关重要.