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相关概念视频

Three-Phase Short Circuit—Unloaded Synchronous Machine01:21

Three-Phase Short Circuit—Unloaded Synchronous Machine

147
Conducting a three-phase short circuit test on an unloaded synchronous machine helps understand its impact on the system. The AC fault current's oscillogram, with the DC offset removed, reveals that the waveform amplitude decreases from an initially high value to a steady-state level for one phase of the machine.
This behavior occurs due to the magnetic flux produced by the short-circuit armature currents. Initially, these currents follow high-reluctance paths but eventually shift to...
147
Bus Impedance Matrix01:24

Bus Impedance Matrix

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Calculating subtransient fault currents for three-phase faults in an N-bus power system involves using the positive-sequence network. When a three-phase short circuit occurs at a specific bus, the analysis uses the superposition method to evaluate two separate circuits.
In the first circuit, all machine voltage sources are short-circuited, leaving only the prefault voltage source at the fault location. The positive-sequence bus impedance matrix can be determined by solving the nodal equations,...
122
Power System Three-Phase Short Circuits01:21

Power System Three-Phase Short Circuits

88
Determining the subtransient fault current in a power system involves representing transformers by their leakage reactances, transmission lines by their equivalent series reactances, and synchronous machines as constant voltage sources behind their subtransient reactances. In this analysis, certain elements are excluded, such as winding resistances, series resistances, shunt admittances, delta-Y phase shifts, armature resistance, saturation, saliency, non-rotating impedance loads, and small...
88
Three-Phase Circuits01:22

Three-Phase Circuits

412
AC power distribution systems have three categories: single-phase, two-phase, and three-phase systems. The single-phase circuit, common in residential settings, typically employs a two-wire system connecting a single AC source to various loads. These circuits support standard household appliances operating at 120 volts (V) and 240 V, such as lamps, televisions, and microwaves. The first generators, Niagara Falls hydro plant installed in 1895, were two-phase and designed by Nikola Tesla. The...
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Magnetic Force On Current-Carrying Wires: Example01:22

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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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Three-Phase Voltages01:30

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A three-phase generator produces three voltages that are equal in magnitude but have a phase difference of 120 degrees. This identical magnitude and equal phase separated voltages are known as the balanced voltages and help to minimize power loss while ensuring a steady delivery of energy to connected loads. As voltage sources in a three-phase system can be configured in a wye or a delta formation, the loads connected to these systems can also be arranged in either configuration. This...
232

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Updated: Jul 5, 2025

Quantifying the Relative Thickness of Conductive Ferromagnetic Materials Using Detector Coil-Based Pulsed Eddy Current Sensors
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使用TMR传感器对三相矩形总线条进行非接触电流测量.

Huafeng Su1, Haojun Li1, Weihao Liang1

  • 1Dongguan Power Supply Bureau of Guangdong Power Grid Co., Ltd., Dongguan 523120, China.

Sensors (Basel, Switzerland)
|January 23, 2024
PubMed
概括

本研究介绍了一种非接触式电流测量方法,使用道磁电阻 (TMR) 传感器用于三相总线条. 该系统以不到2.5%的RMS误差和1°的相位误差实现了高精度,使得可靠的功率监控成为可能.

关键词:
在TMR传感器上.配送柜柜的使用情况非接触电流测量方法在线校准在线校准长方形的总线杆.

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科学领域:

  • 电气工程 电气工程
  • 传感器技术 传感器技术
  • 电力系统 电力系统

背景情况:

  • 精确的电流测量对于电力系统的监控和控制至关重要.
  • 现有的非接触式方法经常面临动态范围,带宽或安装复杂性的限制.
  • 三相矩形总线条需要专门的非接触式传感解决方案.

研究的目的:

  • 开发和验证三相矩形总线杆的新型非接触电流测量方法.
  • 利用道磁电阻 (TMR) 传感器的优势,提高测量性能.
  • 为了实现当前传感器系统的准确和可靠的在线校准.

主要方法:

  • 一个使用三个TMR传感器的非接触电流传感器阵列被设计并放置在总线杆附近.
  • 一个由电阻控制的电阻负荷被用来产生可识别的校准电流.
  • 开发了一种强大的方法,从TMR传感器信号中提取电压元件进行校准.
  • 实现了一个完整的测量系统,集成TMR传感器,校准器和数据采集.

主要成果:

  • 与商业探测器相比,开发的系统显示了相对RMS误差小于2.5%和相位误差小于1°.
  • 基于TMR的电流传感器的非线性误差被发现比0.8%更好.
  • 拟议的在线校准方法在确定精确的电流与磁场关系方面被证明是有效的.

结论:

  • 建议使用TMR传感器的非接触电流测量方法对于三相矩形总线杆来说是准确和可靠的.
  • 该系统的性能,包括低误差率和有效的在线校准,使其适用于实际的发电应用.
  • 由于其有利的特性,TMR传感器为非接触式电流传感提供了可行的解决方案.