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Fault Types01:18

Fault Types

75
When analyzing a single line-to-ground fault from phase A to ground at a three-phase bus, it is important to consider the fault impedance. This impedance is zero for a bolted fault, equal to the arc impedance for an arcing fault, and represents the total fault impedance for a transmission-line insulator flashover. To derive sequence and phase currents, fault conditions are translated from the phase domain to the sequence domain.
For line-to-line faults occurring between phases B and C, the...
75
Lossy Lines and Overvoltages01:22

Lossy Lines and Overvoltages

82
Transmission-line series resistance and shunt conductance cause three primary effects: attenuation, distortion, and power losses.
Attenuation
When constant series resistance and shunt conductance are present, voltage and current equations are modified. The propagation constant indicates that voltage and current waves consist of both forward and backward traveling components. These waves attenuate as they propagate, with the attenuation factor related to the resistance and conductance. In a...
82
Power System Three-Phase Short Circuits01:21

Power System Three-Phase Short Circuits

77
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...
77
Transmission-Line Differential Equations01:26

Transmission-Line Differential Equations

235
Transmission lines are essential components of electrical power systems. They are characterized by the distributed nature of resistance (R), inductance (L), and capacitance (C) per unit length. To analyze these lines, differential equations are employed to model the variations in voltage and current along the line.
Line Section Model
A circuit representing a line section of length Δx helps in understanding the transmission line parameters. The voltage V(x) and current i(x) are measured...
235
Traveling Waves: Lossless Lines01:27

Traveling Waves: Lossless Lines

121
The provided content explores the behavior of traveling waves on single-phase lossless transmission lines. It begins with a single-phase two-wire lossless transmission line of length Δx, characterized by a loop inductance LH/m and a line-to-line capacitance C F/m. These parameters result in a series inductance LΔx  and a shunt capacitance CΔx.
121
Boundary Conditions: Lossless Lines01:21

Boundary Conditions: Lossless Lines

83
Consider a single-phase, two-wire, lossless transmission line terminated by an impedance at the receiving end and a source with Thevenin voltage and impedance at the sending end. The line, with length, has a surge impedance and wave velocity determined by the line's inductance and capacitance.
At the receiving end, the boundary condition states that the voltage equals the product of the receiving-end impedance and current. This relationship is expressed as a function of the incident and...
83

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相关实验视频

Updated: Jun 6, 2025

In Situ Time-dependent Dielectric Breakdown in the Transmission Electron Microscope: A Possibility to Understand the Failure Mechanism in Microelectronic Devices
09:26

In Situ Time-dependent Dielectric Breakdown in the Transmission Electron Microscope: A Possibility to Understand the Failure Mechanism in Microelectronic Devices

Published on: June 26, 2015

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使用PZT输电线路电路模型检测结构损坏

Jozue Vieira Filho1, Nicolás E Cortez2, Mario De Oliveira3

  • 1School of Engineering, Sao Paulo State University (Unesp), São João da Boa Vista 13876-750, SP, Brazil.

Sensors (Basel, Switzerland)
|November 27, 2024
PubMed
概括
此摘要是机器生成的。

研究人员建议使用压电传感器交叉语音用于结构健康监测. 与传统方法相比,这种新的方法提高了损害检测的灵敏度.

关键词:
这就是SHM SHM.交叉效应的交叉效应是什么机电阻抗电机械阻抗压电式传感器 压电式传感器结构性监测 结构性监测 结构性监测

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Characterization of Full Set Material Constants and Their Temperature Dependence for Piezoelectric Materials Using Resonant Ultrasound Spectroscopy
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相关实验视频

Last Updated: Jun 6, 2025

In Situ Time-dependent Dielectric Breakdown in the Transmission Electron Microscope: A Possibility to Understand the Failure Mechanism in Microelectronic Devices
09:26

In Situ Time-dependent Dielectric Breakdown in the Transmission Electron Microscope: A Possibility to Understand the Failure Mechanism in Microelectronic Devices

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Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography
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Characterization of Full Set Material Constants and Their Temperature Dependence for Piezoelectric Materials Using Resonant Ultrasound Spectroscopy
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科学领域:

  • 材料科学 材料科学 材料科学
  • 机械工程 机械工程
  • 电气工程 电气工程

背景情况:

  • 像硫酸 (PZT) 这样的压电传感器对于结构健康监测 (SHM) 至关重要.
  • 靠近位置的PZT传感器之间的干扰或交叉声频在SHM中经常被忽视.
  • 然而,这种交叉通话,为敏感的结构故障检测提供了潜在的途径.

研究的目的:

  • 调查PZT传感器装置中用于结构损坏检测的交叉效应的使用.
  • 为了建模PZT传感器交叉声作为一个多导体传输线现象.
  • 提高现有的SHM技术的灵敏度.

主要方法:

  • 开发了一个阻抗矩阵模型,用于附带PZTs的宿主结构.
  • 在OnScale®软件中使用有限元素建模 (FEM) 来模拟健康和受损的梁结构.
  • 进行拟议方法的实验验证.

主要成果:

  • 提出的基于交叉通道的方法在检测结构损坏时表现出更好的灵敏度.
  • 模拟和实验结果验证了阻抗矩阵方法的有效性.
  • 这种新方法比传统的电机阻抗 (EMI) 技术有显著的改进.

结论:

  • 在PZT传感器组合中的交叉声可以有效地用于敏感的结构损坏检测.
  • 模拟交叉通话作为一个多导体传输线提供了一个强大的框架,为SHM.
  • 这种方法显著提高了基于EMI的传统SHM方法的灵敏度.