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相关概念视频

Line Protection with Impedance Relays01:27

Line Protection with Impedance Relays

69
Coordinating time-delay overcurrent relays in complex radial systems and directional overcurrent relays in multi-source transmission loops can be challenging. Impedance relays address these issues by responding to the voltage-to-current ratio, specifically measuring the apparent impedance of a line. These relays become more sensitive during faults as current increases and voltage decreases, thereby reducing the apparent impedance.
Under normal conditions, low load currents keep the measured...
69
Insulation Coordination01:23

Insulation Coordination

124
Insulation coordination is the process of matching electric equipment's insulation strength with protective device characteristics to protect the equipment against expected overvoltages. This selection is based on engineering judgment and cost. Equipment can generally withstand short-duration high transient overvoltages, but repeated tests with identical waveforms can yield inconsistent results. As a result, standard impulse voltage waveforms are used for testing, defined by specific times...
124
Distribution Reliability and Automation01:25

Distribution Reliability and Automation

107
Distribution reliability in electrical power systems is critical for ensuring an uninterrupted power supply to consumers at minimal cost. According to IEEE Standard Terms, reliability is the probability that a device will function without failure over a specified time period or amount of usage. For electric power distribution, this translates to maintaining continuous power supply and addressing customer concerns over power outages. Several indices, as defined by IEEE Standard 1366-2012, are...
107
Reclosers and Fuses01:26

Reclosers and Fuses

89
Automatic circuit reclosers enhance the protection of distribution circuits by interrupting and auto-reclosing an AC circuit according to a preset sequence. They effectively manage temporary faults on overhead distribution lines, often caused by tree limbs or wildlife, by briefly disrupting service to improve overall reliability. However, contact with reclosers or energized broken conductors on the ground can pose serious hazards.
A comprehensive protection scheme for radial distribution...
89
Fault Types01:18

Fault Types

80
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...
80

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Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope
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通过先进的绝缘体缺陷识别来提高电网可靠性.

Xiao Wang1, Ting Yang2, Yuntao Zou3

  • 1School of Television Arts, Communication University of Zhejiang, Hangzhou, China.

PloS one
|September 26, 2024
PubMed
概括
此摘要是机器生成的。

本研究介绍了IF-DETR,这是一个改进的变压器模型,用于检测电力线路上的绝缘体缺陷. 它提高了小缺陷检测的准确性,这对于可靠的输电系统至关重要.

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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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科学领域:

  • 电气工程 电气工程
  • 计算机视觉 计算机视觉
  • 人工智能的人工智能

背景情况:

  • 传统的绝缘体缺陷检测面临着小特征和背景混乱的挑战.
  • 准确的缺陷检测对于高压输电线路的可靠性和安全性至关重要.

研究的目的:

  • 为高压绝缘体开发一个先进的缺陷检测模型.
  • 为了提高检测微小和微妙缺陷的准确性和稳定性.

主要方法:

  • 开发了一个名为IF-DETR的增强检测变压器 (DETR) 模型.
  • 一个多规模的骨干网络被用于优越的小物体特征提取.
  • 整合了一个融合模块 (ECA-Net和SAU),以增强上下文信息.
  • 为了稳定匹配过程,引入了一个新的绝缘体缺陷 (IDIoU) 损失函数.

主要成果:

  • IF-DETR模型在检测小型绝缘体缺陷方面表现出显著的有效性.
  • 与现有的先进方法相比,该模型在平均精度 (AP) 中实现了2.3%的增加.
  • 实验结果证实了模型在准确性和特征提取方面的优越性.

结论:

  • IF-DETR模型代表了绝缘体缺陷检测技术的显著进步.
  • 这种方法通过改进检查来提高动力传输系统的安全性和可靠性.
  • 这种方法对高压基础设施的维护和检查具有广泛的影响.