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相关概念视频

Overcurrent Relays01:26

Overcurrent Relays

168
Overcurrent relays, crucial for circuit protection, are connected to the secondary current of a current transformer. There are two primary types of overcurrent relays: instantaneous and time-delay.
Instantaneous overcurrent relays activate immediately when the input current exceeds a predetermined value, known as the pickup current, instantly energizing the circuit breaker trip coil. This rapid response is vital for addressing severe faults quickly.
Time-delay overcurrent relays, on the other...
168
Line Protection with Impedance Relays01:27

Line Protection with Impedance Relays

138
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...
138
Reclosers and Fuses01:26

Reclosers and Fuses

169
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...
169
Circuit Breaker and Fuse Selection01:23

Circuit Breaker and Fuse Selection

150
A circuit breaker is a device engineered to interrupt fault currents and sometimes reclose automatically. When a fault current is detected, the breaker separates the electrical contacts, which generates an arc. This arc is extinguished by methods such as elongation, cooling, or splitting, depending on the breaker's design. Breakers are categorized based on the voltage they operate at and the medium used for arc extinction, such as air, oil, SF6 gas, or vacuum.
In high-voltage systems,...
150
Power System Three-Phase Short Circuits01:21

Power System Three-Phase Short Circuits

150
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...
150
Radial System Protection01:23

Radial System Protection

153
Radial systems employ time-delay overcurrent relays to reduce load interruptions. When a fault occurs, the nearest breaker opens first, while upstream breakers remain closed due to longer delay settings. This approach ensures minimal disruption to the rest of the system.
In a radial system with a fault downstream of the third breaker, ideally, only the third breaker will open, isolating the fault and interrupting the load connected beyond it. The second breaker has a longer delay setting,...
153

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相关实验视频

Updated: Sep 18, 2025

Design and Application of a Fault Detection Method Based on Adaptive Filters and Rotational Speed Estimation for an Electro-Hydrostatic Actuator
06:45

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适应性超电流保护,考虑到故障电流限制器的影响.

R A Mahmoud1, K G Ghaly2, S A Hasan2

  • 1Electrical Power and Machines Engineering (PME) Department, College of Engineering Science & Technology, Misr University for Science and Technology (MUST), 6th of October City, Giza, Egypt. mohandes_ragab@yahoo.com.

Scientific reports
|June 20, 2025
PubMed
概括

本研究引入了一个自适应超电流继电器 (OCR) 算法,可以计算故障电流限制器 (FCL) 和分布式发电机 (DGs),而不会引入延迟. 该算法确保可靠的故障检测和精确的运行时间,以加强电力系统的保护.

关键词:
适应式超电流继电器 (AOCRs) 是一种适应式超电流继电器.常规超电流继电器 (COCR) 的使用故障电流限制器 (FCLs) 是一种运行时间 (OPT)电力网络,分布式发电机 (DG)

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Author Spotlight: Simulation and Analysis of the Temperature Rise of Ring Main Unit Equipment
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Author Spotlight: Simulation and Analysis of the Temperature Rise of Ring Main Unit Equipment

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相关实验视频

Last Updated: Sep 18, 2025

Design and Application of a Fault Detection Method Based on Adaptive Filters and Rotational Speed Estimation for an Electro-Hydrostatic Actuator
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科学领域:

  • 电气工程 电气工程
  • 电力系统保护保护 电力系统保护
  • 控制系统 控制系统

背景情况:

  • 增加电力系统容量和分布式发电机 (DG) 的集成导致故障时更高的短路电流.
  • 故障电流限制器 (FCL) 减轻这些电流,但可能会阻碍诸如超电流继电器 (OCR) 等保护装置的性能.
  • FCL对OCR响应时间的影响需要适应性保护策略来防止设备损坏.

研究的目的:

  • 开发一个自适应的OCR算法,准确地确定FCL和DG的电力系统中的运行时间.
  • 消除FCL在OCR操作中引入的延迟.
  • 为了提高电力系统保护的可靠性和速度.

主要方法:

  • 提出了一种由两个模块组成的自适应性OCR算法,使用Z-score方法检测故障,并使用平均比率曲线估计运行时间.
  • 该算法在MATLAB中实现,并通过使用替代过渡程序 (ATP) 在现实世界电力系统模型上的模拟验证.
  • 广泛的模拟涵盖了各种负载条件,故障类型,启动角度,电阻和故障区域,无论有没有FCL/DG.

主要成果:

  • 拟议的自适应OCR算法展示了在线操作,自动调整设置以准确检测故障,同时在正常情况下保持不活跃.
  • 通过调整移动数据窗口大小,可以有效控制算法的速度和灵敏度.
  • 阶段电流的Z-score对于识别故障阶段和分类故障类型非常有用.

结论:

  • 开发的自适应性OCR算法提供了一个可靠,准确和易于使用的解决方案,用于在FCL和DG存在时保护电力系统.
  • 算法的无延迟调整运行时间的能力通过减少电气和机械应力来提高系统设备的寿命.
  • 与数字保护系统的集成是可行的,可以在传统和智能电网中应用.