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相关概念视频

Line Protection with Impedance Relays01:27

Line Protection with Impedance Relays

109
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...
109
Pilot and Numeric Relaying01:21

Pilot and Numeric Relaying

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Pilot relaying is a type of differential protection used in power systems. It compares electrical quantities at the terminals of equipment via a communication channel instead of direct relay interconnection. This method is essential for transmission lines where the terminals are far apart, typically up to 80 km for lines with 69 to 115 kV ratings. Four types of communication channels are used for pilot relaying:
109
Differential Relays01:20

Differential Relays

189
Differential relays are used to protect generators, buses, and transformers by comparing electrical quantities at different points. When a fault occurs, the difference in current between the two points triggers the relay to operate, opening the circuit breaker. Under normal conditions, the current entering (i1) and leaving (i2) a generator are equal. When a fault occurs, however, these currents become unequal, and the difference current flows in the relay operating coil, causing the relay to...
189
Directional Relays01:25

Directional Relays

150
Directional relays, essential for managing unidirectional fault currents, enhance the safety and efficiency of power systems. On power lines equipped with directional relays, faults downstream (to the right) of the current transformer typically cause the fault current to lag the bus voltage by approximately 90 degrees, known as the forward direction. In contrast, upstream (left-side) faults may result in the fault current leading the bus voltage by nearly 90 degrees, termed the reverse...
150
International System of Units01:29

International System of Units

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The International System of Units, known as the SI system, is a universally accepted measurement system recognized and used worldwide. The SI system is based on a set of three base units considered absolute, and their values do not change with location. These base units are meters, kilograms, and seconds.
Prefixes are used to define both larger and smaller quantities in the SI system. For example, milli, micro, and nano define smaller quantities, while kilo, mega, and giga are used to define...
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Overcurrent Relays01:26

Overcurrent Relays

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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...
126

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Electrophoretic Mobility Shift Assay EMSA for the Study of RNA-Protein Interactions: The IRE/IRP Example
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国际中继 国际中继

Sidhant Singh1, Abedalaziz O Surkhi2, Callum Howard3

  • 1Barts and The London School of Medicine and Dentistry, Queen Mary University of London, UK.

Asian cardiovascular & thoracic annals
|June 5, 2023
PubMed
概括

用于内血管大动脉门修复 (EAR) 的三分支RELAYTM内移植显示出优异的结果,在24个月内零死亡率,中风或重新干预. 这与双分支配置形成鲜明对比,突出显示了三分支装置在大动脉修复中的潜力.

关键词:
大动脉的门.一个主动脉动脉.一个大动脉动脉瘤.大动脉切割剖析.疾病 疾病 疾病 疾病血管内置手术 血管内置手术干预干预干预干预干预干预位置 位置 位置 位置

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科学领域:

  • 血管外科 血管外科
  • 医疗器械 医疗器械
  • 干预心脏病学 干预心脏病学

背景情况:

  • 内血管大动脉门修复 (EAR) 是对大动脉门病理的开放手术的一个新兴替代方案.
  • 对EAR设备的兴趣正在增长,重点是它们的临床疗效.
  • 这项研究比较了对EAR的双和三分支RELAYTM内移植的临床结果.

研究的目的:

  • 为了比较使用双和三分支RELAYTM内移植的内血管大动脉门修复 (EAR) 的临床结果.
  • 评估这些设备在多中心环境中的安全性和有效性.
  • 提供EAR后患者结局的比较数据.

主要方法:

  • 未来收集使用RELAYTM内移植的EAR程序的多中心数据 (2019年1月 - 2022年1月).
  • 在手术后的30天,6,12个月和24个月进行后续检查.
  • 追溯分析包括后勤回归和卡普兰-梅尔生存分析.

主要成果:

  • 131名患者接受治疗,103名接受了双分支和28名接受了三分支RELAYTM内移植.
  • 三分支组:在24个月内零死亡率,中风或重新干预;100%的目标血管通透性.
  • 双分支组:4例死亡,19例中风,30天内50次重新干预,74%的目标血管穿透率.

结论:

  • 三分支RELAYTM内移植显示出良好的临床结果和疗效.
  • 三分支组的结果与现有文献一致.
  • 对内血管大动脉门修复装置的进一步比较研究是有必要的.