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相关概念视频

Circuit Breaker and Fuse Selection01:23

Circuit Breaker and Fuse Selection

100
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,...
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Reclosers and Fuses01:26

Reclosers and Fuses

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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...
100
Series R—L Circuit Transients01:22

Series R—L Circuit Transients

96
In a series resistor-inductor (R-L) circuit, closing the switch at the start of the time period simulates a three-phase short circuit, a fault condition where all three phases of an unloaded synchronous machine are short-circuited. When there is no fault impedance and no initial current, the initial voltage is determined by the phase angle of the source voltage.
Using Kirchhoff's Voltage Law (KVL) to analyze this circuit helps determine the total asymmetrical fault current, which consists...
96
Bridge rectifier01:24

Bridge rectifier

573
The bridge rectifier is essential in electronics for efficiently converting alternating current (AC) to direct current (DC). Comprised of four diodes configured in a bridge layout, this rectifier effectively processes both the positive and negative halves of the AC waveform, making it superior to half-wave and full-wave center-tapped rectifiers in terms of voltage regulation and output stability.
Operationally, the bridge rectifier allows current flow through two of its diodes during each...
573
Three-Phase Short Circuit—Unloaded Synchronous Machine01:21

Three-Phase Short Circuit—Unloaded Synchronous Machine

134
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...
134
Clamper Circuit01:14

Clamper Circuit

399
A clamper circuit, also known as a DC restorer, represents a specialized variant of the rectifier circuit, notable for its method of taking the output across the diode rather than the capacitor. This configuration lends to several distinctive applications, particularly in handling square wave inputs.
Within this circuit, the diode's orientation prompts the capacitor to charge up to the level of the most negative peak of the input signal. Upon reaching this state, the diode ceases to...
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基于共振电流注入的改进组装直流断路器.

Puyi Cui1,2, Guoli Li1,3, Qian Zhang1,4

  • 1School of Electrical Engineering and Automation, Anhui University, Hefei, China.

PloS one
|July 17, 2024
PubMed
概括

一种基于电流注入 (CI-MPACB) 的多端口组装断路器有效清除直流断路线. 这种创新的设计使用共振电流注入快速灭弧,提高直流网络的安全性和降低成本.

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科学领域:

  • 电气工程 电气工程
  • 电力系统 电力系统
  • 电路保护 电路保护

背景情况:

  • 高容量,低成本的直流断路器 (DCCB) 对于直流网络故障清除至关重要.
  • 组装直流断路器 (ADCCB) 可以降低成本,但在故障时面临长时间高压的挑战.
  • 现有的设计需要改进,以应对电压压力并确保可靠的故障中断.

研究的目的:

  • 提出基于电流注入 (CI-MPACB) 的多端口组件断路器,以实现高效的直流故障中断.
  • 为了克服传统ADCCB在电压压力和故障清理时间方面的局限性.
  • 通过创新的电流注入设计,降低直流断路器的成本.

主要方法:

  • 开发了一种基于电流注入 (CI-MPACB) 的多端口组装断路器.
  • 带有振幅增加的共振电流是通过控制集成网关交换式thyristors (IGCTs) 来产生的.
  • 复杂的频域电路分析在主断断段 (MBS) 上进行设计和验证.

主要成果:

  • 在CI-MPACB成功地产生了共振电流,用于在分断段 (SBS) 中的弧度灭绝.
  • 频域分析和参数设计确保快速可靠的故障电流切断.
  • PSCAD/EMTDC模拟和测试结果证实了CI-MPACB的开放可行性和有效性.

结论:

  • 拟议的CI-MPACB有效清除直流断层线,提高安全性和可靠性.
  • 响应电流注入方法显著减少弧度持续时间和电压应力.
  • 这种设计为高容量的直流断路器提供了具有成本效益的解决方案.