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相关概念视频

Power System Three-Phase Short Circuits01:21

Power System Three-Phase Short Circuits

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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...
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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...
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Insulation Coordination01:23

Insulation Coordination

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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...
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Bus Impedance Matrix01:24

Bus Impedance Matrix

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Calculating subtransient fault currents for three-phase faults in an N-bus power system involves using the positive-sequence network. When a three-phase short circuit occurs at a specific bus, the analysis uses the superposition method to evaluate two separate circuits.
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Design Consideration01:22

Design Consideration

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Designing a structure involves a series of considerations, primarily the material's ultimate strength, calculated through tests that measure changes under increased force until the material reaches its breaking point or limit. The ultimate load, where the material breaks, is divided by its original cross-sectional area, resulting in the ultimate normal stress or strength. The ultimate shearing stress is another significant factor taken into account.
The factor of safety is another key...
177
Design Example: Analyzing Capacity Contours for Flood Risk Assessment01:17

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Flood risk assessment involves careful planning and analysis to ensure the safety of communities near water retention structures. Capacity contours are a vital tool in this process, as they illustrate the potential spread of water at specific levels in a given area. In the context of building a bund across a small valley, these contours play a critical role in evaluating the safety of nearby residential areas.In this example, the bund is intended to store stormwater in the valley. The engineers...
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A Modeling and Simulation Method for Preliminary Design of an Electro-Variable Displacement Pump
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500千伏变电站工程项目的后评估模型使用模糊的综合评估方法.

Jianquan Chen1, Yi Zhuang1, Shaoyong Chen1

  • 1Guangdong Power Grid Co., Ltd Yunfu Power Supply Bureau, Yunfu City, 527300, China.

Heliyon
|March 3, 2025
PubMed
概括
此摘要是机器生成的。

一个模糊的综合评估模型评估了一个500千伏的电力项目,在规划和施工方面获得了高分,但经济效益较低. 建议侧重于改善成本控制和对未来项目的资金利用.

关键词:
500 kV的变电站工程工程.分析层次结构过程过程分析层次结构.模糊的综合评估方法.评估后的模型项目管理 项目管理

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科学领域:

  • * 动力系统工程 * 动力系统工程
  • * * 项目管理项目管理.
  • * 经济评估 * 经济评估

背景情况:

  • *对于500千伏输电和变电站项目,全面的经济评估至关重要.
  • *现有的评估方法可能无法完全捕捉这些大型基础设施投资的复杂性.

研究的目的:

  • *为500千伏输电和变电站项目开发和应用后评估模型.
  • * 评估一个特定的500kV项目的经济效益和整体结果.
  • *提供基于数据的建议,以改善未来的项目管理和可持续性.

主要方法:

  • * 模糊综合评估 (FCE) 方法与分析层次过程 (AHP) 和德尔菲方法集成.
  • *为定性和定量指标制定量身定制的评分标准.
  • * 专家意见和经验数据的汇总,以进行整体评估.

主要成果:

  • * 总体项目成功得分为92.54分100分.
  • * 在规划效率 (100.00),初步成果 (99.12) 和建设绩效 (98.00) 中表现突出.
  • * 对于社会和环境影响,得分完美 (100.00),但对于经济效益 (61.88) 和财务绩效 (54.33) 的得分较低.

结论:

  • * 开发的FCE模型为评估复杂的电力项目提供了一个强大的框架.
  • *虽然该项目在非财务方面表现出色,但在经济和财务表现方面需要显著改进.
  • * 该研究提供了有价值的见解和实际指导,以提高未来输电和变电站项目的管理和经济可行性.