Results 71 to 80 of about 188 (115)
Guideline for Numerical Electromagnetic Analysis Method [PDF]
, 2013 The aim of this document is to provide an extended description and application guide of methods belonging to the so-called Numerical Electromagnetic Analysis (NEA) applied to the calculation of electromagnetic transients in power systems.
Ametani, Akihiro +19 more
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DC Circuit Breaker Evolution, Design, and Analysis [PDF]
While traditional AC mechanical circuit breakers can protect AC circuits, many other DC power distribution technologies, such as DC microgrids (MGs), yield superior disruption performance, e.g., faster and more reliable switching speeds.
Gunawardane, K, Lie, TT, Moradian, M
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Gaoya dianqi, 2019 特快速暂态过电压（very fast transient overvoltage,VFTO）严重威胁到气体绝缘开关设备（gas insulated substation,GIS）和邻近设备的安全运行,在总结前人研究的基础上,文中提出应用小磁环加装大磁环抑制GIS中的VFTO。依托VFTO发生器和真实500 kV GIS组成的试验平台,分别在充电电压为460、500、540、560 kV情况下开展无磁环、40、80 cm小磁环串和80 cm小磁环串加装10 cm大磁环串的一系列对比试验 ...
高凡夫 +5 more
doaj
General Formulation and Accurate Evaluation of Earth-Return Parameters for Overhead/Underground Cables [PDF]
, 2018 RÉSUMÉ La simulation de transitoire électromagnétique (EMT) dans les réseaux électriques est devenue un outil important pour la recherche et les applications pratiques.
Xue, Haoyan
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Gaoya dianqi, 2016 精确的隔离开关电弧模型对变电站特快速暂态过电压（very fast transient overvoltage,VFTO）的仿真有着关键性的作用。文中对开关电弧的电阻模型进行了优化,建立了电弧的分段模型。同时,笔者从间隙击穿,高频电弧熄弧对电弧重击穿的影响等方面进行了讨论,并以此为判据,建立了可以反映VFTO多次重燃过程的计算流程。根据实际测试线路,在ATP仿真软件中搭建了仿真电路并进行了暂态仿真。仿真结果表明,相对于单次燃弧的传统电弧模型,基于分段电阻的多次重燃弧模型可以更好地模拟实际开关特性 ...
张建功 +5 more
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Gaoya dianqi, 2010 在隔离开关切合容性小电流试验中,回路中可能会由于隔离开关的多次重燃而产生特快速暂态过电压（very fast transient overvoltage,VFTO）,这对试验回路中的设备和元件,尤其是试验变压器绕组绝缘构成了很大的威胁。笔者利用ATP-EMTP电磁暂态仿真软件计算了隔离开关进行分闸操作时在试验变压器端部出现的VFTO,分析了影响重燃过电压大小的因素,并研究了利用在试验变压器输出端加装保护间隙时的保护效果。仿真结果表明,分闸时重燃过电压与发生重燃的时间有关,与燃弧时间无关 ...
孟峥峥, 齐效华, 吕亮, 李彦明
doaj
Demonstrating the service performance of gas-insulated HVDC equipment [PDF]
In the recent years, new designs of gas-insulated HVDC equipment up to ±550 kV DC have been developed for future grid extensions. Common engineering practice is to demonstrate their service operation within a pilot installation.
Hallas, Martin Urban
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Estudio de la situación actual y alternativa de solución al problema ocurrido en las barras de la subestación blindada Paute-Molino de 230 KV. [PDF]
, 1998 Se realiza una descripción del equipo de maniobra encapsulado en SF6 de la Subestación Paute-Molino, patio de 230 KV., así como un breve análisis de la coordinación de aislamiento contra descargas atmosféricas.
Chicaiza Soto, Marlon Leonardo
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Power System Protection Design for NPP [PDF]
, 2012 Chen, Shi-Lin, Lee, Chang-Hsing
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Investigation of transient and safety issues in gas insulated systems [PDF]
This thesis investigates the occurrence, characteristics and effects of Very Fast Transients (VFTs) associated with disconnector switching operations in Gas Insulated Substations.
James, Jonathan Colin
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