Results 71 to 80 of about 940 (189)
Gaoya dianqi, 2023 在气体绝缘开关设备（gas insulated switchgear,GIS）中，隔离开关在操作过程中会产生快速暂态过电压（very fast transient overvoltage,VFTO），精确的隔离开关电弧模型对快速暂态过电压的仿真起着关键的作用。文中在分段电弧的基础之上，利用ATP-EMTP软件搭建了隔离开关多次重燃弧模型；为了研究负载端残余电荷对VFTO的影响，文中选取多组不同幅值的残余电压。仿真结果表明：基于分段电弧的多次重燃弧模型产生的VFTO谐波幅值比传统的时变电阻电弧模型要大 ...
张普, 莫付江, 刘欣桐, 王凡
doaj
Dianci bileiqi, 2017 近些年来,SF6气体绝缘变电站（GIS）以优异的电气性能在国内外得到了广泛应用,但是运行中隔离开关（DS）的分合闸操作会引起快速暂态过电压（VFTO）,对电力设备绝缘造成严重威胁,已经引起了许多电力系统专家与学者的高度重视。国内外学者针对GIS中VFTO防护的问题,从VFTO的产生和传播过程两个方面进行了大量研究,提出了利用快速动作隔离开关、慢速动作隔离开关、分合闸电阻、铁氧体磁环、金属氧化物避雷器等来抑制VFTO的方法。分析了目前所研究的几种主要防护VFTO方法的研究现状 ...
南保峰 +6 more
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Self-Calibration Sensor for Contactless Voltage Measurement Based on Dynamic Capacitance. [PDF]
Sensors (Basel), 2023 Suo C +5 more
europepmc +1 more source
Transmission Line Voltage Measurement Utilizing a Calibrated Suspension Grounding Voltage Sensor. [PDF]
Sensors (Basel), 2023 Huang R +5 more
europepmc +1 more source
A New Cost Effective Approach to Suppress Very Fast Transients on Power Transformers Connected to Gas Insulated Substations [PDF]
, 2016 This thesis investigates the feasibility of a new method to prevent internal resonance in transformers connected to gas insulated substation due to very fast transient overvoltage in the GIS.
Babaeilaktarashani, Mehdi
core
Pretemporal Transcavernous Approach for Resection of Non-meningeal Tumors of the Cavernous Sinus: Single Center Experience. [PDF]
Front Surg, 2022 Huang M +5 more
europepmc +1 more source
Cavity reactor critical experiment Progress report, period ending 31 Jul. 1968 [PDF]
Configuration and flux density maps for cavity reactor critical ...
core +1 more source
Gaoya dianqi, 2013 对隔离开关操作引起的VFTO进行仿真是实现合理的绝缘配合及建设坚强特高压电网的重要课题。针对1 000 kV南阳开关站的HGIS布置,对隔离开关操作引起的VFTO进行了计算分析,计算结果表明,隔离开关中电阻对VFTO具有显著的抑制作用。南阳开关站隔离开关带有500Ω抑制电阻,在最苛刻条件下关合GIS中的VFTO幅值最大为1 266.6 kV,远低于其额定雷电冲击耐受水平2 400 kV;关合一次抑制电阻吸收的能量远低于其额定热容量,因此南阳开关站的隔离开关可以可靠操作。
魏长宇 +6 more
doaj
Multifrequency nonlinear model of magnetic material with artificial intelligence optimization. [PDF]
Sci Rep, 2022 Pawłowski J +2 more
europepmc +1 more source
A comparison of transformer HF models and their application to PQ analysis [PDF]
, 2011 This research work is devoted to the comparison of some proposed high-frequency (HF) models of transformers and their application to power quality (PQ) studies.
Arroyo Gutiérrez, Alberto +4 more
core +1 more source