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Calibration of impulse high-voltage test systems above 500 kV peak: implementation and evaluation [PDF]
Scientific ReportsThe rapid technological advancements of today have ushered in a new era of impulse high-voltage testing equipment capable of reaching high voltage ranges. Traditional calibration methods fall short in calibrating such high voltage equipment.
Ahmed S. Haiba
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Ventilatory constraint is more severe in walking than cycling in patients with COPD
Current Research in Physiology, 2021 Due to its effectivity in assessing functional capacity and adding prognostic information to the staging of chronic obstructive pulmonary disease (COPD) patients, the 6-min walk test (6MWT) is extensively used in clinical evaluation.
Jan Chlumský, Ondřej Zindr
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Analysis on Cost Structure and Investment Level of ±800 kV Converter Stations
南方能源建设, 2020 [Introduction] The paper aims to study on the investment features of ±800 kV Converter Stations and provide guidance for the future constructions of ±800 kV Converter Stations in the field of project cost. [Method] By collecting data of design quantities,
SHEN An, DONG Jianmin, LI Luyang
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Simulation Experiment on Discharge of Plastic Film Overlapping on UHVDC Transmission Lines
Zhongguo dianli, 2022 In order to study the discharge phenomena of plastic film overlapping on UHV DC transmission lines and explore the cause of flashover fault of a ± 800 kV UHV line, an experimental study is conducted on the flashover characteristics of plastic film with ...
Shenghui WANG +3 more
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Gaoya dianqi, 2021 800 kV高压交流隔离开关是我国西北电网750 kV输电线路重要的开关设备。文中在国内外高压开关设备研究的基础上,进一步对800 kV高压交流隔离开关进行理论分析研究,确定了800 kV高压交流隔离开关的技术方案及结构参数,建立了800 kV高压交流隔离开关三维模型并进行机械及绝缘特性仿真分析。研制出800 kV高压交流隔离开关样机并通过了型式试验的验证。通过仿真分析和型式试验研究得出,文中设计的800 kV高压交流隔离开关结构合理,机械特性和绝缘特性满足招标要求 ...
李宏楼 +11 more
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Gaoya dianqi, 2020 为了提高±800 kV特高压直流输电线路抵御雷害风险能力,研究了±800 kV直流线路避雷器安装选点、基本参数、安装方案和工程应用。文中以±800 kV锦苏线浙江段为工程背景,对其线路走廊落雷情况进行了分析及差异化防雷评估,提出了安装选点原则,开展了避雷器的关键技术参数的理论计算及试验研究,分析了线路避雷器的安装要求,根据安装选点原则配置了避雷器,设计了一种复合绝缘子斜拉式安装方法,成功实施了±800 kV直流线路避雷器的大规模工程应用,对±800 kV直流线路避雷器在其余±800 ...
曹伟 +5 more
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Gaoya dianqi, 2017 ±800 kV特高压直流输电线路是中国大电网的重要组成部分,其运行安全与否直接影响中国电网的稳定。特高压直流输电线路输电距离长,沿线地形地貌复杂、雷电活动频繁,雷击闪络已成为影响线路安全运行的一个关键风险点。目前,±500 kV直流线路避雷器已实现开发应用,并且防雷效果显著,但±800 kV直流线路避雷器的研制及应用仍然是空白。为了提高特高压直流输电线路抵御雷击风险能力,研制出了国内首台特高压±800 kV直流输电线路用避雷器。文中设计了±800 kV直流线路避雷器结构,提出了相关技术参数 ...
万帅 +6 more
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南方能源建设, 2019 [Introduction] The real-time monitoring and regular inspection for the primary electrical equipment in valve hall is extremely important to safety operation of converter station. [Method] In this study we investigated the demand of regular inspection of ±
ZHANG Xueyan +4 more
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Study of the Prevention Method of ±800 kV Transmission Tower Foundation Deviation
Energies, 2023 The stability of transmission tower bases is key to ensuring the safe operation of power lines. This paper proposes a joint displacement-control technique for foundation-inclined piles and prestressed foundation tie beams to address the problem of tower ...
Xinsheng Dong +5 more
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±800 kV/6250 A换流阀MVU试验中模拟负载匹配性研究
Gaoya dianqi, 2017 为确保研制的±800 kV/6250 A换流阀绝缘试验的顺利进行,笔者对基于±800 kV/5000 A和±1100 kV/5 000 A大组件换流阀研制的模拟负载在±800 kV/6250 A小组件换流阀MVU绝缘试验中的可用性进行了研究;根据IEC 60700-1—2015标准,对换流阀在直流耐压试验、操作冲击电压试验和雷电冲击电压试验3项试验中呈现出的不同特性,从数值计算和建模仿真2个方面进行了研究,通过±800 kV/5000 A小组件换流阀MVU试验数据对所用方法和仿真模型进行验证 ...
马元社 +6 more
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