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Study of contact resistance in the design of a pyro-breaker applied in superconducting fusion facility

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Plasma Science and Technology 2019年第6期21卷 153-159页

作者： Jun HE zhiquan song Cunwen TANG Peng FU Jie ZHANG Institute of Plasma Physics Chinese Academy of Sciences Hefei 230031 People's Republic of China University of Science and Technology of China Hefei 230031 People's Republic of China

Pyro-breaker is a fast-responding and high-reliable explosive-driven circuit breaker,which has been applied in several quench protection systems,such as International Thermonuclear Experimental Reactor and Experimental Advanced Superconducting *** an indispensable back-up switch,Pyro-breaker guarantees the reliability and safety of the system and avoids tremendous loss when quench *** contact,a crucial part of an electrical device greatly determines the steady current capacity of a ***,due to the complexity of the model and the deficiency knowledge of the microstate of contact areas,an accurate calculation for contact resistance is difficult to acquire.A study of electrical contact in the design of a Pyro-breaker has been presented in this *** engineering calculation method is verified with *** are fitted for the presented model,which will be a significant theoretical basis for the future designing.

关键词： quench protection system pyro-breaker contact resistance four-point-method

Genome-wide identification of DNA-PKcs-associated RNAs by RIP-Seq

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Signal Transduction and Targeted Therapy 2019年第1期4卷 493-495页

作者： zhiquan song Ying Xie Zongpei Guo Yang Han Hua Guan Xiaodan Liu Teng Ma Ping-kun Zhou Department of Radiation Toxicology and Oncology Beijing Key Laboratory for RadiobiologyBeijing Institute of Radiation Medicine100850 BeijingPeople’s Republic of China Department of Preventive Medicine Medical School of Hunan Normal University410078 ChangshaPeople’s Republic of China Institute for Environmental Medicine and Radiation Hygiene School of Public HealthUniversity of South China421001 HengyangHunan ProvincePeople’s Republic of China Department of Cellular and Molecular Biology Beijing Chest HospitalCapital Medical University/Beijing Tuberculosis and Thoracic Tumor Research Institute101149 BeijingChina

Dear Editor,The DNA-dependent protein kinase catalytic subunit(DNA-PKcs)forms a serine/threonine protein kinase complex with the Ku heterodimer(Ku70/Ku80)and plays an important role in the DNA damage response(DDR)and maintenance of genomic stability through nonhomologous end joining(NHEJ),wherein the Ku heterodimer recognizes and binds broken DNA ends,facilitating the recruitment and activation of DNA-PKcs.1 Activated DNA-PKcs phosphorylates and alters the function of factors that mediate NHEJ,including DNA-PKcs itself.2 In addition,DDR-independent roles of DNA-PKcs have been demonstrated.3 Studies further identified DNA-PKcs as a modulator of cancer-associated pathways distinct from DNA repair,including hypoxia,metabolism,the inflammatory response,and transcriptional regulation.

关键词： Genome metabolism damage

100 kA/10kV thyristor stack design for the quench protection system in CRAFT

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Plasma Science and Technology 2023年第5期25卷 193-206页

作者：仝玮徐猛李华陈波宋执权 School of Electrical Engineering and Automation Hefei University of TechnologyHefei 230009People’s Republic of China Institute of Plasma Physics Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031People’s Republic of China University of Science and Technology of China Hefei 230026People’s Republic of China

Thyristors have longer lifetimes,higher reliability,and very high voltage and current ratings and they require less maintenance than other high-power semiconductor *** a result,they are particularly suitable for quench protection systems(QPSs),which protect the superconducting magnets in large fusion devices from *** this paper,we propose a design for a 100 k A/10 k V thyristor stack supported by both theoretical and simulation-based analyses as well as experimental *** to the ultrahigh electrical performance requirements imposed on the QPS by the Comprehensive Research Facility for Fusion Technology(CRAFT),three main issues must be considered:the voltage-balancing problem caused by multiple thyristors in a series structure,the increased junction temperature problem caused by extremely high currents,and the reverse recovery phenomenon that arises from the thyristor’s physical ***,a series of detailed theoretical analyses,simulations,and experiments,including a thyristor junction temperature prediction method and reverse recovery process modeling,were carried out to optimize the ***,the reliability and stability of the thyristor stack were verified by a series of prototype *** results confirmed the correctness and accuracy of the proposed thyristor stack design method and also indicated that the proposed thyristor stack can meet the application conditions of a 100 k A QPS in the CRAFT project.

关键词： superconducting magnet thyristor pulsed power supply quench protection system

Initial Rotor Position Detection of 12/10 Flux-switching Permanent Magnet Motors

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中国电机工程学报 2013年第9期33卷 I0014-I0014页

作者： XU Peilin DENG zhiquan WANG Yu song Lucheng Nanjing University of Aeronautics and Astronautics

电机转子初始位置检测的精度直接决定其启动运行时的性能。针对12/10极永磁磁通切换型电机,在验证其凸极性的基础上,采用注入脉振高频信号实现转子初始位置估计。通过对传统高频脉振正弦电压信号注入的分析,研究了基于高频方波或三角波... 详细信息

电机转子初始位置检测的精度直接决定其启动运行时的性能。针对12/10极永磁磁通切换型电机,在验证其凸极性的基础上,采用注入脉振高频信号实现转子初始位置估计。通过对传统高频脉振正弦电压信号注入的分析,研究了基于高频方波或三角波的注入方法,再利用电流差值调制或直接信号调制方法得到位置误差信号,同时根据磁路的饱和效应,通过对d轴电流过零点时间差值的累加,实现了磁极方向辨识。分析了位置误差信号的系数与初始位置检测收敛性的关系。通过实验验证了所提方法的正确性和可行性。

关键词：转子磁通初始位置检测电机转子切换开关磁阻电动机永磁转子位置检测永久磁铁

Preliminary design of high power magnet converter for CRAFT

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Plasma Science and Technology 2020年第4期22卷 113-120页

作者： Zhongma WANG Peng FU Liansheng HUANG zhiquan song Xiuqing ZHANG Tianbai DENG Tao CHEN Ronglin HUANG Zhenshang WANG Xiaojiao CHEN Shiying HE Zejing WANG Guanghong WANG Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People's Republic of China University of Science and Technology of China Hefei 230026People's Republic of China

In order to test the superconducting magnet performance for the Comprehensive Research Facility for Fusion Technology(CRAFT)project of China,a power supply converter needs to be *** this paper,short circuits upstream and downstream of the direct current(DC)reactor are analyzed,and the thyristor style and the parallel number are determined by the limit analysis of junction temperature and fault current I^*** this basis,the over current and voltage verification of fast fuse are finished to protect the thyristor at fault cases by considering the short circuit of the bridge ***,the resistor and capacitor parameters of thyristor snubber are committed to decreasing the reverse over *** analysis results will be used as the preliminary design of high power magnet converter for CRAFT.

关键词： CRAFT converter thyristor fast fuse snubber

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失超保护系统直流真空断路器开断换流分析

高电压技术 2023年第9期49卷 3827-3834页

作者：徐猛仝玮李华宋执权许强林傅鹏中国科学院合肥物质科学研究院等离子体物理研究所合肥230031 中国科学技术大学合肥230026 合肥工业大学电气与自动化工程学院合肥230009

磁约束聚变装置的失超保护系统利用直流断路器快速切断超导磁体回路的电流,实现磁体能量的转移与释放,以保障磁体安全。随着超导磁体运行电流等级的不断提升,直流断路器的设计面临着巨大挑战。本文针对10 kV/100 kA的大容量失超保护系... 详细信息

磁约束聚变装置的失超保护系统利用直流断路器快速切断超导磁体回路的电流,实现磁体能量的转移与释放,以保障磁体安全。随着超导磁体运行电流等级的不断提升,直流断路器的设计面临着巨大挑战。本文针对10 kV/100 kA的大容量失超保护系统设计,提出使用直流真空断路器作为开断电流的主保护开关,并详细分析了其开断换流过程。首先介绍了失超保护系统的拓扑结构和工作原理;然后具体分析了真空断路器在开断及换流阶段的数学方程,并依据开断可靠性理论,分别对换流回路、泄能回路与缓冲回路进行了计算和参数设计;最后开展了100 kA直流电流开断实验。研究结果表明,失超保护系统中使用真空断路器开断100 kA磁体电流具有理论和工程可行性,并通过实验验证了所设计的真空断路器样机能够有效开断100 kA电流,换流过程符合预期判断。本文的研究工作为大功率失超保护系统中的直流断路器设计提供了技术支撑。

关键词：超导磁体失超保护直流开断直流真空断路器换流分析 100 kA磁体电流

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ITER直流隔离开关短路试验研究

强激光与粒子束 2017年第2期29卷 68-72页

作者：张秀青傅鹏高格宋执权中国科学院等离子体物理研究所合肥230031

基于ITER极向场变流器系统,分析了直流隔离开关短路故障,提出ITER直流隔离开关短路试验要求。基于中国科学院等离子体物理研究所直流测试平台,为ITER直流隔离开关短路试验设计了先建立直流电压再闭合短路开关的后短路试验方案,包括选取... 详细信息

基于ITER极向场变流器系统,分析了直流隔离开关短路故障,提出ITER直流隔离开关短路试验要求。基于中国科学院等离子体物理研究所直流测试平台,为ITER直流隔离开关短路试验设计了先建立直流电压再闭合短路开关的后短路试验方案,包括选取变压器档位、计算试验电流所对应的直流电压等内容。通过仿真和试验验证了试验方案的可行性,试验结果证明了直流隔离开关对短路故障的抑制能力满足ITER极向场变流器运行要求。经分析计算,350kA试验电流需要直流电压270V。在试验中,预设直流电压270V时,试验电流达不到350kA,将预设直流电压提高到300V后,试验电流峰值达到362.5kA,且超过350kA的部分达到100ms。实际预设直流电压比理论计算值大30V,这是电网电压的波动造成的。

关键词： ITER 直流隔离开关故障抑制能力短路试验试验方案

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自动化技术在大坝变形监测中的应用研究

江西建材 2018年第13期 35-36页

作者：宋智全中国水利水电第八工程局有限公司湖南长沙410004

在水利工程建设快速发展的同时对大坝质量也有了新的要求。水利工程中,大坝应用会受到地质条件影响而出现形变,严重影响水利工程建设安全。因此,为防止大坝变形应用自动化技术检测大坝状态尤为重要,现已成为大坝变形监测重要监测技术,... 详细信息

在水利工程建设快速发展的同时对大坝质量也有了新的要求。水利工程中,大坝应用会受到地质条件影响而出现形变,严重影响水利工程建设安全。因此,为防止大坝变形应用自动化技术检测大坝状态尤为重要,现已成为大坝变形监测重要监测技术,能够确保大坝稳固安全。接下来,笔者结合实践研究,就自动化技术在大坝变形监测中的应用进行简要分析。

关键词：自动化技术大坝变形监测应用研究

中国聚变工程实验堆大功率混合直流开关概念设计

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强激光与粒子束 2019年第4期31卷 55-59页

作者：汤存文李华宋执权胡星光中国科学院等离子体物理研究所电源及控制工程研究室合肥230031

中国聚变工程实验堆中的超导线圈失超保护开关要求的额定参数达到了10kV/±100kA,针对该运行参数提出了一种混合式直流开关。承担稳态通流的机械开关采用了三级触头结构,可以降低固态开关的通流时间。双向固态开关的阀串采用二极管桥与I... 详细信息

中国聚变工程实验堆中的超导线圈失超保护开关要求的额定参数达到了10kV/±100kA,针对该运行参数提出了一种混合式直流开关。承担稳态通流的机械开关采用了三级触头结构,可以降低固态开关的通流时间。双向固态开关的阀串采用二极管桥与IGBT组合的形式,结温分析证明可以提高器件的流通电流限制,并对该基本单元拓扑进行了大电流开断实验,验证了该设计的可行性。

关键词：中国聚变工程实验堆失超保护直流开关结温分析