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Research on the distributed capacitance for high-voltage key components on CRAFT NNBI

Plasma Science and Technology 2025年第4期27卷 58-63页

作者： Bo LIU Zhimin LIU Caichao JIANG Sheng LIU Junjun PAN Shiyong CHEN Wei WEI Yuchen QU Lizhen LIANG Ruoxin BAI Yuanlai XIE 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 College of Astronautics Nanjing University of Aeronautics and AstronauticsNanjing 210016People’s Republic of China

The negative ion based neutral beam injector(NNBI)with a beam energy of 400 keV is one of the subsystems at the Comprehensive Research fAcility for Fusion Technology(CRAFT)in *** distributed capacitance of the high-voltage components is an important basis for the design of surge suppression devices at CRAFT *** study conducted calculations of distributed capacitance for the key components,including the high-voltage deck,transmission line and isolation transformer in the power supply system using the finite element *** relationship between the high-voltage deck(HVD)distributed capacitance and the distance from the wall is *** differences in distributed capacitance and energy storage between noncoaxial and coaxial transmission lines are also ***,the capacitance between the primary and secondary windings of the-400 kV isolation transformer,as well as between the secondary winding and the oil tank casing,was calculated.

关键词： NNBI power supply system direct-current high voltage distributed capacitance finite elements analysis(Some figures may appear in colour only in the online journal)

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Calculation Method for distributed capacitance of Planar Spiral Coils in MHz Wireless Power Transfer System 2

Calculation Method for Distributed Capacitance of Planar Spi...

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2nd IEEE International Power Electronics and Application Symposium, PEAS 2023

作者： He, Qing Lan, Yujie Zhang, Xu Yang, Fenggang Chen, Qingbin Chen, Wei College of Electrical Engineering and Automation Fuzhou University Fuzhou China

ISBN: (纸本)9798350313765

The presence of high-frequency parameters in the magnetic coupling coil of the MHz class Wireless Power Transfer (WPT) system significantly affects the transmission performance of the system and poses a challenge to the advancement of high-frequency WPT technology. Through the circuit response model of the S/S type WPT system, it finds that the high-frequency capacitance of the coil impacts the constant current output characteristics of the system. Therefore, it is imperative to establish a calculation model for the high-frequency distributed capacitance of the planar coil. This paper presents a novel approach to computing the inter-turn capacitance of a coil based on the electromagnetic field theory. The method is capable of accurately determining the capacitance between non-adjacent turns by applying a charge to the coil, thereby enhancing the precision of the distributed capacitance calculation. The proposed technique's accuracy is validated through the finite element simulation results. © 2023 IEEE.

关键词： distributed capacitance High-frequency parasitic parameter modeling Magnetic coupling coil Wireless power transfer

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An Analytical Model for distributed capacitance in Up-Down Series Stacked Inductors

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IEEE TRANSACTIONS ON ELECTRON DEVICES 2020年第9期67卷 3510-3515页

作者： Tayenjam, Sobhana Vanukuru, Venkata Sundaram, Kumaravel Vellore Inst Technol Sch Elect Engn SENSE Dept Micro & Nanoelect Vellore 632014 Tamil Nadu India GLOBALFOUNDRIES Bengaluru 560045 India

Up-down series stacked inductors (UDSSIs) are known to have higher self-resonant frequency (SRF) when compared to standard series stacked inductors (SSSIs). In this article, a physics-based distributed capacitance model is presented to accurately estimate the inter-layer parasitic capacitance in both these configurations. Based on our analytical formulations, it is revealed that the total capacitance reduces substantially with increasing spiral turns in UDSSI, which is in turn responsible for increased SRF and inductor figure of merit (FOM). The importance of substrate resistivity and interlayer dielectric thickness in further improved inductor FOM with UDSSI configuration is also demonstrated. Prototype inductors using SSSI and UDSSI configurations are fabricated in 0.35-mu m BiCMOS technology. The measured results showed a 70% improvement in SRF with UDSSI structure while achieving inductance, quality factor, and FOM values of 31.54 nH, 12.34, and 4.4, respectively.

关键词： distributed capacitance self-resonant frequency (SRF) up-down series stacked inductors (UDSSIs)

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Analysis and evaluation of distributed capacitance of multiple cables on secondary circuit

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FRONTIERS IN ENERGY RESEARCH 2022年 10卷

作者： Qian, Yucun Yang, Bo Zeng, Kaidi Zhang, Hao Jiao, Yingying Huang, Xuyong Yu, Hui Qu, Shaojun Zhu, Mengmeng Kunming Univ Sci & Technol Fac Elect Power Engn Kunming Yunnan Peoples R China Tianjin Univ Tianjin Int Engn Inst Tianjin Peoples R China Nanjing Univ Aeronaut & Astronaut Coll Automat Engn Nanjing Peoples R China Shandong Jianzhu Univ Sch Informat & Elect Engn Jinan Peoples R China Yunnan Power Grid Co Ltd Elect Power Res Inst Kunming Yunnan Peoples R China Yunnan Power Grid Co Ltd Honghe Power Supply Bur Honghe Peoples R China

Due to the increasing number of new energy power generation, the converter station is widely set up at the junction of power generation, transmission and distribution because it can effectively convert AC and DC [1]. Therefore, the converter station for the safe and stable operation of the power grid and protection is particularly important. In order to accurately identify and effectively control faults, there are many secondary circuits composed of control cables and relays in converter stations, so the anti-interference ability of secondary circuits is particularly important [2]. distributed capacitance is a kind of distributed parameter formed by non-capacitance form. distributed capacitance is formed between any two insulation conductors with voltage difference in the circuit, but the size of distributed capacitance is different. In general, the distributed capacitance is small and has little influence on the circuit, especially in low frequency and short circuit [3], its influence on the circuit can be ignored. Although the value of distributed capacitance is very small, it sometimes brings interference to the normal work of transmission lines or equipment, especially at high frequencies and long lines [4].With the increasing application of modern industrial automation technology, it is necessary to centrally control the external electrical equipment, which is bound to increase the length of the control cable [5]. The influence of the distributed capacitance between the cable core wires and between the core wires and the shielding layers, especially the distributed capacitance of the control cable, cannot be ignored [6]. In particular, the power of the new relays and contactors is getting smaller and smaller, and the coil impedance is very high. When they are used, the influence of the capacitive current between the cable cores on the AC control circuit is more obvious [7].In order to solve this problem, many scholars have proposed different methods. For exampl

关键词： cable distributed capacitance secondary circuit DC relay

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Analytical computation of distributed capacitance for NFC coil antenna

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IEICE ELECTRONICS EXPRESS 2017年第2期14卷 20161147-20161147页

作者： Jin, Xin Wang, Qun Khan, Waheed Q. Tang, Zhang H. Yao, Xiao M. Beijing Univ Technol Inst Mat Sci & Engn 100 Ping Le Yuan Beijing 100124 Peoples R China

A new method for formulating the equivalent distributed capacitance of NFC coil antenna is proposed. This method is based on an analytical approach by conformal mapping for quantifying the capacitance per unit length and then applied the capacitance network method for calculating the equivalent distributed capacitance. The results of this method are verified with simulated and measured results of two different types of antenna and the agreement is >91%. It is also tested that the capacitance between nonadjacent turns cannot be ignored in the equivalent distributed capacitance computation. Furthermore, the effects of the coil width and gap between the two adjacent coils are predicted in calculating the equivalent distributed capacitance for a specific coil antenna. The proposed method will be useful for designing NFC coil antennas with a better accuracy of capacitance.

关键词： capacitance network conformal mapping distributed capacitance NFC

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Influence Analysis of distributed capacitance on Tripping Relay and Relevant Control Measures

Influence Analysis of Distributed Capacitance on Tripping Re...

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IEEE International Conference on Cyber Technology in Automation, Control, and Intelligent Systems

作者： LEI Xing DONG Zhiyun XU Nan CHEN Han Maintenance Company Shanghai Municipal Electric Power Company

ISBN: (纸本)9781538604915

Eighteen counter measures make the corresponding requirements of relay action power and action voltage from the view of design, but if DC grounding fault or AC intruding happen, while distribution capacitance of control cables exceeds the critical value, the export relay may malfunction. In this paper, the on-line monitoring system of distributed capacitance of control cables is built to realize the early warning of the risk: firstly, the low-frequency alternating current signal is injected into the DC system, then the AC current value is measured and the distributed capacitance is calculated, finally the measured value is compared with the critical value. In order to measure the distributed capacitance accurately and steadily, a small AC and DC measurement CT is designed based on magnetic saturation principle and flux induction principle. Based on constant resistance mode of DC electronic load, a voltage equalization module is designed to balance DC Bus voltage. The scheme relies on the reliable microcomputer insulating monitor and portable detector to further develop, with high economy and safety. The site is running well good, to avoid the adverse effects of distributed capacitance of the cable on export relay.

关键词： distributed capacitance DC grounding Action power Action voltage Bus voltage distributed capacitance DC SYSTEMS link voltage Critical value relay ALTERNATING CURRENT early warning impact assessment

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Extraction of distributed capacitance for Microstrip Lines Using Conformal Technique Based on Finite-Difference Method 11

Extraction of Distributed Capacitance for Microstrip Lines U...

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11th International Symposium on Antennas, Propagation and EM Theory (ISAPE)

作者： Sun, Yaxiu Wang, Xiaomeng Harbin Engn Univ Coll Informat & Commun Engn Harbin Peoples R China

ISBN: (纸本)9781509047437

In this paper, a novel method using conformal technique of finite-difference method (FDM) is proposed to solve the distributed capacitance for microstrip lines. Instead of deriving the average dielectric constant epsilon, this method uses electric field numerical weights to process the inhomogeneous cells, and takes the discontinuous effects of both inhomogeneous Ampere cell and Faraday cell into account. The new method shows good agreement with the measurement and traditional methods.

关键词： finite-difference method (FDM) conformal technique distributed capacitance

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Interwinding distributed capacitance and Guitar Pickup Transient Response

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IEEE TRANSACTIONS ON MAGNETICS 2015年第3期51卷 1-4页

作者： Kotiuga, Peter Robert Boston Univ Dept Elect & Comp Engn Boston MA 02215 USA

Simple RLC circuit models of guitar pickups do not account for audible features that characterize the pickup. Psychoacoustic experiments reveal that any acoustically accurate model has to reproduce the first 30 ms of the transient response with extreme precision. The proposed model is impractical for simple-minded model reduction or brute force numerical simulations yet, by focusing on modeling electromagnetic details and exposing a connection to spectral graph theory, a framework for finding the transient response to sufficient accuracy is exposed.

关键词： distributed capacitance spectral graph theory transient response

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Analysis of the Influence to Fault Detecting of DC System from distributed capacitance 5

Analysis of the Influence to Fault Detecting of DC System fr...

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IEEE International Conference on Cyber Technology in Automation, Control, and Intelligent Systems (CYBER)

作者： Dong Zhiyun Lei Xing Liu Gaoyuan Ding Hongnin Xu Zhaode Shanghai Municipal Elect Power Co Maintenance Co Shanghai Peoples R China Shenzhen Auto Motion Elect Power Equipment Co Ltd Shenzhen Peoples R China

ISBN: (纸本)9781479987306

Inject signal is the most popular method used for fault detecting in the DC system. However, it usually misjudges faults due to the existence of distributed capacitance in substations. In this paper, the EHV substation secondary cable laying is considered, and typical capacitance and resistance values of secondary cable to the ground are used. We analyse the influence of distributed capacitance on fault detection when the injected signal is a low-frequency square wave. And then the integral method based on the inject signal is proposed, which can distinguish fault branches from non-fault branches. Furthermore, the influence of the time constant and injected signal frequency is discussed.

关键词： distributed capacitance Inject Signal Integral Method Action Power Signal Frequency DC Grounding

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Analysis of the Influence to Fault Detecting of DC System from distributed capacitance

Analysis of the Influence to Fault Detecting of DC System fr...

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IEEE International Conference on Cyber Technology in Automation, Control, and Intelligent Systems

作者： DONG Zhiyun LEI Xing LIU Gaoyuan DING Hongnin XU Zhaode Maintenance Company Shanghai Municipal Electric Power Company Shenzhen Auto Motion Electric Power Equipment Co. Ltd

ISBN: (纸本)9781479987313

关键词： distributed capacitance Inject Signal Integral Method Action Power Signal Frequency DC Grounding distributed capacitance Integral Methods DC SYSTEMS impact assessment Defect detection time constant faults signal injection Substations

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