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Cryogenic Electrical Tree Characteristics of Epoxy Resin for HTS Power Equipment Under DC/Impulse Superimposed Voltage

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IEEE Transactions on Dielectrics and Electrical Insulation 2025年第3期32卷 1422-1431页

作者： Xing, Yunqi Xiao, Kunran Zhao, Yuqiang Huang, Rongjin Zheng, Jingquan Hebei University of Technology State Key Laboratory of Reliability and Intelligence of Electrical Equipment Tianjin300131 China Bingtuan Xingxin Vocational and Technical College Urumqi830074 China Technical Institute of Physics and Chemistry Chinese Academy of Sciences Key Laboratory of Cryogenic Science and Technology Beijing100190 China North China Electric Power University State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources Beijing102206 China

Epoxy resin (EP) for current lead insulation in superconducting equipment offers advantages such as low costs, high chemical stability, and excellent electrical and insulation properties. However, during operation, the combined effects of complex voltage and a wide temperature range from room temperature to 77 K can easily induce partial discharge, leading to insulation faults and posing a threat to the safety and stability of the power system. In this work, we conducted electrical tree tests on bisphenol F EP to investigate the influence of environmental temperature, voltage forms, impulse frequency, and other factors on the inception and growth characteristics of electrical tree. The results indicate that low temperature can effectively inhibit the inception and growth of electrical tree in EP. Continuous dc voltage application affects traps, making superimposed voltage more likely to promote electrical tree growth than a single impulse voltage at 300 K. The impulse voltage component dominates in the superimposed voltage, and its polarity significantly affects electrical tree characteristics, though the mechanisms differ. Additionally, the form of voltage superposition influences electrical tree characteristics. The promotion effect of heteropolar superposition voltage on electrical tree is slightly lower than that of homopolar superposition voltage, but the influence is not as obvious as that of positive and negative polarity. © 1994-2012 IEEE.

关键词： Chemical equipment

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Carbody sway behaviour of railway vehicles due to track irregularity from rail alternate side wear

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Railway Engineering Science 2025年第1期33卷 27-42页

作者： Lai Wei Jing Zeng Ren Luo Feng Gan Jijun Gong Jun Jiang State Key Laboratory of Rail Transit Vehicle System Southwest Jiaotong UniversityChengdu 610031China China Railway Materials Operation and Maintenance Technology Co.Ltd. Beijing 100071China

Track irregularity from rail alternate side wear is manifested as uneven rail wear waveforms alternating in the left and right rails with equal intervals,which will cause carbody sway behaviour of railway vehicles and greatly influences the passenger *** this work,the carbody sway behaviour and mechanism due to track irregularity from rail alternate side wear and possible solutions to this issue were studied by the field testing and numerical calculation ***,the carbody sway of an urban rail transit train is introduced with full-scale field tests,through which the rail alternate side wear is characterized and the formatted track irregularity are ***,multibody vehicle dynamic models are developed to reproduce the carbody sway behaviour induced by the track irregularity from the rail alternate side *** creep forces acting on the wheel and rail are preliminarily discussed to study the influence of the carbody sway on the wear of the wheel flange and the rail ***,some potential solutions,*** the damping ratio of carbody rigid mode and rail grinding,are proposed to relieve this *** is concluded that an increased damping ratio of the carbody mode can alleviate the carbody sway and wheel–rail interactions,while properly maintaining track conditions can improve the vehicle performance.

关键词： Carbody sway Track irregularity Rail wear Creep force Carbody mode

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Raman spectroscopy based detection of corrosive sulfur in transformer oil:Method and application

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High Voltage 2022年第6期7卷 1175-1184页

作者： Ziyi Wang Ruimin Song Weigen Chen Xinyuan Zhang Pinyi Wang State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqingChina

In order to overcome the shortcomings of traditional methods for corrosive sulfur detection in transformer oil,Raman spectroscopy based detection is proposed in this *** widely concerned corrosive sulfur,Dibenzyl Disulfide(DBDS),was chosen as the characteristic molecule to be detected.A series of oil samples with different DBDS concentrations was *** these samples were extracted by 1-methyl-2-pyrrolidinone for DBDS enrichment to improve the sensitivity of *** Raman spectra of samples were obtained,and a linear model was established by analysing the relationship between the characteristic peak and the DBDS *** limit of detection reached 7.98 mg/*** determining the DBDS concentrations causing sulfur corrosion,the sulfur weight content on the copper conductor surface was measured by Scanning Electron Microscope-Energy Dispersive Spectrometer after a corrosion *** results show that the corrosion limitation highly depends on the type of transformer oil,and the Raman spectroscopy detection can meet the limit of detection requirement in practical ***,an on-site oil sample and five Lab-made samples were detected via our new method and the current Gas Chromatography-Mass Spectrometry based *** is found that there is no significant divergence between the measurement *** good applicability was also demonstrated in onsite sample test.

关键词： corrosion sulfur spectroscopy

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Non-convexity Pricing and Allocating Costs in Stochastic Electricity Markets

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CSEE Journal of Power and Energy systems 2024年第4期10卷 1466-1477页

作者： Wei Lin Zhifang Yang Department of Electrical Engineering The Hong Kong Polytechnic UniversityHong Kong SARChina State Key Laboratory of Power Transmission Equipment&System Security and New Technology College of Electrical EngineeringChongqing UniversityChongqing 400030China

Stochastic electricity markets have drawn attention due to fast increase of renewable *** results in two issues:one is to reduce uplift payments arising from non-convexity under renewable uncertainties,and the other one is to allocate reserve costs based on renewable *** resolve the first issue,a convex hull pricing method for stochastic electricity markets is *** dual variables of system-wide constraints in a chance-constrained unit commitment model are shown to reduce expected uplift payments,together with developing a linear program to efficiently calculate such *** resolve the second issue,an allocation method is proposed to allocate reserve costs to each renewable power plant by explicitly investigating how renewable uncertainties of each renewable power plant affect reserve *** proposed methods are validated in a 24-period 3-unit test example and a 24-period 48-unit utility example.

关键词： Convex hull pricing cost allocation non-convexity renewable uncertainty stochastic electricity market

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Design and Experimental Evaluation of WLR-III

Design and Experimental Evaluation of WLR-III

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2023 IEEE International Conference on robotics and Biomimetics, ROBIO 2023

作者： Li, Xu Fu, Yili Zhejiang University State Key Laboratory of Robotics and System Harbin Institute of Technology State Key Laboratory of Fluid Power and Mechatronic Systems China Harbin Institute of Technology Intelligent Robot Research Center Zhejiang Laboratory State Key Laboratory of Robotics and System Heilongjiang Province Harbin150001 China

ISBN: (纸本)9798350325706

This paper introduces the design and experimental evaluation of WLR-III, which stands for the third-generation hydraulic wheel-legged robot. WLR-III is expected to be applied to disaster scenarios where the mobility, adaptability and manipulation capability are required. Based on the development of the previous two generations of wheel-legged robots, this work continuously optimizes the design to achieve higher mobility and stronger adaptability by reducing weight & inertia. The hydraulic power transmission system adopts a hose-less design method to ensure the robustness of the system. What's more prominent is that the successful development of hydraulic power unit (HPU) enables WLR-III to realize hydraulic power autonomy. In addition, to accomplish all kinds of operational tasks in the rescue scene, the electro-hydraulic hybrid drives anthropomorphic arms with heavy load grippers were developed. Finally, the effectiveness and reliability of design optimization have been evaluated through a series of experiments, including grassland movement, load bearing, obstacle-stepping and tool-operating. To the authors' best knowledge, this is the first time that a hydraulic powered autonomous wheel-legged humanoid robot with the ability to operate simple tools has been developed. © 2023 IEEE.

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Electrohydrodynamic printing for high resolution patterning of flexible electronics toward industrial applications

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InfoMat 2024年第2期6卷 28-56页

作者： Zhouping Yin Dazhi Wang Yunlong Guo Zhiyuan Zhao Liqiang Li Wei Chen Yongqing Duan State Key Laboratory of Intelligent Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhanthe People's Republic of China Optics Valley Laboratory Wuhanthe People's Republic of China Key Laboratory for Micro/Nano Technology and System of Liaoning Province Dalian University of TechnologyDalianthe People's Republic of China Beijing National Laboratory for Molecular Sciences Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijingthe People's Republic of China Institute of Molecular Aggregation Sciences Tianjin UniversityTianjinthe People's Republic of China

Electrohydrodynamic(EHD)printing technique,which deposits micro/nanostructures through high electric force,has recently attracted significant research interest owing to their fascinating characteristics in high resolution(<1μm),wide material applicability(ink viscosity 1–10000 cps),tunable printing modes(electrospray,electrospinning,and EHD jet printing),and compatibility with flexible/wearable *** the laboratory level of the EHD printed electronics'resolution and efficiency is gradually approaching the commercial application level,an urgent need for developing EHD technique from laboratory into industrialization have been put ***,we first discuss the EHD printing technique,including the ink design,droplet formation,and key technologies for promoting printing efficiency/*** we summarize the recent progress of EHD printing in fabrication of displays,organic field-effect transistors(OFETs),transparent electrodes,and sensors and ***,a brief summary and the outlook for future research effort are presented.

关键词： display electrohydrodynamic printing flexible electronics organic field-effect transistor printhead

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Large-scale plasma grafts voltage stabilizer on hexagonal boron nitride for improving electrical insulation and thermal conductivity of epoxy composite

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High Voltage 2023年第3期8卷 550-559页

作者： Penghao Zhang Chenguo Yao Liang Yu Xuetong Zhao Lisheng Zhao Linghan Lan Shoulong Dong State Key Laboratory of Power Transmission Equipment and System Security and New Technology School of Electrical EngineeringChongqing UniversityChongqingChina School of Energy and Power Engineering Chongqing UniversityChongqingChina

Better electrical insulation and thermal management are both urgently required in integrated power *** insulation epoxy encapsulation suffers from poor heat conduction,which has increasingly become a bottleneck of power semiconductors *** incorporating high thermal conductivity ceramics,such as hexagonal boron nitride(hBN),aluminium nitride *** epoxy promotes the thermal conductivity,the eco-friendly scalable fabrication of these composites with sufficient electrical breakdown strength remains a formidable *** voltage stabilizers are known to provide additional benefits to breakdown ***,a highthroughput approach combining plasma with roll-to-roll was *** voltage stabilizer(acetophenone)was grafted on interfaces between hBN and epoxy matrix through *** high-energy electrons are consumed by the grafted interface,which leads to the significant suppression of partial discharge in Epoxy/***,interfacial phonon scattering is repaired by ***,the epoxy composite concurrently exhibits improved breakdown strength(by 27.4%)and thermal conductivity(by 142.9%)at about 11.9 wt.%filler content,outperforming the pure ***,a promising modification strategy for mass production is provided for the encapsulation materials in various high-power-density semiconductor devices.

关键词： composite conductivity insulation

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Enhanced thermoelectric performance of SmS by Se alloying and Y doping 4

Enhanced thermoelectric performance of SmS by Se alloying an...

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4th International Conference on Mechanical, Electronics, and Electrical and Automation Control, METMS 2024

作者： Liao, Huijun Huang, Zhengyong Jian, Li State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing400030 China

ISBN: (数字)9781510679887

ISBN: (纸本)9781510679870

Rare-earth sulfide SmS is verified to be a potential high-temperature thermoelectric material. However, the relatively high thermal conductivity limits its performance. Although Se alloying can effectively reduce the thermal conductivity, the bandgap becomes wider at the same time and more carrier concentration is required to optimize the electrical performance. A series Sm1-xYxS0.77Se0.23 (x =0, 0.03, 0.05, 0.07, 0.1) was synthesized by ball-milling combined hot-pressing. X-ray powder results showed all Y-doped samples of Sm1-xYxS0.77Se0.23 contains tiny Sm3S4 phase. When x 0.97Y0.03S0.77Se0.23 reaches 1.42 mW/m K2 at 1023 K. The thermal conductivity of Sm1-xYxS0.77Se0.23 (x © 2024 SPIE.

关键词： Carrier concentration

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Mechanical switches integrated sandwich triboelectric nanogenerator with high instantaneous output power 2

Mechanical switches integrated sandwich triboelectric nanoge...

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2nd International Conference on Frontier Materials, ICFM 2023

作者： Wu, Han Liao, Ruijin Wang, Jiyu State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing University Chongqing400044 China

Triboelectric nanogenerator (TENG) has emerged as a promising energy harvester that converts random mechanical energy in the environment into electricity to enable self-powered system construction. However, the conventional TENG exhibits a large internal resistance resulting in a low output power across external loads for practical application. In this work, the travel mechanical switches were integrated into the TENG to boost output power, where the switches were turned on and off by the periodic motion between the triboelectric layers. Moreover, the triboelectric layers of TENG were developed as contact separation sandwich structures to work with mechanical switches, allowing the device to release the co-accumulated charges from the dual triboelectric layer to yield giant instantaneous discharge. Compared to a conventional TENG, the device offers ∼2.8 times more transfer charge in one cycle and ∼106 times more instantaneous power at an external load of 500 ω, which renders the internal impedance match almost negligible. As a result, the high-power source demonstrates the ability to illuminate the commercial lamps in parallel (total power: 50 W). Such a unique TENG with high output power for low resistance load could greatly enrich the practical application fields of self-powered systems. © 2023 Published under licence by IOP Publishing Ltd.

关键词： Nanogenerators

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32 Tb/s Real-Time C6T+L6T Unrepeated 400G QPSK Transmission over a 50.3-dB Span Loss G.652.D Fiber using Bidirectional Raman Amplification

32 Tb/s Real-Time C6T+L6T Unrepeated 400G QPSK Transmission ...

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2024 Asia Communications and Photonics Conference, ACP 2024 and International Conference on Information Photonics and Optical Communications, IPOC 2024

作者： Wu, Nishan Wang, Hongya Yu, Wenbo Shi, Hu WDM System Department State Key Laboratory of Mobile Network and Mobile Multimedia Technology ZTE Corporation Wuhan China

This paper first demonstrates a C6T+L6T 400G QPSK unrepeated transmission with the capacity of 32 Tb/s (80× 400 Gb/s) over 50.3-dB span loss G.652.D fiber, utilizing standard commercial C6T+L6T optical system and... 详细信息

ISBN: (纸本)9798350379266

关键词： Optical systems

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