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Study on moisture absorption characteristics of glass fibrereinforced epoxy resin material for composite insulators based on the 3D-Fick model

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High Voltage 2024年第4期9卷 888-901页

作者： Yuming Zhang Yunpeng Liu Sizu Hou Jianghai Geng Ping Wang Hebei Provincial key laboratory of power transmission equipment Security Defense North China Electric Power UniversityBaodingChina Hebei key laboratory of power Internet of Things technology BaodingChina

Long-term exposure to moisture leads to a gradual deterioration of performance and reduced service life of glass fibre-reinforced epoxy resin(GFRP)material in composite ***,it is necessary to analyse the moisture absorption characteristics of GFRP material and the evolution of damage to their internal interface *** absorption tests on GFRP rod material used in composite insulators to obtain their three-dimensional diffusion coefficients are *** force microscopy was then employed to obtain the composite material system's fibre/matrix interfacial phase ***,a finite element model incorporating representative volume elements with interfacial phases and a mesoscale transient moisture absorption finite element model for the composite material was ***,the moisture absorption characteristics of GFRP material and the evolution of damage to the interfacial phase under thermal-humidity cycling conditions were *** results showed that the diffusion coefficient along the fibre direction in GFRP material was higher than that in the perpendicular *** moisture diffusion finite element model,incorporating an anisotropic interfacial phase,fitted the anisotropic diffusion coefficients of GFRP material more *** moisture invaded the GFRP material,the mismatch stresses continuously increased during the moisture ***,the non-uniform arrangement of fibres resulted in uneven distribution of moistureinduced stresses inside the material,leading to higher mismatch stresses in areas with dense fibre arrangements in the *** high and low humidity cycles led to the development of micro-cracks,micro-porosity,and interface debonding along the fibre direction at the GFRP material interfaces,thereby affecting the anisotropic moisture absorption characteristics of the *** findings of this study provide valuable insights into the mechanisms underlying the

关键词： composite fibre moisture

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An Adaptive Many-objective Robust Optimization Model of Dynamic Reactive power Sources for Voltage Stability Enhancement

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Journal of Modern power Systems and Clean Energy 2023年第6期11卷 1756-1769页

作者： Yuan Chi Anqi Tao Xiaolong Xu Qianggang Wang Niancheng Zhou IEEE State key laboratory of power transmission equipment and System Security and New technology Chongqing UniversityChongqing 400044China

The deployment of dynamic reactive power sourcecan effectively improve the voltage performance after a disturbance for a power system with increasing wind power penetration level and ubiquitous induction *** improve the voltage stability of the power system,this paper proposes an adaptive many-objective robust optimization model to deal with thedeployment issue of dynamic reactive power ***,two metrics are adopted to assess the voltage stability of the system at two different stages,and one metric is proposed to assess the tie-line reactive power ***,a robustness index isdeveloped to assess the sensitivity of a solution when subjectedto operational uncertainties,using the estimation of acceptablesensitivity region(ASR)and D-vine *** objectives areoptimized simultaneously:①total equipment investment;②adaptive short-term voltage stability evaluation;③tie-line power flow evaluation;④prioritized steady-state voltage stabilityevaluation;and⑤robustness ***,an anglebased adaptive many-objective evolutionary algorithm(MaOEA)is developed with two improvements designed for the application in a practical engineering problem:①adaptive mutationrate;and②elimination procedure without a requirement for athreshold *** proposed model is verified on a modifiedNordic 74-bus system and a real-world power *** results demonstrate the effectiveness and efficiency of theproposed model.

关键词： Voltage stability reactive power planning robust many-objective optimization tie-line correlated uncertainty

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Frequency-locking and threshold current-lowering effects of a quantum cascade laser and an application in gas detection field

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Chinese Physics B 2015年第2期24卷 165-169页

作者：陈伟根万福邹经鑫顾朝亮周渠 State key laboratory of power transmission equipment & System Security and New technology School of Electrical EngineeringChongqing University

In this paper,the frequency-locking and threshold current-lowering effects of a quantum cascade laser are studied and *** with cavity-enhanced absorption spectroscopy,the noninvasive detection of H_2 with a prepared concentration of 500 ppm in multiple dissolved gases is performed and *** high frequency selectivity of 0.0051 cm^-1 at an acquisition time of 1 s allows the sensitive detection of the（1-0） S（l） band of H_2 with a high accuracy of（96.53±0.29）%and shows that the detection limit to an absorption line of 4712.9046 cm^-1 is approximately（17.26±0.63） ppm at an atmospheric pressure and a temperature of 20 ℃.

关键词： quantum cascade laser frequency locking threshold current lowering cavity-enhanced absorptionspectroscopy

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Short-term transmission Maintenance Scheduling Considering Network Topology Optimization

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Journal of Modern power Systems and Clean Energy 2022年第4期10卷 883-893页

作者： Weixin Zhang Bo Hu Kaigui Xie Changzheng Shao Tao Niu Jiahao Yan Lvbin Peng Maosen Cao Yue Sun State key laboratory of power transmission equipment&System Security and New technology at Chongqing University Chongqing 400044China

With the increasing penetration of renewable energy sources,transmission maintenance scheduling(TMS)will have a larger impact on the accommodation of wind ***,the more flexible transmission network topology owing to the network topology optimization(NTO)technique can ensure the secure and economic operation of power *** paper proposes a TMS model considering NTO to decrease the wind curtailment without adding control *** problem is formulated as a two-stage stochastic mixed-integer programming *** first stage arranges the maintenance periods of transmission *** second stage optimizes the transmission network topology to minimize the maintenance cost and system operation in different wind speed *** proposed model cannot be solved efficiently with off-theshelf solvers due to the binary variables in both ***,the progressive hedging algorithm is *** results on the modified IEEE RTS-79 system show that the proposed method can reduce the negative impact of transmission maintenance on wind accommodation by 65.49%,which proves its effectiveness.

关键词： Mixed-integer linear programming network topology optimization progressive hedging algorithm stochastic optimization transmission maintenance scheduling wind curtailment

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Fractal microstructure of Ag film via plasma discharge as SERS substrates

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Chinese Physics B 2021年第12期30卷 479-483页

作者： Xue-Fen Kan Cheng Yin Zhuang-Qi Cao Wei Su Ming-Lei Shan Xian-Ping Wang jiangsu key laboratory of power transmission and distribution equipment technology Hohai UniversityChangzhou 213022China Department of Physics and Astronomy Shanghai JiaoTong UniversityShangha 200240China Department of Physics Key Laboratory of Optoelectronic and Telecommunication of Jiangxi ProvinceJiangxi Normal UniversityNanchang 330022China

According to the atmospheric pressure plasma(APP)technology,we propose a rapid synthetic approach of the substrates for enhanced Raman *** plasma is used to modify and etch the surface of silver film,which generates large scale hotspots'*** switching the discharge polarity and adjusting the film thickness,different surface morphologies are formed due to the oxidation,reactive etch and accumulation of the plasma product in a certain *** under positive corona discharge condition,dense snake-like microstructures are formed by the gradual connection of individual nanoparticles,which are driven by the influence of the electric field on surface *** addition,the experiments verify that the corresponding enhancement factor(EF)raises at least five orders of magnitude and the treatment time is about 10 min.

关键词： plasma discharge fractal microstructure surface-enhanced Raman scattering

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Numerical simulation and experimental validation of a direct current air corona discharge under atmospheric pressure

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Chinese Physics B 2012年第7期21卷 368-377页

作者：刘兴华何为杨帆王虹宇廖瑞金肖汉光 State key laboratory of power transmission equipment & System Security and New technology Chongqing University Department of Physics Anshan Normal University

Air corona discharge is one of the critical problems associated with high-voltage equipment. Investigating the corona mechanism plays a key role in enhancing the electrical insulation performance. An improved self-consistent multi-component two-dimensional plasma hybrid model is presented for the simulation of a direct current atmospheric pressure corona discharge in air. The model is based on plasma hydrodynamic and chemical models, and includes 12 species and 26 reactions. In addition, the photoionization effect is introduced into the model. The simulation on a bar-plate electrode configuration with an inter-electrode gap of 5.0 mm is carried out. The discharge voltage- current characteristics and the current density distribution predicted by the hybrid model agree with the experimental measurements. In addition, the dynamics of volume charged species generation, discharge current waveform, current density distribution at an electrode, charge density, electron temperature, and electric field variations are investigated in detail based on the model. The results indicate that the model can contribute valuable insights into the physics of an air plasma discharge.

关键词： corona discharge hybrid model discharge voltage-current characteristics current den-sity distribution

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Development of Mixed Insulation Oil as Alternative Liquid Dielectric:A Review

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CSEE Journal of power and Energy Systems 2024年第3期10卷 1242-1258页

作者： Jian Hao Jingwen Zhang Wenyu Ye Ruijing Liao Lijun Yang State key laboratory of power transmission equipment technology School of Electrical EngineeringChongqing UniversityChongqing 400044China IEEE CSEE

Use of traditional mineral oil(MO)as a liquid insulation in transformers has spanned more than 130 ***,MO has poor heat resistance,a low ignition point,and is a non-renewable resource,which does not meet development requirements for high-performance and environmentally friendly insulation ***,researchers have explored alternatives such as natural ester(NE)and synthetic ester(SE)oils,as well as mixed insulation *** insulating oil is a blend of diverse insulating oil types,with optimal performance achieved by adjusting proportions of base *** article summarizes the innovative achievements and development of mixed insulation oil in terms of development of mixed ratio,basic physical chemical properties,electrical properties,thermal stability,and application including operation and maintenance *** these efforts,this article aims to provide recommendations for future development of mixed insulating oils to advance liquid dielectric research based on enhancement mechanisms.

关键词： Environmentally friendly insulation oil ester oils high-performance mineral oil mixed insulation oils

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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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Angular-modulated spatial distribution of ultrahigh-order modes assisted by random scattering

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Chinese Physics B 2017年第11期26卷 254-257页

作者：阚雪芬殷澄许田陈凡李建韩庆邦陈险峰 jiangsu key laboratory of power transmission and distribution equipment technology Hohai University The State key laboratory on Fiber Optic Local Area Communication Networks and Advanced Optical Communication Systems Department of Physics and Astronomy Shanghai Jiao Tong University Physics Department Nantong University Optoelectronics Devices laboratory Photonlabs Inc.

In designing an optical waveguide with metallic films on a nanometer scale, the random scattering by the natural roughness of the thin film is always ignored. In this paper, we demonstrate that for the ultrahigh-order modes（UOMs） in the symmetric metal cladding waveguide, such a scattering leads to drastic variations in their spatial distribution at different incident angles. Owing to the high mode density of the UOMs, the random scattering induced coupling can be easily related to different modes with different propagation directions or wavenumbers. At small incident angles, the intra-mode coupling dominates, which results in a spatial distribution in the form of concentric rings. At large incident angles, the inter-mode coupling plays the most important role and leads to an array-like pattern. Experimental evidence via optically trapped nanoparticles support the theoretical hypothesis.

关键词： metallic waveguide random scattering optical trapping

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Chaos Control in Electromechanical Seismograph System with Noise Disturbances

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Journal of Donghua University(English Edition) 2012年第3期29卷 203-208页

作者：郑连清申滔陆治国 State key laboratory of power transmission equipment&System Security and New technology Chongqing University

In order to eliminate chaotic oscillation of electromechanical characteristics of seismograph system, the complex dynamic the four-dimensional nonlinear equations of seismograph system were analyzed. Sliding mode method was applied to stabilize the chaotic orbits of the eleetromechanieal seismograph system to arbitrary chosen fixed points and periodic orbits precisely, and MATLAB simulations were presented to confirm the validity of the controller. The results show that using sliding mode method can make the system track target orbit strictly and smoothly with short transition time, and its insensitivity to noise disturbances is shown. It also provides reference for relevant chaos control in relevant system.

关键词： electromechanical seismograph system chaotic attractor slidine mode: uncertain parameter: noise disturbance simulation

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