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高压GIS功能梯度绝缘子交/直流电场优化与沿面闪络抑制

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中国电机工程学报 2024年第8期44卷 3297-3305,I0031页

作者：董佳楠杜伯学梁虎成姚航天津大学电气自动化与信息工程学院天津市南开区300072

在双极高压直流(high voltagedirect current,HVDC)系统中,气体绝缘金属封闭开关设备(gas-insulated switchgears,GIS)可能承受交-直流混合电压。为了提高盆式绝缘子的沿面耐电性能,该文提出了基于多维功能梯度材料(multi-dimensional f... 详细信息

在双极高压直流(high voltagedirect current,HVDC)系统中,气体绝缘金属封闭开关设备(gas-insulated switchgears,GIS)可能承受交-直流混合电压。为了提高盆式绝缘子的沿面耐电性能,该文提出了基于多维功能梯度材料(multi-dimensional functionally-graded material,MFGM)的绝缘子交、直流电场协同优化方法,制备了兼具体介电常数梯度材料(ε-functionally gradient materials,ε-FGM)和表面非线性电导材料(surface nonlinear conductivity materials,SNCM)的MFGM绝缘子,并在直流、交流和交-直流混合电压下开展电场仿真计算与沿面闪络测试。结果表明:直流电压下MFGM绝缘子的凸面中心区域积聚同极性表面电荷,而周围区域积聚异极性表面电荷,使高压三结合点处的电场强度较常规绝缘子降低25%,沿面闪络电压提升约14.5%;交流电压下,MFGM绝缘子的沿面电场畸变较常规绝缘子降低21%,沿面闪络电压提升约18%;交-直流混合电压下,MFGM绝缘子可同时降低暂、稳态电场分量,沿面闪络电压提升约12.7%。MFGM绝缘子满足暂、稳态工况下的沿面电场协同优化需求,在高压直流气体绝缘装备中具有很好的应用前景。

关键词：高压直流环氧树脂绝缘子功能梯度材料电场优化闪络电压

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Electric field control by permittivity functionally graded and superficially non-linear conductivity materials for DC-GIS spacer

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High Voltage 2022年第5期7卷 992-1000页

作者： Boxue Du Jianan Dong hucheng liang School of Electrical and Information Engineering Tianjin UniversityTianjinChina

This paper offers a simulation study on the application of a novel approach to control the electric field around a basin-type spacer by combining permittivity functionally graded materials(ε-FGM)and superficially non-linear conductivity materials(SNCM),namely multi-dimensional functional materials(MDFM).The permittivity distribution of theε-FGM spacer is designed by the iteration optimization algorithm,and the epoxy/SiC composites with 30 and 60 phr doping contents are assigned as the coating materials of two SNCM spacers,namely SNCM30 and *** MDFM spacer combinesε-FGM in its bulk and SNCM60 on its *** electric field regulation effect of each functional spacer is investigated under variable conditions,that is,DC steady state(DC-steady),DC turn-on state(DC-on),DC polarity reversal(DC-PR),and DC superimposed with switching impulse voltage(DC-SI).Results show that the applicability ofε-FGM and SNCM is limited to transient and stationary conditions,*** MDFM spacer combines the advantages ofε-FGM and SNCM for adaptively relaxing the electric field under all the above *** is hoped that this research will be beneficial to the development and application of spacers for the direct current gas-insulated switchgear(DC-GIS).

关键词： composites graded field

Study on non-uniformity and dynamic fracture characteristics of GIL tri-post insulators considering Al_(2)O_(3) sedimentation

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High Voltage 2023年第4期8卷 659-667页

作者： Jin Li Songtao Liu hucheng liang Liucheng Hao Yaxiang Wang Boxue Du School of Electrical and Information Engineering Tianjin UniversityTianjinChina Pinggao Group Co. Ltd.PingdingshanChina

Tri-post insulators in gas-insulated transmission line(GIL)are usually fabricated with high mass fraction of micron aluminum oxide(Al_(2)O_(3)),which will unavoidably settle under the action of gravity during the preparation process and seriously affect the uniformity.A model of filler sedimentation in epoxy resin composite materials was proposed based on the particle size analysis and Stokes'*** scaled tri-post insulators were prepared and tested by *** is determined that the position of density concentration is the lower side of the two lower posts and the upper interface between the insulator and the *** density ranges from 2.144 to 2.346 g/cm^(3).The dynamic fracture simulation model of insulator was established and it is found that the insulator fracture occurs at the interface of upper post/insert under radial load,which is verified by *** comparing the influence of sprue position on the density distribution,it is found that the uniformity of insulators is increased by 13.7% by forward pouring compared with reverse *** research develops an accurate method for simulating the filler sedimentation and the fracture process in epoxy-based insulators,which is helpful for the improvement of mechanical reliability of GIL.

关键词： fracture insulator dynamic

Mechanical stress distribution and risk assessment of 110 kV GIS insulator considering Al_(2)O_(3)settlement

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High Voltage 2019年第1期4卷 65-71页

作者： hucheng liang Boxue Du Jin Li Zehua Wang School of Electrical and Information Engineering Tianjin UniversityWeijin Road 92TianjinPeople's Republic of China

The growing application of gas insulated switchgear(GIS)in electric power system asks for higher reliability of epoxy(EP)insulators,thus it is important to seek effective methods to improve the operating reliability of GIS *** the basis of the 110 kV GIS insulator,this study studied the aluminium oxide(Al_(2)O_(3))settlement in the curing process and the stress distribution of the horizontally laid ***,the risk coefficient was defined to evaluate the operating reliability of insulators laid by different methods(I-V).Some conclusions are shown below:the Al_(2)O_(3)settlement in the curing process causes the insulator density to have a large variation from 2.13 to 2.32 g/cm^(3).The Al_(2)O_(3)content has a great influence on the mechanical performances of EP/Al_(2)O_(3)*** first principle stress is localised on the upper interface between the insulator and the conductor,which is the main threat to the mechanical damage of *** laying method V appears to be optimal with a pretty low risk coefficient of *** actual application,for the horizontally laid GIS,the insulator should be laid with the mould gate downward to improve its mechanical reliability.

关键词： stress insulator distribution

Promising functional graded materials for compact gaseous insulated switchgears/pipelines

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High Voltage 2020年第3期5卷 231-240页

作者： Jin Li hucheng liang Yun Chen Boxue Du School of Electrical and Information Engineering Tianjin UniversityTianjin 300072People's Republic of China China Electric Power Research Institute Beijing 100192People's Republic of China

The electric field distributions along gas-solid interfaces determine the reliability,lifetimes and sizes of gaseous insulated switchgears/pipelines(GIS/GIL),which also affect the reliability of power *** this study,the characteristics of steady and transient electric field distributions were first introduced,followed by the concept of functionally graded materials(FGMs).The development histories of FGM applied in electrical engineering and the related optimisation methods were described in *** field regulation effect and fabrication technology of different FGM insulators were also *** overcome the limitations of traditional FGM insulators,the design of surface FGM(SFGM)was proposed,together with their preparation methods and electrical ***,the future development prospects of FGM and SFGM insulators for compact GIS/GIL were summarised.

关键词： FGMs graded electrical

Improved space charge transport model in bilayer dielectrics—considering carrier dynamic equilibrium

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High Voltage 2020年第2期5卷 176-183页

作者： hucheng liang Boxue Du Jin Li Hang Yao Zehua Wang Key Laboratory of Smart Grid of Education Ministry School of Electrical and Information EngineeringTianjin UniversityTianjin300072People's Republic of China

The Maxwell–Wagner model and bipolar charge transport model both aim at describing the charge transport behaviours in *** Maxwell–Wagner model performs well in calculating the polarisation current and electric field distribution,but it is too macroscopic to describe the microscopic behaviours of space *** bipolar charge transport model can well simulate the space charge accumulation,but it cannot quantitatively relate the microscopic transport behaviours with the macroscopic conductivities of *** the shortages of the above two models,an improved charge transport model,named carrier dynamic equilibrium model,was proposed in this study to simulate the polarisation process of the low-density polyethylene/ethylene propylene diene monomer bi-layer dielectric by introducing a source term of carrier dynamic *** of carrier mobility and non-equilibrium carrier lifetime on the simulation results were explored,and a comparison among the results of measurement and different models was also *** with the Maxwell–Wagner model and bipolar charge transport model,the improved model has the best coincidence with measurements,which can provide an accurate reference for the design of high-voltage direct current insulation systems.

关键词： charge equilibrium dynamic

特高压GIL非均匀热气流特性与三支柱绝缘子绝缘裕度分析

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电工技术学报 2023年第6期38卷 1678-1686页

作者：杜伯学董佳楠梁虎成智能电网教育部重点实验室、天津大学电气自动化与信息工程学院天津300072

特高压(UHV)气体绝缘输电管道(GIL)导体通流发热,使绝缘气体SF6在温度梯度场下形成对流,导致三支柱绝缘子的沿面绝缘裕度与设计产生差异,威胁特高压GIL的安全运行。为探究气体对流效应对特高压GIL三支柱绝缘子沿面绝缘性能的影响,该文... 详细信息

特高压(UHV)气体绝缘输电管道(GIL)导体通流发热,使绝缘气体SF6在温度梯度场下形成对流,导致三支柱绝缘子的沿面绝缘裕度与设计产生差异,威胁特高压GIL的安全运行。为探究气体对流效应对特高压GIL三支柱绝缘子沿面绝缘性能的影响,该文建立了水平敷设的1100kV GIL三支柱绝缘子电场-温度场-流体耦合仿真模型,考虑电场和气体密度的影响,计算了三支柱绝缘子放电起始电压。结果表明:大负荷条件下(8000A)GIL导体温度升高53℃,周围气体密度和介电强度下降15%,电场强度设计基准需同比例降低15%以保证足够的绝缘裕度;负荷导致放电起始电压降低11.6%,由于气体受热上浮,绝缘子上支柱周围的气体密度和介电强度均低于底部区域,更容易发生气体放电。因此,气体对流效应对特高压GIL绝缘性能的影响不能忽略,需要针对运行工况对结构及参数作进一步优化。

关键词：特高压GIL 气体对流三支柱绝缘子绝缘裕度起始电压

直流GIL表层功能梯度绝缘子参数设计与电场优化

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高压电器 2023年第9期59卷 106-112页

作者：姚航杜伯学梁虎成董佳楠天津大学电气自动化与信息工程学院智能电网教育部重点实验室天津300072

为调控直流稳态与极性反转工况下直流气体绝缘输电线路(HVDC GIL)绝缘子的沿面电场分布,分别设计了稳态梯度(ST-SFGM)绝缘子与极反梯度(PR-SFGM)绝缘子。迭代优化后的SFGM绝缘子涂层电导率恒定,厚度沿r坐标方向减小。电场仿真结果表明,... 详细信息

为调控直流稳态与极性反转工况下直流气体绝缘输电线路(HVDC GIL)绝缘子的沿面电场分布,分别设计了稳态梯度(ST-SFGM)绝缘子与极反梯度(PR-SFGM)绝缘子。迭代优化后的SFGM绝缘子涂层电导率恒定,厚度沿r坐标方向减小。电场仿真结果表明,直流稳态工况下均匀绝缘子的最大电场出现在高压三结合点附近,强度为4.25 kV/mm。ST-SFGM绝缘子与PR-SFGM绝缘子的直流电场分布较为均匀,最大电场强度分别下降54.6%与62.1%。极性反转工况下,均匀绝缘子与ST-SFGM绝缘子的电场畸变加剧,最大电场强度分别提升1.09和3.44倍,而PR-SFGM绝缘子的最大电场强度则基本保持不变。

关键词：直流极性反转功能梯度绝缘子参数设计电场调控

气体绝缘直流设备气固界面电场分布特性与调控方法研究进展

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高电压技术 2019年第8期45卷 2619-2628页

作者：李进梁虎成杜伯学天津大学电气自动化与信息工程学院

气体绝缘高压直流输电管道与开关设备(GIL/GIS)已成为新能源规模化利用和增强自然灾害抵抗能力的重点发展方向。气固界面电场分布是目前直流GIL/GIS均压设计面临的难题,因此,研究气体绝缘直流设备的电场分布特性和调控方法具有重要意义... 详细信息

气体绝缘高压直流输电管道与开关设备(GIL/GIS)已成为新能源规模化利用和增强自然灾害抵抗能力的重点发展方向。气固界面电场分布是目前直流GIL/GIS均压设计面临的难题,因此,研究气体绝缘直流设备的电场分布特性和调控方法具有重要意义。文章首先介绍了气体绝缘直流设备中表面电荷积聚和缺陷存在对绝缘子表面稳态电场分布的影响规律,以及在开断操作和暂态过电压作用下绝缘子表面电场分布的暂态过渡过程;其次,从材料介电参数改性和表面改性两大方面对目前常用的绝缘子电场调控手段进行了分析,并提出了表面功能梯度材料的概念及其在直流电场调控方面的应用;最后,从电场调控、闪络抑制效果以及工业成本等角度对各种电场调控手段进行了综合对比,并对未来气体绝缘直流设备电场调控手段的研究和发展方向进行了展望。

关键词：气体绝缘直流设备气固界面电场分布电场调控表面改性技术表面功能梯度材料