为实现输电线路货运索道自动化设计技术,依托GIS(Geographic Information System)平台,结合三维地理信息数据,提出可自动适应地形的货运索道中间支架自动选取方法,并根据架设经济成本获得了索道路径的选取方案。提出索道结构设计计算方...为实现输电线路货运索道自动化设计技术,依托GIS(Geographic Information System)平台,结合三维地理信息数据,提出可自动适应地形的货运索道中间支架自动选取方法,并根据架设经济成本获得了索道路径的选取方案。提出索道结构设计计算方法,考虑了承载索与牵引索、承载索与载荷等多重耦合作用,建立了完整、全面的索道理论分析模型,实现了货运索道系统的耦合分析计算。分别对横梁、支腿、鞍座、运行小车、转向滑车等索道标准化部件进行结构受力分析,结合索道结构设计计算方法提出了部件选型方法,实现了索道部件三维场景可视化展示并形成索道设计施工方案。针对实际工程完成了货运索道的路径自动选取及结构设计,各项数据满足使用需求。文章提出的方法可提高货运索道设计分析效率,减少技术人员现场勘查工作量。展开更多
电网暂态过电压威胁着电力设备的安全运行,监测暂态过电压对保证电网安全、可靠运行具有重要意义。提出一种基于电容式电压互感器(Capacitor Voltage Transformer,CVT)的暂态过电压光学监测方法,通过在常规CVT的电容分压器低压端串入暂...电网暂态过电压威胁着电力设备的安全运行,监测暂态过电压对保证电网安全、可靠运行具有重要意义。提出一种基于电容式电压互感器(Capacitor Voltage Transformer,CVT)的暂态过电压光学监测方法,通过在常规CVT的电容分压器低压端串入暂态监测电容,利用光学电压传感器(Optical Voltage Sensor,OVS)实现暂态过电压的监测。建立具备暂态电压监测功能的CVT的高频暂态电路模型,分析论证了利用电容C3监测暂态电压的可行性。研制OVS样机,设计基于CVT的暂态过电压光学监测系统,并进行了暂态过电压试验,试验结果表明监测系统能满足对暂态过电压监测的需求,进一步论证了所提方案的有效性。展开更多
Corona discharge suppression for high-voltage direct-current(HVDC)transmission lines at line terminals such as converter stations is a subject that requires attention.In this paper,a method based on a conductor covere...Corona discharge suppression for high-voltage direct-current(HVDC)transmission lines at line terminals such as converter stations is a subject that requires attention.In this paper,a method based on a conductor covered with dielectric film is proposed and implemented through a bench-scale setup.Compared with the bare conductor,the corona discharge suppression effect of the dielectric-film-covered conductor under positive polarity is studied from the composite field strength and ion current density using a line-plate experimental device.The influences of film thickness and film material on the corona discharge suppression effect are investigated.The charge accumulation and dissipation characteristics of different film materials are also studied.The results show that the conductor covered with dielectric film has excellent ability to inhibit corona discharge.The ground-level composite field strength of the conductor covered with dielectric film is lower than its nominal field strength,and its ion current density is at the nA m^(−2) level.The corona threshold voltage can be promoted by increasing the film thickness,but the ability to inhibit corona discharge becomes weak.The larger the surface electric field strength,the more charge accumulated,but the faster the charge dissipation rate.Compared with polyvinyl chloride film,cross-linked polyethylene film has stronger charge accumulation ability and slower charge dissipation rate,which can better restrain the corona discharge of HVDC transmission lines.展开更多
文摘为实现输电线路货运索道自动化设计技术,依托GIS(Geographic Information System)平台,结合三维地理信息数据,提出可自动适应地形的货运索道中间支架自动选取方法,并根据架设经济成本获得了索道路径的选取方案。提出索道结构设计计算方法,考虑了承载索与牵引索、承载索与载荷等多重耦合作用,建立了完整、全面的索道理论分析模型,实现了货运索道系统的耦合分析计算。分别对横梁、支腿、鞍座、运行小车、转向滑车等索道标准化部件进行结构受力分析,结合索道结构设计计算方法提出了部件选型方法,实现了索道部件三维场景可视化展示并形成索道设计施工方案。针对实际工程完成了货运索道的路径自动选取及结构设计,各项数据满足使用需求。文章提出的方法可提高货运索道设计分析效率,减少技术人员现场勘查工作量。
文摘电网暂态过电压威胁着电力设备的安全运行,监测暂态过电压对保证电网安全、可靠运行具有重要意义。提出一种基于电容式电压互感器(Capacitor Voltage Transformer,CVT)的暂态过电压光学监测方法,通过在常规CVT的电容分压器低压端串入暂态监测电容,利用光学电压传感器(Optical Voltage Sensor,OVS)实现暂态过电压的监测。建立具备暂态电压监测功能的CVT的高频暂态电路模型,分析论证了利用电容C3监测暂态电压的可行性。研制OVS样机,设计基于CVT的暂态过电压光学监测系统,并进行了暂态过电压试验,试验结果表明监测系统能满足对暂态过电压监测的需求,进一步论证了所提方案的有效性。
基金by State Grid Shandong Electric Power Company(52062618001M)。
文摘Corona discharge suppression for high-voltage direct-current(HVDC)transmission lines at line terminals such as converter stations is a subject that requires attention.In this paper,a method based on a conductor covered with dielectric film is proposed and implemented through a bench-scale setup.Compared with the bare conductor,the corona discharge suppression effect of the dielectric-film-covered conductor under positive polarity is studied from the composite field strength and ion current density using a line-plate experimental device.The influences of film thickness and film material on the corona discharge suppression effect are investigated.The charge accumulation and dissipation characteristics of different film materials are also studied.The results show that the conductor covered with dielectric film has excellent ability to inhibit corona discharge.The ground-level composite field strength of the conductor covered with dielectric film is lower than its nominal field strength,and its ion current density is at the nA m^(−2) level.The corona threshold voltage can be promoted by increasing the film thickness,but the ability to inhibit corona discharge becomes weak.The larger the surface electric field strength,the more charge accumulated,but the faster the charge dissipation rate.Compared with polyvinyl chloride film,cross-linked polyethylene film has stronger charge accumulation ability and slower charge dissipation rate,which can better restrain the corona discharge of HVDC transmission lines.
