由500 kV G IS隔离闸刀操作而引起的特高频暂态过电压(VFTO)是大电网安全运行的重要隐患之一。通过EMTP软件仿真和华东天荒坪抽水蓄能电厂现场实测,研究了VFTO产生的原因与机理,讨论了现有的VFTO应对措施,首次提出了不改造现有设备的条...由500 kV G IS隔离闸刀操作而引起的特高频暂态过电压(VFTO)是大电网安全运行的重要隐患之一。通过EMTP软件仿真和华东天荒坪抽水蓄能电厂现场实测,研究了VFTO产生的原因与机理,讨论了现有的VFTO应对措施,首次提出了不改造现有设备的条件下,减少VFTO及其影响的电气调度操作的反措方法,并通过运行实践验证了反措的有效性。展开更多
During cold rolled production of steel, each change of rolls causes a halt in production and affects the roll＇ s grinding maintenance and consumption. Consequently,rolls are very critical to the costs of steel produc...During cold rolled production of steel, each change of rolls causes a halt in production and affects the roll＇ s grinding maintenance and consumption. Consequently,rolls are very critical to the costs of steel production. Besides the rolling accidents, surface quality problems, including inhomogeneous wear and a decrease of the surface roughness of the rolls are other main reasons for outage and a change of the rolls. Therefore, safe rolls, with superior wear resistance and roughness retentivity will be a future trend in the cold rolling steel industry. In this study, the property characteristics and in-service performance of high-speed steel （HSS） cold rolling work rolls at Baosteel are discussed. The results of this study indicate that in-service performance of HSS cold work rolls has an improvement over conventional rolls. Implementation of HSS work rolls will prolong the rolling campaign and improve the rolling stability, thus, the cost of cold rolling production can be better controlled.展开更多
Considering the actual operating experience of the Daode Wind Farm, this paper analyzes the rea-sons for the fault of the lO-kV switch cabinet. Some technical improvements and management measures, such as implementing...Considering the actual operating experience of the Daode Wind Farm, this paper analyzes the rea-sons for the fault of the lO-kV switch cabinet. Some technical improvements and management measures, such as implementing the anti-accident technical measures, improving the installation and debugging level, and strengthening operation inspection, are proposed.展开更多
国家电力调度通信中心(简称国调)承担着特大规模交直流混合运行的全国互联电网的调度管理任务。文章介绍了国调调度员培训模拟系统(dispatcher training simulator,DTS)的技术路线、软硬件结构,详细阐述了其突出的技术特点,内容包括:22...国家电力调度通信中心(简称国调)承担着特大规模交直流混合运行的全国互联电网的调度管理任务。文章介绍了国调调度员培训模拟系统(dispatcher training simulator,DTS)的技术路线、软硬件结构,详细阐述了其突出的技术特点,内容包括:220kV外网准确自动拼接建模、在线精确仿真、多回交直流混合运行电力系统仿真、HVDC详细模型仿真、国调DTS与网调DTS互联协同仿真、基于安全模式下WEB交互操作的跨级调度联合反事故演习等。展开更多
文摘由500 kV G IS隔离闸刀操作而引起的特高频暂态过电压(VFTO)是大电网安全运行的重要隐患之一。通过EMTP软件仿真和华东天荒坪抽水蓄能电厂现场实测,研究了VFTO产生的原因与机理,讨论了现有的VFTO应对措施,首次提出了不改造现有设备的条件下,减少VFTO及其影响的电气调度操作的反措方法,并通过运行实践验证了反措的有效性。
文摘During cold rolled production of steel, each change of rolls causes a halt in production and affects the roll＇ s grinding maintenance and consumption. Consequently,rolls are very critical to the costs of steel production. Besides the rolling accidents, surface quality problems, including inhomogeneous wear and a decrease of the surface roughness of the rolls are other main reasons for outage and a change of the rolls. Therefore, safe rolls, with superior wear resistance and roughness retentivity will be a future trend in the cold rolling steel industry. In this study, the property characteristics and in-service performance of high-speed steel （HSS） cold rolling work rolls at Baosteel are discussed. The results of this study indicate that in-service performance of HSS cold work rolls has an improvement over conventional rolls. Implementation of HSS work rolls will prolong the rolling campaign and improve the rolling stability, thus, the cost of cold rolling production can be better controlled.
文摘Considering the actual operating experience of the Daode Wind Farm, this paper analyzes the rea-sons for the fault of the lO-kV switch cabinet. Some technical improvements and management measures, such as implementing the anti-accident technical measures, improving the installation and debugging level, and strengthening operation inspection, are proposed.
文摘国家电力调度通信中心(简称国调)承担着特大规模交直流混合运行的全国互联电网的调度管理任务。文章介绍了国调调度员培训模拟系统(dispatcher training simulator,DTS)的技术路线、软硬件结构,详细阐述了其突出的技术特点,内容包括:220kV外网准确自动拼接建模、在线精确仿真、多回交直流混合运行电力系统仿真、HVDC详细模型仿真、国调DTS与网调DTS互联协同仿真、基于安全模式下WEB交互操作的跨级调度联合反事故演习等。
