750kV输变电示范工程操作暂态过电压现场实测与计算分析  

Analysis on Measured and Calculated Results of the Switching Surge in 750kV Transmission Pilot Project

作　　者：蒋卫平[1] 朱艺颖[1] 吴娅妮[1] 曾昭华[1] 班连庚[1] 解秀余[2] 

机构地区：[1]中国电力科学研究院,北京市海淀区100085 [2]陕西电力科学研究院,陕西省西安市710054

出　　处：《电网技术》2006年第15期8-13,共6页Power System Technology

摘　　要：以实测结果为参考,基于电磁暂态分析理论并通过数字仿真分析验证了合750kV空载变压器过程中产生持续时间短、振荡频率和幅值很高操作过电压的机理。通过仿真计算再现了750kV线路单相分合操作过电压很高的现象,比较了750kV线路操作过电压实测和仿真预测结果,确认出现该现象的原因是断路器合闸电阻未能正常投入。据此,建议及时消除断路器中可能存在的隐患,保证系统安全运行。Refering to measured results, on the basis of electromagnetic transient .analysis theory and by means of digital simulation the mechanism of the switching surge with short duration, high frequency and high amplitude during no-load switching of 750 kV transformer is verified. The simulation reproducts high switching surge during single phase opening-closing process of 750kV transmission line. The measured and simulated results of switching surge in 750kV transmission line are compared and it is validated that the reason causing the surge lies in failure preinsertion of the circuit breaker＇s closing resistor. For this reason, it is suggested that the possible hidden troubles in circuit breakers should be eliminated in time to ensure the secure operation of power grid.

关 键 词：750 KV输变电示范工程 操作过电压 合切空载变压器 避雷器 过电压及其防护 

分 类 号：TM864[电气工程—高电压与绝缘技术] TM723