有损大地对35 k V输电线路受雷击时雷电流的电磁场传递与耦合有着不可忽略的影响,通过选取合适的工程模型并结合时域有限差分(Finite-Difference Time-Domain,FDTD)算法对线路上的雷电感应过电压进行迭代求解。依据我国东、中和西部地...有损大地对35 k V输电线路受雷击时雷电流的电磁场传递与耦合有着不可忽略的影响,通过选取合适的工程模型并结合时域有限差分(Finite-Difference Time-Domain,FDTD)算法对线路上的雷电感应过电压进行迭代求解。依据我国东、中和西部地区不同土壤电阻率范围例取的3种大地电阻率情况下的杆塔接地电阻值和雷电感应过电压导入由电磁暂态仿真软件(Power Systems Computer Aided Design,PSCAD/EMTDC)搭建的线路模型,进行线路避雷器不同装配方案的仿真模拟。对比分析了不同避雷器安装密度时的雷击线路电压波形及耐雷水平,给出了更符合实际需求的35 k V输电线路避雷器装配方案。分析结果对我国不同地区35 k V输电线路的雷电防护设计及改造具有重要意义。展开更多
Based on the analysis of a specific relay model and an HVAC （high voltage alternating current） cable system, a detailed approach to EMTDC/PSCAD modelling of protective relays is presented. Such approach allows to cr...Based on the analysis of a specific relay model and an HVAC （high voltage alternating current） cable system, a detailed approach to EMTDC/PSCAD modelling of protective relays is presented. Such approach allows to create complex and accurate relay models derived from the original algorithms. Relay models can be applied with various systems, allowing to obtain the most optimal configuration of the protective relaying. The present paper describes modelling methodology on the basis of Siemens SIPROTEC 4 7SD522/610. Relay model was verified experimentally with its real equivalent by both EMTP-simulated and real world generated current signals connected to the relay.展开更多
文摘有损大地对35 k V输电线路受雷击时雷电流的电磁场传递与耦合有着不可忽略的影响,通过选取合适的工程模型并结合时域有限差分(Finite-Difference Time-Domain,FDTD)算法对线路上的雷电感应过电压进行迭代求解。依据我国东、中和西部地区不同土壤电阻率范围例取的3种大地电阻率情况下的杆塔接地电阻值和雷电感应过电压导入由电磁暂态仿真软件(Power Systems Computer Aided Design,PSCAD/EMTDC)搭建的线路模型,进行线路避雷器不同装配方案的仿真模拟。对比分析了不同避雷器安装密度时的雷击线路电压波形及耐雷水平,给出了更符合实际需求的35 k V输电线路避雷器装配方案。分析结果对我国不同地区35 k V输电线路的雷电防护设计及改造具有重要意义。
文摘Based on the analysis of a specific relay model and an HVAC （high voltage alternating current） cable system, a detailed approach to EMTDC/PSCAD modelling of protective relays is presented. Such approach allows to create complex and accurate relay models derived from the original algorithms. Relay models can be applied with various systems, allowing to obtain the most optimal configuration of the protective relaying. The present paper describes modelling methodology on the basis of Siemens SIPROTEC 4 7SD522/610. Relay model was verified experimentally with its real equivalent by both EMTP-simulated and real world generated current signals connected to the relay.
