基于EMTP的高压输电工程电磁暂态研究

重点关注了同塔双回架设线路的感应电压及感应电流问题，采用电磁暂态仿真程序ATP-EMTP，建立了某500 kV电厂接入系统工程的系统元件模型，仿真计算了建成投产后电厂—城西站双回500 kV线路三相电压、电流的不平衡度以及线路感应电压、和感应电流的情况。根据仿真计算结果可知，在本工程推荐的线路相序及换位条件下，线路三相电压、电流的不平衡度均满足国标要求；线路侧接地刀闸感应电压在该研究结果的基础上提高5%，感应电流可参考本次研究结果。

Research on Electromagnetic Transient of HV Power Transmission Project Based on EMTP

This paper focuses on the induced voltage and induced current of the double circuit lines on the same tower. The system component model of 500 kV Power plant access system engineering is built by use of electromagnetic transient program (EMTP). The three-phase voltage unbalance, three-phase current unbalance, inductive voltage, and inductive current of the double circuit line in the same tower from Power Plant to ChengXi substation are calculated by this model. The results show that the three-phase voltage unbalance and three-phase current unbalance can meet the requirements of the national standard based on the current phase sequence and transposition condition which is recommended in this project. When selecting the grounding switch, the inductive voltage should up 5% on the basis of the results in the study, and the inductive current could refer to the results in this study.