CAJ | 학술논문

由于大量大容量机组集中接入以及网架结构的不断加强，导致系统短路电流水平不断上升，750 kV凤凰片区短路电流已经超出断路器的遮断电流（50 kA），运行方式难以安排。随着后续机组不断接入，短路电流问题更加突出，短路电流超标已成为困扰电网安全稳定运行的关键问题。因此以750 kV凤凰片区短路电流现状为基础，结合规划网架结构，分阶段对凤凰片区短路电流水平进行计算，分析各工程对凤凰片区短路电流的影响大小。同时分别从调整运行方式、加装中性点小电抗、改变中性点接地方式等几方面对限制凤凰片区短路电流进行计算分析，并得出相应的结论，为凤凰片区运行方式安排以及后续的电网规划和电网建设项目可行性研究工作提供了重要的参考。
유우대량대용량궤조집중접입이급망가결구적불단가강，도치계통단로전류수평불단상승，750 kV봉황편구단로전류이경초출단로기적차단전류（50 kA），운행방식난이안배。수착후속궤조불단접입，단로전류문제경가돌출，단로전류초표이성위곤우전망안전은정운행적관건문제。인차이750 kV봉황편구단로전류현상위기출，결합규화망가결구，분계단대봉황편구단로전류수평진행계산，분석각공정대봉황편구단로전류적영향대소。동시분별종조정운행방식、가장중성점소전항、개변중성점접지방식등궤방면대한제봉황편구단로전류진행계산분석，병득출상응적결론，위봉황편구운행방식안배이급후속적전망규화화전망건설항목가행성연구공작제공료중요적삼고。
Due to the integration of a large number of large -capacity units and the continuous strengthening of grid structure which causes the continuous rising of short -circuit current , the short-circuit current in 750 kV Fenghuang area has excee-ded the breaking current of relay (50 kA), so the operating mode is difficult to arrange .With the integration of the following units, short-circuit current problem becomes more prominent , and the excessive short -circuit current has become a key problem influencing the safe and stable operation of power grid .So based on the actual situation of short -circuit current in 750 kV Fenghuang area and combined with the grid structure planning , the level of short -circuit current in Fenghuang area is calculated in stages , and the effects of each project on the short -circuit current in Fenghuang area are analyzed .At the same time, as viewed from adjusting operating mode , installing small reactor on neutral point and changing neutral grounding mode , the restrictions on short-circuit current in Fenghuang area are analyzed and calculated , and the corresponding conclusions are obtained, which provides an important reference for the arrangement of operating modes and the following feasibility research of grid plan and grid construction in Fenghuang area .