摘要
为解决智能电网运行中因采样数据异常及变压器励磁涌流不能正确识别导致的变压器保护动作可靠性不高的问题,提出一种变压器保护采样可靠性及涌流识别的研究方案。对于采样数据异常问题,提出一种利用两路AD采样数据实时相互校验并共同把关保护逻辑出口的方案。同时针对涌流识别问题,提出一种差流谐波互闭锁+空投时按相综合谐波开放及恢复性涌流时按相差流二次谐波低"三取二"的方案。通过实验仿真,验证了涌流识别方案的有效性。
To solve the problem that the reliability of transformer protection tripping is not high because abnormal sampling data and excitation inrush current cannot be identified properly in smart grid, this paper puts forward a research scheme about sampling data reliability and inrush current identification of transformer protection. For the problem of abnormal sampling data, it gives a method which uses double AD sampling data to real-timely check each other and control protection logic outlet together. At the same time, for excitation inrush current identification problems, it proposes a method of differential current harmonics mutually atresia plus synthesis harmonic open by phase on no-load energizing and secondary harmonic low ＂two out of three＂ by phase differential current when restorative excitation inrush current happened. Simulation results verify the effectiveness of inrush current identification scheme.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2016年第14期166-170,共5页
Power System Protection and Control
关键词
变压器
智能电网
恢复性涌流
三取二
励磁涌流
双AD
transformer
smart grid
restorative flow
two out of three
inrush current
double AD
