摘要
通过中性点不接地系统中电磁式电压互感器在系统正常运行、单相接地、接地消失时全过程的仿真研究 ,分析了PT励磁涌流造成熔丝熔断的规律性以及各种因素对其的影响和开口三角绕组电压异常原因。同时 ,对系统运行参数变化后可能出现的铁磁谐振也进行了仿真分析。最后提出了电磁式PT使用中需注意的几点建议。
Through simulating some kinds of transient courses of PT when the ungrounded power system is being in normal service, single-phase grounded and post-fault, the regularity of magnetizing inrush current flowing through electromagnetic potential transformers in the isolated neutral system and factors which may affect the excitation current are discussed.The abnormal overvoltage of tertiary winding is also analyzed.Ferromagnetic resonances due to the iron core saturation of PT are simulated in the cases when system parameters are changed largely. Some protective measures such as insulation coordinatio n are suggested.
出处
《电工技术杂志》
2004年第6期67-70,85,共5页
Electrotechnical Journal
关键词
电磁式电压互感器
PT
励磁涌流
数字仿真分析
铁磁谐振
isolated neutral system electromagnetic potential transformer abnormity simulation study
