摘要
现有大容量发电机断路器(generator circuit breaker,GCB)采用SF6气体灭弧,存在不环保、开断速度慢、长期被国外技术垄断等问题。为从系统层面厘清大容量同步发电机源故障电流特点及其对GCB的开断需求,该文研究了大容量发电机源故障电流特有的延时过零机理,发现阻尼绕组与定子绕组间的强磁耦合作用是导致故障电流延时过零的根本原因,而非传统认知的高电抗/电阻比值(X/R);揭示了阻尼绕组材料、故障相位角、励磁状态、转速等对故障电流幅值和延时过零等特性的影响规律。以实际工程应用的1200MW核电机组为例,构建了其有限元仿真模型,对相关研究结论进行了仿真验证,总结归纳出环保型大容量GCB的特殊开断需求。研究结论可为研发环保型大容量快速GCB提供指导和依据。
The existing high-capacity generator circuit breaker(GCB)relies on SF6 arc extinguishing technology,which is not environmentally friendly,has slow breaking speed,and has been monopolized by foreign companies.To clarify the requirements of large-capacity GCB at the system level and guide the development of environmentally friendly GCB,this paper studies the mechanism of delayed current zero appearing in the fault current fed by the large synchronous generator.It is found that the strong magnetic coupling effect between damping winding and stator winding is the main cause of delayed current zero,rather than the traditional thinking of high reactance to resistance ratio(X/R);The influence of damping winding material,fault phase angle,excitation state and speed on the amplitude and delayed current zero of the fault current is revealed.Taking a 1200MW practical nuclear power unit as an example,a simulation model based on the finite element method is constructed to verify relevant findings.The special requirements of large-capacity GCB are summarized.The research conclusions can guide and guide developing environmentally friendly large-capacity GCB.
作者
温伟杰
范晶涵
靳鹤志
王晓远
李斌
WEN Weijie;FAN Jinghan;JIN Hezhi;WANG Xiaoyuan;LI Bin(Key Laboratory of Smart Grid of Ministry of Education(Tianjin University),Nankai District,Tianjin 300072,China;National Industry-education Platform of Energy Storage(Tianjin University),Nankai District,Tianjin 300072,China;State Grid Jibei Electric Power Co.,Ltd.,Langfang Power Supply Company,Langfang 065001,Hebei Province,China)
出处
《电网技术》
北大核心
2026年第1期221-230,I0106-I0112,共17页
Power System Technology
基金
国家重点研发计划项目(2022YFB2403601)。
关键词
故障电流
延时过零
发电机断路器
直流阻尼
fault current
delayed current zero
generator circuit breaker
damping of direct current
