摘要
针对于水轮发电机定子绕组内部故障暂态电流的计算问题,采用场路耦合法对该问题进行了详细的分析。以SF600-42/1308水轮发电机为研究对象,在单机空载状态下,计算了突然发生单相、两相和三相短路故障的故障电流,并与经典的解析公式法进行了对比验证;在发电机带三相对称的阻性负载状态下,分析了发生匝间短路、同相支路间短路和相间短路故障的暂态过程。并研究了各故障电流随短路匝比的变化规律,分析得出故障发生的时刻和故障点的空间位置对各电流量数值具有较大的影响。并对3种类型的内部故障进行了比较,为水轮发电机组配置良好的主保护方案提供理论支持。
For the problem of hydro-generator stator winding internal faults transient current computational, the FEM coupled with electric circuit method, which effectively combined multi loop method and FEM analysis method, was adopted to analyze this problem detailed. SF600 -42/1308 large hydro-gen- erator was used as the object of study. In the no-load condition, sudden single-phase and two-phase and three-phase short circuit fault current were calculated, and the results was verified by classical analytic formula method;In the generator with three phase symmetric resistor load condition, turn to turn short-cir- cuit and branch to branch short-circuit and branch to branch short-circuit with different phase transient process were analyzed, and the laws governing the internal faults of the hydro-generator were investiga- ted. The result shows that the position of internal faults and the moment of internal faults occurring have great influence on the current after occurring internal faults. The different faults are also compared to find their influence on the internal faults of generator. It provides the theoretical support for good configuring main protection of hydro-generator.
出处
《电机与控制学报》
EI
CSCD
北大核心
2014年第3期40-45,53,共7页
Electric Machines and Control
基金
国家科技重大专项资助项目(2009ZX06004-013-04-01)
关键词
水轮发电机
内部故障
场路耦合法
暂态电流
hydro-generator
internal faults
FEM coupled with electric circuit
transient current
