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大型水轮发电机在突然短路故障下,巨大的冲击电流将在铜环间产生强大的冲击电磁力,给端部铜环的固定结构造成威胁。针对这一实际工程问题,以一台1000MW水轮发电机为研究对象,从其电磁力产生的原理出发,首先对仿真得到了故障电流大小,接着运用电磁场有限元方法,求解了汇流铜环在故障电流激励下端部磁场中承受的电磁力。计算考虑了三相、两相突然短路,并在圆周上求取了多个截面,计算结果为电机结构设计提出了定量的要求,具有实际工程应用价值和参考意义。
In the event of a sudden short-circuit fault in a large hydroelectric generator, a large inrush current will generate a strong impact electromagnetic force between the copper rings, posing a threat to the fixed structure of the end copper ring. Aiming at this practical engineering problem, taking a 1000MW turbine generator as the research object, starting from the principle of electromagnetic force generation, the fault current was simulated firstly, and then the electromagnetic field finite element method was used to solve the problem of confluence copper ring Fault current excitation under the end of the magnetic field in the electromagnetic force. The calculation takes the three phases and the two phases into a sudden short circuit and obtains several cross sections on the circumference. The calculation results put forward the quantitative requirements for the motor structure design, which has the practical engineering application value and reference significance.