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发电机的第一摆稳定性是准确评估系统最大传输功率的重要指标。对汽轮发电机本体而言，影响第一摆稳定性的因素主要有励磁系统，以及转子大齿导条、转子铁心和转子导电槽楔构成的阻尼系统。为了揭示上述因素与第一摆稳定极限的关系，该文以300 MW汽轮发电机为例，采用时步有限元模型研究了上述两种因素对发电机第一摆稳定极限的影响。结果表明：转子阻尼系统对发电机第一摆稳定极限的影响较大；由于转子导电槽楔通常由铝合金、不锈钢等材料构成，这些材料的电导率相差较大，因而进一步研究了转子槽楔电导率与第一摆稳定极限的关系，得出当电导率从σal(铝合金电导率)到0.05σal变化时，发电机的第一摆稳定极限逐渐增大。“,”The first swing stability (FSS) is an important factor to estimate the maximum transmission power of turbine generators. As for turbine generators, the factors affecting FSS mainly include the excitation system and the rotor damping system which contains damping bars, the rotor iron core and rotor conductive slot wedges. In order to reveal the relationship between these factors and FSS, we take a 300MW turbine generator as an example to build time step finite element model and to study the influence of two factors on FSS. The results show that the rotor damping system has a large effect on FSS; since we have several rotor slot wedge materials to choose from and the conductivities of these materials is different, we study the relationship between the FSS limit and conductivity of rotor slot wedges. It is concluded that the FSS limit gradually increases as the conductivity of rotor slot wedge changes fromσal (conductivity of aluminum alloy) to 0.05σal.