The influence of rotor slot wedge conductivity on transient stability of turbine generator

In this paper, we establish Field-circuit-network Coupled Time-Step Finite Element Model by the combination of magnetic field equations, electrical circuit and network equations. Based on this mode, we take a 300 MW turbine generator as an example to study the influence of rotor slot wedge material on transient stability and establish the relationship between transient stability limit and rotor slot wedge conductivity. The result shows that the transient stability limit gradually increases as the conductivity of rotor slot wedge changes from σ_al (conductivity of aluminum alloy) to 0.05σ_al.