The maximum power that can be transferred is sinusoidal with respect to power angle. For two different circuit configurations, the maximum power transfer as a function of power angle might appear as curves I and II in Figure 2.3. The difference might be a higher reactance between the generator and the infinite bus (e.g., switching out of a line) in curve II. FIGURE 2.3 TRANSMITTED POWER AS A FUNCTION OF THE GENERATOR POWER ANGLE In condition I, the equilibrium value of 6 is When the line is switched out, the generator rotor begins to accelerate because the power transmitted is less than the mechanical power to the rotor. The rate of change of the rotor angle is given by
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