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Rotor field winding pass into the DC current generated close to sinusoidal magnetic field (called the rotor magnetic field), the effective magnetic field flux intersecting with the stationary armature winding chain. When the rotor rotates along with rotor field rotate together, each revolution, each phase winding of the stator magnetic field lines cutting order in the three-phase stator windings of the three-phase AC induction potential. Generator with symmetrical load operation, the three-phase armature current synthesizer generates a rotating magnetic field synchronous speed. The stator and rotor magnetic field interaction, will produce braking torque. Mechanical torque input from the turbine to overcome the braking torque for power. Generator may issue the active and reactive power. So, we have to adjust the active power regulator into the steam turbine. Rotor magnetic field strength directly affect the voltage stator windings, so the tone generator terminal voltage or tone generator reactive power is necessary to adjust the rotor current.

Active and reactive power of the generator and called geometric sum of apparent power. Active power and apparent power ratio called the generator power factor (power factor), rated power factor of the generator is generally 0.85

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