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alternating currents alternating-current angle armature armature reaction busbars capacitance circuit diagram coil component conductor connected constant copper losses core corona corresponding current and voltage current flowing current wave curves delta connection diagram in Fig dielectric direct currents direct-current effective values electric circuit energy equal equation equivalent exciting current field excitation field flux frequency full load harmonic hence hysteresis impressed voltage increase induction motor instantaneous values insulation iron kv-a leakage lines of force load current machine magnetic field magnetic flux magnitude meter neutral ohms operation pole power factor primary problem produced quadrature ratio reactive power rectifier represented resistance rotation rotor secondary short-circuit shown in Fig sine wave single-phase space stator synchronous condenser synchronous converter synchronous motor synchronous speed terminal voltage three-phase time-phase torque transformer transmission line two-phase vector diagram voltage and current voltage gradient voltage regulation voltage wave voltmeter volts wattmeter watts winding wire zero