What is voltage regulation in a synchronous generator?
The voltage regulation of an alternator or synchronous generator is defined as the rise in the terminal voltage when the load is decreased from full-load rated value to zero. The speed and field current of the alternator remain constant.
What is a voltage phasor diagram?
Phasor Diagrams are a graphical way of representing the magnitude and directional relationship between two or more alternating quantities. Sinusoidal waveforms of the same frequency can have a Phase Difference between themselves which represents the angular difference of the two sinusoidal waveforms.
What is excitation voltage in synchronous generator?
The excitation voltage of synchronous motor refers to the DC supply given to the rotor to produce the required magnetic flux. The excitation voltage (Ef) of a synchronous motor can be determined for different power factors using complex algebra. Let the supply voltage (V) be taken as the reference voltage.
What is equivalent circuit of synchronous generator?
The Equivalent Circuit of a Synchronous Generator The voltage EA is the internal generated voltage produced in one phase of a synchronous generator. If the machine is not connected to a load (no armature current flowing), the terminal voltage will be equivalent to the voltage induced at the stator coils.
What regulates voltage in a generator?
The stator winding of this alternator puts out an AC current/voltage to a voltage regulator. The voltage regulator turns that AC input into a DC output which is controlled so as to ultimately control the current into the main generator field.
What is the voltage regulation of this generator?
The Voltage Regulation of a Synchronous Generator is the rise in voltage at the terminals when the load is reduced from full load rated value to zero, speed and field current remaining constant.
How do you find the resultant current?
Find the resultant current and express it in the form i=Im sin(wt+0). If the supply frequency is 50Hz. A circuit consists of 3 parallel branches the branch current are given as i1= 10 sin (wt), i2=20 sin(wt+600) and i3=75 sin(wt -300). Find the resultant current and express it in the form i=Im sin(wt+0).
What is balanced voltage?
The voltage balance is the difference in magnitudes, in percent, of two output voltages that have equal nominal voltage magnitudes but opposite polarities. The voltage balance is usually used when referring to dual power supplies.
How is excitation voltage generated in a generator?
As the load on the generator is increased, an increase in current flow causes the voltage to drop. The excitation system senses this decrease in voltage and increases the strength of the magnetic field to return the voltage to the desired level.
What voltage is generally used for field excitation?
The most common values are 120, 3