Definition: The bus whose voltage and frequency remain constant even after the variation in the load is known as the infinite bus. The alternators operating in parallel in a power system are the example of the infinite bus. The on and off of any of the alternators will not affect the working of the power …
Construction of a Synchronous Machine, i.e. alternator or motor consists of two main parts, namely the stator and the rotor. The stator is the stationary part of the machine. It carries the armature winding in which the voltage is generated. The output of the machine is taken from the stator. The rotor is the rotating …
The Synchroscope is a device used for determining the phase angle differences between two or more machines at the time of the synchronization. The synchronization is essential for sharing the load on the bus bar of the power system. The following are the essentials conditions for synchronization: The magnitude of the incoming voltage becomes equal. …
The constant Flux Linkage concept is of considerable importance in studying alternator transients. This concept is stated as – The Flux Linkage after a sudden disturbance in a closed circuit having zero resistance and zero capacitance remain constant at their predisturbed values. There is no capacitance in the armature and the field windings of an …
The stator and the rotor are the two main parts of the synchronous motor. The stator is the stationary part of the motor and the rotor is their rotating part. The stator is excited by the three-phase supply, and the rotor is excited by the DC supply. The term excitation means the magnetic field induces …
Synchronous Condensor is also known as Synchronous Compensator or Synchronous Phase Modifier. A synchronous condenser or a synchronous compensator is a synchronous motor running without a mechanical load. It can generate or absorb reactive volt-ampere (VAr) by varying the excitation of its field winding. It can be made to take a leading current with over-excitation …
Zero Power Factor Characteristic (ZPFC) of a generator is a curve of the armature terminal voltage and the field current. The machine is operated with a constantly rated armature current at synchronous speed and zero lagging power factor. The Zero Power Factor Characteristic is also called as Potier Characteristic. For maintaining a very low power …
The Potier triangle determines the voltage regulation of the machines. This method depends on the separation of the leakage reactance of armature and their effects. The graph of the Potier triangle is shown in the figure below. The triangle formed by the vertices a, b, c has shown below in the figure is called Potier …
MMF Method is also known as Ampere Turn Method. The synchronous impedance method is based on the concept of replacing the effect of armature reaction with an imaginary reactance, the Magnetomotive force (MMF). The MMF method replaces the effect of armature leakage reactance with an equivalent additional armature reaction MMF so that this MMF may …
The word Excitation means the production of flux by passing current in the field winding. The arrangement or the system used for the excitation of the synchronous machine is known as Excitation System. To excite the field winding of the rotor of the synchronous machine, direct current is required. Direct current is supplied to the …
