Electrical Engineering is a cross-disciplinary course that solicits students to learn numerous concepts. One paramount concept that every electrical engineer should know is of synchronous and asynchronous generators and motors. Electrical Engineering experts at My assignment Services provide expert tutoring service along with providing the synchronous generator assignment help through guided sessions. Be it questions related to differential protection of a synchronous generator or any other topic like synchronous generator numerical or synchronous generator model, our experts are qualified to solve your Synchronous generator assignments for you.
Our Electrical Engineering assignment help through guided sessions is the secret recipe to HD and stellar grades. However, if you are here to find some references and knowledge about the subject, keep reading further to find the numerous concepts of Synchronous Generator like Brushless Synchronous Generator, Differential Protection of a Synchronous generator or Synchronous Machine formula.
The synchronous generator that is also known as an alternator is an electrical instrument that, at a specific voltage and frequency, transforms the mechanical power from a prime moving shaft to an AC electrical output. The synchronous motor also operates at a steady pace called synchronous velocity.
All Synchronous Generators and motors work on the concept of magnetism that is derived from the Faraday’s laws of electromagnetism and induction. The synchronous generator works on the principle of Faraday laws of electromagnetic induction. According to Faraday’s law of electromagnetic induction, the electromotive force that is induced in the armature coil due to a change in flux in the armature due to a sinusoidal waveform of the AC current causes the rotatory movement in the AC synchronous motor. This principle is reversed in the case of synchronous AC generators as the rotatory movement of armature induces a change in EMF around the conductor coil that eventually causes the flow of electric current in the coil and generates steady AC current.
In simplified terms, it can also be considered that if external forces on the shaft of the alternator, induces a relative motion between the static magnets or static magnetic field and the armature, then the relative flux would change around the coil of the conductor which would generate an electromagnetic potential and eventually electricity in a synchronous fashion. The output waveform would be functions of SIn or Cosin, ie, reciprocating between absolute and vector values of constant amplitude.
If the above coil turns clockwise by an angle of 90 degrees, against the axis a-b, then the sides of the conductor would be in the opposite orientation than before and facing the opposite poles. Thus, we could say that the coil covered a significant distance while being perpendicular to the existing magnetic flux between the two poles from north to south. This tangential motion induces an electric current in the coil.
Now considering the construction of an industrial synchronous generator, then the relative motion occurs as the magnetic field rotates between the stationary armature conductors. The synchronous generator’s shaft is coupled with the turbine blades to rotate at synchronous speeds. Thus, the moving magnetic flux perpendicularly cuts the relative motion of the shaft producing a continuous wave of current.
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Differential protection for a turbine is used mainly to protect the engine stator windings from ground failures and phase-to-phase faults. The faults in the stator windings can be very harmful, and the generator itself can procure considerable harm. The differential protection scheme for a synchronous generator is used for the safety of the generator's stator winding and also to clear the fault in order to quickly mitigate the severity of any damage.
The security system involves the construction of two similar transformers on both ends of the protection field. The existing transformers' secondary terminals are connected in stars, and their end terminals are linked through the pilot cable. Then, the relay coils are connected in delta formation. The neutral is directly connected to the common terminal. Additionally, the relay is also connected across the other equipotential points of the three pilot cables in order to equally distribute the burden between the system.
Additionally, or proper working of the differential system, it is crucial to locate and safeguard all of the relay coils that are adjacent to the current transformer in the main circuit.
Both the shaft and the stator can be seen as the rotating or the stationary part of the synchronous generator. They are one of the power generating elements of any synchronous generators. While the stator carries the armature, the rotor bears the field pole. It is the relative motion between both of them that induces a potential difference between the two ends of the generator.
The industrial standard is the 3 phase synchronous alternators have numerous advantages in generation and transmission of electricity. The large units are used in places like nuclear, hydropower and thermal power systems for generating electricity. Applications of smaller generators like the ones with ratings in the range of 100MVA are used in the power generating station. They are used in the super thermal stations where the synchronous generators make a significant portion of electrical power.
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