Cooling of a Synchronous Generator

Cooling of a Synchronous Generator is very essential. Natural cooling is not adequate to dissipate the great amount of heat produced in the alternators. In the forced air cooling system, air is forced into the alternator so that a greater quantity of air is passed over the surface and a large amount of heat is…

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Winding Factor

Winding Factor is defined as the product of Distribution factor (Kd) and the coil span factor (Kc). It is denoted by Kw. The distribution Factor and the coil span factor has been already discussed earlier. The EMF equation is given below. It is assumed that the induced voltage is sinusoidal. However, if the flux density…

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Hydrogen Cooling of a Synchronous Generator

Hydrogen Cooling or you can say hydrogen gas is used as a cooling medium in the generator casing because of its superior cooling properties. Certain mixtures of hydrogen and air are explosive. The explosion may take place with a range of 6 percent hydrogen and 94 percent air up to 71 percent hydrogen and 29…

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Parallel Operation of the Alternators

Interconnection of the electric power systems is essential from the economical point of view and also for reliable and Parallel Operation. Interconnection of AC power systems requires synchronous generators to operate in parallel with each other. In generating stations, two or more generators are connected in parallel. The alternators are located at different locations forming…

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Synchronous Impedance Method

The Synchronous Impedance Method is based on the concept of replacing the effect of armature reaction by an imaginary reactance. For a synchronous generator following are the equation given below Where, For calculating the synchronous impedance, Zs is measured and then the value of Ea is calculated. From the values of Ea and V, the…

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Infinite Bus

A system having a constant voltage and constant frequency regardless of the load is called an Infinite Busbar system. Thus, an infinite bus has a large power system. The amount of real and reactive power is drawn or supplied, does not affect its voltage and frequency. They both remain constant. In a power system, normally…

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Construction of a Synchronous Machine

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…

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Synchroscope Synchronizing

Synchroscope compares the voltage from one phase of the incoming machine with the phase of the three phase system. The phase sequence of the generator is usually checked carefully at the time of its installation. This is checked with the help of Synchroscope. The figure is shown below. The position of a pointer of the…

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Flux Linkage Equation

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…

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Working Principle of a Synchronous Motor

The working principle of a Synchronous Motor is explained in this article.When a 3 phase supply is given to the stator of a 3 phase wound synchronous motor, a rotating field is set up in an anticlockwise direction which rotates at a synchronous speed NS = 120f/P. This is represented by the imaginary stator poles.…

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