The brushless excitation system works in the absence of commutator, slip rings and brushes. Instead of these components we are using Permanent Magnet Exciter and three phase main Exciter with silicon diode rectifier the system has generated. With this system we can avoid dust particles which cause a great maintenance cost. The complete structure of this excitation system is explained clearly in this review. Drawback of this system is presence of considerable exciter time constant which affects the rate of change of voltage.
6 Claims, 2 Drawing Figures ROTATING l COMPONENTS GENERATOR FIELD A.C. REGULATOR GENERATOR ARMATURE l GENERATOR EXCITATION SYSTEM WITH ROTATING ELECTROMAGNETIC ENERGY CONNECTOR AND INTERNAL WINDING POWER SOURCE BACKGROUND OF THE INVENTION This invention relates generally to static excitation systems for large dynamoelectric machines, and more particularly to self-excited dynamoelectric machines with a compounded excitation power source for the field windings.
HOW IS AC VOLTAGE PRODUCED?
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Characteristic of Separately Excited DC Generator
Internal or Total Characteristic of Separately Excited DC Generator
The internal characteristic of the separately excited DC generator is obtained by subtracting the drops due to armature reaction from no load voltage. This curve of actually generated voltage (Eg) will be slightly dropping. Here, AC line in the diagram indicating the actually generated voltage (Eg) with respect to load current. This curve is also called total characteristic of separately excited DC generator.
Stand Alone Phasor Diagrams
In the case of stand-alone operation, it can easily be shown that if Exciation is not adjusted, the terminal votlage of a generator is a function of the magnitude of the load and the phase angle of the load. Increased inductive reactive power demand reduces the terminal voltage, while increased capacative reacrive power can actually result in an higher terminal votlage, under some circumstances.
How can I draw the curve of characteristic of a separately excited generator?
The curve which gives the relation between field current (If) and the generated voltage (E0) in the armature on no load is called magnetic or open circuit characteristic of a DC generator. The plot of this curve is practically same for all types of generators, whether they are separately excited or self-excited. This curve is also known as no load saturation characteristic curve of DC generator.
What is a separately excited DC generator?
The external characteristic of a separately excited generator is the curve between the terminal voltage (V) and the load current IL (which is the same as armature current in this case). In order to determine the external characteristic, the circuit set up is as shown in Fig (i). As the load current increases, the terminal voltage falls due to two reasons:
Rotating equipment is so common, yet so misunderstood, that even highly experienced electricians and engineers are often plagued with questions about their operation. This article will answer seven of the most commonly asked questions. The explanations are brief and practical due to space limitations; however, they will enable you to have a better understanding of this equipment.