Working of self - excited generators, Electrical Engineering

Assignment Help:

Q. Working of self - excited generators?

For self-excited generators, residual magnetism must be present in the ferromagnetic circuit of the machine in order to start the self-excitation process. For a dc generator, the relationship between steady-state generated emf Ea and the terminal voltage Vt is given by

where Ia is the armature current output, and Ra is the armature circuit resistance. For a dc motor, the relationship is given by


Vt = Ea + Ia Ra

where Ia is now the armature current input. Under steady-state conditions, volt-ampere characteristic curves are of interest for dc generators, and speed-torque characteristics are of interest for dc motors. Depending on the method of excitation of the field windings, a wide variety of operating characteristics can be obtained. These possibilities make the dc machine both versatile and adaptable for control.

974_Working of self - excited generators.png


Related Discussions:- Working of self - excited generators

Integrator circuit, Q. Addition and integration can be combined by the summ...

Q. Addition and integration can be combined by the summing integrator circuit shown in Figure. With the given component values and input waveforms, sketch v o when S is opened at

Illustrate procedure of hex to binary conversion, Q. Illustrate procedure o...

Q. Illustrate procedure of Hex to Binary Conversion? It is also simple to convert from an integer hex number to binary. This is achieved by: Convert the Hex number t

Explain state-variable techniques, Q. Explain state-variable techniques? ...

Q. Explain state-variable techniques? The matrix formulations associated with state-variable techniques have largely replaced the block-diagram formulations. Computer software

Obtain the node voltages and current through each element, Q. For the circu...

Q. For the circuit shown in Figure, develop and execute a PSpice program to obtain the node voltages and the current through each element.

Write a control word for counter 1 of 8253 / 8254, Write a control word for...

Write a control word for counter 1 of 8253 / 8254 that selects the following options:  load least significant byte only, mode 5 of operation and binary counting.  Then write an ins

Transformers., Calculations of sending line voltage

Calculations of sending line voltage

Evaluate the directions of conventional currents, Q. For a p-channel JFET i...

Q. For a p-channel JFET in its active region, specify the polarities of voltages and the directions of conventional currents.

Compute number of electrons and find their average velocity, Q. A wire with...

Q. A wire with n = 10 30 electrons/m 3 has an area of cross section A = 1mm 2 and carries a current i = 50 mA. Compute the number of electrons that pass a given point in 1 s, an

Applications of holography, Applications of holography 1.       Hologra...

Applications of holography 1.       Holography is used in the non-destructive tests by interferometic methods. In this method called double exposure holographic interferometry,

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd