Electrical Engineering Articles


Effect of Harmonic Components on EMF of Synchronous Generator

Before knowing Effect of Harmonic Components on EMF let us know what are harmonics and harmonic components in alternators.In synchronous machines, voltages and currents are induced, which are in sinusoidal waveforms.But in practice, these sinusoidal waveforms will deviate to form non-sinusoidal waveforms. These non-sinusoidal waveforms are expressed in terms of Fourier transforms which are the sum of series of sinusoidal waveforms.Now let us understand the effect of harmonic components on the synchronous generator. The flux density distribution around the air gap in all well-designed alternators symmetrical with respect to the abscissa and also to polar axes.Thus it can be…

Parallel Operation Of Two Alternators or Synchronous Generators

 It has already been seen that in the case of interconnected systems at the power stations the parallel operation of two alternators.In fact, the electricity demand of a country is fed by many alternators operating in parallel. There are various advantages of Parallel Operation Of Two Alternators or Synchronous Generators.Some of them are listed below. (i)For a given capacity of a generating station, either a single large unit or many small units may be installed.If there are many small units operating in parallel instead of the single large unit then a…