Power Factor

Alternator( Generator?) does not have power factor. Power factor is for your load.

Just like the transformer ,generator nameplate the output rating is in kvar and the reactive loads are in kw why?The generator doesnt have a power factor.

A generator (alternator) power factor can be kept close to unity by manipulating the excitation of the alternator.

Try this, it explains it clearly. http://cliffordpower.com/wp/wp-content/uploads/2010/08/CPS_info_sheet_40_PF_relating-to-gensets1.pdf

i also get confuse most of the time regarding reasoning behind selection of power factor for alternator operation. I saw most of the TG are rated as 0.85 lagging power factor. I studied when we change power factor from leading to lagging, by keeping load current excitation and speed unchanged, terminal voltage decreases. It means when power factor is leading armature flux support main flux and we get more emf and in case of lagging power factor it is reverse.

So plz can any body explain me why we go for lagging pf operation why not leading pf operation as in the latter case we will get more emf? Is it anything to do with stability? If yes then plz explain how? What will be the effect of leading pf operation and lagging pf operation of TG lower than rated value?

have a look at this