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Anonymous Poster

power factor

08/08/2007 2:53 AM

Sir, we are having DG set of 250 KVA, 415V if we put capacitor banks at load side , Diffrent types of load like Welding machine, motors , lightning load, say when generator is running at full load, when some load is cut of suddenly that is low load say 90% to 30% load , what will be the effect on the generator?

What will be power factor of the Diesel generator set at no Load ? as given on the name plate or ?

If there is constant load it is ok ,for variable load what will be the effect on the generator when we switch off some load suddenly with using capacitor bank?

Pl explain me detail

Thanking you
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ramvinod
Guru

Join Date: Jun 2007
Location: chennai,India
Posts: 592
Good Answers: 19
#1

Re: power factor

08/08/2007 4:32 AM

The power factor is cosine angle of current vector with referance to the voltage vector.

Therefore when there is no load on the generator,there is no current flowing from the generator,therefore there is no power factor when there is no load.

The power factor will vary depending on the load.

Even if the DG is loaded with constant load, the true power on the DG should not be greater than rated capacity of DG set.

For example 250 kVA DG sets are generally rated as 250 kVA @ 0.8 pf ,415 volts which means that Generator can deliver 350 Amps as full load and true power would be 200 kW

The maximum current it can deliver is only 350 amps.and maximum True power it can deliver is only 200 kW

The power factor can be upto 1.but the total power should not exceed 200 kW.What I am trying to emphasis is you can not load the Generator 350 Amps and PF of 1,in this instance the the total load is woking out to 25o kW,which the DG can not deliver.

__________________
 Ramesh,Freelance Electrical/automation Consultant
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