Running PF Calculation

Quote "I have a 200KVA gen, a pf of 0.8 to have a true rated power out put of 160W max. if i load the generator to get a true power output of 80W, will i be correct by saying that the load pf is 80/200 = 0.4 and how does this affect the supply and the load?"

Your generator is rated at 200 KVA if the PF = 0.80. If the PF of the load was 1.0 the generator would be capable of 200 KVA = 200 KW. KVA = KW/pf. Eg 80 kw at 0.80 PF would equal 80 kw/0.80 = 100 KVA. The load determines the Pf, not the generator.

200kVA is the generator's capacity.

at 0.8 p.f:

kVA = kW x P.f
200 = 160 x 0.8

Whatever load there is on the generator, it should change the current value (whereas the system voltage remains the same). Power factor is usually set at a fixed value i.e. 0.8 or depending upon if there is requirement for reactive energy that has to be exported.

"Load determines the supply".

Please recheck your equations.

kW = kVA x pf. Not the other way.

Also, the load decides the pf. If i have a high-inductance load like an induction furnace with pf ≈ 0.3, how can the generator keep supplying at 0.8 ?

Depending upon the load pf.

you can adjust the generator p.f accordingly and run on any p.f with in the generator capability curve limit

having said that about my question, i would rephrase by asking if power factor is constant through the process of generating and loading. i knw voltage is constant. current varies (depending on the load) but how about the pf, is it constant irespective of the load?

you can run the generator on the fixed power factor mode if you want.

but with this you cannot control the voltage level at the switchgear.

voltage level will change. it will decrease if load is more reactive and it will increase if load is less reactive.

as mentioned in the discussion...the load affects the pf..your effective VA is still the same..but your VAR varies...try looking at the impeadance triangle..you will find the answer there.

________________________________________

take care of your seconds and the minute will take care of itself...-LRN

19ΕΣ57