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excuse me but i ask you what is the relation between the fact that we keep v/f and hence flux constant and we do a speed control , what if we dont keep it constant? cant we control the speed ? also pls tell me what about the relation between torque and the airgap flux? it is so difficult to...

hi chaps. i want to ask you about the role of the air-gap flux in the motors with regard to v/f control, everywhere it is written that v/f is kept constant to keep the magnetizing current constant, but why??? what is the relation between flux and torque? I also wonder the air-gap flux and...

cheers:) thank you mr wolf39 it is kind of you to write all these here...

no no this is a diesel generator only i mean the shatf of the diesel motor which drives the alternator ok?

thank you my friends i am sure that you all are good engineers but what i ask is not a theory but a simple question, just tell me pls if i have a 1000 kVA diesel-generator on the nameplate of which writes cos phi = 0,8 THE MOTOR SHAFT which drive the alternator is meant to have a 800 KW output ?..

hello, where do we need to connect the current transformer on pfc installations which gives the current knowledge to the reactive power relay ,in fornt of the power transformers or to the load side of it? ? am asking it because i cant guess the role of the reactvie power due to the magnetization...

what i wanna learn is a point of contest between davidbeach and hoxton i think.. So does a 1000 KVA generator is capable of giving 900 or 950 or 1000 whatever (more than 800 kva) KVA out of its terminals electrically if this generator is rated 1000 KVA and cos phi = 0,8 on its plate?

hi, i wonder if we have plate cos phi value of 0,8 does it mean that a 1000 kVA generator will give nominally 800 kwatt? is there any drawback if we operate this generator with a load of 1000 kwatt? ?f we could do it, so why do we have cos phi = 0,8 values on generators ups's etc...greetings..

i think there is no one who deals with hydroelectrics..

what is the difference between pedestal and thrust bearing? both of them supports the turbine in vertical plane? they are enduring the weight ?

i wonder the functions of them in a hydroelectrical power central

pls tell me about these parts on turbine and generator 1- pedestal bearing 2-guide bearing 3- thrust bearing

could you tell me pls if I use one phase of a three phase transformer and the other two is no loaded and wye point is earthed well what is the voltage levels of the phases in general, or does it has drawbacks on the transformer?

but i want someone to explain the relation between dielectric constant and insulation level,is there?

as far as ? know the vacuum is a better dielectric than air but when we look at the material properties chart of them we see that dielectric constant is higher for air. so am i wrong when i think that vacuum is the best dielectric of all materials but as coefficient it has 1 and air is 1,006...

dry types work in higher temperatures than oil type_?

pls tell me if for example i have 200 house each has a 10 kwatt consumer if all the receptacles and lightings. so i will calculate a transformer rating for this premise site.what is the correct approach here .SHALL I apply a diversity for calculating transformer kva or not.... As far as I...

so pls tell me why dry types are louder tha oil types greetings friend

pls tell me if there is a difference between dry and oil type transformers in sight of transformer humming and is it true that as the load increases the humming decreases and if dry type is worse than oil type with regard to this point. Also i wonder if there is a relation between harmonics...

in here we call this PFC system as compensation what do you call it?