Answer / ranjeet

transformers are rated in kva because copper loss is due to current and iron loss is due to voltage so it is expressed in va and power factor is not know

Answer / jayesh pillai

the load on generator or transformer is not known so its
power factor is also unknown
moreover active losses occuring in transformer is very low

due to these reasons generator or transformer are having
rating in kva and motor is in kw

Answer / k.sri405

generator is a power source so the load of generator is not
known it may either inductive or resistive or capacitive.
and power factor depends on load so it is rated in kva. but
motor itself is a load so it is rated in kw.

Answer / vamsi

trf having two losses 1.copper losses depends on current and iron losses depends on voltage.so trf having unknow power factor.it depends on nature of the load i.e restive,inductive and capacitive load bt motor having fixed power factor and its doesnt depends on load.

Answer / sumit kumar

In the case of t/f eddy current loss and hysterisis loss due to current so, the rating of t/f is in kva but in case of motor loss is i^2*r so,rating in kw.

Answer / qwde

Aternator's & Xmer's power factor depend on threir loads.
So that u can not calculate KW rating at the time of
manufacturing.

Answer / shareef

The simple answers are
1- Motor & Loads devices specify by KW
2- Generator, transformer, OHTL, UGC...ect (any devices
used to transfer, improve or generate the power is
specified by KVA)

what is 30-phase of transformer

0 Answers  

Difference between ups

32 Answers   Emerson, Tata Power,

how we start 40w tube light with 4 diodes,2capacitors,1 choke and without starter.(a product avilable in market which lights burnt tube lights also)

0 Answers  

WHAT KIND OF LIGHTENING PROTECTION SCHEMS CAN BE ADOPTED FOR THE FLAT ROOF OF BIG DIMENSION.

0 Answers  

why earth hole size is biggest in socket point.

5 Answers  

what is the reason for earthing static equipments? why?

3 Answers  

What is meant by impedance? difference between high & low impedance ?

0 Answers  

How could I get a certificate of competency as Electrical Supervisor? I have completed By BTech in Electrical this year(2012) for VJTI Mumbai Maharashtra. Is it compulsory to be produced while joining?

0 Answers   ONGC,

we have one pumping station and 4.6 MW 7 no.s synchronous motors.so there is no required HT capacitor to improve power factor.But we have two no.s of 25 Mva power transformer connect to distribute the power for motors connect with 220 kv line.So i have required the HT capacitor to improve power factor at HT side i mean power transformer bus side.So please suggest how much HT capacitor banks required for same.

1 Answers  

How much inductance or resistance require as a starter in series with induction motor of specific capacity(e.g. 5 hp) ? What is formula for it ?

0 Answers   Reliance,

What is Working principle of electronic choke?

1 Answers  

What is transformer saturation?

1 Answers