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)

should Dy11 and Dy1 group can be operated in parallel??????

1 Answers  

I am getting above 60 V as open delta voltage against single phase unit ICT at tertiary delta formed and ICT getting trippped on NDR. ICT tested and found in order. PTs provided on tertiary are tested and in order. what may be the reason?

0 Answers  

why the impedence of the transformer is expressed in percentage?

3 Answers   DEWA,

22kV HT incoming should be 3 phase or 4 phase? why is it not 4 phase?

1 Answers  

working principle a.v.r. ?

0 Answers   Gem Sugars,

working function importance of mdc meter

0 Answers  

Natural frequency in the control system represents nature of a. Transient response b. Oscillations c. Overshoot d. Speed of responce

1 Answers  

How star and delta connections inherently eliminate triplend harmonics?

1 Answers   Blue Star,

Generally In transformer Tap Changer on HT side, but I have seen in 66KV side in 220/66 KV, 100 MVA, Areva make transformer. Why ?

7 Answers  

1.stranded resistance values of motors? 2.how to calculate the resistance values of single phase and 3phase motors?

2 Answers   Bell, L&T,

how will you determine the short circuit capacity of a network

3 Answers   Dalkia,

The rotor current is directly proportional to slip. How?

3 Answers