Interested to Buy Any Domain ? << Click Here >> for more details...
How does frequency affect KVA rating of a transformer?
If a 500 kva, 400 v, 60 hz t/f is to be operated on 50 hz
frequency then how will its KVA rating change?
a-increase
b-decrease
c-remains same
Also explain why do u think like that.
- 8 Answers
- 33446 Views
- I also Faced
- E-Mail Answers
Answer Posted / nikhil singh
Transformers are rated in kva and not in KW for taking into
account the core and copper losses which are dependent on
voltage and current respectively without involving power
factor.Now the copper loss is independent of frequency but
the core loss comprising of hysterisis and eddy current
loss is proportional to frequency.So as frequency decreases
core loss decreases and KVA rating decreases.
| Is This Answer Correct ? | 15 Yes | 16 No |
Post New Answer View All Answers
A 230V dc shunt wound motor has an armature resistance of 0,15Ω.When operating on no load at 650 rev/min the armature current is 6A . The motor takes a full load current of 85A. Calculate the full load speed if the field flux is (i) maintained constant (ii)reduced by 0,03
how to erect roof control panel?
if in 3-phase system voltage=440V,frequency=60Hz, current=400A. then if it is single phase then current=? and if it is single phasing then current=?
Main advantage of auto transformer over two windings transformer is that A it needs no cooling B it uses only one winding C core losses are reduced D it has simple construction
what is meant by k-rating in isolation transformer?what is k9, k14 stands for?
What is a diode?
Is any AC drive(VFD) had a feature of DC injection braking? if available please mention the detail. i.e drive can supply braking torque when the motor in idle state.
what is difference between isolation and ultra isolation transformer?, what is the method of testing ?
Why do we require transformer with less specific weight if supply frequency is increased?
In our plant we have installed new MCC with ELR and CBCT which is detecting some leakage current in the system but it leading to some confusion when to check that in which feeder which is drawing current we put off the whole panel itself but still CBCT detecting some leakage current so can anybody ans me , where i am going wrong or how to detect whether its actual leakage or CBCT malfunctioning.
i want wipro vlsi placement pattern please send me
When calculating the speed of a rotor required for a particular frequency of synchronous generator we use the equation 60f/p Is this p is the number of pole pairs of rotor & do we consider the number of pole pairs in the stator is 1?
1 Ton is equal to how many watts?
how can maintaince the acb contactor moveing and fixing kit
we all know voltage is a force(emf), and the force always devides if 2 or more than2 loads are there but why does the voltage remains same is parallel, it must devide na ???
