Can a 50-Hz designed transformer be used at 60-Hz system?
Is the same remains true, when a 60-Hz designed transformer
be used at 50-Hz system? Consider only frequency variation.
The voltage remains as rated value in all cases.
Justify the answer.
- 2 Answers
- 7057 Views
- I also Faced
- E-Mail Answers
Answer Posted / brajeshjhaa
For a transformer the voltage is proportional to the product of flux and frequency.
case-I
Voltage = constant
Frequency = increased from 50 to 60Hz i.e. change by 120%
For Transformer:
Voltage = flux * frequency * K; k is a constant
so when frequency increases by 120% flux decreases to 83.3% Now;
Hysteresis loss = flux^2 * frequency^2 * T; T is constant
At 50 Hz
Hy. Loss@50 = flux^2 * Frequency^2 * T
At 60 Hz
Hy. Loss@60 = (.833flux)^2 * (1.2Frequency)^2 * T
On evaluation:
Hysteresis loss@50Hz = Hysteresis loss@50Hz
Eddy Current Loss
Eddy C. L. = flux^1.6 * f * C; C is a constant
Eddy@50 HZ = flux^1.6 * f * C
Eddy@60 Hz = (.833flux)^1.6 * 1.2F * C
On evaluation;
Eddy@60Hz = 0.895 * Eddy@50HZ
So it is seen that a 50HZ transformer when operated at at 60Hz has same hysteresis loss eddy current decreases. As the core loss decreases the transformer can be safely operated.
But if a 60Hz transformer is operated at 50Hz, then just the reverse of above the core loss i.e. eddy current loss will increase and hence the core loss will go high; hence not advisable to operate.
| Is This Answer Correct ? | 0 Yes | 0 No |
Post New Answer View All Answers
IF % IMPEDANCE OF A TRANSFORMER IS INCREASED FROM 5.8% TO 8% HOW MUCH THE EFFICIENCY OF THE TRANSFORMER WILL COME DOWN?
one electromagnet is called
can i use ups power as a raw power for another ups
surge tank, hrc fuse, earthing transformer, firm power objective type
What are the different methodes for calculating the short circuit Current?
HOW TO CALCULATE HV CABLE SIZING?
what is the formula of starting current of 3phase and 1 phase motor???
How to calculate no of EARTH PIT? Describe the formula as per IS standard?
Why in metering Ct for ammeters ct secondary side is grounded for each Ct but not in case of CBCT (Core balance current transformer)..kindly some1 highlights the reason..is it because net flux is zero?
What is the Minimum winding resistance of motors ( small & big)? referance range
how test transfomer(3 phase75kva) by megger
what is the difference between 50 hz freq. and 60 hz freq.? which is better and economic in them ?
Write the current equation in series RLC circuits.
what is the use of piston rings in the engine used for a generator...........
i want bhel placement paper for electrical if anybody having pl send to my id kavitha867@myway.com immediately
