Interested to Buy Any Domain ? << Click Here >> for more details...
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
- 7949 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
What is the relation between frequency and motor rpm?
How to Calculate Transformer Earthing Electrode Rod Size both Body and neutral Earthing ? Any Standard Formula? Please Suggted
what are inductive and capacitive voltage transformers.what are their applications
Block diagram of Power line communication?
Why AC & DC capacitor are use in UPS ??????????????????
what is quality factor in series resonance circuit and calculate the factor of voltage magnification? how it happens?
How much dc volt applied in cathodic protection system?
what is meaning of sympathetic tripping with respect to relays and give the values for current carrying capacities for copper and aluminium cables from 16sq mm to 500sq mm
How many capacitors using in LT panel as per Govt rules?
what is the series parallel connection of capacitors? and how can we use these application in three phase motors for controlling torque?
What is the necessary and sufficient condition for stability.
can you plz send l&t aptitude questions if available its urgent plz plz plz
Why let through energy not considered for ACB breaker while cable sizing?
What is grid collapse? what is the reason for it?
what is the minimum recommended leakage current of an earthed cable connected to the body or skid of an alternator
