Why generally the Rating of Transformers are in additions
of 11 i.e. 11 kVA, 22 kVa, 33 kVA, etc........
- 8 Answers
- 16301 Views
- I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / p. h. godavary
Here the question is not correct. Transformer ratings are never in multiples of 11.
It is the Generator voltages that are in multiples of Form factor 1.1(approx.). The voltages are 3300V, 6600V, 11000V. Consequently the normal distribution / transmitting voltages used are 3.3KV, 6.6KV, 11KV, 33KV, 66KV 110KV, .......
Form factor of an alternating current waveform is the ratio of the RMS (Root Mean Square) value to the Average Value of the waveform]. In the case of a sinusoidal wave i.e. , an analogue wave, the form factor is approximately 1.11
| Is This Answer Correct ? | 34 Yes | 3 No |
Answer / ms.gayathri
The rating of transformer is always not in multiples of 11
i.e., the voltages are only in multiples due to the form
factor. Form factor is nothing but the physical size and
shape of a device. Which is approximately 1.11 derived from
the ratio between RMS value and Average value of the sine
waveform(analog).
| Is This Answer Correct ? | 11 Yes | 2 No |
Answer / ali
Dears question is why in addition of 11.... that is 22 ..33
| Is This Answer Correct ? | 8 Yes | 14 No |
Answer / amjad
Due to form factor...
The value of form factor is 1.723
So, thats y the rating of transformers r in multiples of
form factor..
| Is This Answer Correct ? | 8 Yes | 17 No |
Answer / arun
in above of that rating of transformers only will have very
less harmonics...when compare with other rating...
| Is This Answer Correct ? | 5 Yes | 18 No |
Answer / denish konsam, manipur
Because the load on the transformer depends upon the power
factor. If it is given in KW then the load will be fixed
that means that transformer can be used for only one load.
| Is This Answer Correct ? | 6 Yes | 25 No |
Answer / abdul wajid
Basically there are two type of losses in Transformer Iron
losses and core losses Iron losses depend upon voltage and
core losses depends upon current so the total losses
depends upon voltage and current hence transformer ratin is
taken as KVA
| Is This Answer Correct ? | 11 Yes | 50 No |
When charging a 20 MVA , 33kV/6.6kV transformer through regulated (0-6.6 kV or 0-33 kV) source on no load , what will be the maximum current drawn by transformer from source and what sould be the source capacity.
sir plz send some previous year questions of jspl.
why do the core of transformer saturates???
what is power factor?
hello if any one have papers vof hpcl or sail, plz send me
What is maximum AC & DC transmission voltage in India? and where?
HOW TO CALCULATE THE DOMESTIC POWER FACTOR?
difference between isolator and circuit breaker?????
why the value of impedence is taken as %impedence in fault currrent calculation
What sort of protection scheme do you suggest for the protection of a 10 HP motor?
How can get electrical "c" licence.I am complited in Deee.Passing year of 1993.Working in pvt cocern lt Line.Please advise me .Cell no 9994786021
59 Answers Apollo Power, Chemplast, Christy Quality Foods, ITI, Mani Associates, Microtech Engineering, TAFE, Tamil Nadu Power Company, TechSun Energies, Thermax,
In a 3 phase squirrel cage induction motor why does rotor rotate? will 3 phase transformer rotate like a motor if it is placed on bearings and powered up? give reason
-
Civil Engineering (5086) - Mechanical Engineering (4453)
- Electrical Engineering (16638)
- Electronics Communications (3918)
- Chemical Engineering (1095)
- Aeronautical Engineering (239)
- Bio Engineering (96)
- Metallurgy (361)
- Industrial Engineering (259)
- Instrumentation (3014)
- Automobile Engineering (332)
- Mechatronics Engineering (97)
- Marine Engineering (124)
- Power Plant Engineering (172)
- Textile Engineering (575)
- Production Engineering (25)
- Satellite Systems Engineering (106)
- Engineering AllOther (1379)
