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WHY TRANSFORMERS ARE RATED IN 11KV 22KV 33KV Instead off
10kv 20kv 30kv
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Answer Posted / chandru_williams
1. When an alternator generates voltage, its rms value is
given by 4.4*f*$*t, where $ is value of total flux per
pole. So we can see all the voltages are made inevitably
multiple of this value (1.1, which is the form factor of
ac wave). Also it provides us the best economic
construction of step up and step down transformers.
2. We always use a multiple of 1.11 bcoz for a pure sine
wave the FORM FACTOR is the ratio of rms value of voltage
or
current with the avg. value of voltage or current and for
pure sine wave rms value of current is Imax/root '2' and
avg. value is 2Imax/pie. and which comes out to be 1.11 so
we cant have a combination of other then a multiple of 1.11.
| Is This Answer Correct ? | 26 Yes | 4 No |
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FOR 16/20 MVA 132/33 KV ONAN/ONAF TYPE TRANSFORMER IT IS DESIGNED FOR 16 MVA WITH ONAN CONDITION.IT BECOMES 20 MVA UNDER ONAF CONDITION.LOAD LOSS IS GUARANTEED FOR 65KW AT 20 MVA AND % IMPEDANCE 13.75. PLEASE TELL US AT WHAT LOAD LOSS AND % IMPEDANCE IT SHOULD BE DESIGNED FOR 16 MVA AND WHAT WILL BE ITS EFFICIENCY AT 20 MVA?
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