Why generally the Rating of Transformers are in additions
of 11 i.e. 11 kVA, 22 kVa, 33 kVA, etc........
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Answer Posted / 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
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