Why is transmission line 11kV, 33kV 66kV Not Is 10kV, 20kV, 30kV ?
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1st Due to form factor 1.1

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2nd we generate the voltage 

4.4*flux*frequency*turn*Kp*kd

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3rd these are line voltage and line voltage increase means current decreases to balance the power in both side of transformer so transmission losses reduces
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This is because, transmission of power at higher voltage, bears minimum losses. The transmission plants wants to transmit power in whole nos. such as 10kv , 20kv, 30kv, 120kv but 10% of its extra voltage is added, to compensate the loss during transmission. Thus having voltage ratings as 11kv, 22kv, 33kv, and 132kv
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10kv plus to compensate losses in olden days 1kv were added and transmitted. Since all equipment used for transmission have a multiple of 11 from olden days, still that is being followed even though the losses are less in modern days because of more efficient equipment. Also for step up and step down of voltages, multiples of 11 is eazy for winding ratios.. i.e. 11kv to 33kv is 1:3.
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