can anyone enlighten me why there are sooooooo many different dist voltages sooooooo close together. some of em are just a few hundred volts apart ex. 12470 and 13.2 and 13.8 and maybe 14.4...... all of em require different windings to get the same secondary voltages which are standardized 120/240 , 120/208, 277/480 or480. Seems like Transmission voltages are pretty much standardised and Lightning arrestors are made to work on a variety of voltages.
Wouldnt it be cheaper and faster if Xfmr manufacturers didnt hafta constantly swap from one to another to wind one? And neighboring utilities mite could share Transformers in an emergency. I have always wondered about this since in my area the nearest utility other than ours uses 12.470 while we use 13.2and the industrial sector all use 13.8 I admit 34.5 is gettin pretty commonplace nowadays but that usta be transmission ............. Any body know why all these bastard voltages?