Why all the voltage levels are multiples of 11 kV?October 27, 2017 by BahuDWQA Questions › Category: (EE) Power System › Why all the voltage levels are multiples of 11 kV? 0 Vote Up Vote Down Bahu asked 3 years ago 4 Answers 0 Vote Up Vote Down R.Thangaraja answered 3 years ago Typically transmission line voltage drop is 10% of its rated.so when they are designing transformer keeping 10% extra voltage level than they want.for ex :if they want 10kv means voltage will be 11kv.« Previous 1 2