Why the power line voltages are multiples of 11(66kv, 220kv...)?

Answer 1

power is supplied using sets of three separate parallel wires that you can see up on most power poles. The very high voltage there is stepped down using a transformer to supply most houses and businesses with a usable lower voltage. The voltage between any one of the three wires to ground in a house is 110 Volts for example to light a light bulb. The voltage between any two wires is 220 Volts and is used for example to power a clothes dryer or kitchen range. Houses do not use all three wires. A machine shop may power a large motor by connecting all three wires (in a delta or Y configuration) to obtain 440 Volts. Therefore the progression of 110, 220, and 440 Volts stems from the use of single, two and three-phase wiring circuits.

Answer 2

yes,these voltage ratings are just a convention we follow. We can produce electricity at any voltage ratings we wish. But multiples of 11 is just a convention.It helps in keeping standards through out the world for human convenience.

Answer 3

I doubt that that is true. 110V is used simply because of history. There's little value in changing it. 220V is useful because you can provide it with a line transformer with a secondary at 220V center tapped. That also provides for two independent 110V lines. Many higher voltages are used for transmission and distribution. There's no particular reason for them to be a multiple of 11. And if one is, just wait a few milliseconds and it will change.

Answer 4

It is due to the historical reason. There is no direct relationship to the number 11.

Answer 5

IT MAKES ITS PEAK VLUE IN ROUND NUMBER LIKE 100 200 300