# Transmission level voltage

1. Sep 2, 2008

### cutiermn

In india why the transmission level voltages are in multiiples of 11 ?

Ex:
440 V, 1.1kV, 6.6kV, 11kV, 33kV, 66kV, 110kV, 220kV, 440kV

2. Sep 2, 2008

### Truthlover

it's look like that they used the same matricial patern of the resistances

3. Sep 3, 2008

### cutiermn

how u r saying........ what do u mean by matricial patern, ? can u explain please

4. Sep 3, 2008

### Truthlover

what i mean is that it's seem like they used the same valors of those used on the resistance. Like 110 ohms or 44kohms

5. Sep 3, 2008

### Staff: Mentor

No, that wouldn't be the reason. To cutiermn, I don't know why they use those values. Certainly 110, 220, 440Vrms are pretty standard values used in other parts of the world. I don't know the rationale for the higher voltage choices, though.

6. Sep 3, 2008

### cutiermn

whether it has any relation with transformer output voltage........ because generally transformer output equation deals with 3.33 . So it may be the reason. Am i correct

7. Sep 3, 2008

### cutiermn

That may not be reason. because resistance is not a constant one because the transmission line lenghts are varying. so u cant say like that

8. Sep 3, 2008

### dlgoff

That's a good question. I did some searching on how transmission line voltages are chosen. The only thing I could find was a little history on http://en.wikipedia.org/wiki/Electric_power_transmission#History". I guess there are no world standards and depends on the history of the region.

Last edited by a moderator: Apr 23, 2017