Why Are India's Transmission Voltages in Multiples of 11?

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Discussion Overview

The discussion revolves around the reasoning behind the choice of transmission voltages in India, specifically why these voltages are in multiples of 11, such as 440 V, 1.1 kV, 6.6 kV, 11 kV, 33 kV, 66 kV, 110 kV, 220 kV, and 440 kV. Participants explore various hypotheses and historical contexts related to these voltage levels.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • Some participants suggest that the choice of voltages may relate to a "matricial pattern" similar to resistance values, such as 110 ohms or 44 k ohms.
  • Others question this idea, indicating that resistance values are not constant due to varying transmission line lengths, which complicates the reasoning.
  • A participant notes that while 110, 220, and 440 Vrms are standard values in other parts of the world, the rationale for higher voltage choices in India remains unclear.
  • There is a suggestion that the relationship between transformer output voltage and the factor of 3.33 might be relevant to understanding these voltage levels.
  • One participant mentions a historical context for how transmission line voltages are chosen, referencing a source that indicates there are no world standards and that choices depend on regional history.

Areas of Agreement / Disagreement

Participants express differing views on the reasons behind the voltage choices, with no consensus reached on a definitive explanation. Multiple competing hypotheses are presented without resolution.

Contextual Notes

Some assumptions about the relationship between resistance and transmission voltages are not fully explored, and the discussion lacks clarity on the historical factors influencing voltage selection.

cutiermn
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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
 
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it's look like that they used the same matricial patern of the resistances
 
Truthlover said:
it's look like that they used the same matricial patern of the resistances

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

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.
 
berkeman said:
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.

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
 
Truthlover said:
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

That may not be reason. because resistance is not a constant one because the transmission line lenghts are varying. so u can't say like that
 
cutiermn said:
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
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.
 
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