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3 comments
Participant

Join Date: Jan 2009
Posts: 4

Why is the Transmission and Dist. Voltage in India in Multiples of 11 only?

01/27/2009 6:07 AM

Hello everybody ,

I wanted to know why is the Transmission / distribution voltage in India in multiples of 11 kv , be it 220 V ,440 V, 3.3 KV, 6.6 KV, 11 KV, 33 KV, 66 KV , 132 KV and so on even though the generation voltage in alternators is 11 kv or 12 KV due to insulation considerations .

It is something to do with the basic electrical engineering ( if yes, kindly explain ) or something concerning history , by those who invented power.

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Power-User

Join Date: May 2007
Location: 39°10' N 91°52' W
Posts: 237
Good Answers: 15
#1

Re: Why is the Transmission and Dist. Voltage in India in Multiples of 11 only?

01/27/2009 6:42 AM

This subject has been covered multiple times here on CR4. Please search the archives for the many answers.

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Guru
Safety - ESD - New Member India - Member - New Member Engineering Fields - Energy Engineering - New Member

Join Date: May 2007
Location: Pune , India
Posts: 823
Good Answers: 39
#2

Re: Why is the Transmission and Dist. Voltage in India in Multiples of 11 only?

01/27/2009 7:36 AM

Hi Gaganandeeep,

I do not think there is any technical reason. There is 400 kV system in India which is not a multiple of 11 . There are 230 volts and 400 volts distribution system prevailing where certain imported machines are designed to operate in that voltage. We in India adopted the British system of electrical distribution which is multiples of 11 .

It is matter of conviction being followed. I have read some where probably in some earlier threads in CR4 itself (I do not remember exactly) that it is because of a misconception that there is voltage drop of 10% iin transmissiioon and to get 100 volts for the consumer, 110 volts distribution was accepted. The system is still not being considered for change as change will call for total replacement of existing equipments.

Please read thee link below

http://en.wikipedia.org/wiki/Electricity_distribution

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Participant

Join Date: Jan 2009
Posts: 4
#3

Re: Why is the Transmission and Dist. Voltage in India in Multiples of 11 only?

01/31/2009 2:26 AM

Thanks Mr. Abraham

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charlie_r (1); Gagandeep Mohey (1); V.I.Abraham (1)

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